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1. 6 88599908 annous 908935 3ONYH ANIDNA 71009 SNE 1 duisi n og d d I m 50 A 4 1 58 zu WWE d ae ox 1 1 1041800 sel 98 E 928 zt Si T lt 281 2 08 1 HOIVHZN3O 78 Ana _ o AY Ted NMOC LhHS Tana 9VI0 Tan ouvnoinv 108 4015 554 OL 2 ER sims CS 91 aes g NOILISOd 1 9 vl ps EI 1V03 M MV3915MM 00 i 0953 M OV I dION31CS I gt Ehe 9 8 1518 SE 340 340 SUOLO3INI 1304 1 De gt o5 CUM S As 9 Se 969051081 8090 988 552 19VI y 100 SRR ema uc zi oe lt 538 1 4 MS NOLINOI X oz 53508 2
2. THE CONDITION SET USING THE THE TROUBLE CODE IS SCHEMATIC AS A WERE ANY PROBLEMS REPAIR AS NOT PRESENT LF GUIDE INSPECT THE FOUND NECESSARY WIRING AND FIG 1 CONNECTORS REPAIR AS WIGGLE THE WIRING NOTE THE DRB MUST DID THE WIGGLING NECESSARY WHERE HARNESS FROM THE STILL BE ACTUATING INTERUPT THE FAN WIGGLING CAUSED RELAY TO THE PCM THE FAN RELAY CYCLING FAN CYCLING TO BE INTERUPTED REFER TO GENERAL INFORMATION 3 3 2 FOR ADDITIONAL gt TEST COMPLETED 5 Perform Verification TEST VER 2A Check connectors Clean repair as necessary 0 MOOO mr uUuco CENTER P FOG 158 ONL Ban e SR FOG L TEST TC 14A CONTINUED REPAIRING RADIATOR RELAY CIRCUIT XJ BODY POWER DISTRIBUTION RADIATOR FAN RELAY CONNECTOR FUNCTION FUSED B FUSED IGNITIO 0 MOOO mr oUco N SWITCH OUTPUT RAD FAN RELAY CONTROL RAD FAN RELAY OUTPUT FIG 1 XJ BODY XJ BODY 80b76e94 80b76698 POWERTRAIN CONTROL MODULE GREY CONNECTOR COLOR FUNCTION DB PK RAD FAN RELAY CONTROL RADIATOR FAN RELAY CONNECTOR IN PDC
3. FUNCTION 1 DG OR GENERATOR SOURCE 2 GENERATOR FIELD BK GY B 80b6b36c 1 Perform TEST DTC Before Proceeding START TEST CH 1A CHARGING SYSTEM NO CODE TEST USING DRB READ TROUBLE CODES ARE THERE ANY CHARGING SYSTEM TROUBLE CODES PERFORM DTC TEST BATTERY CONDITION MUST BE VERIFIED PRIOR TO THIS TEST INSPECT THE GENERATOR BELT TENSION AND CONDITION IS THE GENERATOR BELT OK REPAIR AS NECESSARY START ENGINE TURN ON ALL ACCESSORIES AND RAISE THE ENGINE SPEED TO 2000 RPM FOR 30 SECONDS RETURN THE ENGINE TO IDLE SPEED AND READ CODES ARE THERE ANY CHARGING SYSTEM TROUBLE CODES PERFORM DTC TEST TURN ENGINE OFF IGNITION ON USING DRB ACTUATE THE GENERATOR FIELD USING A VOLTMETER BACKPROBE THE GENERATOR FIELD gt DRIVER TERMINAL THE BACK OF THE GENERATOR FIG 1 NOTE THE VOLTAGE SHOULD CYCLE FROM HIGH TO LOW EVERY 1 4 SECOND WHILE MONITORING THE VOLTMETER WIGGLE THE FIELD TERMINALS BACK TO THE PCM AND ASD RELAY WAS THERE ANY INTERRUPTION IN THE HIGH AND LOW VOLTAGE CYCLE REPAIR THE WIRE OR CONNECTOR W
4. PUMP RELAY OUTPUT CIRCUIT FOR A SHORT TO GROUND REPLACE FUSE Check connectors Clean repair as necessary 467 REPLACE THE FUEL PUMP REPLACE FUSE 3 40 OZ TEST 60 REPAIRING RESPONSE CONDITION Perform TEST NS 6A Before Proceeding TJ XJ BODY BATTERY TEMP SENSOR EIS BATTERY FUEL LEVEL CHARGE TEMP THROTTLE POSITION SENSOR 94 2 JTEC 0 40 4 3 40 OZ 5 V2LTIS SECONDARY SANITA PRIMARY TO SENSCR RETURN 80561047 TJ XJ BODY THROTTLE POSITION SENSOR CONNECTOR SENSOR GROUND TP SENSOR SIGNAL 5 VOLT SUPPLY 80061067 60 5 5 NS 6D RECONNECT ALL DISCONNECTED CONNECTORS DISCONNECT THE THROTTLE POSITION SENSOR REPAIRING NO RESPONSE CONDITION Perform TEST NS 6A Before Proceeding CONNECT A VOLTMETER TO THE THROTTLE POSITION SENSOR 5 VOLT SUPPLY CIRCUIT FIG 1 IS THE VOLTAGE BELOW 4 0 VOLTS REPLACE THE POWERTRAIN CONTROL MODULE DISCONNECT THE CAMSHAFT SENSOR READ VOLTMETER IS THE VOLTAGE BELOW 4 0 VOLTS gt REPLACE THE CAMSHAFT SENSOR DISCONNECT THE CRANKSHAFT SENSOR READ VOLTMETER IS THE VOLT
5. 3 DRIVER CIRCUIT FOR A SHORT TO VOLTAGE IF OKAY REPLACE PCM KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS USING AN OHMMETER MEASURE THE INJECTOR 3 DRIVER CIRCUIT TO GROUND FIG 1 2 IS THE RESISTANCE BELOW 5 0 OHMS I 39 REPAIR THE INJECTOR 3 DRIVER CIRCUIT FOR A SHORT TO GROUND WITH AN OHMMETER MEASURE ACROSS THE INJECTOR 3 DRIVER CIRCUIT FIG 3 OR 4 FROM THE POWERTRAIN CONTROL MODULE TO THE INJECTOR CONNECTOR IS THE RESISTANCE BELOW 5 0 OHMS INJECTOR 3 DRIVER CIRCUIT FOR AN OPEN Perform Verification TEST VER 2A Check connectors Clean repair as necessary L REPLACE THE POWERTRAIN CONTROL MODULE MOOO mr oUuco MOOO CC TEST 20 REPAIRING INJECTOR 2 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding CONNECTOR INJECTOR 2 CONNECTOR ASD RELAY OUTPUT DG LG ASD RELAY OUTPUT TJ 2 DG OR ASD RELAY OUTPUT Xd 117 TN INJECTOR 2 DRIVER INJECTOR 2 DRIVER 805676064 80b76e68 INJECTOR 2 CONNECTOR INJECTOR 2 CONNECTOR 1 4 COLOR FUNCTION COLOR FUNCTION 1 DG LG ASD RELAY OUTPUT TJ ASD RELAY OUTPUT 1 DG OR ASD RELAY OUTPUT XJ 1 DG OR ASD RELAY OUTPUT XJ
6. POWERTRAIN CONTROL MODULE 0 MOOO mr uUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 299 REPAIRING OIL PRESSURE SENSOR HIGH EXCEEDED Perform TEST DTC Before Proceeding TJ XJ BODY Name of code Pressure Sensor High Exceeded When monitored With the ignition switch on Set condition The PCM detects voltage on the pressure sensor signal circuit above 4 8 volts Theory of operation The sensor consists of dual ceramic plates that vary resistance with applied pressure The PCM sends 5 0 volt supply to the sensor The change in signal vcltage is preportional to the change in distance between the ceramic plates which varies with applied oil pressure The uses this input to determine pressure and provides this information to the instrument cluster for oil pressure gauge operation The signal voltage is provided at PCM cavity B23 Ground is provided at PCM cavity 4 The 5 volt supply is provided at PCM cavity 17 MOOO mr uUuco Possible cause Sensor signal circuit shorted to voltage Sensor signal circuit open Sensor grcund circuit open gt Failed oil pressure sensor gt Failed PCM Connector terminals Connector wires 80 76 TJ XJ BODY POWERTRAIN CONTROL OIL MODULE PRESSURE SENSOR OIL PRESSURE SENSOR SIGNAL 2 aT 5 VOLT SUPPLY 1 UA SENSOR GRO
7. REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL A TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 2A Check connectors Clean repair as necessary 141 MOOO mr oUuco TEST TC 37A CONTINUED REPAIRING MAP SENSOR VOLTAGE HIGH TJ XJ BODY MAP SENSOR CONNECTOR MOOO CC 5 VOLT SUPPLY DG RD SENSOR SIGNAL SENSOR GROUND 808919155 TEST TC 37A CONTINUED REPAIRING MAP SENSOR VOLTAGE TOO HIGH TEST TC 37A CONTINUED FROM THE PREVIOUS PAGE KEY ON ENGINE OFF DISCONNECT THE MAP SENSOR HARNESS CONNECTOR USING A VOLTMETER MEASURE THE VOLTAGE OF THE MAP SENSOR SIGNAL CIRCUIT AT THE MAP SENSOR HARNESS CONNECTOR FIG 1 IS THE VOLTAGE ABOVE 5 0 VOLTS REPAIR MAP SENSOR SIGNAL FOR A SHORT 2 gt TO VOLTAGE OKAY REPLACE THE PCM KEY OFF USING AN OHMMETER MEASURE THE RESISTANCE OF THE MAP SENSOR SIGNAL CIRCUIT TO THE 5 VOLT SUPPLY CIRCUIT FIG 1 IS RESISTANCE BELOW 5 0 OHMS REPAIR THE MAP YES SENSOR SIGNAL m gt CIRCUIT FOR A SHORT TO THE 5 VOLT SUPPLY CIRCUIT CONNECT A JUMPER WIRE BETWEEN THE SENSOR SIGNAL AND SENSOR GROUND CKTS FIG 1
8. 5 AND IDLE THE ENGINE FOR 1 MINUTE READ CODES gt DOES THE DRB DISPLAY THIS CODE EST 232 REPAIRING INVALID OR WRONG KEY MESSAGE FROM 5 Perform TEST DTC Before Proceeding CONTINUE TEST 232 ON THE NEXT PAGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 INSPECT THE WIRING AND CONNECTORS ASSOCIATED WITH THE PCI BUS CIRCUIT WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES TEST COMPLETE 0 MOOO III CC Perform Verification TEST VER 1A Check connectors Clean repair as necessary 293 TJ BODY 0 MOOO CC M XJ BODY TEST TC 232A REPAIRING INVALID OR WRONG KEY MESSAGE FROM SKIM ANTENNA TRANSPONDER SENTRY KEY IMMOBILIZER MODULE gie FUSE BLOCK FUSED B 4 oe TO PDC 10 AMP FUSE 4 FUSED IGN SWITCH OUTPUT RUN START IGNITION 10 AMP SWITCH WT BK CCD BUS TO OTHER CCD BUS MODULES BK GROUND BK LB 80b6f0cc SENTRY KEY ANTENNA TRANSPONDER IMMOBILIZER CHIP MODULE IN KEY e DB GY PDC FusedB ZA WT BK JUNCTION BLOCK Fused Ign Switch 10 AMP Output Run S
9. AFTER 90 SECONDS IS THE EVAP SOLENOID THE PURGE CYCLE ALLOWING VACUUM TO REPLACE THE PURGE SOLENOID WILL INTERMITTENTLY AT CYCLE THROUGH SOLENOID ALLOW VACUUM TO A STEADY RATE INTERMITTENTLY AT A STEADY RATE NOTE IN THE NEXT KEY OFF ATTEMPT STEPS DO NOT USE TO BLOW AIR DOES THE CANISTER PURGE SOLENOID MORE THAN FIVE THROUGH THE VACUUM gt AND VACUUM LINE gt AND HOSES ARE PSI LINE THAT GOES TO ALLOW AIR TO PASS OK TEST THE CANISTER PASSED NO CONTINUE TEST gt NTC 17B ON THE NEXT PAGE Perform Verification TEST VER 2A Check connectors Clean repair as necessary 373 0 400 4 MOOO mr ocozm oz MOOO mr ocozm oz TEST 17 CONTINUED CHECKING THE EVAPORATIVE EMISSION SYSTEM 80b27d34 TEST 17 CONTINUED CHECKING THE EVAPORATIVE EMISSION SYSTEM TEST NTC 17A REMOVE THE PURGE CONTINUED FROM SOLENOID AND TAP DID ANY FOREIGN REPLACE THE EVAP THE PREVIOUS THE PORTS AGAINST gt MATERIAL FALL OUT gt PURGE SOLENOID PAGE A CLEAN SOLID SURFACE CLEAN OUT THE LINE INSPECT LINE FROM IS THE LINE AND REPLACE THE THE PURGE SOLENOID gt DISCONNECTED gt THE CANISTER RIPPED OR CUT SOLENOID AND CANISTER YES REPAIR T
10. FUNCTION COLOR FUNCTION RD LG FUSED B 2 30 RD WT FUSED BG 4 85 DB WT FUSED IGNITION SWITCH OUTPUT DG PK AUTO SHUTDOWN RELAY OUTPUT 6 86 DE YL 86 RELAY CONTROL 8 87 DB IGNITION SWITCH OUTPUT DB YL AUTO SHUTDOWN RELAY CONTROL RD ASD RELAY OUTPUT 80061109 800604 TJ BODY XJ BODY POWERTRAIN POWERTRAIN CONTROL CONTROL MODULE MODULE BLACK CONNECTOR 4 BLACK CONNECTOR CAV COLOR FUNCTION FUNCTION 2 DB IGNITION SWITCH OUTPUT IGNITION SWITCH OUTPUT 4 BR YL SENSOR GROUND SENSOR GROUND 22 FUSED B i FUSED B A31 BK TN GROUND GROUND A32 BK TN GROUND GROUND 80b76ef5 80aafae7 458 TEST 6 5 5 6 CONTINUED FROM THE PREVIOUS PAGE CONTINUED REPAIRING NO RESPONSE CONDITION KEY OFF DISCONNECT THE AUTO SHUTDOWN RELAY gt USE IN THE FOLLOWING STEP NOTE THE PREVIOUSLY INSPECTED FUSE SHOULD STILL BE REMOVED MEASURE THE RESISTANCE OF THE FUSED B CKT AT PCM CONN TO GND FIG 3 OR 4 gt IS THE RESISTANCE BELOW 5 0 OHMS I REPAIR THE FUSED B CIRCUIT FOR A SHORT TO GROUND REPLACE FUSE USING AN OHMMETER MEASURE THE RESISTANCE OF THER ces ASD RELAY OUTPUT CKT AT THE A
11. REFER GENERAL INFORMATION 3 3 2 FOR ADDITIONAL TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 1A Check connectors Clean repair as necessary 315 lt MA lt 120 lt mN r uozzz lt MA lt 120 ezm o 0 o HPN sc E e D I OH S 2 TEST 5 CONTINUED REPAIRING ROLLING CODE FAILURE TJ BODY XJ BODY ANTENNA TRANSPONDER SENTRY KEY CHIP IMMOBILIZER IN KEY MODULE gie FUSE BLOCK FUSED SI 10 FUSE 4 FUSED IGN SWITCH OUTPUT RUN START IGNITION 10 AMP SWITCH WT BK CCD BUS R TO OTHER CCD BUS MODULES BK GROUND BK LB GROUND 80b6f0cc SENTRY KEY ANTENNA TRANSPONDER IMMOBILIZER MODULE DB GY PDC FusedB ppc WT BK Fused Ign Switch Output Run Start 6 JUNCTION WT BK BLOCK CCD BUS TO Vren OTHER CCD BUS MODULES BK LG Ground BK LG Ground 8066092 Name of code Rolling Code Failure When monitored With the ignition on Set condition The SKIM does not receive an expected EMS status CCD BUS message from the PCM within 3 5 seconds of transmitting a valid key message to the PCM Theory of operation After determining the ignition key is a valid key the SKIM sends a coded
12. MEASURE THE RESISTANCE OF THE IS THE RESISTANCE REPAIR THE SCI SCI TRANSMIT CIRCUIT BELOW 5 0 OHMS TRANSMIT CIRCUIT FROM THE PCM TO THE FOR AN DLC FIG 3 OR 4 CONTINUE TEST gt NS 6B ON THE NEXT PAGE Perform Verification TEST VER 1A Check connectors Clean repair as necessary 463 OAYOMaA gt 10 OZ TEST NS 6B CONTINUED REPAIRING NO RESPONSE CONDITION TJ BODY POWERTRAIN CONTROL MODULE GREY CONNECTOR PK SCI TRANSMIT C28 WT BK CCD BUS C29 LG SCIRECEIVE C30 VI BR CCD BUS OAYOMaA 3 40 OZ DATA LINK CONNECTOR CAV COLOR FUNCTION CCD BUS 4 GROUND GROUND SCI RECEIVE SCI TRANSMIT CCD BUS FUSED B 80aaf128 XJ BODY POWERTRAIN CONTROL MODULE GREY CONNECTOR SCI TRANSMIT WT BK CCD BUS 29 LG BK SCI RECEIVE 30 VT BR CCD BUS DATA LINK CONNECTOR 3 CCD BUS 4 GROUND POWER GROUND SCI RECEIVE SCI TRANSMIT CCD BUS FUSED B 8Caafaf2 TEST NS 6B TEST 5 6 CONTINUED FROM THE PREVIOUS PAGE CONTINUED REPAIRING NO RESPONSE CONDITION MEASURE THE RESISTANCE OF THE SCI RECEIVE CIRCUIT FROM THE PCM TO THE DLC FIG 1 OR 2 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SCI RECEIVE CIRCUIT FOR AN OPEN CONNECT THE DRB TO A FUNCTIONAL DATA LINK ON ANOTHER VE
13. DISCONNECT THE SPEED CONTROL SERVO 4 WAY HARNESS CONNECTOR gt NOTE ENSURE THE BRAKE PEDAL IS NOT DEPRESSED DURING THE FOLLOWING STEPS ENGINE OFF TURN IGNITION ON SPEED CONTROL SWITCH ON USING A VOLTMETER MEASURE THE S C BRAKE SWITCH OUTPUT CIRCUIT AT THE SPEED CONTROL SERVO HARNESS CONNECTOR 1 IS THE VOLTAGE ABOVE 10 0 VOLTS PERFORM TEST TC 15B DISCONNECT THE BRAKE LAMP SWITCH CONNECTOR I 3 USING A VOLTMETER MEASURE THE 12 VOLT SUPPLY CIRCUIT FIG 2 OR 3 IS THE VOLTAGE ABOVE 10 0 VOLTS CONTINUE TEST TC 15A ON NEXT PAGE KEY OFF DISCONNECT THE PCM HARNESS CONNECTOR USING MEASURE THE 12 VOLT SUPPLY CIRCUIT TO GROUND FIG 2 OR 3 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SHORT TO GROUND IN THE 12 VOLT SUPPLY CIRCUIT USING AN OHMMETER MEASURE THE RESISTANCE OF THE 12 VOLT SUPPLY CIRCUIT FIG 4 OR 5 Perform Verification TEST VER 4A gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN IN THE 12 VOLT SUPPLY CERCUIT REPLACE THE POWERTRAIN CONTROL MODULE Check connectors Clean repair as necessary 0 MOOO CC
14. REPAIR THE 1 2 02 SENSOR SIGNAL CIRCUIT FOR A SHORT TO SENSOR GROUND MOOO 22 Perform Verification TEST VER 2A Check connectors Clean repair as necessary 271 TEST 157 REPAIRING INTERMITTENT LOSS OF Perform TEST DTC Before Proceeding Name of code Intermittent Loss of CMP or CKP When Monitored Engine running or cranking Set Condition When the failure counter reaches 96 for 2 consecutive trips Theory of operation A failure counter is incremented whenever the correct number of crank signals is not seen between two cam signals A bad trip is stored when the failure counter reaches 96 Two consecutive bad trips are required to set the fault Possible Causes gt Open or shorted 5 volt supply circuit gt Open sensor ground gt Open or shorted signal circuit gt Excessive crankshaft sensor clearance gt Excessive camshaft sensor clearance gt gt gt gt 0 MOOO 0 0 70 Damaged crankshaft sensor rotating component Damaged camshaft sensor rotating component Failed sensor Failed PCM 80a5574d Tak BODY CRANKSHAFT POWERTRAIN SENSOR AND position CONTROL MAP SENSOR SENSOR MODULE GY BK Sensor Signal OR 5 Volt Supply TN YL CMP Sensor Signal CAMSHAFT POSITION SENSOR BR YL Sensor Ground TO OTHER SENSORS 80a4ef 4 5 5 157
15. KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS USING OHMMETER MEASURE THE INJECTOR 2 DRIVER CIRCUIT TO GROUND FIG 1 2 IS THE RESISTANCE BELOW 5 0 OHMS I 39 REPAIR THE INJECTOR DRIVER CIRCUIT FOR A SHORT TO GROUND WITH AN OHMMETER MEASURE ACROSS THE INJECTOR 2 DRIVER CIRCUIT FIG 3 OR 4 FROM THE POWERTRAIN CONTROL MODULE TO THE INJECTOR CONNECTOR IS THE RESISTANCE BELOW 5 0 OHMS INJECTOR 2 DRIVER CIRCUIT FOR AN OPEN Perform Verification TEST VER 2A Check connectors Clean repair as necessary L REPLACE THE POWERTRAIN CONTROL MODULE MOOO mr oUuco TEST 21 REPAIRING INJECTOR CONTROL CIRCUITS Perform TEST DTC Before Proceeding Name of code Injector Control Circuit When monitored With battery voltage greater than 10 4 volts the auto shutdown relay energized injector pulse width less than 10ms and engine speed less than 3000 rpm Set condition This trouble code takes 64 to 10 0 seconds to set when no inductive kick is sensed 18ms after injector turn off and with no other injectors on Theory of operation Fuel injectors are high impedance solenoids controlled by the PCM Battery voltage is supplied by the ASD relay The injector on time pulse width is controlled
16. USING A TEST LIGHT CONNECTED TO BATTERY PROBE THE GENERATOR FIELD DRIVER CIRCUIT FIG 1 gt DOES THE TEST LIGHT FLASH ON AND OFF PERFORM TEST 6 WITH THE DRB STOP THE GENERATOR FIELD DRIVER ACTUATION TURN IGNITION OFF DISCONNECT THE POWERTRAIN CONTROL MODULE HARNESS CONNECTOR Perform Verification TEST VER 3A gt CONTINUE TEST TC 6A ON THE NEXT PAGE Check connectors Clean repair as necessary 0 MOOO mr oUco 0 MOOO 22 TEST TC 6A CONTINUED REPAIRING CHARGING SYSTEM VOLTAGE HIGH FUNCTION 80b6b36c TJ BODY 80b099df XJ BODY FUNCTION FUSED B GENERATOR FIELD DRIVER AUTO SHUTDOWN RELAY 80b04fdf TEST TC 6A CONTINUED FROM THE PREVIOUS PAGE CONTINUED REPAIRING CHARGING SYSTEM VOLTAGE TOO HIGH USING AN OHMMETER MEASURE GEN FIELD DRIVER CKT FROM PCM HARNESS CONN TO GND FIG 2 OR 3 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE GENERATOR FIELD DRIVER CIRCUIT SHORTED TO GROUND RESISTANCE BETWEEN THE FIELD DRIVER OR GEN SOURCE TERMINALS AND THE GENERATOR CASE FIG 1 L IS THE RESISTANCE BELOW 5 0 OHMS REPAIR
17. T HOCH HOLIMS NOLLISOd ANINA ATOA 5 5 2 L i 0 9 9 8 S TC 5 Fo i 58 99 9 salar 6 RES 8 eb 52 78 1 ml Lo RE EE HOIVUSNSD 13 15 AY Tae ANNO V139 NMOG LNHS dnd una 4 5 705 Lem 4 HalHVIS 3NION3 SdWv1 lt 4015 01 gt HOSS3HdNOO T mE 29 egi HOIIMS gt mim HOLIMS 4 HOUSCH ai m z Tvaad EAM 98 Wy3HLSNMOG i nono AY HH 1 E e 1 HOSS3HdHOO CV Haonsos a lg lala 15709 zm SS BE ung 18 8 8 SI 13240 zT dna 1 2850 i 1 dana a 8 25 js iBvis 5 z SHOLOSPNITANS mous o 2 2 2089 8 851255 4 202 ST 595 1 1 MS NOLLINEI Di TINJA i 5 ERS 984069 1 0ICM31051 1 m Boo z 1421 VL 1 ODE 50 LNSA 7 VS XNA Wann Son 8 WDROVA 29 T E SO i i 1081405 43345 OHINOO 20 03IV34 vaa HOLIMS Fy S8 ege HOSNS 20 ozy 574 2 HOL
18. MOOO gt 2 TEST 15 CONTINUED REPAIRING SPEED CONTROL CIRCUITS TJ BODY BRAKE LAMP SWITCH CONNECTOR C BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT FUSED B BRAKE LAMP SWITCH OUTPUT TJ BODY 80b099e1 BRAKE LAMP SWITCH CONNECTOR FUNCTION BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY 5 BRAKE SWITCH OUTPUT FUSED B 4 BRAKE LAMP SWITCH OUTPUT SPEED CONTROL SERVO CONNECTOR FUNCTION S C VACUUM SOLENOID CONTROL S C VENT SOLENOID CONTROL S C BRAKE SWITCH CUTPUT GROUND 80 09891 C XJ BODY BRAKE LAMP SWITCH CONNECTOR 1 XJ BODY FUNCTION BRAKE SWITCH SENSE GROUND 12 SUPPLY 5 BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED 80b04te6 BRAKE LAMP SWITCH CONNECTOR FUNCTION BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED B 4 SPEED CONTROL SERVO CONNECTOR FUNCTION S C VACUUM SOLENCID CONTROL S C VENT SOLENCID CONTROL S C BRAKE SWITCH OUTPUT GROUND 80 0981C TEST TC 15A CONTINUED REPAIRING SPEED CONTROL CIRCUITS TEST TC 15A CONTINUED FROM USE AN OHMMETER IN THE PREVIOUS THE FOLLOWING PAGE STEPS 5 BRAKE LAMP SWITCH IS THE RESISTANCE TO GROUND IN THE HARNESS CONNECTOR gt BELOW 5 0 OHMS S C BRAKE SWITCH CAVITY 4 AND GROUN
19. THE CONDITION REQUIRED TO SET THE TROUBLE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY WIGGLE THE WIRING HARNESS FROM THE RELAY TO THE POWERTRAIN CONTROL MODULE NOTE THE DRB MUST STILL BE ACTUATING THE A C CLUTCH RELAY DID THE WIGGLING INTERRUPT THE CLICKING REPAIR AS NECESSARY WHERE WIGGLING CAUSED THE CLICKING TO BE INTERRUPTED REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES gt TEST COMPLETE 0 MOOO mr uUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary MOOO CC EST 16 CONTINUED REPAIRING A C CLUTCH RELAY CIRCUIT TJ BODY XJ BODY A C CLUTCH RELAY CONNECTOR cav coron Function FUSED CMP CLUTCH RELAY OUTPUT FUSED IGNITION SWITCH OUTPUT A C CMP CLUTCH RELAY CONTROL POWERTRAIN CONTROL MODULE GREY CONNECTOR COLOR FUNCTION DB OR A C CMP CLUTCH RELAY CONTROL 80b76e91 FIG 1 A C CLUTCH RELAY CONNECTOR IN PDC FUSED B CLUTCH RELAY OUTPUT CMP CLUTCH RELAY CONTROL FUSED IGNITION SWITCH OUTPUT POWERTRAIN CONTROL MODULE
20. CAUTION ENSURE ALL WIRES ARE CLEAR OF THE ENGINE MOVING PARTS gt 5 c IS THE VOLTAGE ABOVE 0 1 VOLT gt REPAIR GENERATOR GROUND FOR HIGH RESISTANCE GENERATOR CASE TO BATTERY SIDE MANUALLY SET ENGINE SPEED TO 1600 RPM WITH DRB READ TARGET CHARGING AND VOLTAGE SENSE y COMPARE THE TWO READINGS y IS THERE MORE THAN 1 0 VOLT DIFFERENCE gt 5 5 ALLOW THE ENGINE TO RETURN TO IDLE SPEED CH ERASE TROUBLE CODES PERFORM TEST CH 1A Perform Verification TEST VER 3A Check connectors Clean repair as necessary 0 MOOO 22 5 REPAIRING CHARGING SYSTEM VOLTAGE LOW Perform TEST TC 5A Before Proceeding TJ XJ BODY GENERATOR FIELD HARNESS CONNECTOR FUNCTION 1 DG OR GENERATOR SOURCE 2 DG GENERATOR FIELD DRIVER POWERTRAIN CONTROL MODULE CONNECTORS 0 MOOO 22 9 10 DG GENERATOR FIELD DRIVER C25 DG OR GENERATOR FIELD SOURCE TJ XJ BODY GENERATOR FIELD HARNESS CONNECTOR 1 DG OR GENERATOR SOURCE 2 GENERATOR FIELD 80560126 TEST 5 Perform TEST TC
21. TEST SC 1B CHECKING THE SPEED CONTROL SYSTEM Perform TEST SC 1A Before Proceeding S C VACUUM SOLENOID CONTROL 5 VENT SOLENOID CONTROL 5 BRAKE SWITCH OUTPUT GROUND 806041604 5 1 5 5 5 CHECKING THE SPEED CONTROL SYSTEM Perform TEST SC 1A Before Proceeding KEY OFF DISCONNECT THE SPEED CONTROL SERVO CONNECTOR IS ANY TERMINAL DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY USING AN OHMMETER MEASURE RESISTANCE OF THE GROUND CIRCUIT TO GROUND FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS GROUND CIRCUIT IGNITION ON WITH THE DRB ACTUATE THE S C VENT SOLENOID USING A VOLTMETER MEASURE THE S C BRAKE SWITCH OUTPUT CKT AT S C CONNECTOR FIG 1 IS THE VOLTAGE ABOVE 10 0 VOLTS PERFORM TEST SC 1D RECONNECT THE SPEED CONTROL SERVO CONNECTOR START ENGINE ALLOW TO IDLE 1 MINUTE TURN ENGINE OFF IGNITION ON WITH THE DRB ACTUATE THE SPEED CONTROL SERVO SOLENOIDS DOES THE THROTTLE OPEN AND CLOSE PERFORM TEST SC 5A KEY OFF DISCONNECT THE VACUUM SUPPLY TO THE SPEED CONTROL SERVO ATTACH A VACUUM GAUGE TO THE DISCONNECTED HOSE START ENGINE DOES THE VACUUM GAUG
22. IS THE VOLTAGE ABOVE 4 5 VOLTS REPAIR THE OPEN IN THE TP SENSOR SIGNAL CIRCIUT KEY OFF RECONNECT THE TP SENSOR HARNESS CONNECTOR KEY ON USING THE DRB READ TP SENSOR VOLTAGE THROTTLE MUST BE AGAINST THROTTLE STOP IS THE VOLTAGE 92 OR LESS WITH THE THROTTLE CLOSED REPLACE THE THROTTLE POSITION SENSOR WHILE MONITORING THE DRB SLOWLY OPEN AND CLOSE THE THROTTLE IS THE VOLTAGE CHANGE SMOOTH REPLACE THE THROTTLE POSITION SENSOR STOP MOVING LINKAGE WIGGLE THROTTLE POSITION SENSOR CONNECTOR AND HARNESS MONITOR THE DRB DISPLAY WAS THERE ANY CHANGE IN THROTTLE POSITION SENSOR VOLTAGE WHEN WIGGLED REPAIR THE HARNESS OR CONNECTOR THAT CAUSED THE VOLTAGE CHANGE START ENGINE WIGGLE THROTTLE POSITION SENSOR CONNECTORS AND HARNESS MONITOR ENGINE RPM WAS THERE ANY CHANGE IN ENGINE RPM WHEN WIGGLED REPAIR THE HARNESS OR CONNECTOR THAT CAUSED THE ENGINE RPM TO CHANGE USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS Perform Verification TEST VER 2A Check connectors Clean repair as necessary 355 WERE PROBLEMS FOUND REPAIR AS NECESSARY TP SENSOR OPERATING NORMALLY T
23. Perform Verification TEST VER 1A gt IS THE SECONDARY RESISTANCE BETWEEN 11 300 15 300 OHMS 3 REPLACE THE IGNITION COIL 439 gt 5 NS 1A THE NEXT PAGE Check connectors Clean repair as necessary gt 10 OZ TEST 1 CONTINUED QUALIFYING NO START CONDITION TJ BODY POWERTRAIN CONTROL MODULE BLACK CONNECTOR 0 40 4 gt 10 OZ COLOR FUNCTION IGNTION COIL DRIVER IGNITION COIL CONNECTOR 80b76ec0 XJ BODY IGNITION COIL CONNECTOR 2 1 GY IGNITION COIL DRIVER 2 DG OR ASD RELAY OUTPUT POWERTRAIN CONTROL MODULE BLACK CONNECTOR COLOR FUNCTION IGNITION COIL DRIVER FIG 2 80b118ae 1 5 5 1 THE PREVIOUS PAGE DISCONNECT THE PCM HARNESS CONNECTOR CONTINUED QUALIFYING A NO START CONDITION USING AN OHMMETER MEASURE THE RESISTANCE OF THE IGNITION COIL DRIVER CIRCUIT AT THE PCM CONNECTOR TO GROUND FIG 1 OR 2 IS THE RESISTANCE BELOW 5 0 OHMS YES REPAIR THE IGNITION COIL DRIVER CIRCUIT FOR A SHORT TO GROUND USING AN OHMMETER MEASURE THE RESISTANCE OF THE COIL DRIVER CIRCUIT FROM THE IGNITION COIL TO THE PCM CONNECTOR FIG 1 OR 2 IS THE RESISTANCE ABOVE 5 0 OHMS REPAIR THE
24. REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO mr oUco Perform Verification TEST VER 2A Check connectors Clean repair as necessary Perform TEST DTC Before Proceeding TJ BODY POWERTRAIN CONTROL MODULE EVAP SOLENOID PK BK EVAP SOLENOID CONTROL RD LG FUSED IGNITION SWITCH OUTPUT TO IGNITION SWITCH MOOO mr 80d09ab9 TJ BODY EVAPORATIVE SOLENOID CONNECTOR cav FUNCTION 1 PK BK SOLENOID CONTROL 2 RD LG FUSED IGNITION SWITCH OUTPUT BOb6f0e2 TJ BODY EVAPORATIVE SOLENOID CONNECTOR coLon EVAP SOLENOID CONTROL FUSED IGNITION SWITCH OUTPUT POWERTRAIN CONTROL MODULE GREY CONNECTOR COLOR FUNCTION C20 PK BK EVAP SOLENOID CONTROL 80b76e92 TEST TC 18A REPAIRING EVAP PURGE SOLENOID CIRCUIT XJ BODY POWERTRAIN CONTROL MODULE XJ BODY 1 COLOR SOLENOID Evap Solenoid Control WT Fused Ignition Switch Output TO IGNITION SWITCH 15 AMP 80061045 EVAPORATIVE SOLENOID CONNECTOR FUNCTION 1 PK BK 2 WT XJ BODY EVAP SOLENOID CONTROL FUSE IGNITION SWITCH OUTPUT 2 EVAPORATIVE SOLENOID CONNECTOR 2 CMV FUNCTION 1 PK BK EVAP SOLENOID CONTR 2 WT FUSED IGNITION SWITCH OUTPUT gt gt POWERTRAIN OL 0 CONTROL MODULE GREY
25. SEE FIGURE 1 FOR TROUBLE CODE INFORMATION USING THE DRB CHECK THE DISTRIBUTOR POSITION WITH SET SYNC SIGNAL UNDER MISC FUNCTIONS EST TC 157A REPAIRING INTERMITTENT LOSS OF CMP OR CKP Perform TEST DTC Before Proceeding IS THE DISTRIBUTOR POSITION IN RANGE SET DISTRIBUTOR POSITION WITH DRB USING STEPS GIVEN IN TEST NTC 13A NOTE CMP OR CKP SIGNAL LOSS CAN BE DETECTED BY A RPM CHANGE TROUBLE CODE OR PATTERN ON THE OSCILLOSCOPE DO YOU WANT TO DIAGNOSE CMP OR CKP SIGNAL LOSS WITH AN OSCILLOSCOPE PERFORM TEST TC 157B YES AT THE CMP SENSOR BACKPROBE THE SENSOR SIGNAL CKT WITH THE VOLTAGE LEAD START THE ENGINE AND OBSERVE THE CMP SENSOR VOLTAGE PATTERN ON THE SCOPE ARE THERE ANY CAMSHAFT POSITION SENSOR SIGNALS MISSING CONTINUE TEST L 3 157 ON THE NEXT PAGE KEY OFF DISCONNECT THE CMP SENSOR CONNECTOR IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY DISCONNECT THE PCM HARNESS CONNECTOR IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY PERFORM TEST gt XC 1 579 MOOO CC M Perform Verification
26. WITH THE ASD RELAY STILL ACTUATED USING A VOLTMETER MEASURE THE INJECTOR DRIVER CIRCUIT BETWEEN THE INJECTOR HARNESS CONNECTOR AND GROUND FIG 1 2 IS THE VOLTAGE ABOVE 1 0 VOLTS 1 DRIVER CIRCUIT FOR A SHORT TO VOLTAGE IF OKAY REPLACE PCM KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS USING OHMMETER MEASURE THE INJECTOR 1 DRIVER CIRCUIT TO GROUND FIG 1 OR 2 IS THE RESISTANCE BELOW 5 0 OHMS I 39 REPAIR THE INJECTOR 1 DRIVER CIRCUIT FOR A SHORT TO GROUND WITH AN OHMMETER MEASURE ACROSS THE INJECTOR 1 DRIVER CIRCUIT FIG 3 OR 4 FROM THE POWERTRAIN CONTROL MODULE TO THE INJECTOR CONNECTOR IS THE RESISTANCE BELOW 5 0 OHMS INJECTOR 1 DRIVER CIRCUIT FOR AN OPEN Perform Verification TEST VER 2A Check connectors Clean repair as necessary L REPLACE THE POWERTRAIN CONTROL MODULE MOOO mr oUuco TEST 25 REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS Perform TEST DTC Before Proceeding TJ XJ BODY POWERTRAIN CONTROL MODULE EEN IAC MOTOR DRIVER 4 20 BR WT IAC MOTOR DRIVER 3 E YL BK s IAC MOTOR DRIVER 2 B m GY RD A19 MOTOR DRIVER 1 IDLE AIR CONTROL
27. KEY OFF DISCONNECT THE PCM HARNESS CONNECTOR USING AN OHMMETER PROBE CAVITY A31 AT THE PCM CONNECTOR FIG 1 2 IS THE RESISTANCE BELOW 5 0 OHMS WITH AN OHMMETER PROBE CAVITY A32 AT THE PCM CONNECTOR FIG 1 OR 2 IS THE RESISTANCE BELOW 5 0 OHMS gt REPAIR THE GROUND CIRCUIT FOR AN OPEN USING A VOLTMETER MEASURE CAVITY A22 AT THE PCM CONNECTOR FIG 1 OR 2 gt IS THE VOLTAGE ABOVE 10 0 VOLTS REPAIR THE FUSED B CIRCUIT FOR AN OPEN gt USING A VOLTMETER MEASURE CAVITY A2 AT THE PCM CONNECTOR FIG 1 OR 2 IS THE VOLTAGE ABOVE 10 0 VOLTS REPAIR THE FUSED IGNITION SWITCH OUTPUT CIRCUIT FOR AN POWERTRAIN CONTROL MODULE CONNECTOR PCM POWER AND GROUND CIRCUITS gt NORMAL TEST PASSED 0 400 4 MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 347 MOOO mr ocozm oz TEST 4 CHECKING THE ENGINE VACUUM Perform TEST NTC 1A Before Proceeding NORMAL READING RANGE AT IDLE SEA LEVEL 0920605 TEST 4 CHECKING THE ENGINE VACUUM Perform T
28. MEASURE THE RESISTANCE BETWEEN THE 2 DRIVER AND 3 4 DRIVERS 15 5 5 BELOW 5 0 OHMS DRIVERS REPAIR THE IAC DRIVER CIRCUITS SHORTED TOGETHER USING RESISTANCE BETWEEN THE 3 DRIVER AND 4 DRIVER 15 5 5 BELOW 5 0 OHMS REPAIR THE IAC DRIVER CIRCUITS SHORTED TOGETHER REPLACE THE IDLE AIR CONTROL MOTOR 0 MOOO CC M Perform Verification TEST VER 2A Check connectors Clean repair as necessary TEST 25 REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS Perform TEST TC 25A Before Proceeding TJ XJ BODY POWERTRAIN CONTROL MODULE BLACK CONNECTOR IAC 3 DRIVER IAC 2 DRIVER IAG 4 DRIVER IAC 1 DRIVER MOOO mr uUuco IDLE AIR CONTROL MOTOR CONNECTOR IAC 1 DRIVER IAC 2 DRIVER IAC 3 DRIVER IAC 4 DRIVER 80689863 POWERTRAIN CONTROL MODULE VB IAC MOTOR DRIVER 4 20 BR WT IAC MOTOR DRIVER 3 E YL BK 8 IAC MOTOR DRIVER 2 GY RD 19 IAC MOTOR DRIVER 1 IDLE AIR CONTROL MOTOR 80b6f0d8 TEST 25 REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS Perform TEST TC 25A Before Proceeding KEY OFF START TEST DISCONNECT THE IS ANY TERMINAL REPAIR AS TC 25B POWE
29. 02 VALVE FUEL TANK ELECTRICAL CONNECTOR ROLLOVER VALVE 0 43851 4 6 Relays TJ BODY POWER DISTRIBUTION CENTER PDC RELAY SECTION A C CLUTCH RELAY FRONT CAV 6 30 COLOR FUNCTION RD GY FUSED B 7 87 DB BK A C CMP CLUTCH RELAY OUTPUT 8 86 FUSED IGNITION SWITCH OUTPUT 10 85 DB OR A C CLUTCH RELAY CONTROL 80567108 19 XJ BODY FUEL PUMP MODULE CONNECTOR FUNCTION 80 16 XJ BODY 7 ROLLOVER __ VALVE RETAINER CLAMP FUEL SUPPLY TUBE EVAP CANISTER VENT LINE LOCKNUT a MODULE FUEL FILTER FUEL PRESSURE REGULATOR ALIGNMENT ARROW PIGTAIL HARNESS 80aac284 XJ BODY POWER DISTRIBUTION CENTER A C CLUTCH RELAY rm CONNECTOR COLOR FUNCTION 1 80 RD BK FUSED B 2 87 DB BK CLUTCH RELAY OUTPUT 3 85 DB OR A C CLUTCH RELAY CONTROL 5 86 DB WT FUSED IGNITION SWITCH OUTPUT 80b6f de gt 2 0 4 520 0 2 gt gt 20 4 5200 12 4 6 Relays Continued TJ BO
30. 5 5 BELOW 5 0 OHMS REPAIR THE FUEL LEVEL SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND MEASURE THE RESISTANCE BETWEEN THE FUEL LEVEL SENSOR SIGNAL CIRCUIT AND THE SENSOR GROUND 1 2 gt IS THE RESISTANCE BELOW 5 0 OHMS YES L 3 REPAIR THE FUEL LEVEL SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE SENSOR GROUND CIRCUIT REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO mr oUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 247 MOOO mr ocom TEST TC 150A REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO HIGH Perform TEST DTC Before Proceeding TJ BODY 2B DGANT TO FLS D IGN FUEL PUMP IGNITION o OUTPUT RELAY QUTPUT SWITCH POWERTRAIN CONTROL MODULE FUEL PUMP RELAY BR PUMP 85 RELAY CONTROL FUEL LEVEL SENSOR SIGNAL BATTERY C26 BR YL SENSOR GROUND 80b6f0ce XJ BODY ca Fused Ign IGNITION 6 Sw SWITCH DG WT Fuel Pump Relay Output FUEL PUMP RELAY POWERTRAIN CONTROL MODULE BR Fuel Pump Relay Control DBILG Fuel Level Sensor Signal BR YL Sensor Ground 8006044 TJ XJ BODY Name of code Fuel Level Sending Unit Volts Too High When monitored Ignition on and battery voltage above 10 4 volts S
31. 80b76ec7 FIG 6 5 101 CONTINUED FROM THE PREVIOUS PAGE DISCONNECT THE FUEL PUMP RELAY USING A VOLTMETER MEASURE THE FUSED IGN SWITCH OUTPUT CKT AT RELAY CONN FIG 1 OR 2 EST TC 101A CONTINUED REPAIRING FUEL PUMP SYSTEM RELAY CONTROL CIRCUIT gt IS THE VOLTAGE ABOVE 10 0 VOLTS REPAIR THE FUSED IGN SWITCH OUTPUT CIRCUIT FOR AN OPEN USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE RESISTANCE BETWEEN TERMINALS 85 AND 86 OF THE FUEL PUMP RELAY FIG 3 OR 4 gt IS THE RESISTANCE BETWEEN 70 TO 90 OHMS REPLACE FUEL PUMP RELAY KEY OFF DISCONNECT THE PCM HARNESS CONNECTOR USING AN MEASURE THE FUEL PUMP RELAY CONTROL CKT AT PCM TO GND FIG 5 OR 6 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE FUEL PUMP RELAY CONTROL CIRCUIT FOR SHORT TO GROUND USING AN OHMMETER MEASURE THE RESISTANCE OF THE FUEL PUMP RELAY CONTROL CIRCUIT gt BETWEEN THE PCM AND THE FUEL PUMP RELAY FIG 5 OR 6 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE FUEL PUMP RELAY CONTROL CIRCUIT FOR AN OPEN REPLACE THE POWERTRAIN CONTROL MODULE
32. Sensor Signal OR 5 Volt Supply TN YL CMP Sensor Signal CAMSHAFT POSITION SENSOR BR YL Sensor Ground TO OTHER SENSORS 80adeff4 TEST 157 CONTINUED REPAIRING INTERMITTENT LOSS OF TEST TC 157A AT PCM BACKPROBE CONTINUED FROM CKP SENSOR SIGNAL THE PREVIOUS CKT WITH SCOPE S PAGE VOLTAGE MEASUREMENT LEAD V WHILE OBSERVING WERE ANY CKP NOTE WHERE THE SCOPE PATTERN SENSOR SIGNALS WIGGLING THE WIRES WIGGLE CKP SENSOR MISSING WHEN THE gt CAUSED MISSING CIRCUIT FROM WIGGLE TEST WAS CKP SENSOR SIGNAL SENSOR TO PCM CONDUCTED NO THE CONDITION REPAIR THE REQUIRED TO SET CAMSHAFT AND THE TROUBLE CODE CRANKSHAFT WIRE IS NOT PRESENT HARNESS AS FIG 1 NECESSARY REFER TO GENERAL INFO 3 3 2 FOR INFORMATION ON TEST COMPLETE INACTIVE TROUBLE CODES Perform Verification TEST VER 2A Check connectors Clean repair as necessary 277 0 MOOO mr uUco TEST TC 157B REPAIRING INTERMITTENT LOSS OF OR Perform TEST TC 157A Before Proceeding Name of code Intermittent Loss of CMP or CKP When Monitored Engine running or cranking Set Condition When the failure counter reaches 96 for 2 consecutive trips Theory of operation A failure counter is incremented whenever the correct number of crank signals is not seen between two cam signals A
33. 22 MAP SENSOR BR YL Sensor Ground DG RD Map Sensor Signal REPAIRING MAP SENSOR VOLTAGE TOO LOW NO 5 VOLTS TO MAP SENSOR POWERTHRAIN CONTROL MODULE GROUND TO OTHER SENSORS TO TP SENSOR Name of code MAP Sensor Voltage Too Low When monitored With engine rpm above 416 but less than 3520 and the TP sensor voltage less than 1 13 volt and battery voltage greater than 10 4 volts Set condition The MAP sensor signal voltage is below 1 volt for 2 0 seconds with engine running Theory of operation This sensor measures manifold absolute pressure and ambient barometric pressure within the manifold It provides a 0 to 5 volt signal to PCM The MAP sensor puts out a low voltage signal 0 5 to 1 8 volts at idle when the manifold vacuum is high and a higher voltage signal 3 9 to 4 8 volts at deep throttle when the manifold vacuum is low The MAP receives a 5 volt supply from PCM voltage may vary from 4 8 to 5 1 volts The sensor ground is provided by PCM Possible causes Signal circuit shorted to ground Failed sensor gt Failed PCM 80aa0f80 134 80 44262 Name of code No 5 Volts to MAP Sensor When monitored With the ignition off and battery voltage greater than 10 4 volts Set condition The MAP sensor signal voltage goes below 2 85 volts with key off for 5 0 seconds Theory of operation This sensor measures manifold absolute pressure and ambient barometric pressure within
34. SENSOR GROUND CIRCUIT KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE RESISTANCE OF THE ECT SENSOR SIGNAL CIRCUIT FIG 3 OR 4 BETWEEN THE PCM AND THE ECT SENSOR LS IS THE RESISTANCE BELOW 5 0 OHMS POWERTRAIN CONTROL MODULE Perform Verification TEST VER 2A Check connectors Clean repair as necessary 123 L REPAIR THE ECT SENSOR SIGNAL CIRCUIT FOR AN OPEN MOOO mr oUuco TEST 35 REPAIRING NO VEHICLE SPEED SENSOR SIGNAL Perform TEST DTC Before Proceeding TJ XJ BODY POWERTRAIN CONTROL MODULE VT OR 5 VOLT SUPPLY BR YL SENSOR GROUND SENSOR WT OR i VEHICLE SPEED TO OTHER SENSOR SIGNAL SENSORS MOOO CC 80604639 Name of Code No Vehicle Speed Sensor Signal When monitored With engine temperature greater than 194 F MAP approximately 350 torr MAP vacuum 15 to 16 and engine speed between 1400 and 3000 RPM Set condition No signal from the vehicle speed sensor for more than 15 seconds on two 2 consecutive trips Theory of operation The vehicle speed sensor is hall effect type sensor used to detect the vehicle speed The PCM calculates the vehicle speed based on the VSS signal The PCM supplies 5 volts
35. USING A VOLTMETER PROBE FUSED IGN SWITCH OUTPUT CIRCUIT FIG 1 OR 2 gt IS THE VOLTAGE ABOVE 10 0 VOLTS gt REPAIR THE OPEN FUSED IGN SWITCH OUTPUT CIRCUIT BETWEEN PCM amp IGNITION SWITCH CONTINUE TEST gt NS 6A ON THE NEXT PAGE 3 40 OZ Perform Verification TEST VER 1A Check connectors Clean repair as necessary 455 0 40 4 gt 10 OZ TEST 6 CONTINUED REPAIRING NO RESPONSE CONDITION TJ BODY XJ BODY POWERTRAIN CONTROL MODULE POWERTRAIN CONTROL MODULE TO IGN gt SWITCH START RUN TO IGN SWITCH START RUN 2 IGNITION SWITCH OUTPUT 2 IGNITION SWITCH OUTPUT BR YL SENSOR GROUND SENSORS BR YL SENSOR GROUND SENSORS RD DG BK IN PDC 80 IN B To gt 925 80b76ef3 80b76ef4 TJ BODY XJ BODY POWERTRAIN POWERTRAIN CONTROL MODULE BLACK CONNECTOR CAV COLOR FUNCTION 2 DB A4 BR YL A22 RD WT A31 BK TN A32 BK TN IGNITION SWITCH OUTPUT SENSOR GROUND FUSED B GROUND GROUND 80b76ef5 456 CONTROL MODULE BLACK CONNECTOR FUNCTION SENSOR GROUND FUSED B GROUND GROUND IGNITION SWITCH OUTPUT 80aatae7 TEST 6 5 5 6 CONTINUED FROM THE PREVIOUS PAGE CONTINUED REPAIRING NO RESPONSE
36. KEY OFF DISCONNECT THE PCM HARNESS CONNECTOR CONTINUED CHECKING THE SPEED CONTROL SYSTEM USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE RESISTANCE OF THE gt 12 VOLT SUPPLY PCM TO BRAKE SWITCH FIG 1 2 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN 12 VOLT SUPPLY CIRCUIT PCM TO BRAKE SWITCH USING AN OHMMETER MEASURE THE 12 VOLT SUPPLY CIRCUIT TO GROUND FIG 3 OR 4 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SHORT TO GROUND IN THE 12 VOLT SUPPLY CIRCUIT REPLACE THE POWERTRAIN CONTROL MODULE rOx34zoo Perform Verification TEST VER 4A Check connectors Clean repair as necessary 411 TEST 5 2 CHECKING SPEED CONTROL ON OFF SWITCH Perform TEST SC 1A Before Proceeding TJ XJ BODY POWERTRAIN CONTROL MODULE BR YL SENSOR GROUND RD LG SPEED CONTROL SW SIGNAL YL RD 12 VOLT SUPPLY WT PK BRAKE SWITCH SENSE N RD SERVO SOLENOIDS S C VAC SOL CONTROL DB RD LG RD S C BRAKE S C VENT SOL CONTROL SW OUTPUT TT SWITCH 80b099e0 TJ XJ BODY SPEED CONTROL SWITCH CONNECTOR RD LG SPEED CONTROL SIGNAL 80ab3724 TJ XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS CAV COLOR FUNCTION A
37. REPAIR THE OPEN POWER STEERING PRESSURE SWITCH CIRCUIT MEASURE THE P S PRESSURE SWITCH CIRCUIT AT THE P S SWITCH TO GROUND FIG 1 WAS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE POWER STEERING PRESSURE SWITCH CIRCUIT FOR A SHORT TO GROUND REPLACE POWERTRAIN CONTROL MODULE 0 MOOO CC Perform Verification TEST VER 2A Check connectors Clean repair as necessary 215 TEST 115 CONTINUED REPAIRING POWER STEERING SWITCH FAILURE ERTRAIN DULE STFFERING PSESSJRE SWITCH Power Steering 4 Pressure Switch Sense 0 MOOO mr uUuco 4070103 2 51 TJ XJ POWER STEERING SWITCH CONNECTOR COLOR FUNCTION 1 BK GROUND 2 DB BR POWER STEERING PRESSURE SW SENSE 2 5L TJ XJ 80076127 TEST 115 CONTINUED REPAIRING POWER STEERING SWITCH FAILURE TEST TC 115A CONTINUED FROM THE PREVIOUS PAGE Perform Verification TEST VER 2A Check connectors Clean repair as necessary 217 USING AN OHMMETER MEASURE THE GROUND CKT AT PS PRESSURE SWITCH CONNECTOR FIG 1 IS RES BELOW 5 STANCE 0 OHMS REPAIR OPEN GROUND CIRCUIT REPLACE POWER STEERING PRESSURE SWITCH MOOO mr uUuco
38. USE AN O THE FO STEP HMMETER IN LLOWING MEASURE THE FUEL LEVEL SENSOR SIGNAL CIRCUIT FIG 1 OR 2 BETWEEN THE PCM AND THE FUEL PUMP MODULE IS THE RESISTANCE BELOW 5 0 OHMS REPLACE THE POWERTRAIN CONTROL MODULE Perform Verification TEST VER 2A 253 REPAIR THE FUEL LEVEL SENSOR SIGNAL CIRCUIT FOR AN OPEN Check connectors Clean repair as necessary MOOO mr oUco MOOO mr ocom TEST 151 REPAIRING FUEL LEVEL SENDING UNIT NO CHANGE OVER TIME Perform TEST DTC Before Proceeding TJ BODY XJ BODY TJ XJ BODY POWERTRAIN 2B DGANT TO FLS D IGN FUEL PUMP IGNITION o OUTPUT RELAY QUTPUT SWITCH CONTROL MODULE FUEL PUMP RELAY BR PUMP 85 RELAY CONTROL DRAG FUEL LEVEL SENSOR SIGNAL BATTERY D SENSOR GROUND 80b6f0ce DB WT TO Fused Ign IGNITION Sw Output SWITCH DG WT Fuel Pump Relay Output FUEL PUMP RELAY POWERTRAIN CONTROL MODULE BR Fuel Pump Relay Control DB LG Fuel Level Sensor Signal BR YL Sensor Ground 8006044 Name of code Fuel Level Sending Unit No Change Over Time When monitored Ignition on vehicle running at normal operating temperature Set condition The PCM sees the fuel level between 9 4 and 9 9 for 4 5 minutes Theory of opera
39. WITH THE DRB DISPLAY THE VIN THAT IS PROGRAMMED IN THE PCM gt IS THE CORRECT VIN PROGRAMMED IN THE PCM gt REPLACE PCM AND PROGRAM CORRECT VIN INTO PCM AND RETEST KEY OFF REPLACE THE POWERTRAIN CONTROL MODULE CLEAR ALL CODES ATTEMPT TO START AND IDLE THE ENGINE USING THE DRB READ PCM TROUBLE CODES DOES THE DRB DISPLAY THIS CODE REPLACE THE SKIM TEST COMPLETE 0 MOOO 22 Perform Verification TEST VER 1A Check connectors Clean repair as necessary 295 REPAIRING OIL PRESSURE SENSOR LOW EXCEEDED Perform TEST DTC Before Proceeding TJ XJ BODY Name of code Oil Pressure Sensor Low Exceeded When monitored With the ignition switch on Set condition The PCM detects voltage on the ail pressure sensor signal circuit below 0 1 volts Theory of operation The sensor consists of dual ceramic plates that vary resistance with applied oil pressure The PCM sends a 5 0 volt supply to the sensor The change in signal voltage is proportional to the change in distance between the ceramic plates which varies with applied cil pressure The PCM uses this input to determine oil pressure and provides this information to the instrument cluster for oil pressure gauge operation The signal voltage is provided at PC
40. REPAIR AS NECESSARY ROAD TEST VEHICLE WHILE MONITORING TCC STATE AND ENGINE RPM WITH DRB DOES THE ENGINE RPM DROP WHEN THE TCC STATE GOES TO ON I REMOVE OIL PAN AND CHECK FOR DEBRIS OR BURNT OIL CONTINUE TEST TC 148A ON THE NEXT PAGE DOES THE PAN CONTAIN EXCESSIVE DEBRIS AND OR IS THE FLUID BURNT REPAIR INTERNAL TRANSMISSION PROBLEM REPLACE TCC SOLENOID USING THE DRB CLEAR CODES ROAD TEST VEHICLE WHILE MONITORING THROTTLE ANGLE USING THE DRB ACCELERATE VEHICLE TO 60 MPH MAINTAINING A CONSTANT 20 DEGREE THROTTLE ANGLE REPEAT THE ACCELRATION TEST 4 TIMES USING THE DRB READ DTC S gt DID THE CODE RETURN DURING THE ROAD TEST TEST COMPLETE REPLACE TORQUE CONVERTER 0 MOOO mr oUco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 241 0 MOOO 0 70 TEST 148 CONTINUED REPAIRING TORQUE CONVERTER CLUTCH RPM DROP LOCK UP TJ XJ BODY WITH 3 SPD AUTO TRANS NOTES 242 TEST 148 CONTINUED REPAIRING TORQUE CONVERTER CLUTCH RPM DROP LOCK UP TJ XJ BODY WITH 3 SPD AUTO TRANS TEST 148 CONTINUED FROM THE PREVIO
41. TURN IGNITION OFF REMOVE THE IDLE AIR CONTROL MOTOR FROM THE THROTTLE BODY RECONNECT IDLE AIR CONTROL MOTOR ELECTRICAL CONNECTOR WITH DRB ACTUATE THE IDLE AIR CONTROL MOTOR FIG 1 CONTINUED CHECKING THE IDLE AIR CONTROL MOTOR gt 15 CONTROL MOVING I IDLE AIR OTOR TIP AND OUT CONTINUE TEST m NS 7A ON THE NEXT PAGE INSPECT THROTTLE BODY FOR A RESTRICTION OR CARBON BUILD UP Perform Verification TEST VER 1A 5 THE BODY RESTRI THROTTLE FREE OF CTIONS CLEAN OR REPLACE THROTTLE BODY 475 PERFORM TEST gt 5 Check connectors Clean repair as necessary gt 10 OZ TEST 7 CONTINUED CHECKING THE IDLE AIR CONTROL MOTOR TJ XJ BODY 0 40 4 gt 10 OZ IDLE AIR CONTROL MOTOR CONNECTOR IDLE AIR CONTROL 1 DRIVER IDLE AIR CONTROL 2 DRIVER IDLE AIR CONTROL 3 DRIVER IDLE AIR CONTROL 4 DRIVER 80589862 TEST 5 7 TEST NS 7A CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE POWERTRAIN CONTROL MODULE THE FOLLOWING STEPS ARE CHECKING FOR A SHORT BETWEEN THE DRIVER CIRCUITS CONTINUED CHECKING THE IDLE AIR CONTROL MOTOR USING AN OHMMETER MEASURE THE RESISTANCE BETWEEN THE IAC 1 DRIVER AND 2 3 4 DRIVERS
42. 5 226 EST 226 REPAIRING CCD BUS MESSAGE RECEIVED FROM SKIM Perform TEST DTC Before Proceeding ATTEMPT TO START THE ENGINE READ CODES DOES DISPLAY THE DRB THIS CODE 5 226 THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG T USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFORMATION 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES gt Perform Verification TEST VER 1A 289 TEST COMPLETE Check connectors Clean repair as necessary 0 MOOO III CC M TJ BODY SENTRY KEY IMMOBILIZER MODULE 0 MOOO mr uUuco XJ BODY SENTRY KEY IMMOBILIZER MODULE ANTENNA FUSED FUSED IGN SWITCH OUTPUT RUN START CCD BUS VT BR CCD BUS GROUND ANTENNA Fused Ign Switch Output Run Start Ground Ground 290 TEST TC 226A CONTINUED REPAIRING NO CCD BUS MESSAGE RECEIVED FROM SKIM TRANSPONDER CHIP IN KEY Cor FUSE UE 1 4 IGNITION SWITCH 10 AMP FUSE BLOCK FUSE
43. 5 5 2 CONTINUED FROM THE PREVIOUS PAGE USING THE DRB ACTUATE THE FUEL SYSTEM CONTINUED CHECKING THE FUEL SYSTEM NOTE IT MAY BE NECESSARY TO USE A MECHANICS STETHOSCOPE IN THE NEXT STEP LISTEN FOR FUEL PUMP OPERATION AT THE FUEL TANK CAN THE FUEL PUMP OPERTION BE HEARD PERFORM TEST NS 5A KEY OFF WARNING THE FUEL SYSTEM MUST BE OPENED AND MAY BE UNDER HIGH PRESSURE SEE GENERAL INFO 9 0 INSTALL A FUEL PRESSURE GAUGE TO THE FUEL SYSTEM NOTE THE FUEL TANK MUST BE AT LEAST 1 4 FULL FOR THE FOLLOWING TESTS KEY ON USING THE DRB ACTUATE THE FUEL SYSTEM READ THE FUEL PRESSURE GAUGE IS THE FUEL PRESSURE ABOVE 54 2 PSI gt REPLACE FUEL FILTER REGULATOR AND PRIMARY FILTER Perform Verification TEST VER 1A Check connectors Clean repair as necessary 445 IS THE FUEL PRESSURE BELOW 44 2 PSI PERFORM TEST 5 4 DID THE VEHICLE INITIALLY START amp STALL REPEATEDLY PERFORM TEST 5 7 PERFORM TEST 5 3 40 OZ TEST NS 3A CHECKING ENGINE MECHANICAL SYSTEMS Perform TEST NS SEL Before Proceeding 0 40 4 3 40 OZ FIRING ORDER 1342 CLOCKWISE ROTATION 1040503 FIRING ORDER 153624
44. Check connectors Clean repair as necessary 125 0 MOOO 0 0 70 TEST TC 35A CONTINUED REPAIRING NO VEHICLE SPEED SENSOR SIGNAL TJ XJ BODY VEHICLE SPEED SENSOR HARNESS CONNECTOR 0 MOOO CC 1 FUNCTION 1 VI OR 5 VOLT SUPPLY 2 BR YL SENSOR GROUND WT OR VEHICLE SPEED SENSOR SIGNAL 80 0463 0 5 35 CONTINUED FROM PREVIOUS PAGE EST TC 35A CONTINUED REPAIRING NO VEHICLE SPEED SENSOR SIGNAL WITH THE WHEELS STILL ROLLING OBSERVE THE SPEEDOMETER DOES THE SPEEDOMETER READ ABOVE ZERO MPH PERFORM TEST 5 THE VSS ADAPTER FOR PROPER SEATING AND POSITIONING REFER TO SERVICE MANUAL WAS THE ADAPTER POSITIONED AND SEATED PROPERLY REPAIR AS NECESSARY KEY OFF DISCONNECT THE VEHICLE SPEED SENSOR VSS CONNECTOR KEY ON MEASURE THE VOLTAGE AT THE 5 VOLT SUPPLY CIRCUIT FIG 1 IS THE VOLTAGE ABOVE 4 0 VOLTS REPAIR THE OPEN 5 SUPPLY CIRCUIT KEY ON MEASURE THE VOLTAGE AT THE VEHICLE SPEED SENSOR SIGNAL CIRCUIT 1 IS THE VOLTAGE ABOVE 4 5 VOLTS I 3 CONTINUE TEST TC 35A ON THE NEXT PAGE USING A JUMPER WIRE CONNECT ONE END TO THE VSS SENSOR
45. 0 MOOO CC Possible causes gt Battery temp sensor failure gt Open circuit in battery temp sensor signal circuit gt Short circuit in battery temp sensor signal circuit gt PCM failure gt Connector terminals gt Connector wires 805e2a55 TJ XJ BODY TO POWERTRAIN OTHER CONTROL SENSORS MODULE BATTERY TEMPERATURE BR YL SENSOR Sensor Ground PK YL Battery Temperature Sensor Signal 80b118ad 258 TEST TC 153A REPAIRING BATTERY TEMP SENSOR VOLTAGE LOW TOO HIGH Perform TEST DTC Before Proceeding START TEST TC 153A KEY ON USING THE DRB READ THE BATTERY TEMPERATURE SENSOR BTS VOLTAGE IS THE BATTERY TEMPERATURE SENSOR VOLTAGE BELOW 0 5 VOLT gt CONTINUE TEST TC 153A ON THE NEXT PAGE 5 VOLTAGE ABOVE 4 9 VOLTS PERFORM TEST IC 153B USE THE SCHEMATIC AS A GUIDE AND WIGGLE THE BATTERY TEMP SENSOR CONNECTOR AND HARNESS gt MONITOR THE DRB DISPLAY WAS THERE ANY BATTERY TEMP SENSOR VOLTAGE CHANGE REPAIR THE CONNECTOR OR HARNESS THAT CAUSED THE VOLTAGE CHANGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE CONNECTORS AND HARNESS WIRING
46. CAM SIGNAL PCM of Code Cam Signal at When monitored Ignition ON Set condition If 96 crank signals are counted and no signal from the cam position sensor is present the code will set Theory of operation The cam position sensor is a hall effect type sensor used to detect the camshaft position The PCM supplies 5 volts and a ground to power up the sensor The PCM also supplies a 5 volt pull up voltage The sensor signal is created by the pulse ring in the distributor passing through the sensor When the leading edge of the ring is in the sensor the sensor is high 5 0V when the trailing edge is clear of the sensor the signal is low 0 3V MOOO mr uUuco Possible causes Open 5 volt supply circuit Open sensor ground Open or shorted signal circuit Damaged pulse ring Failed sensor Failed PCM SA HS BODY CRANKSHAFT POWERTRAIN SENSOR AND position CONTROL MAP SENSOR SENSOR MODULE GY BK Sensor Signal OR 5 Volt Supply TN YL CMP Sensor Signal CAMSHAFT POSITION SENSOR BR YL Sensor Ground TO OTHER SENSORS 80a4ef 4 1 5 5 IC 1C REPAIRING NO CAM SIGNAL AT PCM ATTEMPT TO START THE ENGINE IF NOT ALREADY RUNNING DOES THE ENGINE START PERFORM 5 5 NS SEL AT THIS TIME THE CONDITION REQUIRED TO
47. Check connectors Clean repair as necessary 325 REPLACE THE SKIM MODULE lt MA lt 120 lt JMN r e D I OH 2 2 lt MA lt 120 lt JMN r e D I OH S 2 TEST 5 REPAIRING TRANSPONDER CRC CYCLIC REDUNDANCY CHECK FAILURE Perform TEST SK 1A Before Proceeding TJ BODY SENTRY KEY IMMOBILIZER ANTENNA TRANSPONDER CHIP IN KEY MODULE cc FUSE BLOCK FUSE 1 10 AMP FUSE BLOCK FUSE 12 TN EK FUSED TO PDC P FUSE 4 TO IGNITION SWITCH DB FUSED IGN SWITCH OUTPUT RUN START WT BK CCD BUS 3 TO OTHER CCD BUS MODULES BK GROUND BK LB GROUND 80b6f cc Name of code Transponder CRC Cyclic Redundancy Check Failure When monitored With the ignition on and during key programming operation Set condition The SKIM receives five consecutive transponder messages that are correctly formatted but contain invalid data Theory of operation When the ignition is turned on or during key programming the SKIM attempts to power up the transponder The SKIM makes up to five attempts to communicate with the transponder The SKIM checks for proper communication format and valid data from the transponder Possible cause Failed transponder Failed SKIM Invalid key Electro magnetic interference 80b5cc72 326 XJ BODY SENTRY KEY IMMOBILIZER
48. DID THE 1 1 02 SENSOR VOLTAGE DROP BELOW 1 0 VOLTS REPAIR THE SENSOR GROUND CIRCUIT FOR AN OPEN X REPLACE THE POWERTRAIN CONTROL MODULE MOOO mr oUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 179 TEST 62 CONTINUED REPAIRING 1 1 02 SENSOR SHORTED VOLTAGE TJ BODY POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND UPSTREAM OXYGEN SENSOR SIGNAL ASD RELAY OUTPUT MOOO mr uUuco UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR 80b76ec5 SIGNAL XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND UPSTREAM OXYGEN SENSOR SIGNAL ASD RELAY OUTPUT UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR 80b766c4 SIGNAL EST 62 CONTINUED REPAIRING 1 1 02 SENSOR SHORTED TO VOLTAGE 5 62 THE PREVIOUS PAGE WAS THE VOLTAGE ABOVE 5 2 VOLTS REPAIR THE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE IF OKAY REPLACE PCM KEY OFF DISCONNECT THE BLACK PCM HARNESS CONNECTOR gt USE AN OHMMETER IN THE FOLLOWING 5 MEASURE THE 1 1 02 SENSOR CIRCUIT FROM THE 1 1 02 SENSO
49. THE FOLLOWING STEP REPAIRING MAP SENSOR VOLTAGE LOW NO 5 VOLTS TO ENSOR MEASURE THE RESISTANCE OF THE MAP SENSOR 5 VOLT SUPPLY CIRCUIT gt FROM THE MAP SENSOR CONNECTOR TO THE PCM CONNECTOR 1 I3 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN 5 VOLT SUPPLY CIRCUIT WITH AN OHMMETER SENSOR 5 VOLT SUPPLY CKT FOR RESISTANCE TO GROUND EIG 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE 5 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND REPLACE THE POWERTRAIN CONTROL MODULE Qo 0m MOOO mr uUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 139 TEST TC 37A REPAIRING MAP SENSOR VOLTAGE HIGH Perform TEST DTC Before Proceeding TJ XJ BODY POWERTRAIN TO MANIFOLD GROUND CONTROL VACUUM TO OTHER MODULE SENSORS BR YL Sensor Ground 24 DG RD Map Sensor Signal 457 OR 5V Supply TO TP SENSOR 0 MOOO mr uUuco MAP SENSOR 80a4d2e2 Name of code Map Sensor Voltage Too High When monitored With engine rpm above 400 but less than 3520 and the TP sensor voltage less than 1 13 volt and battery voltage greater than 10 4 volts Set condition The MAP sensor signal voltage is greater than 4 88 volts at start or with the engine runn
50. o m aum 0 2 gt lt TEST VER 4A SPEED CONTROL VERIFICATION Important Note If the Powertrain Control Module has been changed and the correct VIN and mileage have not been programmed a DTC will be set in the ABS Airbag and SKIM modules In addition if the vehicle is equipped with a Sentry Key Immobilizer Module SKIM Secret Key data must be updated to enable starting Refer to GENERAL INFORMATION section 8 0 for programming the Powertrain Control Module and SKIM For ABS and Airbag Systems ACTION 1 Enter correct VIN and Mileage in PCM 2 Erase codes in ABS and Airbag modules Inspect the vehicle to ensure that all engine components are connected Reassemble and reconnect components as necessary Connect the DRB to the PCM data link connector and erase the codes Ensure no other speed control problems remain by doing the following Road test the vehicle at a speed above 30 mph Turn the speed control ON OFF switch to the ON position Depress and release the SET switch If the speed control did not engage the repair is not complete Quickly depress and release the RESUME ACCEL switch If the vehicle speed did not increase by 2 mph the repair is not complete Press and HOLD coast switch vehicle speed should decrease if no decrease the repair is not complete Using caution depress and release the brake pedal If the speed control did not disengage the repair is
51. C30 VT BR CCD BUS 80b6b37c XJ BODY INSTRUMENT CLUSTER HARNESS CONNECTOR C2 1 WT BK CCD BUS 2 VI BR CCD BUS POWERTRAIN CONTROL MODULE HARNESS CONNECTOR C28 WT BK CCD BUS VT BR CCD BUS 8065637 5 225 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT PCM HARNESS CONNECTOR DISCONNECT INSTRUMENT CLUSTER CONNECTOR USE AN OHMMETER IN THE FOLLOWING STEPS EST TC 225A CONTINUED REPAIRING NO CCD BUS MESSAGE FROM MIC MEASURE THE RESISTANCE OF THE CCD CKT BETWEEN PCM HARNESS CONNECTOR AND THE INSTRUMENT CLUSTER HARNESS CONNECTOR FIG OR 2 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE CCD CIRCUIT FOR AN MEASURE THE RESISTANCE OF THE CCD CKT BETWEEN THE PCM HARNESS CONNECTOR AND THE INSTRUMENT CLUSTER HARNESS CONNECTOR FIG 1 OR 2 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE CCD CIRCUIT FOR AN OPEN REPLACE THE INSTRUMENT CLUSTER MOOO mr oUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 287 TEST TC 226A REPAIRING CCD BUS MESSAGE RECEIVED FROM 5 Perform TEST DTC Before Proceeding TJ BODY ANTENNA TRANSPONDER SENTRY
52. MOLDED TRANSPONDER 7 ezm o o DWMN r woss lt MA uUu zmo MOLDED CAP REMOVED SENTRY KEY 80b6h145 TEST SK 8A TEST 5 CONTINUED FROM THE PREVIOUS PAGE USING THE DRB ATTEMPT TO REPROGRAM THE IGNITION KEY TO THE SKIM MODULE SEE GENERAL INFO 8 0 CONTINUED REPAIRING TRANSPONDER RESPONSE MISMATCH USING THE DRB CLEAR CODES TURN IGNITION OFF WAIT 10 SECONDS TURN IGNITION ON AND CHECK CODES DOES THIS CODE SET TEST COMPLETE REPLACE IGNITION KEY WITH A KNOWN GOOD KEY USING THE DRB PROGRAM THE KNOWN GOOD IGNITION KEY THE SKIM MODULE SEE GENERAL INFO 8 0 USING THE DRB CLEAR CODES TURN IGNITION OFF WAIT 10 SECONDS TURN IGNITION ON AND CHECK CODES DOES THIS CODE SET TEST COMPLETE Perform Verification TEST VER 1A Check connectors Clean repair as necessary 337 REPLACE THE SKIM MODULE lt MA lt 120 lt JMN r e D I OH 2 2 lt MA lt 120 lt HPN sc E e D I OH S 2 TEST SK 9A REPAIRING MISMATCH Perform TEST SK 1A Before Proceeding TJ BODY XJ BODY ANTENNA TRANSPONDER SENTRY KEY CHIP IMMOBILIZER IN KEY MODULE gie FUSE BLOCK FUSED B UA TO P
53. gt 10 OZ TEST NS 1A QUALIFYING NO START CONDITION Perform TEST NS SEL Before Proceeding SPARK PLUG CABLE SPARK TESTER 80 2432 5 1 5 5 5 1 DISCONNECT THE SPARK PLUG CABLE AT SPARK PLUG 41 QUALIFYING A NO START CONDITION Perform TEST NS SEL Before Proceeding CONNECT THE CABLE TO A SPARK TESTER CONNECT THE SPARK TESTER TO A GOOD GROUND FIG 1 WHILE CRANKING THE ENGINE FOR 10 SECONDS WATCH FOR SPARK IS THERE GOOD SPARK DOES THE VEHICLE START AND STALL PERFORM TEST NS 7A KEY OFF REMOVE THE COIL SECONDARY CABLE FROM THE DISTRIBUTOR PERFORM TEST NS 2A CONNECT THE CABLE TO A SPARK TESTER CONNECT THE SPARK TESTER TO A GOOD GROUND FIG 1 gt WHILE CRANKING THE ENGINE FOR 10 SECONDS WATCH FOR SPARK I 35 CONTINUE TEST NS 1A ON THE NEXT PAGE 3 40 OZ Perform Verification TEST VER 1A Check connectors Clean repair as necessary 433 TEST 1 CONTINUED QUALIFYING NO START CONDITION SPARK PLUG CABLE RESISTANCE MINIMUM MAXIMUM 250 Ohms Per Inch 1000 Ohms Per Inch 3000 Ohms Per Foot 12 000 Ohms Per Foot 0 40 4 gt 10 OZ 80b171eb TYPICAL DISTRIBUTOR CAP 1070304 1
54. 1 REMOVE SENSOR AND INSPECT CONDITON OF VACUUM PORT ALSO INSPECT CONDITION OF INTAKE MANIFOLD OR THROTTLE BODY VACUUM PORT IS THERE A RESTRICTION OR DEFECT IN THE VACUUM PORTS RESTRICTED OR DEFECTIVE VACUUM PORTS Perform Verification TEST VER 2A Check connectors Clean repair as necessary 147 L REPLACE THE MAP SENSOR MOOO TEST TC 39A CONTINUED REPAIRING NO CHANGE MAP FROM START RUN TJ XJ BODY MAP SENSOR CONNECTOR 0 MOOO CC 5 VOLT SUPPLY DG RD SENSOR SIGNAL SENSOR GROUND 808919155 5 39 CONTINUED FROM PREVIOUS PAGE IGNITION KEY ON ENGINE OFF EST 39 CONTINUED REPAIRING CHANGE FROM START RUN REMOVE SENSOR AND INSPECT CONDITON OF VACUUM PORT ALSO INSPECT CONDITON OF INTAKE MANIFOLD OR THROTTLE BODY VACUUM PORT WAS THERE A RESTRICTION 3 REMOVE THE RESTRICTION AND REINSTALL THE MAP SENSOR USE VOLTMETER THE FOLLOWING STEP MEASURE THE MAP SENSOR 5 SUPPLY CIRCUIT FIG 1 gt IS THE VOLTAGE ABOVE 4 5 VOLTS REPAIR THE OPEN MAP SENSOR 5 SUPPLY CIRCUI
55. 5 5 1 CONTINUED FROM THE PREVIOUS PAGE CONTINUED QUALIFYING A NO START CONDITION IS THERE GOOD SPARK REPAIR THE SECONDARY IGNITION DISTRIBUTOR CAP ROTOR CABLES KEY OFF REMOVE THE COIL SECONDARY CABLE USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE RESISTANCE OF THE COIL SECONDARY CABLE IS THE RESISTANCE WITHIN THE SPECIFICATION FIG 1 SECONDARY CABLE DISTRIBUTOR FIG 2 WHILE CRANKING THE ENGINE WATCH FOR THE ROTOR TO TURN DID THE ROTOR TURN WHEN THE ENGINE WAS CRANKED DISTRIBUTOR DRIVE SYSTEM REINSTALL THE DISTRIBUTOR CAP AND IGNITION COIL CABLE DISCONNECT THE IGNITION COIL CONNECTOR INSPECT ALL TERMINALS IS ANY TERMINAL DAMAGED PUSHED OUT OR MISWIRED REPAIR TERMINAL S FOR DAMAGE PUSHOUT OR MISWIRING USING THE DRB ACTUATE THE GENERATOR FIELD CONTINUE TEST gt NS 1A ON THE Perform Verification TEST VER 1A Check connectors Clean repair as necessary 435 NEXT PAGE 3 40 OZ TEST 1 CONTINUED QUALIFYING NO START CONDITION TJ BODY IGNITION COIL CONNECTOR 0 40 4 gt 10 OZ COLOR FUNCTI
56. CAUSED THE VOLTAGE CHANGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES A TEST COMPLETE MOOO mr uUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 171 MOOO CC M TEST TC 58A CONTINUED REPAIRING INTAKE AIR TEMP SENSOR VOLTAGE HIGH TJ BODY XJ BODY INTAKE AIR INTAKE AIR TEMPERATURE SENSOR CONNECTOR TEMPERATURE SENSOR CONNECTOR COLOR FUNCTION CAV COLOR FUNCTION BK RD IAT SIGNAL 1 SENSOR GROUND SENSOR GROUND 2 BK RD IAT SIGNAL 80061064 80 099 6 TJ BODY XJ BODY INTAKE AIR INTAKE AIR TEMPERATURE SENSOR TEMPERATURE SENSOR CONNECTOR CONNECTOR COLOR FUNCTION La COLOR FUNCTION BK RD IAT SIGNAL SENSOR 2 SENSOR GROUND GROUND 2 BK RD IAT SIGNAL POWERTRAIN 5 gt CONTROL MODULE IC 2 4 CONTROL MODULE BLACK CONNECTOR BLACK CONNECTOR COLOR Y 41 A4 sENSORGROUND lais A4 Ausl BK RD IAT SIGNAL 15 BK RD 80076 2 172 TEST TC 58A CONTINUED FROM THE PREVIOUS
57. CC Perform Verification TEST VER 3A Check connectors Clean repair as necessary TEST 10 REPAIRING AUTO SHUTDOWN RELAY CONTROL CIRCUIT Perform TEST DTC Before Proceeding TJ BODY 7777 2 7 IGNITION TO SWITCH BATTERY TO FUEL 4 TO PCM PUMP RELAY DB RD WT POWERTRAIN CONTROL 86 30 MODULE ASD RELAY DB YL ASD RELAY CONTROL 85 87 TO IGN COIL INJECTORS DG PK O2 SENSORS ASD RELAY OUTPUT AND GENERATOR C12 MOOO mr oUco 80061040 XJ BODY TO IGNITION TO SWITCH BATTERY POWERTRAIN CONTROL 30 MODULE ASD RELAY DB YL ASD RELAY To CONTROL 85 RD 87 IGNCOIL INJECTORS DG OR gt O2SENSORS ASD RELAY OUTPUT AND GENERATOR C12 80b04fe0 Name of code Auto Shutdown Relay Control Circuit When monitored With ignition key on and battery voltage greater than 10 4 volts Theory of operation The Automatic Shutdown Relay ASD controls the 12 volt source to the fuel injectors ignition coil s and the oxygen heaters And low pressure shutoff solenoid on CNG The relay is located in the Power Distribution Center PDC One side of the relay control coil is supplied with battery voltage when the ignition switch is in the start or run position The circuit is completed when the other side of the relay coil is grounded by the Powertrain Control Module PCM The PCM grounds the control circuit when the ignition switch is in the start or
58. CONTINUED REPAIRING SPEED CONTROL POWER RELAY SPEED CONTROL 12V DRIVER CIRCUIT USING AN OHMMETER MEASURE THE S C VACUUM SOLENOID CONTROL CIRCUIT BETWEEN THE S C SERVO AND PCM 1 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN S C VACUUM SOLENOID CONTROL CIRCUIT USING MEASURE THE S C VENT SOLENOID CONTROL CIRCUIT BETWEEN THE S C SERVO AND PCM FIG 1 gt IS THE RESISTANCE BELOW 5 0 OHMS gt S C VENT SOLENOID CONTROL CIRCUIT SS REPALCE THE SPEED CONTROL SERVO MOOO mr uUuco Perform Verification TEST VER 4A Check connectors Clean repair as necessary 191 MOOO mr uUuco TEST TC 82B EE de SPEED CONTROL POWER RELAY OR SPEED CONTROL 12V DRIVER IRCUIT Perform TEST TC 82A Before Proceeding TJ BODY BRAKE LAMP SWITCH CONNECTOR FUNCTION BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY 5 BRAKE SWITCH OUTPUT FUSED B BRAKE LAMP SWITCH OUTPUT SPEED CONTROL SERVO CONNECTOR FUNCTION S C VACUUM SOLENOID CONTROL S C VENT SOLENOID CONTROL S C BRAKE SWITCH OUTPUT GROUND 80b08a9f BRAKE LAMP SWITCH CONNECTOR FUNCTION BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED
59. FUSED B FUSED IGNITION SWITCH OUTPUT RAD FAN RELAY CONTROL RAD FAN RELAY OUTPUT 80076699 5 14 THE PREVIOUS PAGE REMOVE THE RADIATOR FAN RELAY XX EST TC 14A CONTINUED REPAIRING RADIATOR FAN RELAY CIRCUIT TURN IGNITION ON USING A VOLTMETER MEASURE THE FUSED IGNITION SWITCH OUTPUT CIRCUIT FIG 1 IS THE VOLTAGE ABOVE 10 0 VOLTS l REPAIR THE FUSED IGNITION SWITCH OUTPUT CIRCUIT FOR AN OPEN TURN THE IGNITION OFF USE AN OHMMETER IN THE FOLLOWING STEPS MEASURE THE RESISTANCE BETWEEN TERMINALS 85 AND 86 OF THE RADIATOR FAN RELAY FIG 2 gt IS THE RESISTANCE BETWEEN 60 TO 80 OHMS REPLACE THE RADIATOR FAN RELAY KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS XX MEASURE THE RESISTANCE BETWEEN GND AND CAV 85 OF THE RELAY HARNESS CONNECTOR FIG 1 15 5 5 BELOW 5 0 OHMS REPAIR THE RADIATOR FAN CONTROL RELAY CIRCUIT FOR A SHORT TO GROUND MEASURE THE RESISTANCE OF THE RADIATOR FAN RELAY CONTROL CIRCUIT FROM THE RELAY CONNECTOR TO PCM HARNESS CONNECTOR FIG 3 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR OPEN RADIATOR FAN RELA
60. MOOO mr uUuco TEST 119 REPAIRING FUEL SYSTEM LEAN 1 1 LEAN Perform TEST TC 119A Before Proceeding BODY POWERTRAIN CONTROL MODULE Downstream Oxygen Sensor Signal DOWNSTREAM OXYGEN SENSOR Relay Output MOOO mr uUuco Sensor Ground BK DG IGNITION COILS Upstream Oxygen GENERATOR AND Sensor Signal INJECTORS UPSTREAM OXYGEN SENSOR 805118 1 XJ BODY POWERTRAIN CONTROL MODULE TN WT ASD RELAY Downstream Oxygen Sensor signal DOWNSTREAM OXYGEN SENSOR DGAWT ASD Relay Output Sensor Ground TO BK DG IGNITION COILS Upstream Oxygen GENERATOR AND Sensor Signal 7 INJECTORS UPSTREAM OXYGEN SENSOR 80b118a2 TEST 119 REPAIRING FUEL SYSTEM LEAN 1 1 LEAN Perform TEST TC 119A Before Proceeding Using the test schematic as a guide make sure all the wiring and connectors are okay Perform each of the following tests in the order listed below If a test passes continue to the next until the problem is found Fuel Pressure TEST NTC 5A Coolant Temperature Sensor TEST NTC 6A Throttle Position Sensor TEST NTC 7A MAP Sensor TEST NTC 8A Engine Mechanical Systems TEST NTC 13A 225 0 MOOO III CC 0 MOOO CC M TEST 126 REPAIRING 1 2 02 SENSOR SHORTED VOLTAGE Perform TEST DTC Before Proceeding TJ BODY POWERTRAIN CONTROL MODULE TNANT Downstream Oxygen Sensor Signal
61. Ohms cannot be measured if voltage is present Ohms can be measured only in a non powered circuit e Voltage between any terminal and ground must not exceed 500v DC or 500v AC e Use caution when measuring voltage above 25v DC or 25v circuit being tested must be protected by a 10A fuse or circuit breaker Use the low current shunt to measure circuits up to 10A Use the high current clamp to measure circuits exceeding 10 When testing for the presence of voltage or current make sure the meter is functioning correctly Take a reading of a known voltage or current before accepting a zero reading When measuring current connect the meter in series with the load Disconnect the live test lead before disconnecting the common test lead e When using the meter function keep the DRB away from spark plug or coil wires to avoid measuring error from outside interference 5 3 Warnings and Cautions 5 3 1 Vehicle Damage Warnings Before disconnecting any control module make sure the ignition is off Failure to do so could damage the module When testing voltage or continuity at the powertrain control module use the terminal side not the wire end of the connector Do not probe a wire through the insulation this will damage it and eventually cause it to fail because of corrosion Be careful when performing electrical tests so as to prevent accidental shorting of terminals Such mistakes
62. REPAIRING SPEED CONTROL SWITCH ALWAYS LOW Perform TEST DTC Before Proceeding IS THE 5 SWITCH VOLTAGE BELOW 1 0 VOLTS gt 5 CONDITION REQUIRED TO SET THE TROUBLE CODE IS NOT PRESENT X DISCONNECT THE ON OFF SWITCH HARNESS CONNECTOR XX gt DID THE S C SWITCH VOLTS CHANGE TO 5 0 VOLTS REPLACE THE S C ON OFF SWITCH DISCONNECT THE RESUME ACCEL CANCEL SWITCH HARNESS CONNECTOR XX gt DID THE 5 SWITCH VOLTS CHANGE TO 5 0 VOLTS c REPLACE THE S C CANCEL SWITCH KEY OFF WAIT ONE MINUTE USING AN OHMMETER MEASURE THE RESISTANCE BETWEEN THE S C SIGNAL CIRCUIT AND THE SENSOR GROUND CIRCUIT FIG 1 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR 5 SIGNAL CIRCUIT SHORTED TO SENSOR GROUND DISCONNECT THE PCM HARNESS CONNECTORS USING AN OHMMETER MEASURE RESISTANCE OF THE S C SWITCH SIGNAL CKT TO GND FIG 2 LS IS THE RESISTANCE BELOW 5 0 OHMS c gt REPLACE THE POWERTRAIN CONTROL MODULE Perform Verification TEST VER 4A Check connectors Clean repair as necessary 201 L REPAIR S C SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND Qo 0m MOOO mr oUco TEST TC 101A
63. USING THE DRB CLEAR CODES TURN IGNITION OFF WAIT 10 SECONDS TURN IGNITION ON AND CHECK CODES DOES THIS CODE SET TEST COMPLETE Perform Verification TEST VER 1A Check connectors Clean repair as necessary 333 REPLACE THE SKIM MODULE lt MA lt 120 lt JMN r e D I OH 2 2 lt MA lt 120 lt JMN r e D I OH S 2 TEST SK 8A Perform TEST SK 1A Before Proceeding TJ BODY ANTENNA TRANSPONDER CHIP IN KEY cc FUSE 1 P FUSE 4 SENTRY KEY IMMOBILIZER MODULE TN EK FUSED 10 DB UE FUSED IGN SWITCH OUTPUT RUN START p IGNITION 10 AMP SWITCH WT BK CCD BUS 3 TO OTHER R CCD BUS MODULES BK GROUND GROUND 80b6f cc Name of code Transponder Response Mismatch When monitored With the ignition on and during key programming operation Set condition The transponder response from the Crypto algorithm fails to match the SKIM Crypto results Theory of operation When the ignition is turned on or during key programming the SKIM attempts to power up the transponder The SKIM makes up to three attempts to communicate with the transponder The SKIM checks for proper communication format and valid data from the transponder Possible cause gt Invalid key gt Fai
64. valid key CCD BUS message to the PCM The SKIM expects a CCD BUS message acknowledgment from the PCM Possible cause gt CCD BUS circuits open shorted to voltage or shorted to ground gt Failed SKIM gt Failed PCM 80bScc t 316 TEST 5 5 5 CONTINUED FROM THE PREVIOUS PAGE TURN IGNITION OFF CONTINUED REPAIRING ROLLING CODE FAILURE USING THE SCHEMATIC AS A GUIDE INSPECT THE CCD BUS CKT S BETWEEN THE PCM AND SKIM MODULE CHECK THE WIRING AND CONNECTORS FOR POOR TERMINAL CONTACT CORROSION OR DAMAGE ARE ANY OF THESE CONDITIONS PRESENT REPAIR AS NECESSARY REPLACE THE SKIM MODULE SEE GENERAL INFO 8 0 3 USING DRB ERASE CODES DRIVE VEHICLE PERFORM SEVERAL KEY CYCLES USING THE DRB CHECK CODES DOES THIS CODE APPEAR REPLACE THE POWERTRAIN CONTROL MODULE Perform Verification TEST VER 1A TEST COMPLETE Check connectors Clean repair as necessary 317 lt MA lt 120 em o o JMN r e D I OH 2 2 lt MA lt 120 lt HPN sc E e D I OH S 2 TEST 4 REPAIRING SERIAL LINK EXTERNAL FAILURE Perform TEST SK 1A Before Proceeding TJ BODY XJ BODY ANTENNA TRANSPONDER SENTRY KEY CHIP IMMOBILIZER IN KEY MODULE
65. 0 400 4 MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 399 TEST 27 CONTINUED CHECKING THE RADIATOR FAN OPERATION RADIATOR FAN MOTOR CONNECTOR MOOO mr ocozm4 oz COLOR FUNCTION 1 LB RADIATOR FAN RELAY OUTPUT 2 BK GROUND 80965360 TEST 27 CONTINUED CHECKING THE RADIATOR FAN OPERATION TEST 27 USING AN OHMMETER CONTINUED FROM MEASURE THE RAD IS THE RESISTANCE REPAIR THE OPEN THE PREVIOUS FAN GROUND CIRCUIT gt BELOW 5 0 OHMS RADIATOR FAN PAGE TO A GROUND GROUND CIRCUIT 1 REPLACE THE RADIATOR FAN MOTOR Perform Verification TEST VER 2A Check connectors Clean repair as necessary 401 0 40 4 MOOO mr ocozm oz TEST SC 1A CHECKING THE SPEED CONTROL SYSTEM Perform TEST DTC Before Proceeding TJ XJ BODY SPEED CONTROL POWERTRAIN i CONTROL L _ _ SEI eng MODULE BR YL SENSOR GROUND RD LG SPEED CONTROL SW SIGNAL CANCE YL RD 12 VOLT SUPPLY 104200 WT PK BRAKE SWITCH SENSE SERVO TN RD S C VAC SOL CONTROL SOLENOIDS LG RD 5 BRAKE 4 BRAKE S C VENT SOL CONTROL SW OUTPUT SWITCH 306099 0 402 5 1 CHECKING THE SPEED CONTROL SYSTEM Perform TEST DTC Before Proceeding START TEST SC 1A NO
66. 5 23 5 2 3 Servicing 5 0 23 5 24 Safety 23 5 3 WARNINGS AND CAUTIONS 24 5 3 1 Vehicle Damage 5 24 5 3 2 Road Testing a Complaint Vehicle 24 7 1 TABLE OF CONTENTS Continued 7 0 DIAGNOSTIC INFORMATION AND PROCEDURES 25 GENERAL TROUBLESHOOTING dct 25 TROUBLE CODE TEST DTC TESCHECKING THE SYSTEM FOR DIAGNOSTIC TROUBLE CODES 26 TROUBLE CODE TESTS TC 1A REPAIRING NO CAM SIGNAL 28 TC 5A REPAIRING CHARGING SYSTEM VOLTAGE TOO LOW 36 TC 6A REPAIRING CHARGING SYSTEM VOLTAGE TOO HIGH 42 TC 10A REPAIRING AUTO SHUTDOWN RELAY CONTROL CIRCUIT 50 TC 11A REPAIRING GENERATOR FIELD NOT SWITCHING PROPERLY 54 TC 12A REPAIRING TORQUE CONVERTER CLUTCH TRANS RELAY CKT TJ XJ BODY WITH 3SPD AUTO TRANS 58 TC 14A REPAIRING RADIATOR FAN RELAY CIRCUIT 60 TC 15A REPAIRING SPEED CONTROL CIRCUITS 64 TC 16A REPAIRING A C CLUTCH RELAY 72 TC 18A REPAIRING EVAP PURGE SOLENOID CIRCUIT 76 TC 19A REPAIRING INJECTOR CONTROL CIRCUIT 8
67. FIG 1 gt IS THE RESISTANCE BELOW 5 0 OHMS ON ANY OF THE DRIVERS REPAIR THE IAC DRIVER CIRCUITS SHORTED TOGETHER MEASURE THE RESISTANCE BETWEEN THE IAC 2 DRIVER AND 3 4 DRIVERS FIG 1 gt IS THE RESISTANCE BELOW 5 0 OHMS ON ANY OF THE DRIVERS REPAIR THE IAC DRIVER CIRCUITS SHORTED TOGETHER MEASURE THE RESISTANCE BETWEEN THE 3 DRIVER AND 4 DRIVER FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE IAC DRIVER CIRCUITS SHORTED TOGETHER REPLACE THE IDLE AIR CONTROL MOTOR gt 10 OZ Perform Verification TEST VER 1A Check connectors Clean repair as necessary 477 gt 10 OZ TEST NS 8A REPAIRING A START AND STALL CONDITION Perform TEST NS SEL Before Proceeding TEST NS 8A REPAIRING START AND STALL CONDITION Perform TEST NS SEL Before Proceeding At this point in the diagnostic test procedure you have determined that all of the engine electrical systems are operating as designed therefore they are not the cause of the start and stall problem The following additional items should be checked as possible mechanical causes of the no start condition Any one or more of these items can produce a no start condition none can be overlooked as a possi
68. WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 2A gt TEST COMPLETE Check connectors Clean repair as necessary 259 MOOO CC 0 MOOO mr uUuco TEST TC 153A CONTINUED REPAIRING BATTERY TEMP SENSOR VOLTAGE TOO LOW TOO HIGH TJ XJ BODY COLOR FUNCTION 1 PK YL BATTERY TEMP SENSOR SIGNAL 2 BR YL SENSOR GROUND 80 53484 5 153 PREVIOUS PAGE KEY OFF DISCONNECT THE BATTERY TEMPERATURE SENSOR BTS CONN KEY ON USING THE DRB READ THE BATTERY TEMP SENSOR VOLTAGE EST TC 153A CONTINUED REPAIRING BATTERY TEMP SENSOR VOLTAGE TOO LOW TOO HIGH 15 VOLTAGE ABOVE 4 0 VOLTS REPLACE THE BATTERY TEMPERATURE SENSOR KEY OFF DISCONNECT THE PCM HANRESS CONNECTORS X USING AN OHMMETER MEASURE THE BTS SIGNAL CIRCUIT TO GROUND FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE BTS SIGNAL CIRCUIT FOR A SHORT TO GROUND USING AN OHMMETER MEASURE THE RESISTANCE BETWEEN THE BTS SIGNAL CIRCUIT lt AND SENSOR GROUND CIRCUIT AT BTS H
69. 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT PK DB FUSED B WT TN BRAKE LAMP SWITCH OUTPUT CONNECTOR X 2 2460302 806099 1 XJ BODY TJ XJ BODY BRAKE LAMP SPEED CONTROL SWITCH CONNECTOR 9 FUNCTION 1 BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED B 4 80004166 80 0754 21 gt gt 2 gt gt 20 4 5200 2 4 7 Switches Continued TJ XJ PARK NEUTRAL POSITION SWITCH CONNECTOR SPEED CONTROL SWITCH CONNECTOR XJ 2 5L A T 1 WT FUSED IGNITION SWITCH OUTPUT 2 BK WT PARK NEUTRAL POSITION SW SENSE 3 BR LG BACK UP LAMPS FEED 2 TJ 2 5L AND 4 0L A T COLOR FUNCTION CAV COLOR FUNCTION 1 VTAVT FUSED IGNITION SWITCH OUTPUT 1 BR YL GROUND 2 PARK NEUTRAL POSITION SW SENSE 2 RD LG SPEED CONTROL SIGNAL 3 BACK UP LAMPS FEED 80b76f29 80ab3724 XJ BODY 4 0L TJ XJ 2 5L TRANSMISSION RANGE SENSOR CONNECTOR FUNCTION 7 BK WT PARK NEUTRAL POSITION SWITCH SENSE 8 BK GROUND ELECTRICAL POWER STEERING CONNECTOR 80b76f2a PRESSURE SWITCH 80242593 TJ XJ 2 5L POWER STEERING SWITCH CONNECTOR 2 COLOR FUNCTION 1 GROUND 2 DB BR POWER STEERING PRESSURE SW SENSE 2 5L TJ XJ 80b76127 22 5 0 DISCLAIMERS SAFETY WARNINGS 5 1 Disclaimer
70. 229 TEST 126 CONTINUED REPAIRING 1 2 02 SENSOR SHORTED TO VOLTAGE TJ BODY POWERTRAIN CONTROL MODULE CONNECTORS COLOR FUNCTION A4 BR YL SENSOR GROUND 25 DOWNSTREAM OXYGEN SENSOR SIGNAL DG FK ASD RELAY OUTPUT DOWNSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND DOWNSTREAM OXYGEN SENSOR SIGNAL Qo 0m MOOO mr oUuco 80b118a8 XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS COLOR FUNCTION A4 SENSOR GROUND A25 DOWNSTREAM OXYGEN SENSOR SIGNAL C12 ASD RELAY OUTPUT DOWNSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND DOWNSTREAM OXYGEN SENSOR SIGNAL 80b118a9 5 126 THE PREVIOUS PAGE EST 126 CONTINUED REPAIRING 1 2 02 SENSOR SHORTED VOLTAGE WAS THE VOLTAGE ABOVE 5 2 VOLTS REPAIR THE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE IF OKAY REPLACE PCM KEY OFF DISCONNECT THE PCM HARNESS CONNECTOR USE THE FOLLOWING STEP MEASURE THE 1 2 02 SENSOR CIRCUIT FROM THE 1 2 02 SENSOR HARNESS CONNECTOR TO THE PCM HARNESS CONNECTOR FIG 1 OR 2 WAS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SENSOR SIG
71. DG PK ASD Relay Output DOWNSTREAM OXYGEN SENSOR BR YL Sensor Ground BK DG Upstream Oxygen Sensor Signal OR DG ASD Relay Output BK Ground TO IGNITION COILS GENERATOR AND INJECTORS UPSTREAM OXYGEN SENSOR 80b118a1 JTEC 02 SENSOR CONFIGURATION UPSTREAM DOWNSTREAM UPSTREAM DOWNSTREAM XJ2 5L 14 UPSTREAM XJ2 5L 1 2 DOWNSTREAM XJ4 0L 1 1 UPSTREAM XJ4 0L 1 2 DOWNSTREAM 80b76ec3 XJ BODY POWERTRAIN CONTROL MODULE TNANT ASD RELAY Downstream DOWNSTREAM OXYGEN SENSOR Relay Output ASD Relay Output BR YL Sensor Ground TO IGNITION COILS GENERATOR AND INJECTORS BK DG Upstream Oxygen Sensor Signal UPSTREAM OXYGEN SENSOR 80b118a2 Name of code Downstream O2 Sensor Shorted To Voltage When monitored With the engine running and coolant temperature at 180 F for 4 minutes or more Set condition The downstream oxygen sensor signal is above 1 5 volts Two trips are required with the condition present to set the code Theory of operation Effective control of exhaust emissions is achieved by an oxygen feedback system The downstream oxygen sensor O25 which is located in the exhaust path after the catalyst It monitors the oxygen content of the exhaust gas as it leaves the catalyst Once the sensor reaches its normal operating temperature of 300 350 degrees Celsius it generates a voltage inversely proportional to the amount of oxygen in the ex
72. INTAKE AIR TEMP SENSOR VOLTAGE HIGH INTAKE AIR TEMP SENSOR VOLTAGE LOW INTERMITTENT LOSS OF CMP OR CKP INTERNAL CONTROLLER FAILURE SENSOR VOLTAGE TOO HIGH SENSOR VOLTAGE TOO LOW NO 5 VOLTS TO MAP SENSOR NO ASD RELAY OUTPUT VOLTAGE AT PCM NO CAM SIGNAL AT PCM NO CCD BUS MESSAGE RECEIVED FROM TCM NO CCD BUS MESSAGE RECEIVED FROM MIC NO CCD BUS MESSAGE RECEIVED FROM SKIM NO CHANGE IN MAP FROM START TO RUN NO CRANK REFERENCE SIGNAL AT PCM NO VEHICLE SPEED SENSOR SIGNAL OIL PRESSURE SENSOR LOW EXCEEDED OIL PRESSURE SENSOR HIGH EXCEEDED P N SWITCH STUCK IN PARK OR IN GEAR PCM FAILURE EEPROM WRITE DENIED PCM FAILURE SPI COMMUNICATIONS POWER STEERING SWITCH FAILURE RADIATOR FAN CONTROL RELAY CIRCUIT SPEED CONTROL POWER RELAY OR S C 12V DRIVER CKT SPEED CONTROL SOLENOIDS CIRCUITS SPEED CONTROL SWITCH ALWAYS HIGH SPEED CONTROL SWITCH ALWAYS LOW THROTTLE POSITION SENSOR VOLTAGE HIGH THROTTLE POSITION SENSOR VOLTAGE LOW TORQ CONV CLU NO RPM DROP AT LOCKUP TORQUE CONVERTER CLUTCH SOLENOID TRANS RELAY CKT 5 VOLTAGE DOES NOT AGREE WITH 1 1 O28 VOLTAGE SHORTED TO GROUND 1 1 O2 SENSOR SHORTED TO VOLTAGE WRONG OR INVALID KEY MSG RECEIVED FROM SKIM These DTC s can set by Low Fuel Level add fuel to 1 4 tank and test DTC to set again Trouble code information on last page of DTC test For an AISIN TRANS TCM DTC PRESENT trouble code use the appropriate Transmission diagnost
73. REPAIRING FUEL PUMP SYSTEM RELAY CONTROL CIRCUIT Perform TEST DTC Before Proceeding TJ BODY 2B DGANT TO FLS D IGN FUEL PUMP IGNITION o OUTPUT RELAY QUTPUT SWITCH POWERTRAIN CONTROL MODULE MOOO mr ocom XJ BODY TO IGNITION SWITCH FUEL PUMP RELAY BR PUMP 85 RELAY CONTROL DRAG FUEL LEVEL SENSOR SIGNAL D SENSOR GROUND DB WT Fused Ign Sw Output DGWT 80b6f0ce Fuel Pump Relay Output FUEL PUMP RELAY POWERTRAIN CONTROL MODULE BR Fuel Pump Relay Control DB LG Fuel Level Sensor Signal BR YL Sensor Ground 80b6ef d4 Name of code Fuel Pump Relay Control Circuit When monitored With the ignition key on and battery voltage greater than 10 volts Set condition open or shorted condition is detected in the fuel pump relay control circuit Theory of operation fuel pump relay controls the 12 volt source to the fuel pump The relay is located in the power distribution center PDC One side of the relay control coil is supplied with 12 volts when the ignition switch is turned to the position The circuit is completed when the other side of the relay coil is grounded by the powertrain control module The PCM grounds the relay when the ignition switch is in either the run or crank position and engine RPM is detected If engine RPM is not detected the PCM will remove the fuel pump r
74. Relay Output MOOO mr uUuco Sensor Ground BK DG IGNITION COILS Upstream Oxygen GENERATOR AND Sensor Signal INJECTORS UPSTREAM OXYGEN SENSOR 805118 1 XJ BODY POWERTRAIN CONTROL MODULE TN WT ASD RELAY Downstream Oxygen Sensor signal DOWNSTREAM OXYGEN SENSOR DGAWT ASD Relay Output Sensor Ground TO BK DG IGNITION COILS Upstream Oxygen GENERATOR AND Sensor Signal 7 INJECTORS UPSTREAM OXYGEN SENSOR 80b118a2 TEST 118 REPAIRING FUEL SYSTEM RICH 1 1 RICH Perform TEST TC 118A Before Proceeding Using the test schematic as a guide make sure all the wiring and connectors are okay Perform each of the following tests in the order listed below If a test passes continue to the next until the problem is found Fuel Pressure TEST NTC 5A Coolant Temperature Sensor TEST NTC 6A Throttle Position Sensor TEST NTC 7A MAP Sensor TEST NTC 8A Engine Mechanical Systems TEST NTC 13A Evaporative Emission Sensor TEST NTC 17A 221 0 MOOO CC TEST 119 REPAIRING FUEL SYSTEM LEAN 1 1 LEAN Perform TEST DTC Before Proceeding Name of Code Fuel System Lean When monitored With the engine running in closed mode and the ambient battery temperature above 20 F and altitude lt 8000 ft MOOO CC Set condition The conducts test to determine whether the fuel system running too lean If this happens f
75. S C VACUUM SOLENOID CONTROL S C VENT SOLENOID CONTROL S C BRAKE SWITCH OUTPUT GROUND 80004664 XJ BODY BRAKE LAMP SWITCH CONNECTOR BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY 5 BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED FUNCTION 1 80b04fe6 XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND S C VACUUM SOLENOID CONTROL S C VENT SOLENOID S C POWER SUPPLY BRAKE SWITCH SENSE S C SWITCH SIGNAL BRAKE LAMP SWITCH CONNECTOR FUNCTION BRAKE SWITCH SENSE GROUND S C POWER SUPPLY S C BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED 80ab5ce9 TEST 82 Perform TEST DTC Before Proceeding START TEST 82 REPAIRING SPEED CONTROL POWER RELAY SPEED CONTROL 12V DRIVER CIRCUIT DISCONNECT THE SPEED CONTROL SERVO CONNECTOR USE A VOLTMETER IN THE FOLLOWING STEPS gt DEPRESSED DURING THE NOTE ENSURE THE BRAKE PEDAL IS NOT FOLLOWING STEPS KEY ON ENGINE OFF USING THE DRB ACTUATE THE S C POWER RELAY USING A VOLTMETER MEASURE THE S C BRAKE SWITCH OUTPUT CIRCUIT FIG 1 DOES THE VOLTAGE CYCLE FROM 0 TO 12 VOLTS gt 5 82 KEY OFF USING OHMMETER MEASURE RESISTANCE OF THE S C BRAKE SWITCH OUTPUT CIRCUIT BETWEEN THE SERV
76. 0 MOOO CC Perform Verification TEST VER 2A Check connectors Clean repair as necessary 205 0 MOOO 22 TEST 114 REPAIRING P N SWITCH STUCK PARK OR GEAR Perform TEST DTC Before Proceeding XJ BODY 2 5L TO STARTER RELAY BK WT P N Position POWERTRAIN CONTROL MODULE P N POSITION SWITCH BR LG Back Up Lamps Feed 9 WT TO FUSED IGNITION SWITCH OUTPUT 80061046 4 01 FUSED IGN SW TRANSMISSION OUTPUT RANGE PCM SENSOR TRS 1 2 SENSE TRS 3 SENSE TRS OD SENSE TRS R SENSE TO BACKUP LAMPS Switch Sense TO STARTER RELAY SS 80b76ec8 TJ BODY 2 5L AND 4 0L TO STARTER RELAY POWERTRAIN CONTROL MODULE P N POSITION BR LB SWITCH P N Position 6 Switch Sense VT BK Back Up Lamps Feed VT WT TO FUSED IGNITION SWITCH OUTPUT 80b11885 Name of code Park Neutral Switch Failure Sense Circuit When monitored With the transmission in park neutral or drive and not in limp in mode Set condition This code is set if the PCM detects an incorrect park neutral switch state for a given mode of vehicle operation Theory of operation The park neutral position switch is used to communicate whether or not the transmission is in park or neutral to the PCM When the transmission is in park or neutral the park neutral position switch sense circuit is grounded Probable ca
77. CKP AND CMP CONNECTORS START THE ENGINE AND LET IT IDLE WITH THE DRB MONITOR THE RPM WHILE WIGGLING CMP amp CKP HARNESS WIRING DOES THE ENGINE SPEED CHANGE WHEN WIGGLING THE WIRE HARNESS I 39 NOTE WHERE WIGGLING WIRES CAUSED A ENG SPEED CHANGE amp REPAIR WIRE HARNESS AS NECESSARY NO PROBLEM HAS BEEN FOUND DO YOU WANT TO WIGGLE ANOTHER WIRE HARNESS SECTION NO THE CONDITION REQUIRED TO SET THE TROUBLE CODE IS NOT PRESENT FIG 1 REFER TO GENERAL INFO 3 3 2 FOR INFORMATION ON INACTIVE TROUBLE CODES gt TEST COMPLETE 0 MOOO 0 0 70 Perform Verification TEST VER 2A Check connectors Clean repair as necessary 279 TEST 157 REPAIRING INTERMITTENT LOSS OF OR Perform TEST TC 157A Before Proceeding TYPICAL DISTRIBUTOR CAP 0 MOOO CC M 1070304 CRANKSHAFT POWERTRAIN SENSOR AND position CONTROL MAP SENSOR SENSOR MODULE GY BK Sensor Signal OR 5 Volt Supply TN YL CMP Sensor Signal CAMSHAFT POSITION SENSOR BR YL Sensor Ground TO OTHER SENSORS 80a4ef 4 5 5 157 DISTRIBUTOR 1 INSPECT THE ROTOR AND ROTOR DRIVE SYSTEM FOR LOOSENESS PER SERVICE MAN
78. CONNECTOR XJ 2 5L A T CAV COLOR FUNCTION 1 2 WT FUSED IGNITION SWITC 4 OUTPUT BK WT PARK NEUTRAL POSITION SW SENSE BR LG BACK UP LAMPS FEED TJ 2 5L AND 4 0L A T AV COLOR FUNCTION 1 FUSED IGNITION SWITCH OUTPUT 2 3 5 BR LB PARK NEUTRAL POSITION SW SENSE VT BK BACK UP LAMPS FEED FIG 1 80b7Gec8 384 TEST 20 CHECKING THE PARK NEUTRAL POSITION SWITCH Perform TEST NTC 21A Before Proceeding START TEST NTC 20B WITH THE DRB READ THE PARK NEUTRAL SWITCH INPUT STATE WHILE MOVING GEAR SELECTOR THROUGH ALL GEAR POSITIONS WATCH THE DRB DISPLAY _ DID THE DRB DISPLAY P N AND D R DOES THE PARK NEUTRAL SWITCH INPUT DISPLAY P N ONLY PARK NEUTRAL POSITION SWITCH TEST PASSED CONTINUE TEST gt NTC 20B ON THE NEXT PAGE DISCONNECT THE TRANS RANGE SENSOR HARNESS CONNECTOR MONITOR THE PARK NEUTRAL SWITCH INPUT STATE ON THE DRB DOES THE DRB DISPLAY D R REPLACE THE TRANSMISSION RANGE SENSOR TURN THE IGNITION OFF DISCONNECT THE THE POWERTRAIN CONTROL MODULE HARNESS CONNECTOR USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE RESISTANCE OF THE P N POSITION SW SENSE CIRCUIT TO GROUND FIG 1 IS THE RESISTANCE BELOW 5
79. GND CKT FIG 1 OR 2 USING THE DRB READ THE FUEL LEVEL SENDING UNIT VOLTAGE REPLACE THE FUEL PUMP MODULE MOVE THE JUMPER WIRE FROM THE SENSOR GROUND TO A KNOWN GOOD GROUND FIG 1 OR 2 USING THE DRB READ THE FUEL LEVEL SENDING UNIT VOLTAGE REPAIR THE SENSOR GROUND CIRCUIT FOR AN OPEN CONTINUE TEST gt 150 ON THE NEXT PAGE MOOO mr oUco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 251 TEST 150 CONTINUED REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO HIGH TJ BODY POWERTRAIN CONTROL MODULE GREY CONNECTORS 4 BR YL SENSOR GROUND C19 BR FUEL PUMP RELAY CONTROL C26 DE LG FUEL LEVEL SENSOR SIGNAL Qo 0m MOOO mr oUuco FUEL PUMP CONNECTOR FUEL PUMP RELAY OUTPUT FUEL LEVEL SENSOR SIGNAL GAUGE GROUND GAUGE GROUND PUMP 80b76eee POWERTRAIN CONTROL MODULE GREY CONNECTORS A4 BR YL SENSOR GROUND C19 BR FUEL PUMP RELAY CONTROL DB LG FUEL LEVEL SENSOR SIGNAL FUEL PUMP CONNECTOR FUEL PUMP RELAY OUTPUT FUEL LEVEL SENSOR SIGNAL GAUGE GROUND GAUGE GROUND PUMP 80b 76210 TEST 150 CONTINUED REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO HIGH TEST 150 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS gt
80. GREY CONNECTOR COLOR FUNCTION DB OR A C CMP CLUTCH RELAY CONTROL FIG 2 80676895 80076097 5 16 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE A C CLUTCH RELAY KEY ON USING A VOLTMETER MEASURE THE FUSED IGN SWITCH OUTPUT FIG 1 OR 2 EST TC 16A CONTINUED REPAIRING A C CLUTCH RELAY CIRCUIT 15 ABOVE 10 0 VOLTS REPAIR THE FUSED IGNITION SWITCH OUTPUT CIRCUIT FOR AN OPEN 3 KEY OFF USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE RESISTANCE BETWEEN TERMINALS 85 AND 86 OF THE A C CLUTCH RELAY FIG 3 IS THE RESISTANCE BETWEEN 70 AND 90 OHMS REPLACE THE A C CLUTCH RELAY KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS zi l USING AN OHMMETER MEASURE THE A C CLUTCH CONTROL CKT AT PCM TO GROUND FIG 1 OR 2 l IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE A C CLUTCH RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND USING AN OHMMETER MEASURE THE RESISTANCE OF THE A C CLUTCH RELAY CONTROL CIRCUIT BEWTEEN THE RELAY AND THE PCM FIG 1 OR 2 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE A C CLUTCH RELAY CONTROL CIRCUIT FOR AN OPEN
81. GROUND 2 RDAG SPEED CONTROL SIGNAL BOab3724 414 TEST 5 2 5 5 2 THE PREVIOUS PAGE DISCONNECT THE SPEED CONTROL ON OFF SET SWITCH CONTINUED CHECKING SPEED CONTROL ON OFF SWITCH KEY ON USING A VOLTMETER MEASURE THE VOLTAGE OF THE S C SWITCH SIGNAL CIRCUIT FROM THE S C SWITCH CONNECTOR TO A GOOD GROUND FIG 1 IS VOLTAGE ABOVE 6 0 VOLTS REPAIR THE S C SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE TURN THE IGNITION OFF WAIT ONE WAIT USING AN OHMMETER MEASURE THE SENSOR GROUND CKT TO GROUND FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN SENSOR GROUND CIRCUIT CONNECT A JUMPER BETWEEN THE S C SW SIGNAL AND GROUND FIG 1 KEY ON WITH THE DRB READ THE S C SW VOLTAGE DOES THE DRB DISPLAY S C SWITCH IS LESS THAN 1 0 VOLT REPLACE THE SPEED CONTROL ON OFF SET SWITCH REPLACE THE POWERTRAIN CONTROL MODULE rOx34zoo Perform Verification TEST VER 4A Check connectors Clean repair as necessary 415 TEST SC 3A CHECKING THE SPEED CONTROL RESUME SWITCH Perform TEST SC 1A Before Proceeding CONTROL POWERTRAIN 1 ILEF CONTROL L SEIT _JSIDE MODULE BR YL SENSOR GRCUND RD LG
82. IGNITION COIL DRIVER FROM PCM TO COIL CONNECTOR FOR AN OPEN 3 CHECK VALVE TIMING REFER TO APPLICABLE SERVICE MANUAL IS VALVE TIMING WITHIN SPECIFICATIONS REPAIR THE ENGINE VALVE TIMING AS NECESSARY REPLACE THE POWERTRAIN CONTROL MODULE 3 40 OZ Perform Verification TEST VER 1A Check connectors Clean repair as necessary 441 gt 10 OZ TEST 5 2 CHECKING THE FUEL SYSTEM Perform TEST NS SEL Before Proceeding TEST NS 2A CHECKING THE FUEL SYSTEM Perform TEST NS SEL Before Proceeding ENSURE THE REPAIR THE START TEST THROTTLE CABLE IS IS THE THROTTLE CONDITION THAT NS 2A NOT HOLDING THE BEING HELD OPEN BY 3 HOLDING THE THROTTLE OPEN THE CABLE THROTTLE OPEN USING THE DRB GO DOES THE DRB INTO ENGINE AND DISPLAY VEH THEFT CONTINUE TEST SELECT MONITORED SECURITY FUEL gt NS 2A ON THE DISPLAY NO START ON NEXT PAGE REFER TO THE SKIS SECTION IN THIS MANUAL AND PERFORM TEST SK 1A Perform Verification TEST VER 1A Check connectors Clean repair as necessary 443 3 40 OZ o gt o W 2 LL W I 2 x o I a gt o TEST NS 2A ZO TEST 2
83. IS THE ENGINE SPEED 900 100 RPM CONTINUE TEST TC 25A ON THE NEXT PAGE c gt AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS gt WERE PROBLEMS FOUND REPAIR AS NECESSARY START ENGINE WITH THE DRB IN SYSTEMS TESTS PERFORM THE IAC WIGGLE TEST THE IDLE SPEED SHOULD RAISE AND LOWER WITH THE DISPLAY gt DOES THE IDLE SPEED RAISE AND LOWER PROPERLY CONTINUE TEST TC 25A ON THE NEXT PAGE WIGGLE THE WIRING HARNESS FROM THE IAC MOTOR TO THE PCM OBSERVE FOR THE IAC MOTOR TO STOP OPERATING DID THE IAC STOP OPERATING AT ANY TIME REPAIR THE HARNESS gt NECESSARY WITH THE DRB STOP THE IAC WIGGLE TEST REFER TO GEN INFO 3 3 2 FOR INFORMATION ON INACTIVE TROUBLE CODES TEST COMPLETE Perform Verification TEST VER 2A Check connectors Clean repair as necessary MOOO mr oUuco TEST 25 CONTINUED REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS TJ XJ BODY IDLE AIR CONTROL MOTOR CONNECTOR MOOO mr uUuco VT BK AIR CONTROL 1 DRIVER IDLE AIR CONTROL 2 DRIVER YL BK IDLE AIR CONTROL
84. IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SPEED CONTROL SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND USING AN OHMMETER MEASURE THE RESISTANCE OF THE S C SWITCH SIGNAL SIGNAL CKT FIG 2 IS THE RESISTANCE BELOW 5 0 OHMS gt THE SPEED CONTROL SWITCH SIGNAL CIRCUIT TURN THE IGNITION OFF WAIT ONE MINUTE USING OHMMETER MEASURE BETWEEN THE S C SWITCH SIGNAL CKT AND SENSOR GROUND FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS gt REPAIR THE SPEED CONTROL SWITCH SIGNAL CKT SHORTED TO THE SENSOR GROUND CKT Perform Verification TEST VER 4A Check connectors Clean repair as necessary 413 L REPLACE THE POWERTRAIN CONTROL MODULE 9 0 1204200 TEST 5 2 CONTINUED CHECKING SPEED CONTROL ON OFF SWITCH TJ XJ BODY SPEED CONTROL POWERTRAIN 7 Ver CONTROL L SEIT _JSIDE MODULE BR YL SENSOR GRCUND RD LG ENN SPEED CONTROL SW SIGNAL YL RD 12 VOLT SUPPLY WT PK BRAKE SWITCH SENSE bui SOLENOIDS S C VAC SOL CONTROL DB RD LG RD S C BRAKE BRAKE VENT SOL CONTROL S C SOL CONTRO OUTPUT 0 400 4 c TO 80b089e0 SPEED CONTROL SWITCH CONNECTOR CAV 1
85. MODUL Fused Ign Sw Output TCC Solensid Relay Control TJ XJ BODY WITH 3 4070105 SPD AUTO TRANS TORQUE CONVERTER CLUTCH SOLENOID CONNECTOR TJ XJ BODY WITH 3 SPD AUTO TRANS FUNCTION FUSED IGNITION SWITCH OUTPUT TJ ALL A T FUSED IGNITION SWITCH OUTPUT XJ 2 5L A T SOLENOID CONTROL TJ ALL A T TCC SOLENOID CONTROL XJ 2 5L A T 80b76f2b POWERTRAIN CONTROL MODULE CONNECTORS B11 OR LG TCC SOLENOID CONTROL ALL B11 OR BK TCC SOLENOID CONTROL XJ 2 5L A T TORQUE CONVERTER CLUTCH SOLENOID CONNECTOR A A B B RD LG FUSED IGNITION SWITCH OUTPUT TJ ALL WT FUSED IGNITION SWITCH OUTPUT XJ 2 5L A T TCC SOLENOID CONTROL TJ ALL A T SOLENOID CONTROL XJ 2 5L 800601 12 REPAIRING TORQUE CONVERTER CLUTCH TRANS RELAY TJ XJ BODY WITH 3SPD AUTO TRANS START TEST 12 Perform TEST DTC Before Proceeding IS THIS VEHICLE EQUIPPED WITH A 4 SPEED AISIN TRANSMISSIONS REFER THE APPORPERITE TRANSMISSION DIAGNOSTIC MANUAL DISCONNECT THE TORQUE CONVERTER CLUTCH CONNECTOR MEASURE THE VOLTAGE AT THE FUSED IGNITION SWITCH OUTPUT CIRCUIT FIG 1 IS THE VOLTAGE BELOW 10 0 VOLTS R
86. MODULE ANTENNA TRANSPONDER CHIP IN KEY CEO PDC 4 10 AMP Fused WT BK Fused Ign Switch Output Run Start WT BK CCD BUS VT BR CCD BUS BK LG Ground PDC JUNCTION BLOCK 10 AMP 6 JUNCTION BLOCK TO OTHER MODULES BK LG Ground TRANSPONDER MOLDED CAP REMOVED SENTRY KEY 8066092 80666145 TEST SK 6A REPAIRING TRANSPONDER CRC CYCLIC REDUNDANCY CHECK FAILURE Perform TEST SK 1A Before Proceeding START TEST SK 6A TURN IGNITION OFF USING THE DRB DOES THE DRB CONTINUE TEST WAIT 10 SECONDS READ CODES gt DISPLAY THIS CODE gt SK 6 ON THE TURN IGNITION ON NEXT PAGE 5 USING THE CONDITION REQUIRED SCHEMATIC AS A WERE ANY PROBLEMS REPAIR AS SET THE CODE IS gt GUIDE INSPECT THE FOUND NECESSARY NOT PRESENT WIRING AND 1 CONNECTORS REFER GENERAL INFORMATION 3 3 2 FOR ADDITIONAL TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 1A Check connectors Clean repair as necessary 327 lt MA zmo lt mN r uozzz TEST 5 CONTINUED REPAIRING TRANSPONDER CRC CYCLIC REDUNDANCY CHECK FAILURE L MOLDED TRANSPONDER 7 ezm o o
87. OVER 5 0 VOLTS AT ANY TIME gt PERFORM TEST 25 gt CONTINUE TEST TC 25A ON THE NEXT PAGE Check connectors Clean repair as necessary MOOO mr oUco TEST 25 CONTINUED REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS TJ XJ BODY IDLE AIR CONTROL MOTOR CONNECTOR MOOO mr uUuco VT BK AIR CONTROL 1 DRIVER IDLE AIR CONTROL 2 DRIVER YL BK IDLE AIR CONTROL 3 DRIVER GY RD IDLE AIR CONTROL 4 DRIVER amp 0b898b2 POWERTRAIN CONTROL MODULE VB A20 IAC MOTOR DRIVER 4 BR WT IAC MOTOR DRIVER 3 E YL BK 8 IAC MOTOR DRIVER 2 GY RD 19 IAC MOTOR DRIVER 1 IDLE AIR CONTROL MOTOR 80b6f0d8 5 25 CONTINUED FROM THE PREVIOUS PAGE EST TC 25A CONTINUED REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS KEY OFF DISCONNECT THE POWERTRAIN CONTROL MODULE HARNESS CONNECTOR gt IS ANY TERMINAL DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY THE FOLLOWING STEPS ARE CHECKING FOR A SHORT BETWEEN THE DRIVER CIRCUITS USING OHMMETER MEASURE THE RESISTANCE BETWEEN THE 1 DRIVER AND 2 3 4 DRIVERS gt IS THE RESISTANCE BELOW 5 0 OHMS ON ANY OF THE DRIVERS REPAIR THE IAC DRIVER CIRCUITS SHORTED TOGETHER USING AN
88. PAGE THROTTLE PLATE NOTE YOU MUST MOVE LINKAGE VERY IS THE VOLTAGE REPLACE THROTTLE SLOWLY WHILE CHANGE SMOOTH POSITION SENSOR LOOKING FOR A JUMP IN VOLTAGE WHILE MONITORING IS THE THROTTLE THE DRB OPEN THE POSITION SENSOR REPLACE THROTTLE THROTTLE PLATE TO VOLTAGE ABOVE 3 5 POSITION SENSOR WIDE OPEN VOLTS THROTTLE USING THE SCHEMATIC WHILE MONITORING AS A GUIDE WIGGLE THE DRB OBSERVE DID THE TP SENSOR REPAIR THE HARNESS THE TP SENSOR FOR THE TP SENSOR VOLTAGE CHANGE AT OR CONNECTORS AS HARNESS AND VOLTAGE TO CHANGE ANY TIME NECESSARY CONNECTORS TO PCM REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 2A Check connectors Clean repair as necessary 237 0 MOOO mr oUuco TEST 148 REPAIRING TORQUE CONVERTER CLUTCH RPM DROP LOCK UP BODY WITH 3 SPD AUTO TRANS Perform TEST DTC Before Proceeding TJ XJ BODY WITH 3 SPD AUTO TRANSMISSION Name of code Torq Clu No RPM Drop at Lockup When monitared When of the following steps are taken 1 None of the following matured or maturing trouble code conditions TOG solenoid circuit b Any cam crank related code c Vehicle speed signal d Any TPS related
89. PTU solenoid not securely connected or stuck Malfunctioning lock up valve in transmission Hydraulic leak at torque converter lock up clutch Worn out friction material on friction disc in torque converter Failed gear box or differential Powertrain contral module failure Worn out connector terminals wires gt gt gt gt gt gt gt gt gt gt gt 3380104 TJ XJ BODY WITH 3 SPD AUTO TRANSMISSION POWERTRAIN TORQUE CONTROL MODULE CONVERTER CLUTCH Fuseo Ign Sw Output SOLENOID TCC Solenoid Relay Control 4070105 238 TEST 148 Perform TEST DTC Before Proceeding START TEST TC 148A Perform Verification TEST VER 2A REPAIRING TORQUE CONVERTER CLUTCH NO RPM DROP AT LOCK UP BODY WITH 3 SPD AUTO TRANS USING THE DRB READ THE TROUBLE CODES IS THE THROTTLE POSITION SENSOR VOLTAGE TOO LOW CODE SET L 3 PERFORM TEST TC 26A Check connectors Clean repair as necessary 239 IS THE THROTTLE POSITION SENSOR VOLTAGE TOO HIGH CODE SET gt 5 27 IS THE PCM FAILURE EEPROM WRITE DENIED CODE SET gt PERFORM TEST TC 49A IS THE TORQUE CONVERTER CLUTCH SOLENOID TROUBLE CODE PRESENT lt A PERFORM TEST 12 15 REFERENCE SIGNAL AT PCM TROUBLE CODE PRESENT PERFORM
90. STARTER RELAY OUTPUT TEST 9 Perform TEST NS 9A Before Proceeding START TEST NS 9B REPAIRING A NO CRANK CONDITION DISCONNECT THE STARTER RELAY WITH AN OHMMETER MEASURE THE STARTER RELAY P N SENSE CIRCUIT FIG 1 OR 2 IS THE RESISTANCE ABOVE 5 0 OHMS gt STARTER RELAY GROUND CIRCUIT WITH A VOLTMETER MEASURE THE FUSED B CIRCUIT FIG 1 OR 2 IS THE VOLTAGE ABOVE 10 0 VOLTS REPAIR OPEN FUSED B CIRCUIT WITH A VOLTMETER MEASURE THE IGNITION SWITCH OUTPUT CIRCUIT FIG 1 OR 2 WHILE OBSERVING VOLTMETER HOLD gt IGNITION KEY IN THE RUN POSITION AND DEPRESS CLUTCH PEDAL IS THE VOLTAGE ABOVE 10 0 VOLTS IGNITION SWITCH OUTPUT CKT WARNING THE TRANS MUST BE IN NEUTRAL AND THE PARKING BRAKE MUST BE ON FOR THE NEXT STEP WARNING THE ENGINE MAY BE CRANKED IN gt THE NEXT STEP KEEP AWAY FROM MOVING ENGINE PARTS BRIEFLY CONNECT A JUMPER WIRE BETWEEN PERFORM TEST OAYOMaA gt 10 OZ KEY OFF 6 gt STARTER RLY AND gt NS 9C OUTPUT CKTS FIG 10R 2 Perform Verification TEST VER 1A Check connectors Clean repair as necessary 48
91. This will direct you to the specific test s that must be performed 3 3 1 Hard Code Adiagnostic trouble code that returns within one cycle of the required parameters is a hard code This means that the defect is there every time the powertrain control module checks that circuit or function Procedures in this manual verify if the trouble code is a hard code at the beginning of each test When it is not a hard code an intermittent test must be performed 3 3 2 Intermittent Code A diagnostic trouble code that is not there every time the powertrain control module checks the circuit is an intermittent code Most intermittent codes are caused by wiring or connector problems Defects that come and go like this are the most difficult to diagnose they must be looked for under specific conditions that cause them The following checks may assist you in identifying a possible intermittent problem e Visually inspect related wire harness connectors Look for broken bent pushed out or corroded terminals e Visually inspect the related harnesses Look for chafed pierced or partially broken wire Refer to any hotlines or technical service bulletins that may apply 3 3 3 Reset Counter The reset counter counts the number or times the vehicle has been started since codes were last set erased or the battery was disconnected The reset counter will count up to 255 start counts The number of starts helps determine when the tr
92. XJ BODY POWER DISTRIBUTION CENTER A G CLUTCH foams RELAY CONNECTOR COLOR FUNCTION RD BK DB BK DB OR DB WT FUSED B CLUTCH RELAY OUTPUT CLUTCH RELAY CONTROL FUSED IGNITION SWITCH OUTPUT FIG 3 80b6f de 396 EST 26 CHECKING THE A C SYSTEM Perform TEST NTC 1A Before Proceeding START TEST 26 5 CLUTCH RELAY FAULT CODE gt VERIFY THAT THE REFRIGERANT SYSTEM IS PROPERLY CHARGED PER SERVICE MANUAL SECTION 24 PERFORM TEST 16 IS THE REFRIGERANT SYSTEM PROPERLY CHARGED PROPERLY CHARGE THE REFRIGERANT SYSTEM PER THE SERVICE MANUAL SECTION 24 USING THE DRB ACTUATE THE A C CLUTCH RELAY DID THE A C CLUTCH ACTUATE c gt THE A C CLUTCH CHECKS OK AT THIS TIME DISCONNECT THE A C CLUTCH CONNECTOR WITH A VOLTMETER MEASURE THE A C FIG 1 CLUTCH RELAY OUTPUT AT THE A C CLUTCH CONN NOTE ACTUATION SHOULD STILL BE RUNNING DOES THE VOLTAGE SWITCH FROM 0 TO 12 VOLTS REPLACE THE CLUTCH COIL REMOVE THE A C CLUTCH RELAY WITH A VOLTMETER MEASURE FUSED B AT THE RELAY FIG 2 OR
93. 2 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GEN INFO 3 3 2 FOR INFORMATION ON INACTIVE TROUBLE CODES gt TEST COMPLETE 0 MOOO mr oUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 135 MOOO mr uUuco TEST TC 36A REPAIRING MAP SENSOR VOLTAGE LOW NO 5 VOLTS TO ENSOR TJ XJ BODY MAP SENSOR CONNECTOR 5 VOLT SUPPLY DG RD SENSOR SIGNAL SENSOR GROUND 808919155 TEST 36 SENSOR TEST TC 36A CONTINUED FROM THE PREVIOUS PAGE TURN ENGINE OFF AND IGNITION ON IF ENGINE IS RUNNING DISCONNECT THE MAP SENSOR HARNESS CONNECTOR USING A VOLTMETER MEASURE THE VOLTAGE OF THE MAP SENSOR 5 VOLT SUPPLY CIRCUIT AT THE MAP SENSOR CONNECTOR l IS THE VOLTAGE ABOVE 4 5 VOLTS CONTINUED REPAIRING MAP SENSOR VOLTAGE TOO LOW NO 5 VOLTS TO MAP CONTINUE TEST gt TC 36A THE NEXT PAGE USE THE DRB TO READ THE MAP SENSOR VOLTAGE IS THE MAP SENSOR VOLTAGE ABOVE 4 5 VOLTS REPLACE THE MAP SENSOR TURN IGNITION OFF DISCONNECT THE POWERTRAIN CONTROL MODULE HARNESS CONNECTO
94. 3 IS THE VOLTAGE ABOVE 11 0 VOLTS REPAIR THE OPEN FUSED B CLRCULT WITH AN OHMMETER MEASURE THE A C CLUTCH RELAY OUTPUT FROM THE RELAY TO THE A C CLUTCH COIL CONNECTOR IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN A C CLUTCH RELAY OUTPUT CIRCUIT Perform Verification TEST VER 2A Check connectors Clean repair as necessary 397 REPLACE THE CLUTCH RELAY MOOO mr ocozm4 oz MOOO mr ocozm oz TEST NTC 27A CHECKING THE RADIATOR FAN OPERATION Perform TEST NTC 1A Before Proceeding XJ BODY m P MINIFUSE RD _ LG RD Fused Ign B Fused Sw Output n Sue IGNITION SWITCH START RUN RADIATOR FAN RELAY POWERTRAIN CONTROL MODULE RADIATOR FAN DB PK LB BK Rad Fan Rad Fan Ground Relay Control Relay Control 8065093 XJ BODY RADIATOR FAN MOTOR CONNECTOR FUNCTION RADIATOR FAN RELAY OUTPUT GROUND FIG 1 80b6b3c0 XJ BODY POWER DISTRIBUTION CENTER Se RADIATOR FAN RELAY CONNECTOR Aan E roe LAM oo FUNCTION FUSED B FUSED IGNITION SWITCH OUTPUT RAD FAN RELAY CONTROL RAD FAN RELAY OUTPUT FIG 2 80b76e94
95. 3 DRIVER GY RD IDLE AIR CONTROL 4 DRIVER amp 0b898b2 POWERTRAIN CONTROL MODULE VB A20 IAC MOTOR DRIVER 4 BR WT IAC MOTOR DRIVER 3 E YL BK 8 IAC MOTOR DRIVER 2 GY RD 19 IAC MOTOR DRIVER 1 IDLE AIR CONTROL MOTOR 6 5 25 CONTINUED FROM THE PREVIOUS PAGE USING THE DRB STOP ALL TESTS TURN IGNITION OFF DISCONNECT IAC MOTOR HARNESS CONNECTOR EST TC 25A CONTINUED REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS USING AN OHMMETER MEASURE BETWEEN DRIVER 1 AND GROUND IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE IAC 1 DRIVER CIRCUIT SHORTED TO GROUND USING AN OHMMETER MEASURE BETWEEN DRIVER 2 AND GROUND gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE IAC 2 DRIVER CIRCUIT SHORTED TO GROUND USING AN OHMMETER MEASURE BETWEEN DRIVER 3 AND GROUND IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE IAC 3 DRIVER CIRCUIT SHORTED TO GROUND USING AN OHMMETER MEASURE BETWEEN IAC DRIVER 4 AND GROUND gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE IAC 4 DRIVER CIRCUIT SHORTED TO GROUND CONTINUE TEST gt TC 25A ON THE NEXT PA
96. 398 TEST 27 CHECKING THE RADIATOR OPERATION Perform TEST NTC 1A Before Proceeding n START TEST NTC 27A IS THERE RAD RELAY FAULT CODE PRESENT REPAIR THE RAD RELAY FAULT CODES USING THE DRB ACTUATE THE RAD FAN RELAY DID THE RAD FAN ACTUATE THE RAD FAN CHECKS OK AT THIS TIME KEY OFF REMOVE THE RADIATOR FAN HARNESS CONNECTOR KEY ON gt ACTUATE THE RAD USING A VOLTMETER MEASURE THE RAD FAN RELAY OUTPUT AT THE FAN FIG 1 DOES THE VOLTAGE CYCLE FROM 0 T012 VOLTS 5 27 THE RADIATOR RELAY XX KEY ON USING VOLTMETER MEASURE THE FUSED IGNITION SWITCH OUTPUT CKT AT THE RELAY FIG 2 IS THE VOLTAGE ABOVE 11 0 VOLTS FUSED IGNITION SWITCH OUTPUT CIRCUIT USING MEASURE THE RAD FAN RELAY OUTPUT FROM THE RELAY TO THE RAD FAN MOTOR FIG 1 AND 2 IS RES BELOW 5 STANCE 0 OHMS gt REPAIR THE OPEN RADIATOR FAN RELAY OUTPUT CIRCUIT REPLACE THE RADIATOR FAN RELAY
97. 4 54 fm PPh TT INTAKE MANIFOLD AIR TEMPERATURE SENSOR MAP SENSOR 80 289 XJ BODY EVAPORATIVE SOLENOID CONNECTOR 4 COLOR FUNCTION PK BK EVAP SOLENOID CONTROL 2 WT FUSE IGNITION SWITCH OUTPUT TJ XJ 2 51 IDLE AIR CONTROL et A M I me THROTTLE BODY MOUNTING TEN BOLTS 4 1 amp Gen Ki DI 2 M p is IDLE AIR ws CONTROL PASSAGE MAP INLET M SENSOR 80487223 TJ XJ BODY IDLE AIR CONTROL MOTOR CONNECTOR IDLE AIR CONTROL 1 DRIVER IDLE AIR CONTROL 2 DRIVER IDLE AIR CONTROL 3 DRIVER IDLE AIR CONTROL 4 DRIVER 80b898b2 gt 2 20 4 520 02 gt gt 20 4 5200 0 2 4 2 Controls amp Solenoids Continued TJ XJ 2 5L BODY TJ XJ 4 0L PRESSURE PRESSURE FUEL RAIL REGULATOR 1080405 REGULATOR 1080404 TJ XJ 2 5L TJ XJ 4 0L INJECTOR 1 INJECTOR 1 CONNECTOR CONNECTOR COLOR FUNCTION COLOR FUNCTION 1 DGAG ASD RELAY OUTPUT 1 DG LG ASD RELAY OUTPUT 1 DG OR ASD RELAY OUTPUT XJ 1 DG OR ASD RELAY OUTPUT XJ 2 WT DB INJECTOR 1 DRIVER 800560265 2 WT DG INJECTOR 1 DRIVER TJ XJ 2 51 TJ XJ 4 0L ELECTRICAL IGNITION COIL CONNECTOR SECONDARY CABLE 7 SECONDARY ELECTRICAL ______ GABLE MOUNTI
98. 4 01 PARK NEUTRAL POSITION SWITCH CONNECTOR XJ 2 5L A T CAV 1 WT FUSED IGNITION SWITC4 OUTPUT 2 PARK NEUTRAL POSITION SW SENSE 3 BR LG BAGK UP LAMPS FEED TJ 2 5L AND 4 0L A T AV 1 FUSED IGNITION SWITCH OUTPUT 2 BR LB PARK NEUTRAL POSITION SW SENSE 3 VI BK BACK UP LAMPS FEED 80 7 8 0 MOOO mr uUco 40L POWERTRAIN CONTROL MODULE BLACK CONNECTOR FUNCTION BK WT PARK NEUTRAL POSITION SWITCH SENSE TRANSMISSION ES RANGE SENSOR CONNECTOR 7 BK WT PARK NEUTRAL POSITION SWITCH SENSE 8 BK GROUND 830205735 5 114 CONTINUED FROM PREVIOUS PAGE MOVE THE GEAR SELECTOR TO THE PARK POSITION KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS XX y USE AN OHMMETER IN THE FOLLOWING STEP EST 114 CONTINUED REPAIRING P N SWITCH STUCK IN PARK OR IN GEAR MEASURE THE RESISTANCE BETWEEN THE P N SW SENSE CIRCUIT AT THE PCM AND GND FIG 1 OR 2 c gt OBSERVE OHMMETER DISPLAY WHILE MOVING GEAR SELECTOR FROM PARK TO REVERSE AND BACK TO PARK DID THE RESISTANCE CHANGE FROM BELOW 10 0 OHMS TO ABOVE 10 0 OHMS MODULE WAS THE RESISTANCE BELOW 10 0 OHMS AT ALL TIMES gt DISCONNECT THE P N POSITION SW CONNEC
99. 5A Before Proceeding START TEST TC 5B DISCONNECT THE GENERATOR FIELD DRIVER HARNESS CONNECTOR REPAIRING CHARGING SYSTEM VOLTAGE TOO LOW KEY ON USING A DRB ACTUATE THE GENERATOR FIELD USING A TEST LIGHT CONNECTED TO GROUND PROBE GENERATOR SOURCE CIRCUIT FIG 2 DOES THE TEST LIGHT ILLUMINATE REPAIR THE OPEN IN THE ASD RELAY OUTPUT CIRCUIT NOTE THE GENERATOR FIELD STILL ACTUATING USING A TEST LIGHT CONNECTED TO ra GENERATOR SOURCE CKT PROBE GEN FIELD DRV CKT FIG 2 DOES THE TEST LIGHT FLASH ON AND OFF REPAIR OR REPLACE THE GENERATOR AS NECESSARY DISCONNECT THE POWERTRAIN CONTROL MODULE HARNESS USING MEASURE RESISTANCE OF THE GENERATOR FIELD DRIVER CKT FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN IN THE GENERATOR FIELD DRIVER CIRCUIT REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO mr oUuco Perform Verification TEST VER 3A Check connectors Clean repair as necessary TEST TC 6A REPAIRING CHARGING SYSTEM VOLTAGE TOO HIGH Perform TEST DTC Before Proceeding TJ XJ BODY BK GY To USED POWERTRAIN BATTERY CONTROL MODULE DG OR GEN FIELD SOURCE RECTIFIER C25 GENERATOR
100. 7 ON THE TURN IGNITION ON NEXT PAGE 5 USING THE CONDITION REQUIRED SCHEMATIC AS A WERE ANY PROBLEMS REPAIR AS SET THE CODE IS gt GUIDE INSPECT THE FOUND NECESSARY NOT PRESENT WIRING AND 1 CONNECTORS REFER GENERAL INFORMATION 3 3 2 FOR ADDITIONAL TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 1A Check connectors Clean repair as necessary 331 lt MA lt 120 lt mN r uozzz TEST SK 7A CONTINUED REPAIRING TRANSPONDER ID MISMATCH L MOLDED TRANSPONDER 7 ezm o o DWMN r woss lt MA uUu zmo MOLDED CAP REMOVED SENTRY KEY 80b6h145 TEST SK 7A TEST SK 7A CONTINUED FROM THE PREVIOUS PAGE USING THE DRB ATTEMPT TO REPROGRAM THE IGNITION KEY TO THE SKIM MODULE SEE GENERAL INFO 8 0 CONTINUED REPAIRING TRANSPONDER ID MISMATCH USING THE DRB CLEAR CODES TURN IGNITION OFF WAIT 10 SECONDS TURN IGNITION ON AND CHECK CODES DOES THIS CODE SET TEST COMPLETE REPLACE IGNITION KEY WITH A KNOWN GOOD KEY USING THE DRB PROGRAM THE KNOWN gt GOOD IGNITION KEY THE SKIM MODULE SEE GENERAL INFO 8 0
101. 8 keys maximum 2 Using the DRB erase all ignition keys by selecting MISCELLANEOUS and ERASE ALL CURRENT IGN KEYS 3 Program all ignition keys Learned Key In Ignition Ignition key transponder ID is currently programmed in SKIM memory 9 0 SPECIFICATIONS 9 1 Fuel System Release Procedure Gasoline 1 Remove the fuel pump relay Start and run engine until it stalls Attempt to restart the engine until it will no longer run Ensure the ignition key is off Qu With fuel pressure relieved the fuel system can now be opened for required work Continue to use caution fuel leakage is still possible 494 O uU UC lt 2 0 2 18649408 p HOLIMS NOLLISOd Med 0000 Eon ena _ V319V15 T MEE am 4 11 EI j
102. B 80b6b36c TEST 11 CONTINUED REPAIRING GENERATOR FIELD SWITCHING PROPERLY TEST TC 11A USING THE DRB CONTINUED FROM STOP THE GENERATOR THE PREVIOUS FIELD DRIVER PAGE ACTUATION Vv KEY OFF DISCONNECT THE POWERTRAIN CONTROL MODULE MEASURE RESISTANCE REPAIR GENERATOR USE A OHMMETER IN OF THE GEN FIELD IS THE RESISTANCE FIELD DRIVER THE FOLLOWING gt DRIVER BETWEEN 3 BELOW 5 0 OHMS CIRCUIT FOR AN STEPS GEN FIELD CONN TO OPEN PCM CONN FIG 1 MEASURE RESISTANCE ACROSS THE GENERATOR IS THE RESISTANCE REPAIR OR REPLACE FIELD TERMINALS AT gt BELOW 5 0 OHMS THE GENERATOR AS GENERATOR NECESSARY FIG 2 MEASURE THE GEN REPAIR THE FIELD DRIVER CIRCUIT IS THE RESISTANCE GENERATOR FIELD AT GENERATOR HARNESS gt BELOW 5 0 OHMS DRIVER CIRCUIT FOR CONN TO GROUND A SHORT TO FIG 1 GROUND REPLACE THE POWERTRAIN CONTROL MODULE Perform Verification TEST VER 3A Check connectors Clean repair as necessary 0 MOOO mr oUuco MOOO mr uUco TEST TC 12A REPAIRING TORQUE CONVERTER CLUTCH TRANS RELAY CKT TJ XJ BODY WITH 3SPD AUTO TRANS Perform TEST DTC Before Proceeding TJ XJ BODY WITH 3 SPD AUTO TRANS WERTRAIN CONTR
103. B 4 SPEED CONTROL SERVO CONNECTOR FUNCTION S C VACUUM SOLENOID CONTROL S C VENT SOLENOID CONTROL S C BRAKE SWITCH OUTPUT GROUND 80609816 TEST TC 82B EE de SPEED CONTROL POWER RELAY SPEED CONTROL 12V DRIVER IRCUIT Perform TEST TC 82A Before Proceeding WITH AN OHMMETER START TEST MEASURE RESISTANCE 82 5 SWITCH OUTPUT FROM THE BRAKE REPAIR THE OPEN SWITCH CONNECTOR TO IS THE RESISTANCE S C BRAKE SWITCH S C SERVO CONNECTOR gt ABOVE 5 0 OHMS OUTPUT CIRCUIT FROM PCM TO S C FIG OR 2 SERVO USING SERVICE MANUAL PROCEDURE WAS THE BRAKE ADJUST THE BRAKE CHECK BRAKE SWITCH gt SWITCH ADJUSTMENT SWITCH ADJUSTMENT OK REPLACE THE BRAKE SWITCH Perform Verification TEST VER 4A Check connectors Clean repair as necessary 193 MOOO mr oUuco 0 MOOO 22 86 Perform TEST DTC Before Proceeding Name of Code Speed Control Switch Always High When monitored With the ignition key on Set condition An open condition is detected in the speed control on off switch circuit Theory of operation This circuit is monitored continuously by the PCM whenever the ignition is turned on The trouble code sets if the voltage in this circuit is above 4 7 volts for more than 1 second Possible
104. BR YL SENSOR GROUND 805005 9 80a5348d 14 TJ XJ BODY CRANKSHAFT POSITION SENSOR CONNECTOR 1070404 TJ XJ 2 51 amp 4 0L DISTRIBUTOR Tw EN 2 CAMSHAFT POSITION SENSOR CONNECTOR 1100106 TJ XJ 2 5L amp 4 0L THERMOSTAT HOUSING 1050203 TJ XJ BODY CRANKSHAFT POSITION SENSOR CONNECTOR 1 GY BK CRANKSHAFT POSITION SENSOR SIGNAL CAV COLOR FUNCTION 2 BR YL SENSOR GROUND 3 OR 5 VOLT SUPPLY TJ XJ BODY CAMSHAFT POSITION SENSOR CONNECTOR FUNCTION 80b0995b 1 TN YL CAMSHAFT POSITION SENSOR SIGNAL 2 BR YL SENSOR GROUND 3 OR 5 VOLT SUPPLY TJ BODY ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR 1 TN BK ECT SENSOR SIGNAL 2 BR YL SENSOR GROUND 80afbScc 80af 5a0 r JJmzmeao 2 0 4 520 2 gt gt gt 2 44 Sensors Continued XJ BODY ENGINE COOLANT TEMP SENSOR CONNECTOR COLOR FUNCTION 1 BR YL SENSOR GROUND 2 TN BK ECT SENSOR SIGNAL 80b098a7 TJ XJ 4 0L IDLE AIR CONTROL PASSAGE INLET IDLE AIR CONTROL MOTOR INTAKE MANIFOLD AIR TEMPERATURE SENSOR 80524 3 INTAKE AIR TEMPERATURE SENSOR CONNECTOR CAV COLOR FUNCTION 1 BR YL SENSOR GROUND 2 BK RD IAT SIGNAL 80b099c6 TJ XJ 2 5L IDLE AIR CONTROL MOTOR Y 9 THROTTLE BODY MOUNTING GON BOLT
105. BRIGHTLY REPAIR THE ASD RELAY OUTPUT CIRCUIT FOR AN OPEN KEY OFF DISCONNECT PCM HARNESS CONNECTOR USING AN OHMMETER MEASURE THE IGNITION COIL DRIVER CIRCUIT TO GROUND FIG 1 OR 2 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE IGNITION COIL DRIVER CIRCUIT FOR A SHORT TO GROUND USE AN OHMMETER IN THE FOLLOWING STEP RESISTANCE THE IGNITION COIL DRIVER CIRCUIT BETWEEN THE PCM AND THE IGNITION COIL FIG 3 OR 4 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE IGNITION COIL DRIVER CIRCUIT FOR AN USING AN OHMMETER MEASURE BETWEEN THE IGNITION COIL DRIVER CIRCUIT AND THE ASD RELAY OUTPUT CIRCUIT AT THE IGNITION COIL CONNECTOR FIG 1 OR 2 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE IGNITION COIL DRIVER SHORTED TO THE ASD RELAY OUTPUT CIRCUIT USE AN OHMMETER IN THE FOLLOWING STEP MEASURE ACROSS THE IGNITION COIL PRIMARY CIRCUIT FIG 5 IS THE RESISTANCE BELOW 2 0 OHMS REPLACE THE IGNITION COIL Perform Verification TEST VER 2A Check connectors Clean repair as necessary 159 REPLACE THE POWERTRAIN CONTROL MODULE 4 MOOO CC TEST 44 R
106. C12 DG PK ASD RELAY OUTPUT TJ C12 DG OR ASD RELAY XJ 80376688 12 TEST 70 REPAIRING INJECTOR 6 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding KEY OFF START TEST DISCONNECT THE 70 INJECTOR 6 CONNECTOR USING AN OHMMETER IS THE RESISTANCE REPLACE THE FUEL MEASURE RESISTANCE BETWEEN 10 0 AND INJECTOR OF INJECTOR 6 16 0 OHMS USING A TEST REPAIR THE ASD KEY ON USING THE LIGHT PROBE THE DOES THE TEST RELAY OUTPUT DRB ACTUATE AUTO ASD RELAY OUTPUT LIGHT ILLUMINATE CIRCUIT FOR AN SHUTDOWN RELAY CIRCUIT OPEN 1 WITH THE ASD RELAY BETWEEN THE REPAIR THE INJECTOR STILL ACTUATING INJECTOR HARNESS IS THE VOLTAGE 6 DRIVER CIRCUIT USING A VOLTMETER CONNECTOR AND ABOVE 1 0 VOLTS gt 5 MEASURE THE INJECTOR GROUND VOLTAGE IF OKAY DRIVER CIRCUIT FIG 1 REPLACE PCM KEY OFF USING AN OHMMETER REPAIR THE DISCONNECT THE PCM MEASURE THE IS THE RESISTANCE INJECTOR 6 DRIVER HARNESS INJECTOR 6 DRIVER BELOW 5 0 OHMS gt CIRCUIT FOR CONNECTORS CIRCUIT TO GROUND SHORT GROUND FIG 2 USING AN OHMMETER BETWEEN THE REPAIR THE MEASURE ACROSS THE POWERTRAIN CONTROL IS THE RESISTANCE INJECTOR 6 DRIVER INJECTOR 6 DRIVER MODULE AND T
107. C5 V35 LG RD 5 Vent Solenoid Control A16 K2 TN BK ECT Sensor Signal 611 V32 YL RD S C 12 Volt Supply 17 7 5 Volt Supply Primary C12 A142 DG OR ASD Relay Output 18 K44 TN YL CMP Sensor Signal C15 K118 PK YL Batt Temp Sensor Signal A19 K39 GY RD Idle Air Control 4 Driver C19 K31 BR Fuel Pump Ctrl A20 K59 VT BK Idle Air Control 1 Driver C20 K52 PK BK EVAP Sol Control A22 A61 DG BK Fused C22 C22 DB WT A C Pressure Switch Output A23 K22 OR DB TP Sensor Signal C23 C90 LG A C Select Input A24 41 BK DG O2 Sensor 1 1 Signal C24 29 WT PK Brake Switch Sense A25 K141 TN WT O2 Sensor 1 2 Signal C25 K72 DG OR Generator Field Source 4 A27 1 DG RD MAP Sensor Signal C26 K226DB LG Fuel Level Sensor A31 212 Ground C27 021 SCI Transmit A32 212 Ground C28 D2 WT BK CCD Bus B4 K11 WT DB Injector 1 Driver C29 D20 LG BK SCI Receive B5 K13 YL WT Injector 3 Driver C30 D1 VT BR CCD Bus B6 K15 PK BK Injector 5 Driver C32 V37 RD LG S C SW Signal 10 4 2 Controls amp Solenoids TJ BODY EVAPORATIVE SOLENOID p CONNECTOR 2 1 CAV COLOR FUNCTION 2 RD LG FUSED IGNITION SWITCH OUTPUT 80061082 TJ XJ BODY GENERATOR FIELD HARNESS GONNECTOR CAV COLOR FUNCTION 1 DG OR GENERATOR SOURCE 2 DG GENERATOR FIELD 80b6b12e TJ XJ 4 0L IDLE AIR CONTROL IDLE AIR PASSAGE INLET CONTROL MODULE 1 ee THROTTLE A POSITION 213 EA MOUNTING EA m 7 BOLTS
108. CLOCKWISE ROTATION 1040502 TEST 5 5 5 NS 3A INSPECT SPARK PLUG CABLES FOR CORRECT FIRING ORDER FIG 1 OR 2 CHECKING ENGINE MECHANICAL SYSTEMS Perform TEST NS SEL Before Proceeding ARE ALL SPARK PLUG CABLES POSITIONED CORRECTLY REINSTALL SPARK PLUG CABLES AS NECESSARY KEY OFF USING SERVICE MANUAL PROCEDURES CHECK VALVE TIMING IS VALVE TIMING WITHIN SPECIFICATIONS REPAIR THE ENGINE VALVE TIMING AS NECESSARY CHECK EXHAUST SYSTEM FOR ANY RESTRICTIONS IS THE EXHAUST FREE OF ANY RESTRICTIONS REPAIR AS NECESSARY REMOVE ASD RELAY REMOVE SPARK PLUGS USING SERVICE MANUAL PROCEDURES CHECK ENGINE COMPRESSION gt COMPRESSION WITHIN IS ENGINE SPECIFICATIONS REPAIR AS NECESSARY REPLACE POWERTRAIN CONTROL MODULE gt 10 OZ Perform Verification TEST VER 1A Check connectors Clean repair as necessary 447 gt 10 OZ TEST 4 REPAIRING LOW FUEL PRESSURE Perform TEST NS SEL Before Proceeding 4 5 5 NS 4A Perform Verification TEST VER 1A Check connectors Clean repair as necessary 449 REPAIRING LO
109. CONDITION PROBE FUSED CKT IN THE PCM CONNECTOR FIG 1 OR 2 gt IS THE VOLTAGE ABOVE 10 0 VOLTS gt REMOVE THE FUSE THE PDC THAT SUPPLIES FUSED B TO PCM CAVITY A22 FIG OR 2 INSPECT THE FUSE IS THE FUSE OK gt WITH A VOLTMETER MEASURE THE B SIDE OF THE FUSE SOCKET PERFORM TEST NS 6D CONTINUE TEST NS 6A ON THE NEXT PAGE IS THE VOLTAGE ABOVE 10 0 VOLTS REPAIR THE CIRCUIT FROM FUSE TO THE BATTERY FOR AN OPEN REPAIR THE FUSED CIRCUIT FROM FUSE TO PCM FOR AN OPEN gt 10 OZ Perform Verification TEST VER 1A Check connectors Clean repair as necessary 457 3 40 OZ TEST NS 6A CONTINUED REPAIRING NO RESPONSE CONDITION TJ BODY XJ BODY POWER DISTRIBUTION CENTER PDC POWER DISTRIBUTION RELAY SECTION d AUTO SHUTDOWN 0 055 0 amp 1 W
110. CONTINUE TEST gt TC 18A ON THE NEXT PAGE MOOO mr oUco Perform Verification TEST VER 2A Check connectors Clean repair as necessary TEST 18 CONTINUED REPAIRING PURGE SOLENOID CIRCUIT Name of code Evap Purge Solenoid Circuit When monitored At ignition key on and battery voltage greater than 10 4 volts Set condition After the arming conditions are satisfied not powering down not already in limp in time since the last solenoid activation gt 72 micro seconds The powertrain control module will set a trouble code if the actual state of the solenoid does not match the intended state 0 MOOO 22 Theory of operation Its purpose is to regulate by means of a duty cycle the flow of vapors from the evap canister to the throttle body The PCM controls the time the solenoid is on during a duty cycle During off idle operations higher flows higher percentages of duty cycle are used At idle lower flow lower percentages of duty cycle are used Possible causes Open or shorted control circuit Open fused ignition switch output circuit Open or shorted solenoid control coil Powertrain control module failure Connector terminals Connector wires 80aa0f82 TJ BODY XJ BODY reside POWERTRAIN CONTROL MODULE MODULE EVAP EVAP SOLENOID SOLENOID PK BK EVAP SOLENOID CONTROL Evap Solenoid Control RD WT FUSED IGNITION SWITCH OUTPUT Fused Igni
111. CONTINUED FROM THE PREVIOUS PAGE TURN IGNITION OFF CONTINUED REPAIRING PCM STATUS FAILURE USING THE SCHEMATIC AS A GUIDE INSPECT THE CCD BUS CIRCUITS BETWEEN THE PCM AND SKIM MODULE CHECK THE WIRING AND CONNECTORS FOR POOR TERMINAL CONTACT CORROSION OR DAMAGE ARE ANY OF THESE CONDITIONS PRESENT REPAIR AS NECESSARY REPLACE THE SKIM MODULE SEE GENERAL INFO 8 0 USING THE DRB ERASE CODES DRIVE VEHICLE PERFORM SEVERAL KEY CYCLES USING THE DRB CHECK CODES DOES THIS CODE APPEAR REPLACE THE POWERTRAIN CONTROL MODULE Perform Verification TEST VER 1A TEST COMPLETE Check connectors Clean repair as necessary 313 lt MA lt 120 lt JMN r e D I OH 2 2 lt MA lt 120 lt HPN sc E e D I OH S 2 TEST SK 3A REPAIRING ROLLING CODE FAILURE Perform TEST SK 1A Before Proceeding TJ BODY XJ BODY ANTENNA TRANSPONDER SENTRY KEY CHIP IMMOBILIZER IN KEY MODULE gie FUSE BLOCK FUSED SI 10 FUSE 4 FUSED IGN SWITCH OUTPUT RUN START IGNITION 10 AMP SWITCH WT BK CCD BUS R TO OTHER CCD BUS MODULES BK GROUND BK LB GROUND 80b6f0cc SENTRY KEY ANTENNA T
112. CONTROL MODULE BLACK CONNECTOR 10 YL BK IAC 3 DRIVER A11 IAC 2 DRIVER A19 GY RD IAG 4 DRIVER A20 IAC 1 DRIVER IDLE AIR CONTROL MOTOR CONNECTOR VII8 1 DRIVER BR WT IAC 2DRIVER YUBK IAC 3DRIVER GY RD IAC 4DRIVER MOOO mrwcoxwnnt oz 80b898b3 Theory of operation The idle air control motor is used by the PCM to help regulate idle speed The motor controls the amount of air allowed to bypass the throttle blade The PCM controls the motor using four driver circuits to position the stepper motor 2640605 5 5 NTC 12A EST NTC 12A CHECKING THE IDLE AIR CONTROL MOTOR Perform TEST NTC 1A Before Proceeding WITH THE DRB IN ACTUATOR TESTS SET ENGINE SPEED TO 1400 RPM IS THE ENGINE SPEED 1400 RPM 100 RPM gt WITH THE DRB STOP ALL TESTS IAC MOTOR IS OPERATING OK TEST PASSED WITH THE DRB STOP ALL TESTS INSPECT THE ENGINE FOR ANY VACUUM LEAK 5 IS THERE ANY VACUUM LEAKS REPAIR VACUUM LEAK S AS NECESSARY DISCONNECT THE IDLE AIR CONTROL MOTOR CONNECTOR DISCONNECT THE POWERTRAIN CONTROL MODULE HARNESS CONNECTOR DETERMINE IF AN OPEN CIRCUIT EXISTS BETWEEN IAC CONNECTOR 1 DRIVER amp PCM CONNECTOR 1 DRIVER DOE
113. DWMN r woss lt MA uUu zmo MOLDED CAP REMOVED SENTRY KEY 80b6h145 TEST SK 6A CONTINUED REPAIRING TRANSPONDER CRC CYCLIC REDUNDANCY CHECK FAILURE TEST 5 CONTINUED FROM THE PREVIOUS PAGE USING THE DRB ATTEMPT TO REPROGRAM THE IGNITION KEY TO THE SKIM MODULE SEE GENERAL INFO 8 0 USING THE DRB CLEAR CODES TURN IGNITION OFF WAIT 10 SECONDS TURN IGNITION ON AND CHECK CODES DOES THIS CODE SET TEST COMPLETE USING THE DRB PROGRAM THE KNOWN KEY WITH A KNOWN GOOD IGNITION KEY THE SKIM MODULE SEE GENERAL INFO 8 0 USING THE DRB CLEAR CODES TURN IGNITION OFF WAIT 10 SECONDS TURN IGNITION ON AND CHECK CODES DOES THIS CODE SET TEST COMPLETE Perform Verification TEST VER 1A REPLACE THE SKIM MODULE Check connectors Clean repair as necessary 329 lt MA lt 120 lt JMN r e D I OH 2 2 lt MA lt 120 lt JMN r e D I OH S 2 TEST SK 7A Perform TEST SK 1A Before Proceeding TJ BODY ANTENNA TRANSPONDER CHIP IN KEY cc FUSE BLOCK I P TN EK FUSE 1 FUSED SENTRY KEY IMMOBILIZER MODULE TO PDC P FUSE 4 10
114. FROM PREVIOUS PAGE DISCONNECT THE P N POSITION SW CONNECTOR TRANS RANGE SENSOR EST TC 114A CONTINUED REPAIRING P N SWITCH STUCK IN PARK OR GEAR MEASURE THE RESISTANCE OF THE P N SWITCH SENSE CIRCUIT BETWEEN THE PCM CONNECTOR AND THE P N SWITCH CONNECTOR FIG 1 OR 2 IS THE RESISTANCE BELOW 5 0 OHMS YES REPAIR THE OPEN P N SWITCH SENSE CIRCUIT V IS THIS VEHICLE EQUIPPED WITH A 4 SPEED AISIN TRANSMISSION REPLACE THE PARK NEUTRAL POSITION SWITCH OR TRANSMISSION RANGE SENSOR USING AN OHMMETER MEASURE THE GROUND CIRCUIT AT THE TRANS RANGE HARNESS CONNECTOR FIG 2 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN IN THE GROUND CIRCUIT REPLACE THE TRANSMISSION RANGE SENSOR MOOO mr oUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 211 0 MOOO 22 TEST 115 REPAIRING POWER STEERING SWITCH FAILURE Perform TEST DTC Before Proceeding 2 5L TJ XJ ERTRAIN DULE PIWPFR STFFERING PSESSJRE SWITCH Power Steering 4 Pressure Switch Sense 4070103 of code Power Steering Switch Failure When monitored Withthe ignition key on and engine runnin
115. LEVEL ABOVE 0 09 VOLTS SENSOR VOLTAGE m REPLACE THE FUEL LEVEL SENDING UNIT USING A JUMPER WIRE JUMPER THE FUEL LEVEL SENSOR SIGNAL CIRCUIT TO A GOOD GROUND FIG 1 OR 2 gt IS THE FUEL LEVEL ABOVE 0 09 VOLTS SENSOR VOLTAGE gt THE SENSOR GROUND CIRCUIT Po REPAIR THE OPEN IN THE FUEL LEVEL SENSOR SIGNAL CKT IF OK REPLACE PCM MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 395 Perform TEST 1 Before Proceeding TJ XJ BODY A C COMPRESSOR CLUTCH COIL CONNECTOR COLOR TEST NTC 26A CHECKING THE A C SYSTEM FUNCTION DB BK CMP CLUTCH RELAY OUTPUT OAOmMmMa MOOO mr ocozm oz TJ BODY A C CLUTCH RELAY FIG 1 80b09803 POWER DISTRIBUTION CENTER PDC RELAY SECTION C d FUNCTION RD GY F A G CMP CLUTCH RELAY OUTPUT FUSED IGNITION SWITCH OUTPUT CMP CLUTCH RELAY CONTROL USED B 4 8056108 2
116. MOOO CC 0 MOOO mr uUuco TEST TC 151A CONTINUED REPAIRING FUEL LEVEL SENDING UNIT SENDING UNIT NO CHANGE OVER TIME TJ BODY FUEL PUMP CONNECTOR COLOR FUNCTION FUEL PUMP RELAY OUTPUT FUEL LEVEL SENSOR SIGNAL BR YL SENSOR GROUND BK GROUND 8006028 TJ BODY POWERTRAIN CONTROL MODULE GREY CONNECTORS Function _______ 4 SENSOR GROUND C19 BR FUEL PUMP RELAY CONTROL C26 DB LG FUEL LEVEL SENSOR SIGNAL FUEL PUMP CONNECTOR coron Function 1 DG WT FUEL PUMP RELAY OUTPUT 3 DE LG FUEL LEVEL SENSOR SIGNAL GAUGE 4 BR YL GROUND GAUGE 6 BK GROUND PUMP 80076 256 XJ BODY FUEL PUMP MODULE CONNECTOR COLOR FUNCTION DG WT FUEL PUMP RELAY OUTPUT DB LG FUEL LEVEL SENSOR SIGNAL BR YL SENSOR GROUND GROUND 80 16 XJ BODY POWERTRAIN CONTROL MODULE GREY CONNECTORS Jooren FUNCTION ________ A4 BR YL SENSOR GROUND C19 BR FUEL PUMP RELAY CONTROL C26 DB LG FUEL LEVEL SENSOR SIGNAL FUEL PUMP CONNECTOR FUEL PUMP RELAY OUTPUT FUEL LEVEL SENSCR SIGNAL GAUGE GROUND GAUGE GROUND PUMP 80 76510 151 5 151 PREVIOUS PAGE DISCONNECT THE FUEL LEVEL SENDING UNIT HARNESS CONNECTOR USING THE DRB MONITOR THE FUEL LEVEL SENDING UNIT VOLTAGE IN THE
117. MOTOR MOOO mr uUuco B8 0b6f0d8 Name of code Idle Air Control Motor Circuits When monitored At key on and battery voltage greater than 11 5 volts Set condition The PCM senses a short to ground or battery voltage on any of the four IAC driver circuits for 2 75 seconds while the IAC motor is active Theory of operation The idle air control motor is used by the PCM to help regulate idle speed The motor controls the amount of air allowed to bypass the throttle blade The PCM controls the motor using four driver circuits to position the stepper motor Possible causes Driver circuit shorted to ground Driver circuit shorted to battery Driver circuits shorted together Failed PCM Shorted IAC motor Connector terminals Connector wires 80aadbal TEST 25 5 5 25 REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS Perform TEST DTC Before Proceeding TURN IGNITION OFF FOR 10 SECONDS START ENGINE ALLOW TO IDLE FOR 20 SECONDS NOTE IF ENGINE WILL NOT IDLE HOLD THROTTLE OPEN SLIGHTLY TO KEEP ENGINE RUNNING WITH THE DRB ACTUATE THE IDLE AIR CONTROL MOTOR TO 1400 RPM RELEASE THROTTLE IS THE ENGINE SPEED 1400 100 RPM CONTINUE TEST TC 25A ON THE NEXT PAGE I 9 YES WITH THE DRB ACTUATE THE IDLE AIR CONTROL MOTOR TO 900 RPM A
118. OR REPLACE THE SHORTED GENERATOR AS NECESSARY REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO CC Perform Verification TEST VER 3A Check connectors Clean repair as necessary 6 REPAIRING CHARGING SYSTEM VOLTAGE TOO HIGH Perform TEST TC 6A Before Proceeding TJ XJ BODY BK GY FUSED 86 POWERTRAIN BATTERY CONTROL MODULE 0 MOOO mr uUuco DG OR GEN FIELD SOURCE Se GENERATOR 810 GEN FIELD DRIVER TEST 6 5 5 TC 6B REPAIRING CHARGING SYSTEM VOLTAGE TOO HIGH Perform TEST TC 6A Before Proceeding WITH THE DRB STOP THE GENERATOR FIELD DRIVER ACTUATION READ THE TARGET CHARGING VOLTAGE IS THE TARGET CHARGING VOLTAGE ABOVE 13 0 VOLTS 4 CONTINUE TEST TC 6B ON THE NEXT PAGE USING THE DRB TEMP PROBE MEASURE TEMP NEAR AMBIENT BATT TEMP SENSOR WITH THE DRB READ THE BATTERY TEMP SENSOR TEMPERATURE IS THE BATTERY TEMPERATURE WITHIN 12 C 10 F OF THE UNDER HODD TEMPERATURE gt CONTINUE TEST TC 6B ON THE NEXT PAGE NO DISCONNECT THE AMBIENT BATTERY TEMP SENSOR HARNESS CONN AND INSPECT THE TERMINALS ARE ANY TERMINALS FOUND TO BE CORRODED DAMAGE PUSH OUT MISWIRED REPAI
119. OUTPUT SWITCH POWERTRAIN CONTROL MODULE FUEL PUMP RELAY BR PUMP RELAY CONTROL FUEL LEVEL SENSOR SIGNAL XJ BODY TO IGNITION SWITCH DG VIT Fuel Pump Relay Output FUEL PUMP RELAY POWERTRAIN CONTROL MODULE BR Fuel Pump Relay Control BR YL SLNSOR GROUND DBILG Fuel Level Sensor Signal TJ BODY FUEL PUMP CONNECTOR COLOR FUNCTION DG WT FUEL PUMP RELAY OUTPUT FUEL LEVEL SENSOR SIGNAL BR YL SENSOR GROUND BK GROUND BH YL Sensor Ground 80b6t0ce 80b6f0d4 XJ BODY FUEL PUMP MODULE CONNECTOR COLOR FUNCTION DG WT FUEL PUMP RELAY OUTPUT DB LG FUEL LEVEL SENSOR SIGNAL BR YL SENSOR GROUND 80 6 098 80aafal6 394 TEST 25 CHECKING THE FUEL LEVEL SENSOR Perform TEST NTC 1A Before Proceeding START TEST 25 DISCONNECT THE FUEL PUMP MODULE HARNESS CONNECTOR USING THE DRB READ THE FUEL LEVEL SENSOR VOLTAGE gt IS THE FUEL LEVEL ABOVE 9 9 VOLTS SENSOR VOLTAGE gt REPAIR THE FUEL LEVEL SENSOR SIGNAL CIRCUIT FOR RESISTANCE TO GROUND USING A JUMPER WIRE JUMPER THE FUEL LEVEL SENSOR SIGNAL CIRCUIT TO THE gt SENSOR GROUND CIRCUIT AT THE FUEL PUMP CONNECTOR FIG 1 OR 2 USING THE DRB READ FUEL LEVEL SENSOR VOLTAGE gt IS THE FUEL
120. RELAY SECTION STARTER RELAY 3 40 OZ FUNCTION FUSED B IGNITION SWITCH OUTPUT PARK NEUTRAL SWITCH SENSE AUTO TRANS GROUND MANUAL TRANS STARTER RELAY OUTPUT 8056107 XJ BODY POWER DISTRIBUTION CENTER PDC 2 STARTER RELAY RELAY SECTION CONNECTOR FUSED B P N POSITION SWITCH SENSE AUTO TRANSMISSION GROUND MANUAL TRANSMISSION FUSED IGNITION SWITCH OUTPUT STARTER RELAY OUTPUT TEST 9 Perform TEST NS SEL Before Proceeding 5 5 NS 9A REPAIRING A NO CRANK CONDITION 01 15 EQUIPPED WITH MANUAL TRANSMISSION PERFORM TEST NS 9B ENSURE THE TRANSMISSION IS IN PARK WITH DRB SELECT INPUTS OUTPUTS READ PARK NEUTRAL POSITION gt DOES THE DRB READ P N NOTE THE PARK NEUTRAL SWITCH SENSE CIRCUIT IS OPEN PERFORM TEST TC 114 DISCONNECT THE STARTER RELAY CONNECTOR gt WITH VOLTMETER MEASURE THE FUSED B CIRCUIT AT THE STARTER RELAY FIG 1 OR 2 IS THE VOLTAGE ABOVE 10 0 VOLTS gt REPAIR OPEN FUSED B CIRCUIT MEASURE THE IGNITION SWITCH OUTPUT CIR
121. SET THE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER INFO 3 3 2 INACTIVE TROUBLE CODES TEST COMPLETE 0 MOOO CC Perform Verification TEST VER 2A Check connectors Clean repair as necessary MOOO mr uUuco TEST REPAIRING CHARGING SYSTEM VOLTAGE TOO LOW Perform TEST DTC Before Proceeding Name of code Charging System Voltage Too Low When monitored With the ignition key on and the engine running over 1500 RPM after 25 seconds Set condition When the PCM regulates the generator field and there are no detected field problems but the voltage output does not increase Theory of operation The PCM tries to maintain a system voltage between 12 9 volts and 15 0 volts The voltage determined by the PCM as the final goal for the charging system is called control voltage This control voltage is determined from the battery temp sensor ambient sensor The control voltage is compared to the sensed voltage continuously during running The PCM controls battery voltage by energizing and de energizing the alternator field winding When the battery voltage falls below a setpoint voltage the generator field winding is energized until the battery voltag
122. TEST 40 gt 5 148 0 MOOO mr oUco TEST 148 CONTINUED REPAIRING TORQUE CONVERTER CLUTCH RPM DROP LOCK UP TJ XJ BODY WITH 3 SPD AUTO TRANS TJ XJ BODY WITH 3 SPD AUTO TRANSMISSION Name of code Torq Clu No RPM Drop at Lockup When monitared When all of the following steps are taken 1 None of the following matured or maturing trouble code conditions TOG solenoid circuit b Any cam crank related code c Vehicle speed signal d Any TPS related code Battery voltage gt 11 0 vols Vehicle speed lt 60 mph during step 5 Run vehicle in th rd gear at about 40 mph with torque converter unlocked for at least 10 seconds Apply 1 3 throttle while making sure transmission does not downshift Bac lt off on the throttle slightly unti the torque converter locks Keep ihe torque converter loc ed far at least 5 seconds by holding the throttle and vehicle speed constant Set condition Torque converter malfunctions that are detected the torque converter not locking up p operly when desired and the torque converter not unlocking p operly when desired A minimum amount of improvement in torque converter efficiency is expected after the torque converter is locked Th s expected minimum improvement will not be seen when the torque converter is malfunctianing Three cansecutive test failures over one trip
123. TEST 62 Perform TEST DTC Before Proceeding TJ BODY POWERTRAIN CONTROL MODULE TNANT Downstream Oxygen Sensor Signal DG PK ASD Relay Output DOWNSTREAM OXYGEN SENSOR BR YL Sensor Ground BK DG Upstream Oxygen Sensor Signal OR DG ASD Relay Output BK Ground TO IGNITION COILS GENERATOR AND INJECTORS UPSTREAM OXYGEN SENSOR 80b118a1 JTEC 02 SENSOR CONFIGURATION UPSTREAM DOWNSTREAM UPSTREAM DOWNSTREAM XJ2 5L XJ2 5L 11 UPSTREAM 1 2 DOWNSTREAM XJ4 0L XJ4 0L 11 UPSTREAM 12 DOWNSTREAM 80b76ec3 REPAIRING 1 1 02 SENSOR SHORTED TO VOLTAGE XJ BODY POWERTRAIN CONTROL MODULE TNANT ASD RELAY Downstream DOWNSTREAM OXYGEN SENSOR Relay Output ASD Relay BR YL Output Sensor Ground TO IGNITION COILS GENERATOR AND INJECTORS BK DG Upstream Oxygen Sensor Signal UPSTREAM OXYGEN SENSOR 80b118a2 Name of code C2 Sensor Shorted To Voltage When monitored With the engine running for more than 2 minutes and coolant temperature above 170 F Set condition The oxygen sensor voltage is above 1 2 volts Theory of operation Effective control of exhaust emissions is achieved by an oxygen feedback system The oxygen sensor 025 which is located in the exhaust path monitors the exhaust emissions Once the sensor reaches its normal operating temperature of 300 350 C 572 662 F it generates a voltage inversely proportion
124. TEST TC 118A REPAIRING FUEL SYSTEM RICH 1 1 RICH Perform TEST DTC Before Proceeding Name of Code Fuel System Rich When monitored With the engine running in closed loop moce and the ambient battery temperature above 20 F and altitude lt 8000 ft 0 MOOO CC Set condition The PCM conducts test to determine whether the fuel system is running too rich If this happens for 2 trips the MIL illuminates and a trouble code is stored The MIL remains on for more than one trip but goes out if the conditions that set the code are not found on subsequent trips Theory of operation The catalytic converter works best when the air fuel A F ratio is at or near the optimum of 14 7 to 1 The PCM maintains this optimum air fuel ratio by making short term correcticns in the fuel injector pulse width based or the upstream O2 sensor output The PCM uses the programmed memory as a self calibration tool to compensate for variations in engine specifications sensor tolerances and engine fatigue over the life span of the engine Monitoring the 1 air fuel ratio with the upstream O2 sensor short term and comparing it to the program long term or adaptive memory determines whether the fuel system is operating within the limits needed to pass an emission test If a malfunction prevents the PCM from maintaining the optimum A F ratio the MIL illuminates Possible causes gt Catalyst plugged gt Powertrain contro m
125. THE RESISTANCE BETWEEN TERMINALS 85 AND 86 OF THE ASD RELAY FIG 3 OR 4 IS THE RESISTANCE BETWEEN 65 AND 85 OHMS REPLACE ASD RELAY KEY OFF DISCONNECT THE PCM HARNESS CONNECTOR USING AN OHMMETER MEASURE THE ASD RLY CONTROL CIRCUIT AT PCM TO GROUND gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE ASD RELAY CONTROL CKT FOR A SHORT TO GROUND USING AN OHMMETER MEASURE THE RESISTANCE OF THE ASD RELAY CONTROL CIRCUIT BETWEEN THE RELAY AND THE PCM FIG 1 OR 2 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE ASD RELAY CONTROL CKT FOR AN OPEN 3 REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO mr oUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 0 MOOO mr uUco TEST TC 11A REPAIRING GENERATOR FIELD SWITCHING PROPERLY Perform TEST DTC Before Proceeding TJXJ BODY BK GY To USED POWERTRAIN BATTERY CONTROL MODULE DG OR GEN FIELD SOURCE RECTIFIER C25 GENERATOR DG B10 GEN FIELD DRIVER 80b6f0cd GENERATOR FIELD HARNESS CONNECTOR DG GENERATOR FIELD 80060126 of code Generator Field Not Switching Properly When monitored With the ignition key on and t
126. THROTTLE POSITION 4 INTAKE MANIFOLD AIR TEMPERATURE SENSOR 80524e3c THROTTLE POSITION S mer SENSOR FIG 2 80 87223 TEST 19 CHECKING THE INTAKE AIR TEMPERATURE SENSOR Perform TEST NTC 1A Before Proceeding START TEST NTC 19A NOTE MAKE SURE THE IGNITION KEY IS ON AT THIS TIME ENGINE OFF NOTE DO NOT ALLOW MORE THAN 5 MINUTES DELAY BETWWEN NEXT STEPS USING THE DRB READ THE INTAKE AIR TEMPERATURE IAT SENSOR AND RECORD THE READING THE IAT SENSOR FIG 1 OR 2 USING TEMP PROBE MEASURE THE IAT INSIDE IAT SENSOR OPENING FIG 1 OR 2 IS THE IAT RECORDING WITHIN 12 C 10 F THE PROBE READING REPLACE THE INTAKE AIR TEMPERATURE IAT SENSOR RECONNECT THE MAP SENSOR gt INTAKE AIR TEMP IAT SENSOR TEST PASSED 0 400 4 MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 379 TEST 20 CHECKING THE PARK NEUTRAL POSITION SWITCH Perform TEST NTC 1A Before Proceeding XJ BODY 4 0L AUTO TRANS FUSED IGN SW TRANSMISSION OUTPUT TCM RANGE PCM SENSOR TRS 1 2 SENSE _ 5 3 ER TRS OD SENSE mem 18 TO BACKUP LAMPS STARTER RELAY BKAWT P N Switch Sense 0 400 4 MOOO mr ocozm
127. VOLTS gt CONTINUE TEST TC 26A ON THE NEXT PAGE OBSERVING THE DRB SLOWLY OPEN AND CLOSE THE THROTTLE IS THE TP SENSOR VOLTAGE CHANGE SMOOTH REPLACE THE THROTTLE POSITION SENSOR WIGGLE THE TP SENSOR CONNECTORS AND WIRING HARNESS OBSERVE THE DRB DISPLAY WAS THERE ANY CHANGE IN THROTTLE POSITION SENSOR VOLTAGE WHEN WIGGLED REPAIR THE HARNESS OR CONNECTOR THAT CAUSED THE VOLTAGE CHANGE NO START THE ENGINE WIGGLE THE TP SENSOR CONNECTORS AND HARNESS RPM WAS THERE ANY CHANGE IN THE ENGINE RPM WHILE WIGGLEING THE TP SENSOR HARNESS REPAIR THE HARNESS OR CONNECTOR THAT CAUSED THE ENGINE RPM TO CHANGE NO AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 gt USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY THE PROBLEM DOES NOT EXSIST AT THIS TIME FIG 1 REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 2A Check connectors Clean repair as necessary 109 TEST COMPL
128. ___ __ 14 5 2 OON OS MIM99I SLY0A5 7 201 INGON AND 1 109IM0 Det EISEN NIVHLYHAMOd o Sound ES SS 22 108 e 908M28 VI 0334 909M98 lt 095 811066 res dvi tc 35 Es gt eit HOSN3S o 1IM5MV I 125 ew lt 3A130349 125 e T 103 cr a gu gt diat AHSLIVE HOSN3S 1 910092 3NION3 15 5 m 19 91 1909 820 EI o RH LO _ __ 858 380889958 ANSLLVa De e Ee nm D E N 66066 48 229 4 ND V 7 305455 15 31 1304 lt gt gt gt gt o g JR s SS 909M3 m 3unss3ud 10 LS Nd SN o LIM HOLIMS 55 SEH IH ON T T 495 68599908
129. bad trip is stored when the failure counter reaches 96 Two consecutive bad trips are required to set the fault Possible Causes gt Open or shorted 5 volt supply circuit gt Open sensor ground gt Open or shorted signal circuit gt Excessive crankshaft sensor clearance gt Excessive camshaft sensor clearance gt gt gt gt 0 MOOO mr uUuco Damaged crankshaft sensor rotating component Damaged camshaft sensor rotating component Failed sensor Failed PCM 80a5574d Tak BODY CRANKSHAFT POWERTRAIN SENSOR AND position CONTROL MAP SENSOR SENSOR MODULE GY BK Sensor Signal OR 5 Volt Supply TN YL CMP Sensor Signal CAMSHAFT POSITION SENSOR BR YL Sensor Ground TO OTHER SENSORS 80a4ef 4 5 5 157 EST 157 REPAIRING INTERMITTENT LOSS OF OR Perform TEST TC 157A Before Proceeding KEY OFF DISCONNECT THE PCM HARNESS CONNECTOR IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY DISCONNECT THE CMP SENSOR CONNECTOR IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY DISCONNECT THE CKP SENSOR CONNECTOR IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY RECONNECT THE PCM
130. can damage fuses or components Also a second code could be set making diagnosis of the original problem more difficult 5 3 2 Road Testing a Complaint Vehicle Some complaints will require a test drive as part of the repair verification procedure The purpose of the test drive is to try to duplicate the diagnostic code or symptom condition CAUTION Before road testing a vehicle be sure that all components are reassembled During the test drive do not try to read the DRBIII screen while motion Do not hang the DRB from the rear view mirror or operate it yourself Have an assistant available to operate the DRBIII 24 7 0 DIAGNOSTIC INFORMATION AND PROCEDURES 7 1 GENERAL TROUBLESHOOTING MOOO mr uUcom DTC TEST CHECKING THE SYSTEM FOR DIAGNOSTIC TROUBLE CODES NOTE For all component locations REFER TO GENERAL INFORMATION sections 4 0 in this manual NOTE The battery must be fully charged for any test in this manual 1 Attempt to start the engine Crank for up to 10 seconds if necessary 2 Connect the DRB to the engine diagnostic connector Write down the trouble codes that are displayed If the DRB screen displays No Response go to the TEST NS SEL If the DRB screen is blank or has a DRB message go to General Information Section 3 5 in this manual If trouble code messages are displayed refer to the trouble code list below and on the next page for the appropriate test If there are no troub
131. code Battery voltage gt 11 0 vols Vehicle speed lt 60 mph during step 5 Run vehicle in th rd gear at about 40 mph with torque converter unlocked for at least 10 seconds Apply 1 3 throttle while making sure transmission does not downshift Bac lt off on the throttle slightly unti the torque converter locks Keep ihe torque converter loc ed far at least 5 seconds by holding the throttle and vehicle speed constant Set condition Torque converter malfunctions that are detected the torque converter not locking up p operly when desired and the torque converter not unlocking p operly when desired A minimum amount of improvement in torque converter efficiency is expected after the torque converter is locked Th s expected minimum improvement will not be seen when the torque converter is malfunctianing Three cansecutive test failures over one trip will store the trouble code Qo 0m MOOO mr uUuco Theory of operation The torque converter lock up system locks ihe crankshaft to the output shafl of ihe transmission when vehicle road load is stable and ssion is in third gear This action reduces trans nission heating and improves fuel economy The lock up system is controlled the powertrain control module Possible causes Drive wheel size is bigger than standard wheel size or smaller than spare wheel size Low transmission oil level or pressure Debris in transmission oil Incorrect speedo gear for the front wheels
132. condition This could cause an oxygen sensor fuel system or misfire monitor trouble code to be stored in the PCM Engine Timing The PCM cannot detect an incorrectly indexed timing chain camshaft sprocket or crankshaft sprocket The PCM also cannot detect an incorrectly indexed distributor Fuel Pressure Fuel pressure is controlled by the fuel pressure regulator The PCM cannot detect a clogged fuel pump inlet filter clogged in line fuel filter or a pinched fuel supply Fuel Injectors The PCM cannot detect if the fuel injector is clogged the pintle is sticking or the wrong injectors are installed Fuel Requirements Poor quality gasoline can cause problems such as hard starting stalling and stumble Use of methanol gasoline blends may result in starting and driveability problems See individual symptoms and their definitions in Section 12 0 Glossary of Terms at the back of this book PCM Grounds The PCM cannot detect a poor system ground However a diagnostic trouble code may be stored in the PCM as a result of this condition Throttle Body Air Flow The PCM cannot detect a clogged or restricted air cleaner inlet or filter element Exhaust System The PCM cannot detect a plugged restricted or leaking exhaust system 7 Cylinder Compression The PCM cannot detect uneven low or high engine cylinder compression r JJmzmca 2 0 4 520 2 gt gt
133. for mixing with incoming air Metering of the gases is performed by duty cycling the purge solenoid by the PCM The system is disabled during wide open throttle conditions and while the engine is below a specified coolant temperature When engine temperature becomes greater than a calibrated parameter duty cycle purge is delayed for a calibrated time Once purge delay is over purge will be ramped into soften the effect of dumping additional fuel into the engine The PCM provides a modulated 5 hz signal at closed throttle or 10 hz signal at open throttle to control this sytem Modulation of the signal is based upon a calculated air flow based upon known fuel flow through the injector at a given pulsewidth and RPM and is adjusted to compensate for changes in flow due to varying engine vacuum gt 2 2 0 4 520 2 gt 20 4 5200 12 3 2 9 Operating Modes As input signals to the PCM change the PCM adjusts its response to output devices For example the PCM must calculate a different injector pulse width and ignition timing for idle than it does for wide open throttle There are several different modes of operation that determine how the PCM responds to the various input signals There are two types of engine control operation open loop and closed loop In open loop operation the PCM receives input signals and responds according to preset programming Inputs from the heated oxygen sensors are
134. gie FUSE BLOCK FUSED SI 10 FUSE 4 FUSED IGN SWITCH OUTPUT RUN START IGNITION 10 AMP SWITCH WT BK CCD BUS R TO OTHER CCD BUS MODULES BK GROUND BK LB GROUND 80b6f0cc SENTRY KEY ANTENNA TRANSPONDER IMMOBILIZER MODULE DB GY PDC FusedB ZA gt 806 WT BK JUNCTION BLOCK Fused Ign Switch 10 AMP Output Run Start 6 JUNCTION WT BK BLOCK CCD BUS TO vier OTHER BK LG Ground BK LG Ground 2 8066092 of code Serial Link External Fault When monitored With the ignition on Set condition The SKIM does not receive an expected CCD BUS message transmission acknowledgment from the PCM after three transmit attempts Theory of operation The SKIM expects a CCD BUS message acknowledgment from the PCM on the BUS during its communication process Possible cause gt CCD BUS circuits open shorted to voltage or shorted to ground gt Failed SKIM gt Failed PCM 80b5cc70 318 TEST SK 4A REPAIRING SERIAL LINK EXTERNAL FAILURE Perform TEST SK 1A Before Proceeding START TEST SK 4A TURN IGNITION OFF USING THE DRB DOES THE DRB CONTINUE TEST WAIT 10 SECONDS READ CODES gt DISPLAY THIS CODE gt SK 4A ON THE TURN IGNITION ON NEXT PAGE 5 USING THE CONDITION REQUIRED SCHEMATIC AS A WERE A
135. necessary 177 TJ BODY UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE Qo 0m MOOO mr uUucom XJ BODY UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE TEST TC 62A CONTINUED REPAIRING 1 1 O2 SENSOR SHORTED TO VOLTAGE FUNCTION ASD Relay Output Ground Heater Sensor Ground Oxygen Sensor Signal 5 ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR SIGNAL 80b6f0db EST 62 CONTINUED REPAIRING 1 1 02 SENSOR SHORTED TO VOLTAGE TEST 62 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE 1 1 02 SENSOR HARNESS CONNECTOR USE A VOLTMETER IN THE FOLLOWING STEP KEY ON MEASURE THE 1 1 02 SENSOR SIGNAL CIRCUIT BETWEEN THE 1 1 02 SENSOR HARNESS CONNECTOR AND GROUND FIG 1 2 WAS THE VOLTAGE BETWEEN 4 2 AND 5 2 VOLTS 5 62 INSTALL JUMPER WIRE FROM THE 1 1 02 SENSOR SIGNAL CIRCUIT TO THE SENSOR GROUND gt THE 1 1 02 SENSOR 55 OBSERVE THE DRB FIG 10R2 DID THE 1 1 O2 SENSOR VOLTAGE DROP BELOW 1 0 VOLTS REPLACE THE 1 1 O2 SENSOR MOVE THE JUMPER WIRE FROM THE SENSOR GROUND GROUND OBSERVE THE DRB
136. not monitored In closed loop operation the PCM monitors the inputs from the heated oxygen sensors This input indicates to the PCM whether or not the calculated injector pulse width results in the ideal air fuel ratio of 14 7 parts air to 1 part fuel By monitoring the exhaust oxygen content through the oxygen sensor the PCM can fine tune injector pulse width Fine tuning injector pulse width allows the PCM to achieve optimum fuel economy combined with low emissions The engine start up crank engine warm up and wide open throttle modes are open loop modes Under most operating conditions the acceleration deceleration and cruise modes with the engine at operating temperature are closed loop modes Ignition Switch On Engine Off Mode When the ignition switch activates the fuel injection system the following actions occur 1 The PCM determines atmospheric air pressure from the MAP sensor input to determine basic fuel strategy 2 PCM monitors the engine coolant temperature sensor and throttle position sensor input The PCM modifies fuel strategy based on this input When the Ignition key is in the on position and the engine is not running zero rpm the auto shutdown relay and fuel pump relay are not energized Therefore voltage is not supplied to the fuel pump ignition coil and fuel injectors Engine Start Up Mode This is an open loop mode The following actions occur when the starter motor is engaged 1 T
137. oz 800768609 XJ BODY 4 0L AUTO TRANS POWERTRAIN CONTROL MODULE BLACK CONNECTOR FUNCTION BK WT PARK NEUTRAL POSITION SWITCH SENSE TRANSMISSION RANGE SENSOR CONNECTOR 7 BK WT PARK NEUTRAL POSITION SWITCH SENSE 8 BK GROUND 80ah373a 380 TEST 20 CHECKING THE PARK NEUTRAL POSITION SWITCH Perform TEST NTC 1A Before Proceeding 2 1 5 5 NTC 20A gt IS THIS VEHICLE EQUIPPED WITH A 4 SPEED AISIN TRANSMISSION WITH THE DRB READ THE PARK NEUTRAL SWITCH INPUT STATE WHILE MOVING GEAR SELECTOR THROUGH ALL GEAR POSITIONS WATCH THE DRB DISPLAY DID THE DRB DISPLAY P N AND D R DOES THE PARK NEUTRAL SWITCH INPUT DISPLAY P N ONLY PERFORM TEST gt 20 TRANS RANGE SENSOR TEST PASSED CONTINUE TEST gt NTC 20A ON THE NEXT PAGE DISCONNECT THE TRANS RANGE SENSOR HARNESS CONNECTOR MONITOR THE PARK NEUTRAL SWITCH INPUT STATE ON THE DRB DOES THE DRB DISPLAY D R REPLACE THE TRANSMISSION RANGE SENSOR TURN THE IGNITION OFF DISCONNECT THE THE POWERTRAIN CONTROL MODULE HARNESS CONNECTOR USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE RESISTANCE OF THE P N POSITION SW SENSE CIRCUIT TO GROUND FIG 1 IS THE R
138. the sensor that produces a voltage After measuring the amount of oxygen in the exhaust gases Variations in the signals from this 02 sensor serve as an indicator of oxygen content Possible causes gt Sensor output wire shorted to ground DirtyAvet connection causing voltage tracking in connector Powertrain control module failure gt gt 02 sensor failure gt gt Connector terminals wires TJ BODY POWERTRAIN CONTROL MODULE TNANT Downstream Oxygen Sensor Signal DG PK ASD Relay Output 80a5571b DOWNSTREAM OXYGEN SENSOR BR YL Sensor Ground BK DG Upstream Oxygen Sensor Signal OR DG ASD Relay Output BK Ground TO IGNITION COILS GENERATOR AND INJECTORS UPSTREAM OXYGEN SENSOR 80511841 02 SENSOR CONFIGURATION UPSTREAM DOWNSTREAM UPSTREAM DOWNSTREAM XJ BODY POWERTRAIN CONTROL MODULE TNANT Downstream Relay Output UPSTREAM DOWNSTREAM XJ2 5L XJ2 5L UPSTREAM DOWNSTREAM XJ4 0L XJ4 0L 80b76ec3 ASD RELAY DOWNSTREAM OXYGEN SENSOR BR YL Sensor Ground BK DG Upstream Oxygen Sensor Signal 268 DG WT ASD Relay Output TO IGNITION COILS GENERATOR AND INJECTORS UPSTREAM OXYGEN SENSOR 80b118a2 5 5 156 REFER THE FIGURE FOR POSSIBLE TROUBLE CODE CAUSES FIG 1 IF ENGINE IS WARM TURN ENGINE OFF FOR 15 MINUTES TO ALLOW 02 SEN
139. to enter the combustian chambers The IAT is a negative temperature coefficient NTC thermistor type sensor resistance varies inversely with temperature This means at cold temperatures its resistance is high so the voltage signal will be high At high temperatures resistance decreases and the voltage signal will decrease This allows the sensor to provide an analog voltage signal 12 the PCM The PCM uses this signal to compensate for changes in air density due to temperature MOOO mr uUuco Possible causes gt Sensor signal circuit open or shorted gt Sensor internally open Sensor ground circuit open gt POM failure gt Connector terminals gt Connector wires 4 TJ XJ BODY POWERTRAIN CONTROL GROUNDTO MODULE OTHER SENSORS INTAKE AIR TEMPERATURE BR YL SENSOR Sensor Ground BK RD Intake Air Temperature Signal 80b118a4 170 TEST 58 Perform TEST DTC Before Proceeding START TEST 58 REPAIRING INTAKE AIR TEMP SENSOR VOLTAGE HIGH KEY ON USING THE DRB READ THE INTAKE AIR TEMPERATURE SENSOR VOLTAGE IS THE INTAKE AIR TEMPERATURE SENSOR VOLTAGE ABOVE 4 5 VOLTS CONTINUE TEST TC 58A ON THE NEXT PAGE WIGGLE THE INTAKE AIR TEMP SENSOR CONNECTOR amp HARNESS MONITOR DRB DISPLAY WAS THERE ANY INTAKE AIR TEMPERATURE SENSOR VOLTAGE CHANGE REPAIR THE HARNESS OR CONNECTOR THAT
140. 0 10 VOLTS DISCONNECT THE PCM HARNESS CONNECTORS CONTINUE TEST NTC 10B ON THE NEXT PAGE USING AN OHMMETER MEASURE THE RESISTANCE BETWEEN THE 02 SENSOR SIGNAL CIRCUIT AND GROUND FIG 2 3 4 OR 5 15 5 5 BELOW 5 0 OHMS REPAIR THE OXYGEN SENSOR SIGNAL CKT FOR A SHORT TO GROUND gt REPLACE THE 1 1 OR 1 2 02 SENSOR THAT WAS BELOW 0 10 VOLTS 0 400 4 MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 361 MOOO 2 oz BODY POWERTRAIN CONTROL MODULE Downstream Oxygen Sensor signal Relay Output Sensor Ground BK DG Upstream Oxygen Sensor Signal XJ BODY POWERTRAIN CONTROL MODULE Downstream Oxygen Sensor Signal Sensor Ground BK DG Upstream Oxygen Sensor Signal TEST NTC 10B CONTINUED CHECKING THE OXYGEN SENSOR SWITCHING DOWNSTREAM OXYGEN SENSOR IGNITION COILS GENERATOR AND INJECTORS UPSTREAM OXYGEN SENSOR 805118 1 ASD RELAY DOWNSTREAM OXYGEN SENSOR ASD Relay Output TO IGNITION COILS GENERATOR AND INJECTORS UPSTREAM OXYGEN SENSOR 80b118a2 5 10 CONTINUED FROM THE PREVIOUS PAGE KEY ON ENGINE OFF EST 10 CONT
141. 0 OHMS REPAIR THE SHORT TO GROUND IN THE P N POSITION SWITCH SENSE CIRCUIT 2 REPLACE THE POWERTRAIN CONTROL MODULE 0 400 4 MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 385 TJ XJ 3 SPEED AUTO TRANS 0 400 4 MOOO mr ocozm oz TEST NTC 20B CONTINUED CHECKING THE PARK NEUTRAL POSITION SWITCH POWERTRAIN CONTROL MODULE BLACK CONNECTOR COLOR FUNCTION BK WT PARK NEUTRAL POSITION SW SENSE XJ 2 5L BR LB PARK NEUTRAL POSITION SW SENSE TJ 2 5L 4 01 PARK NEUTRAL POSITION SWITCH CONNECTOR XJ 2 5L A T 1 WT FUSED IGNITION SWITC 4 OUTPUT 2 PARK NEUTRAL POSITION SW SENSE 3 BAGK UP LAMPS FEED TJ 2 5L AND 4 0L A T 1 FUSED IGNITION SWITC 4 OUTPUT 2 PARK NEUTRAL POSITION SW SENSE 3 VI BK BACK UP LAMPS FEED 80b7Gec8 EST 20 CONTINUED CHECKING THE PARK NEUTRAL POSITION SWITCH TEST 20 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE P N POSITION SWITCH HARNESS CONNECTOR KEY ON USING A VOLTMETER MEASURE THE THE P N POSITION SWITCH SENSE CIRCUIT FIG 1 gt 15 ABOVE 10 0 VOLTS gt REPAIR THE OPEN IN THE P N POSITION SWITCH SENSE CIRCUIT USING THE D
142. 0 VOLTS I 39 REPAIR THE FUEL PUMP RELAY OUTPUT CIRCUIT FOR AN OPEN USING THE DRB STOP THE ACTUATION TEST USING OHMMETER MEASURE THE FUEL PUMP GND CIRCUIT IN THE FUEL PUMP CONN FIG 1 OR 2 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE FUEL PUMP GROUND CIRCUIT FOR AN OPEN Perform Verification TEST VER 1A Check connectors Clean repair as necessary 453 L REPLACE THE FUEL PUMP gt 10 OZ TEST 6 REPAIRING NO RESPONSE CONDITION Perform TEST NS SEL Before Proceeding TJ BODY POWERTRAIN CONTROL MODULE BLACK CONNECTOR OAYOMaA 3 40 OZ COLOR FUNCTION IGNITION SWITCH OUTPUT SENSOR GROUND FUSED B GROUND GROUND 80b76ef5 XJ BODY POWERTRAIN CONTROL MODULE BLACK CONNECTOR FUNCTION IGNITION SWITCH OUTPUT SENSOR GROUND FUSED B GROUND GROUND 80aafae 5 5 5 NS 6A KEY OFF DISCONNECT THE PCM HARNESS CONNECTOR V USING AN OHMMETER PROBE BOTH GROUND CIRCUITS AT PCM CONNECTOR FIG OR 2 REPAIRING NO RESPONSE CONDITION Perform TEST NS SEL Before Proceeding A IS THE RESISTANCE BELOW 5 0 OHMS AT BOTH TERMINALS 3 GROUND S THE POWERTRAIN CONTROL MODULE FOR AN gt
143. 04 of Code Cam Signal at When monitored Ignition ON Set condition If 96 crank signals are counted and no signal from the cam position sensor is present the code will set Theory of operation The cam position sensor is a hall effect type sensor used to detect the camshaft position The PCM supplies 5 volts and a ground to power up the sensor The PCM also supplies a 5 volt pull up voltage The sensor signal is created by the pulse ring in the distributor passing through the sensor When the leading edge of the ring is in the sensor the sensor is high 5 0V when the trailing edge is clear of the sensor the signal is low 0 3V Possible causes Open 5 volt supply circuit Open sensor ground Open or shorted signal circuit Damaged pulse ring Failed sensor Failed PCM 1 REPAIRING CAM SIGNAL PCM START TEST KEY OFF REMOVE DISTRIBUTOR CAP AND ROTOR FIG 1 INSPECT THE PULSE RING FOR DAMAGE OR MISALIGNMENT IS THE PULSE RING CH NO REPAIR OR REPLACE THE DISTRIBUTOR AND OR THE PULSE RING AS NECESSARY Perform Verification TEST VER 2A REPLACE THE CAMSHAFT POSITION SENSOR Check connectors Clean repair as necessary MOOO mr oUuco TEST TC 1C REPAIRING
144. 0b04fe4 188 CONTINUED REPAIRING SPEED CONTROL POWER RELAY OR SPEED CONTROL Name of code Speed Control Power Relay Circuit When monitored With the ignition key on speed control switched on Set condition The speed control power supply circuit is either open or shorted to ground Theory of operation The PCM monitors the voltage drop across all speed control solenoids and the power supply circuit Possible causes Open and shorted power supply circuit Failed dump solenoid S C servo 80 0165 BODY CONTROL MODULE CONNECTORS FUNCTION SENSOR GROUND S C VACUUM SOL CONTROL S C VENT SOL CONTROL 12 VOLT SUPPLY BRAKE SWITCH SENSE S C SWITCH SIGNAL 80660166 TEST 82 5 5 82 CONTINUED REPAIRING SPEED CONTROL POWER RELAY SPEED CONTROL 12V DRIVER CIRCUIT USING AN OHMMETER MEASURE THE GROUND CIRCUIT AT y THE SERVO 4 WAY HARNESS CONNECTOR 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN SERVO GROUND CIRCUIT WITH AN OHMMETER PERFORM THE FOLLOWING MEASUREMENTS TO GROUND SPEED CONTROL VENT SOL CKT AND SPEED CONTROL VACUUM SOL FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS FOR EITHER MEASUREMENT CIRCUIT S THAT MEASUR
145. 1 0 2 0 3 0 4 0 5 0 TABLE CONTENTS INTRODUCTION edad erasures ease ees e 1 1 1 SYSTEM COVERAGE 1 1 2 SIX STEP TROUBLESHOOTING PROCEDURE 1 IDENTIFICATION OF SYSTEM see RIES REENEN rh ERR 1 SYSTEM DESCRIPTION AND FUNCTIONAL 1 3 1 GENERAL DESCRIPTION 44243349 3 rm RR eh n ER ER REOR 1 3 2 CONTROLLER AND OPERATING MODES 1 3 2 KG RE PUR ERE TREE E REA 1 92 Hardware FRE abe 2 3 2 3 Software Architecture 2 3 2 4 Spak Control speer erapr 2 3 2 5 chew 2 326 On Board DIagnOS l6S iens S Feux RES 6 Edad ue pounds be 3 3 2 7 Transmission Control 4 0L XJ Body 3 326 Diner cues XR bead Ge ER RC RUD P E 3 3 29 POM Operating 4 3 2 10 Non Monitered sy RE E RES EE 5 3 2 11 SKIS OVERVIEW 25 556 E 6 3 2 12 SKIS OPERATION bee EER Ree 6 3 3 DIAGNOS
146. 12 TO OTHER MODULES 806000 TRANSPONDER CHIP IN KEY PDC JUNCTION BLOCK 10 AMP JUNCTION BLOCK 80561092 TEST TC 226A CONTINUED REPAIRING CCD BUS MESSAGE RECEIVED FROM SKIM TEST 226 USING THE DRB REFER TO CONTINUED FROM ATTEMPT TO CAN YOU SENTRY KEY THE PREVIOUS COMMUNICATE WITH gt gt IMMOBILIZER PAGE THE SKIM MODULE THE SKIM SECTION TEST DTC KEY OFF DISCONNECT THE DISCONNECT THE PCM SKIM HARNESS HARNESS CONNECTOR CONNECTORS MEASURE THE CCD USE AN OHMMETER IN BUS CIRCUIT IS THE RESISTANCE REPAIR THE OPEN THE FOLLOWING L BETWEEN THE PCM AND gt BELOW 5 0 OHMS CCD BUS STEPS THE SKIM MODULE CIRCUIT FIG 1 OR 2 MEASURE THE CCD BUS CIRCUIT IS THE RESISTANCE REPAIR THE OPEN BETWEEN THE PCM AND BELOW 5 0 OHMS CCD BUS THE SKIM MODULE CIRCUIT FIG 1 OR 2 REPLACE THE POWERTRAIN CONTROL MODULE Perform Verification TEST VER 1A Check connectors Clean repair as necessary 291 0 MOOO mr oUuco TJ BODY 0 MOOO CC XJ BODY TEST TC 232A REPAIRING INVALID OR WRONG KEY MESSAGE FROM SKIM Perform TEST DTC Before Proceeding ANTENNA TRANSPONDER SENTRY KEY IMMOBILIZER MODULE gie FUS
147. 180 F OR ABOVE WAS THE COOLANT TEMPERATURE VALUE INCREASE A SMOOTH TRANSITION INSPECT FOR MECHANICAL COOLING PROBLEMS BEFORE REPLAC NG THE SENSOR Perform Verification TEST VER 2A REPLACE THE ECT SENSOR DID THE COOLANT TEMPERATURE REACH 82 C 180 F OR ABOVE 5 MECHANICAL COOLING PROBLEMS BEFORE REPLAC ING THE SENSOR Check connectors Clean repair as necessary 353 REPLACE THE ECT SENSOR ECT SENSOR OPERATING NORMALLY TEST PASSED MOOO mr ocozm oz TEST NTC 7A CHECKING THE THROTTLE POSITION SENSOR Perform TEST NTC 1A Before Proceeding TJ XJ BODY POWERTRAIN GROUND CONTROL TO OTHER MODULE THROTTLE SENSORS POSITION SENSOR BR YL SENSOR GROUND A4 OR DB TP SENSOR SIGNAL 23 5V SUPPLY TO OTHER SENSORS 0 400 4 MOOO mr ocozm oz 80509844 TJ XJ BODY THROTTLE POSITION SENSOR CONNECTOR COLOR FUNCTION 1 SENSOR GROUND 2 ORDB TP SENSOR SIGNAL 3 OR 5 VOLT SUPPLY 80551067 START TEST NTC 7A DISCONNECT THE TP SENSOR CONNECTOR KEY ON USING A VOLTMETER MEASURE THE TP SENSOR SIGNAL CIRCUIT FIG 1 EST NTC 7A CHECKING THE THROTTLE POSITION SENSOR Perform TEST NTC 1A Before Proceeding
148. 2 gt 2 Excessive Consumption Although the PCM monitors the exhaust stream oxygen content through the oxygen sensor when the system is in a closed loop it cannot determine excessive oil consumption NOTE Any of these conditions could result in a rich or lean condition causing an oxygen sensor trouble code to be stored in the PCM or the vehicle may exhibit one or more of the driveability symptoms listed in TEST 1 No Trouble Code Test Menu 3 2 11 SKIS OVERVIEW The Sentry Key Immobilizer System SKIS is an immobilizer system designed to prevent unauthorized vehicle operation The system consists of a Sentry Key Immobilizer Module SKIM ignition key s equipped with a transponder chip and powertrain controller When the ignition switch is turned on the SKIM interrogates the ignition key If the ignition key is Valid the SKIM sends a CCD Bus message to the powertrain controller indicating the presence of a valid ignition key With a valid key presence the PCM allows the engine to continue to operate 3 2 12 SKIS OPERATION When ignition power is supplied to the SKIM the SKIM performs an internal self test After the self test is completed the SKIM energizes the antenna this activates the transponder chip and sends a challenge to the transponder chip The transponder chip responds to the challenge by generating an encrypted response message using the following Secret Key This is an ele
149. 2 SENSOR SIGNAL m gt CIRCUIT FROM THE PCM CONNECTOR TO GROUND FIG 1 2 5 5 5 BELOW 5 0 OHMS REPAIR THE 1 1 02 SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND MEASURE THE 1 1 O2 SENSOR SIGNAL TO THE SENSOR GROUND CIRCUIT AT THE 1 1 O2 SENSOR HARNESS CONNECTOR FIG 1 2 gt IS THE RESISTANCE BELOW 5 0 OHMS REPLACE THE POWERTRAIN CONTROL MODULE REPAIR THE 1 1 02 SENSOR SIGNAL CIRCUIT FOR A SHORT TO SENSOR GROUND CIRCUIT MOOO 22 Perform Verification TEST VER 2A Check connectors Clean repair as necessary 267 0 MOOO mr oUcom TEST 156 REPAIRING 1 2 02 SENSOR SHORTED GROUND Perform TEST DTC Before Proceeding Name of code Downstream O25 Voltage Shorted To Ground When monitored With engine coolant temperature above 170 F on the previous key on after a cold start engine coolant below 90 F and ambient sensor reading within 59 F of engine coolant Set condition The downstream oxygen sensor signal voltage is below 0 156 volt prior to O2 sensor heater test Theory of operation The downstream oxygen sensor is a voltage generating device The PCM receives exhaust gas information from this O2 sensor The sensor detects exhaust gas content by a galcanic reaction within
150. 2 TC 20A REPAIRING INJECTOR 2 CONTROL CIRCUIT 84 TC 21A REPAIRING INJECTOR CONTROL CIRCUITS 86 TC 25A REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS 92 TC 26A REPAIRING THROTTLE POSITION SENSOR VOLTAGE LOW 108 TC 27A REPAIRING THROTTLE POSITION SENSOR VOLTAGE HIGH 112 TC 30A REPAIRING ECT SENSOR VOLTAGE TOO LOW 116 TC 31A REPAIRING ECT SENSOR VOLTAGE TOO HIGH 120 TC 35A REPAIRING NO VEHICLE SPEED SENSOR SIGNAL 124 TC 36A REPAIRING MAP SENSOR VOLTAGE TOO LOW NO 5 VOLTS TO MAR SENSOR EE 134 TC 37A REPAIRING MAP SENSOR VOLTAGE TOO HIGH 140 TC 39A REPAIRING NO CHANGE IN MAP FROM START TO RUN 146 TC 40A REPAIRING NO CRANK REFERENCE SIGNAL AT PCM 150 TC 43A REPAIRING IGNITION COIL 1 PRIMARY CIRCUIT 156 TC 44A REPAIRING NO ASD RELAY OUTPUT VOLTAGE AT POM 160 TC 49A REPAIRING PCM FAILURE EEPROM WRITE DENIED 164 TC 57A REPAIRING INTAKE AIR TEMP SENSOR VOLTAGE LOW 166 TC 58A REPAIRING INTAKE AIR TEMP SENSOR VOLTAGE HIGH 170 TC 61A REPAIRING INJECTOR 4 CONTROL CIRCUIT 174 TC 62A REPAIRING 1 1 O2 SENSOR SHORTED TO VOLTAGE 176 TC 69A REPAIRING INJECTOR 5 CONTROL CIRCUIT 182 TC 70A REPAIRING INJECTOR 6 CONTROL CIRCUIT 184 TC 82A REPAIRING SPEED CONTROL POWER RELAY OR SPEED CONTROL 12V DRIVER C
151. 2 TN INJECTOR 2 DRIVER 2 TN INJECTOR 2 DRIVER POWERTRAIN POWERTRAIN CONTROL MODULE CONTROL MODULE CONNECTORS we CONNECTORS SE Ply gt gt 5 lt lt COLOR FUNCTION COLOR FUNCTION B15 TN INJECTOR 2 DRIVER B15 TN INJECTOR 2 DRIVER C12 DG PK ASD RELAY OUTPUT TJ C12 DG PK ASD RELAY OUTPUT TJ C12 DG OR ASD RELAY OUTPUT XJ C12 DG OR ASD RELAY OUTPUT XJ 5 80b76ea3 80b76ea7 TEST 20 5 5 20 DISCONNECT THE INJECTOR 2 CONNECTOR USING AN OHMMETER MEASURE RESISTANCE OF INJECTOR 2 REPAIRING INJECTOR 2 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding IS THE RESISTANCE BETWEEN 10 0 AND 16 0 OHMS REPLACE THE FUEL INJECTOR KEY ON USING THE DRB ACTUATE THE AUTO SHUTDOWN RELAY USING TEST LIGHT CONNECTED TO GROUND PROBE THE ASD RELAY OUTPUT CIRCUIT FIG 1 2 DOES THE TEST LIGHT ILLUMINATE REPAIR THE ASD RELAY OUTPUT CIRCUIT FOR AN OPEN WITH THE ASD RELAY STILL ACTUATED USING A VOLTMETER MEASURE THE INJECTOR DRIVER CIRCUIT BETWEEN THE INJECTOR HARNESS CONNECTOR AND GROUND FIG 1 OR 2 IS THE VOLTAGE ABOVE 1 0 VOLTS 2 DRIVER CIRCUIT FOR A SHORT TO VOLTAGE IF OKAY REPLACE PCM
152. 200 12 11 0 12 0 RECOMMENDED TOOLS AND EQUIPMENT DRBIII diagnostic read out box fuel line adapter 6523 6539 or 6941 fuel pressure test kit C 4799 B or 5069 jumper wires ohmmeter oscilloscope vacuum gauge voltmeter pressure gauge 0 300 psi GLOSSARY OF TERMS backfire popback CKP CMP cuts out misses DLC detonation spark knock ECT EGR generator hard start hesitation sag stuble lack of power sluggish MAP MTV MVLPS fuel ignites in either the intake or the exhaust system crank position sensor camshaft position sensor a steady pulsation or the inability of the engine to maintain a consistent rpm data link connector previously called engine diagnostic connector a mild to severe ping especially under loaded engine conditions engine coolant temperature sensor exhaust gas recirculation valve and system previously called alternator The engine takes longer than usual to start even though it is able to crank normally There is a momentary lack of response when the throttle is opened This can occur at all vehicle speeds If it is severe enough the engine may stall intake air temperature sensor Combined engine and transmission control module The engine has less than expected power with little or no increase in vehicle speed when the throttle is opened manifold absolute pressure sensor manifold tuning valve manual valve
153. 3 TEST 9 REPAIRING NO CRANK CONDITION Perform TEST NS 9A Before Proceeding TJ BODY STARTER RELAY CONNECTOR IN PDC FUSED Bi IGNITION SWITCH OUTPUT PARK NEUTRAL SW SENSE AUTO TRANS GROUND MANUAL TRANS STARTER RELAY OUTPUT 3 40 OZ STARTER RELAY OUTPUT WIRE CONNECTOR AT SOLENOID _1 er smarter RELAY OUTPUT 80b76f25 XJ BODY STARTER RELAY CONNECTOR IN PDC FUNCTION YL FUSED 80 PIN POSITION SW SENSE ALTC TRANS GROUND MANUAL TRANS FUSED IGNITION SW OUTPUT STARTER RELAY OUTPUT md SS STARTER RELAY 28 Esc OUTPUT WIRE Eng SOLENOID BR STARTER RELAY OUTPUT 80b76f26 FIG 2 5 9 5 5 NS 9C REPAIRING CRANK CONDITION Perform TEST NS 9A Before Proceeding DID THE STARTER MOTOR CRANK THE ENGINE NOTE IF THE STARTER SOLENOID CLICKED WHEN THE JUMPER WIRE WAS CONNECTED DISCONNECT THE JUMPER WIRE DISCONNECT STARTER RELAY OUTPUT WIRE FROM THE STARTER SOLENOID USE AN OHMMETER IN THE FOLLOWING STEP CONTINUE TEST gt 5 9 RESISTANCE OF THE STARTER RELAY OUTPUT CIRCUIT FROM THE RELAY TO THE SOLENOID CONNECTOR FIG 1 OR 2 gt IS THE RESISTANCE BE
154. 4 BR YL SENSOR GROUND C4 TV RD S C VACUUM SOL CONTROL C5 LG RD S C VENT SOL CONTROL 11 YL RD 12 VOLT SUPPLY C24 BRAKE SWITCH SENSE C32 RD LG S C SWITCH SIGNAL SPEED CONTROL SWITCH CONNECTOR CAV COLOR FUNCTION 1 BRAYL GROUND 2 RD LG SPEED CONTROL SIGNAL FIG 2 80b6b36a 412 TEST 5 2 5 5 5 2 CHECKING SPEED CONTROL ON OFF SWITCH Perform TEST SC 1A Before Proceeding KEY ON WITH THE DRB READ THE SPEED CONTROL SWITCH VOLTAGE DOES THE DRB DISPLAY SC SW ABOVE 4 0 VOLTS c gt CONTINUE TEST SC 2A ON THE NEXT DISCONNECT THE SPEED CONTROL ON OFF SET SWITCH y WITH THE DRB READ THE SPEED CONTROL SWITCH VOLTAGE DOES THE DRB DISPLAY SC SW ABOVE 4 0 VOLTS m REPLACE THE SPEED CONTROL ON OFF SET SWITCH DISCONNECT THE S C RESUME COAST CANCEL SWITCH HARNESS CONNECTOR WITH THE DRB READ THE SPEED CONTROL SWITCH VOLTAGE DOES THE DRB YES DISPLAY SC SW ABOVE 4 0 VOLTS REPLACE THE SPEED CONTROL RESUME COAST CANCEL SWITCH KEY OFF DISCONNECT THE POWERTRAIN CONTROL MODULE HARNESS CONNECTOR USING OHMMETER MEASURE THE S C SWITCH SIGNAL CKT FROM S C SW TO GND FIG 1
155. 4 LB BR Injector 4 Driver A10 K60 YL BK Idle Air Control 3 Driver B23 G60 GY YL Oil Pressure Sensor Signal 11 K40 BR WT Idle Air Control 2 Driver B27 G7 WT OR Vehicle Speed Sensor Signal 12 10 DB BR Power Steering Pressure Switch B31 K6 VT OR 5 Volt Supply Secondary Sense 2 5L C1 C13 DB OR A C Comp Clutch Relay Control A15 K21 BK RD Intake Air Temp Sensor Signal C3 K51 DB YL Auto Shutdown Relay Control A16 K2 TN BK ECT Sensor Signal C4 V36 TN RD Speed Control Vacuum Sol 17 7 5 Volt Supply Primary Control A18 K44 TN YL Camshaft Position Sensor C5 V35 LG RD Speed Control Vent Sol Control Signal C11 V32 YL RD S C 12 Volt Supply A19 K39 GY RD Idle Air Control 4 Driver C12 A142 DG PK Auto Shutdown Relay Output A20 K59 VT BK Idle Air Control 1 Driver C15 K118 PK YL Battery Temp Sensor Signal A22 A14 RD WT Fused C19 K31 BR Fuel Pump Relay Control A23 K22 OR DB Throttle Position Sensor Signal C20 K52 PK BK Evap Emission Solenoid Control A24 K41 BK DG Upstream O2 Sensor Signal 1 1 C22 C22 DB WT A C Switch Sense A25 K141 TN WT Downstream O2 Sensor C23 C90 LG A C Switch Output Signal 1 2 C24 K29 WT PK Brake Switch Sense A27 K1 DG RD MAP Sensor Signal C25 K72 DG OR Generator Field Source A31 212 BK TN Ground C26 K226 DB LG Fuel Level Sensor Signal A32 Z12 BK TN Ground C27 D21 PK SCI Transmit B4 K11 WT DB Injector 1 Driver C28 D2 WT BK CCD Bus B5 K13 YL WT Injector 3 Driver C29 D20 LG SCI Receive B6 K15 PK BK Injector 5 Dri
156. 5A REPAIRING OIL PRESSURE SENSOR LOW EXCEEDED 296 TC 236A REPAIRING OIL PRESSURE SENSOR HIGH EXCEEDED 300 SENTRY KEY IMMOBILIZER SYSTEM SK 1A IDENTIFYING SENTRY KEY IMMOBILIZER SYSTEM 306 SK 2A REPAIRING PCM STATUS FAILURE 310 SK 3A REPAIRING ROLLING CODE 314 SK 4A REPAIRING SERIAL LINK EXTERNAL FAILURE 318 SK 5A REPAIRING TRANSPONDER COMMUNICATION FAILURE 322 SK 6A REPAIRING TRANSPONDER CRC CYCLIC REDUNDANCY CHECK FAILURE UR CER ES 326 SK 7A REPAIRING TRANSPONDER ID MISMATCH 330 SK 8A REPAIRING TRANSPONDER RESPONSE MISMATCH 334 SK 9A REPAIRING VIN 338 NO TROUBLE CODE TESTS NTC 1A NO TROUBLE CODE TEST 342 NTC 2A CHECKING SECONDARY IGNITION AND TIMING 344 NTC 3A CHECKING THE PCM POWER AND GROUND CIRCUITS 346 NTC 4A CHECKING THE ENGINE 348 NTC 5A CHECKING THE FUEL DELIVERY 350 NTC 6A CHECKING THE COOLANT SENSOR 352 NTC 7A CHECKING THE THROTTLE POSITION SENSOR 354 NTC 8A CHECKING THE MAP SENSOR 356 NTC 10A CHECKING THE OXYGEN SENSOR SWITCHING 358 NTC 11A CHECKING THE OXYGEN SENSOR HEATER 364 NTC 12
157. 8 1 0 INTRODUCTION The procedures contained in this manual include all the specifications instructions and graphics needed to diagnose powertrain control module PCM problems they are no start diagnostic trouble code and no trouble code problems for the PCM The diagnostics in this manual are based on the failure condition or symptom being present at the time of diagnosis When repairs are required refer to the appropriate volume of the service manual for proper removal and repair procedure Diagnostic procedures change every year New diagnostic systems may be added carryover systems may be enhanced READ THE GENERAL INFORMATION SECTIONS IN THIS MANUAL BEFORE TRYING TO DIAGNOSE A VEHICLE TROUBLE CODE It is recommended that you review the entire manual to become familiar with all new and changed diagnostic procedures This book reflects many suggested changes from readers of past issues After using this book if you have any comments or recommendations please fill out the form at the back of the book and mail it back to us 1 1 System Coverage This diagnostic procedures manual covers all 1999 TJ and XJ vehicles equipped with a JTEC PLUS engine controller 1 2 Six Step Troubleshooting Procedure Diagnosis of the powertrain control module PCM is done in six basic steps e verification of complaint e verification of any related symptoms e symptom analysis problem isolation e repair of isolated problem
158. 8 NS 5A CHECKING THE FUEL 450 NS 6A REPAIRING NO RESPONSE 454 NS 7A CHECKING THE IDLE AIR CONTROL MOTOR 472 NS 8A REPAIRING A START AND STALL CONDITION 478 NS 9A REPAIRING NO CRANK CONDITION 480 VERIFICATION TEST VER 1A NO START VERIFICATION 488 VER 2A ROAD TEST VERIFICATION 489 VER 3A CHARGING 491 VER 4A SPEED CONTROL VERIEICGATION 492 MAINTENANCE AND SERVICE 493 8 1 PROGRAMMING THE POWERTRAIN CONTROL MODULE 493 8 2 PROGRAMMING THE SENTRY KEY IMMOBILIZER MODULE 493 8 3 PROGRAMMING IGNITION KEYS TO THE SENTRY KEY IMMOBILIZER MODULE ORT e c 493 SPECIFICATIONS 23x irn x a wee CR e 494 9 1 FUEL SYSTEM RELEASE PROCEDURE 494 SCHEMATIC DIAGRAMS manchen x wh CH AN cR 495 1011 TJ BODY 2 5 4 0L JTEC sre REESE 495 10 2 AJBODY S 5L dri oed Dd deg 496 10 3 XJ BODY Um ER b dake 497 RECOMMENDED TOOLS AND EQUIPMENT 498 GLOSSARY OF 49
159. A CHECKING THE IDLE AIR CONTROL MOTOR 366 NTC 13A CHECKING THE ENGINE 368 NTC 15A CHECKING BATTERY TEMP SENSOR 370 NTC 17A CHECKING THE EVAPORATIVE EMISSION SYSTEM 372 NTC 19A CHECKING THE INTAKE AIR TEMPERATURE SENSOR 378 NTC 20A CHECKING THE PARK NEUTRAL POSITION SWITCH 380 NTC 21A CHECKING THE OIL PRESSURE SENDING 388 NTC 25A CHECKING THE FUEL LEVEL SENSOR 394 NTC 26A CHECKING THE A C SYSTEM 396 NTC 27A CHECKING THE RADIATOR FAN OPERATION 398 8 0 9 0 10 0 12 0 TABLE OF CONTENTS Continued SPEED CONTROL TESTS SC 1A CHECKING THE SPEED CONTROL SYSTEM 402 SC 2A CHECKING SPEED CONTROL ON OFF SWITCH 412 SC 3A CHECKING THE SPEED CONTROL RESUME SWITCH 416 SC 4A CHECKING THE BRAKE SWITCH 418 SC 5A CHECKING THE SPEED CONTROL OPERATION 422 CHARGING TESTS CH 1A CHARGING SYSTEM NO CODE 5 424 NO START TESTS NS SEL NO START SELECTION MENU 430 NS 1A QUALIFYING NO START 432 NS 2A CHECKING THE FUEL 5 442 NS 3A CHECKING ENGINE MECHANICAL 5 5 446 NS 4A REPAIRING LOW FUEL PRESSURE 44
160. AGE BELOW 4 0 VOLTS REPLACE THE CRANKSHAFT SENSOR DISCONNECT THE MAP SENSOR READ VOLTMETER IS THE VOLTAGE BELOW 4 0 VOLTS REPLACE THE MAP SENSOR CONTINUE TEST gt NS 6D ON THE NEXT PAGE 3 40 OZ Perform Verification TEST VER 1A Check connectors Clean repair as necessary 469 EST NS 6D CONTINUED REPAIRING NO RESPONSE CONDITION 0 400 4 3 40 OZ BATTERY TEMP CIS BATTERY TEMP 7 FUEL LEVEL SENSOR Dal EEN GHAHGE AIK CHARGE TEMP PCM wo APEEP SENSOR D A SENSOR RETURN 470 TEST 60 TEST NS 6D CONTINUED FROM THE PREVIOUS PAGE CONTINUED REPAIRING NO RESPONSE CONDITION DISCONNECT THE VEHICLE SPEED SENSOR READ THE VOLTMETER IS THE VOLTAGE BELOW 4 0 VOLTS gt REPLACE THE VEHICLE SPEED SENSOR DISCONNECT THE TRANSMISSION SOLENOID CONNECTOR EQUIPPED Si READ VOLTMETER IS THE VOLTAGE BELOW 4 0 VOLTS GOVERNOR TEMP PRESSURE SENSOR DISCONNECT THE VOLTMETER MEASURE THE VOLTAGE OF THE SENSOR GROUND CIRCUIT IS THE VOLTAGE ABOVE 1 0 VOLT REPA
161. AIR TEMP SENSOR CONNECTOR amp HARNESS MONITOR THE DRB DISPLAY WAS THERE ANY INTAKE AIR TEMPERATURE SENSOR VOLTAGE CHANGE REPAIR THE HARNESS OR CONNECTOR THAT CAUSED THE VOLTAGE CHANGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG T USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDTIONAL INFORMATION ON INTERMITTENT CODES gt TEST COMPLETE 0 MOOO mr uUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 167 TEST TC 57A CONTINUED REPAIRING INTAKE AIR TEMP SENSOR VOLTAGE LOW TJ BODY INTAKE AIR TEMPERATURE SENSOR CONNECTOR MOOO CC COLOR 1 BK RD IAT SIGNAL 2 BR YL SENSOR GROUND 80061064 INTAKE AIR TEMPERATURE SENSOR CONNECTOR CAV COLOR FUNCTION 1 BR YL SENSOR GROUND 2 BK RD IAT SIGNAL 806099 6 EST 57 CONTINUED REPAIRING INTAKE AIR TEMP SENSOR VOLTAGE LOW TEST TC 57A CONTINUED FROM THE PREVIOUS PAGE DISCONNECT THE INTAKE AIR TEMPERATURE IAT SENSOR XX USING THE DRB READ THE IAT SENSOR VOLTAGE gt IS THE INTAKE AIR TEMPERATURE SENSOR VOLTA
162. AL INFO 3 3 2 FOR INFORMATION ON INTERMITTENT TROUBLE CODES gt TEST COMPLETE 0 MOOO CC Perform Verification TEST VER 2A Check connectors Clean repair as necessary 157 MOOO CC TEST TC 43A CONTINUED REPAIRING IGNITION COIL 1 PRIMARY CIRCUIT TJ BODY XJ BODY IGNITION COIL CONNECTOR EE AOT COLOR FUNCTION 2 IGNITION COIL DRIVER DG OR ASD RELAY OUTPUT GY IGNITION COIL DRIVER 80881088 NOTE WIRES IN EITHER CAVITY FIG 2 80212591 TJ BODY XJ BODY POWERTRAIN POWERTRAIN CONTROL MODULE 4 4 SY CONTROL MODULE BLACK CONNECTOR gt BLACK CONNECTOR GY IGNITION COIL DRIVER COLOR FUNCTION IGNTION COIL DRIVER IGNITION COIL IGNITION COIL CONNECTOR CONNECTOR 1 DG OR ASD RELAY OUTPUT 2 GY IGNITION COIL DRIVER 80b099be 80576 0 COIL TYPICAL VIEW 80b46atc 158 5 4 CONTINUED FROM THE PREVIOUS PAGE EST TC 43A CONTINUED REPAIRING IGNITION COIL 1 PRIMARY CIRCUIT KEY OFF DISCONNECT THE IGNITION COIL CONNECTOR IS ANY TERMINAL DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY KEY ON USING THE DRB ACTUATE IGNITION COIL USING A TEST LIGHT PROBE THE ASD RELAY OUTPUT CIRCUIT FIG 1 OR 2 DOES THE TEST LIGHT ILLUMINATE
163. ANCE SPEED CONTROL RESISTANCE OF THE CONNECTOR gt BELOW 5 0 OHMS VACUUM SOLENOID S C VACUUM SOLENOID CONTROL CIRCUIT CONTROL CIRCUIT FIG 1 USING AN OHMMETER REPAIR THE SHORT MEASURE S C VACUUM IS THE RESISTANCE TO GROUND IN THE SOLENOID CONTROL gt BELOW 5 0 OHMS SPEED CONTROL CIRCUIT TO GROUND VACUUM SOLENOID FIG 2 CONTROL CIRCUIT USING AN OHMMETER FROM PCM CONNECTOR REPAIR THE OPEN MEASURE THE TO S C SERVO IS THE RESISTANCE SPEED CONTROL VENT RESISTANCE OF THE CONNECTOR A BELOW 5 0 OHMS SOLENOID CONTROL S C VENT SOLENOID CLRCULT CONTROL CIRCUIT FIG 1 USING AN OHMMETER REPAIR THE SHORT MEASURE THE S C VENT IS THE RESISTANCE TO GROUND IN THE SOLENOID CONTROL gt BELOW 5 0 OHMS SPEED CONTROL VENT CIRCUIT TO GROUND SOLENOID CONTROL FIG 2 CIRCUIT REPLACE THE SPEED CONTROL SERVO Perform Verification TEST VER 4A Check connectors Clean repair as necessary 407 rOx34zoo TEST SC 1D CHECKING THE SPEED CONTROL SYSTEM Perform TEST SC 1A Before Proceeding TJ XJ BODY COLOR FUNCTION VACUUM SOLENOID CONTROL 5 VENT SOLENOID CONTROL S C BRAKE SWITCH OUTPUT GROUND 80b04fe4 1288 BRAKE LAMP SWITCH CONNECTOR BRAKE SWITCH SENSE GROUND 12 V
164. ANRESS CONNECTOR FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS REPLACE THE POWERTRAIN CONTROL MODULE REPAIR THE SENSOR SIGNAL FOR A SHORT TO THE SENSOR GROUND CIRCUIT 0 MOOO mr oUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 261 0 MOOO 22 TEST 153 REPAIRING BATTERY TEMP SENSOR VOLTAGE LOW TOO HIGH Perform TEST TC 153A Before Proceeding TJ XJ BODY 2 COLOR FUNCTION 1 BATTERY TEMP SENSOR SIGNAL 2 88VL SENSOR GROUND 80a5348d TJ XJ BODY BATTERY TEMPERATURE SENSOR CONNECTOR FUNCTION PK YL Battery Temp Sensor Signal BR YL Sensor Ground POWERTRAIN CONTROL MODULE CONNECTORS A4 BR YL Sensor Ground C15 PK YL BTS Signal 80498844 START TEST TC 153B KEY OFF DISCONNECT THE BATTERY TEMPERATURE SENSOR BTS CONNECTOR EST TC 153B REPAIRING BATTERY TEMP SENSOR VOLTAGE TOO LOW TOO HIGH Perform TEST TC 153A Before Proceeding KEY ON USE A VOLTMETER IN THE FOLLOWING STEP 5 SIGNAL CIRCUIT THE BTS HARNESS CONNECTOR FIG 1 5 ABOVE 5 5 VOLTS REPAIR BTS SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE IF OK REPLACE PCM CONNECT A JUMPER WIRE ACROSS THE SENSO
165. ANUAL PROCEDURE WAS THE BRAKE CHECK THE BRAKE SWITCH ADJUSTMENT SWITCH ADJUSTMENT OK ADJUST THE BRAKE SWITCH gt REPLACE THE BRAKE SWITCH Perform Verification TEST VER 4A Check connectors Clean repair as necessary 409 EST SC 1D CONTINUED CHECKING THE SPEED CONTROL SYSTEM TJ BODY XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS POWERTRAIN CONTROL MODULE GREY CONNECTOR VAC SOL CONTROL VENT SOL CONTROL 12 VOLT SUPPLY FUNCTION BRAKE SW SENSE SENSOR GROUND TN RD S C VACUUM SOLENOID CONTROL LG RD S C VENT SOLENOID YL RD 12 VOLT SUPPLY BRAKE WT PK BRAKE SWITCH SENSE LAMP SWITCH RD LG S C SWITCH SIGNAL CONNECTOR BRAKE LAMP SWITCH BRAKE SW SENSE CONNECTOR GROUND 12 VOLT SUPPLY BRAKE SWITGH SENSE S C BRAKE SW OUTPUT GROUND FUSED B 4 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT STOP LAMP SW OUTPUT BRAKE LAMP SWITCH OUTPUT 806661 FUSED 80b6b1cd TJ BODY XJ BODY BRAKE LAMP SWITCH CONNECTOR BRAKE LAMP SWITCH CONNECTOR FUNCTION 1 BRAKE SWITCH SENSE BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT FUSED B BRAKE LAMP SWITCH OUTPUT 80b099e1 410 GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED 80 80b04fe6 TEST SC 1D TEST SC 1D CONTINUED FROM THE PREVIOUS PAGE
166. ASD RELAY OUTPUT DOWNSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE 1 ASD RELAY OUTPUT 2 GROUND HEATER SENSOR GROUND 4 DOWNSTREAM OXYGEN SENSOR SIGNAL 80b118a8 360 0920606 POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND UPSTREAM OXYGEN SENSOR SIGNAL ASD RELAY OUTPUT UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR SIGNAL POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND DOWNSTREAM OXYGEN SENSOR SIGNAL ASD RELAY OUTPUT DOWNSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE 1 ASD RELAY OUTPUT 2 GROUND HEATER SENSOR GROUND 4 DOWNSTREAM OXYGEN SENSOR SIGNAL 80b118a9 TEST 10 CHECKING THE OXYGEN SENSOR SWITCHING Perform TEST NTC 10A Before Proceeding START TEST 10 ALLOW THE ENGINE TO IDLE INSPECT THE ENGINE FOR ANY ABNORMAL VACUUM CONDITIONS y NOTE REFER TO FIGURE 1 FOR INDICATORS OF POSSIBLE ENGINE MECHANICAL PROBLEMS gt ARE THERE ANY ABNORMAL VACUUM CONDITIONS REPAIR ABNORMAL ENGINE VACUUM CONDITION AS REQUIRED WITH THE DRB READ THE 1 1 AND 1 2 02 SENSOR VOLTAGES gt IS THE VOLTAGE BELOW 0 10 VOLTS FOR THE 1 1 OR 1 2 02 SENSOR c gt KEY OFF DISCONNECT THE 1 1 OR 1 2 02 SENSOR CONNECTOR THAT THE VOLTAGE IS BELOW
167. ATER SENSOR GROUND OXYGEN SENSOR SIGNAL 806861086 XJ BODY DOWNSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR SIGNAL 80660 0 5 126 THE PREVIOUS PAGE KEY OFF DISCONNECT THE 1 2 2 SENSOR HARNESS CONNECTOR m USE A VOLTMETER IN THE FOLLOWING STEP KEY ON MEASURE THE 1 2 02 SENSOR SIGNAL CIRCUIT BETWEEN THE 1 2 02 SENSOR HARNESS CONNECTOR AND GROUND FIG 1 OR 2 WAS THE VOLTAGE BETWEEN 4 0 AND 5 2 VOLTS EST 126 CONTINUED REPAIRING 1 2 2 SENSOR SHORTED TO VOLTAGE CONTINUE TEST TC 126A ON THE NEXT PAGE INSTALL A JUMPER WIRE FROM THE 1 2 02 SENSOR SIGNAL CIRCUIT TO THE SNESOR GROUND AT THE 1 2 02 SENSOR HARNESS CONNECTOR OBSERVE THE DRB FIG 1 OR 2 DID THE 1 2 02 SENSOR VOLTAGE DROP BELOW 1 0 VOLTS 35 REPLACE THE 1 2 O2 SENSOR MOVE THE JUMPER WIRE FROM THE SENSOR GROUND TO AN ENGINE GROUND OBSERVE THE DRB DID THE 1 2 O2 SENSOR VOLTAGE DROP BELOW 1 0 VOLTS REPAIR THE SENSOR GROUND CIRCUIT FOR AN OPEN REPLACE THE PCM Qo 0m MOOO mr oUco Perform Verification TEST VER 2A Check connectors Clean repair as necessary
168. ATIC IDLE POOR FUEL ECONOMY DIAGNOSTIC TEST ROUTINE NTC 4A 5A 6A 7A 8A 9A 10A 12A 13A 17A 18A 19A NTC 3A 5A 6A 7A 8A 9A 12A NO TROUBLE CODE COMPLETE TEST STEP 1 NTC 3A 5A 6A 7A 8A 9A 10A 12A 17A NTC 3A 5A 6A 7A 8A 9A 10A 12A 18A NTC 3A 5A 6A 7A 8A 9A 10A 12A 17A NTC 3A 5A 9A 10A 18A 10 18 NO TROUBLE CODE COMPLETE TEST STEP 1 NO TROUBLE CODE COMPLETE TEST STEP 1 343 0 40 4 MOOO mr ocozm oz TEST 2 CHECKING SECONDARY IGNITION AND TIMING Perform TEST NTC 1A Before Proceeding 0 400 4 MOOO mr ocozm oz 80 45 40 TYPICAL SCOPE PATTERN 2460401 45 40 90 80 60 55 50 45 40 35 30 TYPICAL SCOPE PATTERN 3250303 TEST 2 CHECKING SECONDARY IGNITION AND TIMING Perform TEST NTC 1A Before Proceeding START TEST NTC 2A KEY OFF NOTE IF THE NOTE SET THE CONNECT A SUITABLE ALLOW THE ENGINE ENGINE WILL NOT SCOPE TO READ ENGINE ANALYZER TO TO IDLE IDLE MAINTAIN A DISPLAY OR PARADE THE ENGINE CONSTANT RPM ABOVE PATTERN IDLE FOLLOW THE EQUIPMENT REPAIR THE MANUFACTURER S IS THE SECONDARY INDICATED PROCEDURE FOR IGNITION PATTERN m COMPONENT IN THE PATTERN ANALYSIS OK SECONDARY IGNITION FIG 1 2 SYSTEM 15 REMOVE ANY SPARK OBSERVE THE CIRCUIT SECONDARY REPLAC
169. AY OUTPUT CIRCUIT FOR RESISTANCE TO GROUND FIG 1 2 IS THE RESISTANCE ABOVE 5 0 OHMS REPLACE THE IGNITION COIL REPLACE FUSE DISCONNECT THE GENERATOR FIELD CONNECTOR MEASURE THE ASD RELAY OUTPUT CIRCUIT FOR RESISTANCE TO GROUND FIG 1 OR 2 IS THE RESISTANCE ABOVE 5 0 OHMS REPAIR GENERATOR FOR SHORT TO GROUND REPLACE FUSE CONTINUE TO MONITOR OHMMETER DISPLAY WHILE DISCONNECTING EACH FUEL INJECTOR Perform Verification TEST VER 1A Check connectors Clean repair as necessary 461 IS THE RESISTANCE ABOVE 5 0 OHMS WHEN ANY OF THE INJECTORS ARE DISCONNECTED REPLACE THE FUEL INJECTOR THAT CAUSED A CHANGE IN RESISTANCE REPLACE FUSE NO L REPAIR ASD RELAY OUTPUT CIRCUIT FOR A SHORT TO GROUND REPLACE FUSE gt 10 OZ gt 10 OZ TEST NS 6B REPAIRING REPONSE CONDITION Perform TEST NS 6A Before Proceeding TJ BODY XJ BODY DATA LINK CONNECTOR DATA LINK 1 COLOR COLOR 22550517 FUNCTION GROUND CCD Bus Ground GROUND SCI RECEIVE Power Ground SCI TRANSMIT ISO 9141K 501 CCD BUS Transmit FUSED B CCD Bus Fused B 80 4508 80 4 TJ BODY XJ BODY POWERTRAIN 4 POWERTRAIN CONTROL MODULE GR
170. B FUSED IGN SWITCH OUTPUT RUN START P FUSE 4 TO J IGNITION 10 AMP FUSE BLOCK FUSE 12 WT BK CCD BUS 3 CCD BUS 4 BK GROUND SWITCH TO OTHER MODULES BK LB GROUND SKIM MODULE 80b6f cc XJ BODY SENTRY KEY IMMOBILIZER MODULE XJ BODY ANTENNA DB GY Fused WT BK Fused Ign Switch Output Run Start TRANSPONDER CHIP IN KEY PDC 10 JUNCTION BLOCK 10 AMP WT BK CCD BUS VT BR CCD BUS BK LG Ground 6 JUNCTION BLOCK TO OTHER MODULES BK LG Ground SKIM MODULE 80b6f0d2 HARNESS CONNECTOR HARNESS CONNECTOR FUSED BATTERY SUPPLY GROUND FUSED IGNITION SWITCH OUTPUT CCD BUS CCD BUS FUNCTION FUSED BATTERY SUPPLY GROUND FUSED IGNITION SWITCH OUTPUT CCD BUS CCD BUS 80611874 80611875 308 1 5 5 SKIM COMMUNICATION Perform TEST SK 1A Before Proceeding USING THE DRB ATTEMPT TO COMMUNICATE WITH THE PCM CONTROL MODULE CAN YOU COMMUNICATE WITH THE PCM c REFER TO TEST NS 6A TO DIAGNOSE A RESPONSE CONDITION TURN IGNITION OFF DISCONNECT THE SKIM MODULE HARNESS CONNECTOR XX USING AN OHMMETER MEASURE THE GROUND CIRCUIT CAVS 2 AND 4 AT THE SKIM CONN FIG 1 OR 2 IS THE RESI
171. B READ THE ENGINE COOLANT TEMPERATURE ECT SENSOR VOLTAGE IS THE ECT SENSOR VOLTAGE ABOVE 4 5 VOLTS gt CONTINUE TEST TC 31A ON THE NEXT PAGE WIGGLE THE ENGINE COOLANT TEMP SENSOR CONNECTOR amp HARNESS OBSERVE THE DRB DISPLAY DID THE ECT SENSOR VOLTAGE CHANGE REPAIR THE HARNESS OR CONNECTOR THAT CAUSED THE VOLTAGE CHANGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES gt TEST COMPLETE 0 MOOO mr oUucom Perform Verification TEST VER 2A Check connectors Clean repair as necessary 121 0 MOOO CC TEST TC 31A CONTINUED REPAIRING ECT SENSOR VOLTAGE HIGH TJ BODY ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR TJ BODY CAV COLOR FUNCTION 1 TN BK ECT SENSOR SIGNAL 2 BR YL SENSOR GROUND 808580 POWERTRAIN CONTROL MODULE BLACK CONNECTOR CAV COLOR FUNCTION 4 BR YL SENSOR GROUND 16 ECT SENSOR SIGNAL TEMPERATURE SENSOR CONNECTOR CAV COLOR FUNCTION 1 TN BK ECT SE
172. B PK LB BK Rad Fan Rad Fan Ground Relay Control Relay Control 80561003 of Code Rad Fan Control Relay Circuit When monitored With the ignition key on and battery voltage greater than 10 4 volts Set condition An open or shorted condition is detected in the radiator fan relay control circuit Theory of operation The radiator fan relay controls the operation of the radiator fan The relay is located in the power distribution center One side of the relay control coil is supplied with 12 volts when the ignition switch is turned to the run position The circuit is completed when the other side of the relay coil is grounded by the powertrain control module The PCM grounds the relay control circuit depending on coolant temperature When the engine coolant temperature has reached the maximum temperature parameter the relay will be grounded Conversely when the engine coolant temperature has acquired the minimum temperature parameter the relay will remove the ground Possible causes Relay coil open or shorted Fused ignition switch output circuit open Low speed radiator fan relay control circuit open or shorted PCM failure Connector terminals Connector wires 4 32 TEST 14 REPAIRING RADIATOR FAN RELAY CIRCUIT Perform TEST DTC Before Proceeding START TEST USING THE DRB IS THE FAN CYCLING CONTINUE TEST 14 ON AND OFF gt RADIATOR
173. BEGIN NING VEHICLE DIAGNOSIS NOTE It is necessary to obtain the four digit Personal Identification Number PIN from the customer or the vehicle invoice The PIN is required to perform certain SKIM tasks using the DRB NOTE It is very important that the PCM is programmed with the correct Vehicle Identification Number VIN Incorrect VIN programming may result in incorrect diagnosis and unnecessary component replacement Use the DRB to verify the correct VIN and country code in the SKIM The battery must be fully charged for any test in this manual Attempt to start the engine Crank for up to 10 seconds if necessary Connect the DRB to the diagnostic connector and select Theft Alarm then SKIM If the DRB displays No Response perform test 1B NOTE If the DRB screen is blank or has a DRB error message displayed go to General Information Section 3 5 in this manual 4 With the DRB read and record SKIM trouble codes 5 diagnostic trouble code s are displayed refer to the diagnostic trouble code list on the next page for the appropriate test 307 lt zmo em o o JMN r e D I OH 2 2 vn lt MA zmo lt WMN r woZZ EST SK 1B SKIM COMMUNICATION Perform TEST SK 1A Before Proceeding TJ BODY SENTRY KEY IMMOBILIZER MODULE TJ BODY ANTENNA TN EK FUSED TRANSPONDER CHIP IN KEY cc FUSE BLOCK FUSE 1 e TO PDC D
174. CE BELOW 5 0 OHMS gt REPLACE THE POWERTRAIN CONTROL MODULE SENSOR SIGNAL CIRCUIT FOR AN 0 MOOO mr uUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 145 TEST 39 REPAIRING NO CHANGE MAP FROM START RUN Perform TEST DTC Before Proceeding TJ XJ BODY POWERTRAIN MANIFOLD GROUND CONTROL VACUUM TO OTHER MODULE SENSORS BR YL Sensor Ground DG RD Map Sensor Signal 457 5V Supply TO TP SENSOR 0 MOOO CC MAP SENSOR 80a4d2e2 Name of code Change in MAP From Start to Hun When monitored With engine rpm above 400 butless than 1500 and the throttle body at closed throttle Set condition To small difference is seen between barometric pressure at ignition on and manifold vacuum engine running for 1 72 seconds Theory of operation This sensor measures manifold absolute pres sure and ambient barometric pressure within the manifold It provides a 0 to 5 volt signal to PCM cavity A27 The MAP sensor puts out a low voltage signal 0 5 to 1 8 volts at idle when the manifold vacuum is high and a higher voltage signal 3 9 to 4 8 volts at deep throttle when the manifold vacuum is low The MAP receives a 5 volt supply from PCM cavity A17 voltage may vary from 4 8 to 5 1 volts The sensor ground is provided by P
175. CM cavity A4 Possible causes gt Restricted or leaking vacuum pressure to MAP sensor gt Ice sensor or passage gt Failed sensor Failed PCM 3470403 5 39 5 5 39 REPAIRING CHANGE FROM START RUN Perform TEST DTC Before Proceeding TURN IGNITION ON ENGINE OFF WITH THE DRB READ CODES IS MAP SENSOR VOLTAGE TOO LOW CODE SET c gt WITH THE DRB ERASE CODES START ENGINE AND ALLOW ENGINE TO IDLE FOR 30 SECONDS WITH THE DRB READ CODES DOES THE DRB DISPLAY NO CHANGE IN MAP FROM START TO RUN NOTE THE ENGINE IS STILL RUNNING WITH THE DRB SET THE ENGINE SPEED TO 1500 RPM 1 5 PERFORM TEST TC 36A CONTINUE TEST TC 39A ON NEXT PAGE WITH THE ENGINE RPM AT 1500 READ MAP SENSOR VOLTAGE WHILE MONITORING THE VOLTAGE WIGGLE THE WIRING FROM THE MAP SENSOR TO THE PCM DID THE ENGINE STALL OR VOLTAGE BECOME ERRATIC REPAIR THE WIRING OR CONNECTOR DEFECT BETWEEN THE MAP SENSOR AND THE STOP ACTUATION WHILE MONITORING THE DRB DISPLAY SNAP THE THROTTLE OPEN AND CLOSED DID THE VACUUM DROP RAPIDLY BELOW 1 02 I 39 AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT TEST COMPLETE FIG
176. CONNECTOR COLOR FUNCTION PK BK EVAP SOLENOID CONTROL 80b76e96 FIG 4 18 5 5 18 REPAIRING PURGE SOLENOID CIRCUIT Perform TEST DTC Before Proceeding USING THE DRB ACTUATE THE EVAP SLOENOID IS THE EVAP SOLENOID CLICKING c CONTINUE TEST TC 18A ON THE NEXT PAGE DISCONNECT THE EVAP SOLENOID HARNESS CONNECTOR XX y KEY ON USING A VOLTMETER MEASURE THE FUSED IGNITION SW OUTPUT CIRCUIT FIG 1 OR 2 IS THE VOLTAGE ABOVE 10 0 VOLTS REPAIR THE OPEN THE FUSED IGNITION SWITCH OUTPUT CIRCUIT NOTE DRB STILL ACTUATING THE EVAP SOLENOID USING TEST LIGHT CONNECT ONE END OF THE TEST LIGHT TO THE FUSED IGN SW OUTPUT CIRCUIT THE OTHER END TO THE EVAP SOL CONTROL CKT AT THE EVAP SOLENOID HARNESS CONNECTOR FIG 1 OR 2 gt DOES THE TEST LIGHT FLASH ON AND OFF 18 STOP THE SOLENOID FROM ACTUATING DISCONNECT THE PCM HARNESS CONNECTOR USING AN MEASURE THE RESISTANCE OF EVAP SOLENOID CONTROL CKT FIG 3 OR 4 gt 15 5 5 5 0 5 REPAIR THE OPEN THE EVAP SOLE
177. CORDED FROM THE PCM MATCH THE VIN OF THE VEHICLE YES REPLACE THE SKIM MODULE REPROGRAM THE CORRECT VIN INTO THE PCM NOTE THE VIN CANNOT BE PROGRAMMED INTO THE SKIM MODULE Perform Verification TEST VER 1A USING THE DRB DISPLAY AND RECORD THE VIN THAT IS PROGRAMMED INTO THE SKIM MODULE DOES THE VIN RECORDED FROM THE SKIM MODULE MATCH THE VIN OF THE VEHICLE REPLACE THE SKIM MODULE YES TEST COMPLETE Check connectors Clean repair as necessary 341 lt MA lt 120 lt JMN r e D I OH 2 2 MOOO oz TEST NTC 1A NO TROUBLE CODE TEST MENU Perform TEST DTC Before Proceeding NOTE For all component locations REFER TO GENERAL INFORMATION SECTION 4 0 in this manual First check all Technical Service Bulletins that relate to this problem Perform corrective actions if indicated otherwise continue Second read Diagnostics Trouble Codes and repair any Diagnostic Trouble codes before continuing 1 No Trouble Code Complete Test non monitored circuits and monitored circuits Perform Tests NTC 2A through NTC 19A in sequence for Driveability problem No Trouble Code Quick Individual Test If you suspect a symptom is directly related to a component or system perform the associated NTC Test s individually Symptom check cannot be used pr
178. CTOR ONLY 5 5 5V SIGNAL FOR VOLTAGE AT THE ON OFF SWITCH 2 CONN FIG 1 IS THE VOLTAGE ABOVE 6 0 VOLTS 5 SWITCH SIGNAL FOR A SHORT TO VOLTAGE TURN THE IGNITION KEY OFF WAIT ONE MINUTE USING OHMMETER MEASURE THE S C SWITCH GROUND CKT AT THE ON OFF SWITCH 2 WAY CONN FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN GROUND CKT TO SPEED CONTROL SWITCH DISCONNECT THE PCM USE AN OHMMETER IN ALL THE FOLLOWING STEPS 5 SWITCH SIGNAL PCM TO SC ON OFF SWITCH CONNECTOR FIG 2 IS THE RESISTANCE BELOW 5 0 OHMS RESISTANCE ACROSS THE S C ON OFF SWITCH WITH SWITCH PRESSED CONTINUE TEST TC 86A ON THE NEXT PAGE Perform Verification TEST VER 4A Check connectors Clean repair as necessary 195 IS THE RESISTANCE BELOW 1 0 OHM REPLACE POWERTRAIN CONTROL MODULE L REPLACE THE ON OFF SWITCH MOOO mr oUuco MOOO CC MV TEST 86 CONTINUED REPAIRING SPEED CONTROL SWITCH ALWAYS HIGH SPEED CONTROL POWERTRAIN i CONTROL L _ _ SEI eng MODULE BR YL SENSOR GRCUND RD
179. CUIT THE STARTER RELAY CONN FIG 1 OR 2 gt WHILE OBSERVING VOLTMETER HOLD IGNITION KEY IN THE START POSITION IS THE VOLTAGE ABOVE 10 0 VOLTS IGNITION SWITCH OUTPUT WARNING KEY OFF THE TRANS MUST BE IN PARK AND THE PARKING BRAKE MUST BE ON FOR THE NEXT STEP WARNING THE ENGINE MAY BE CRANKED IN THE NEXT STEP KEEP AWAY FROM MOVING ENGINE PARTS gt BRIEFLY CONNECT A JUMPER WIRE BETWEEN STARTER RLY FUSED 8 OUTPUT 5 FIG 1 2 PERFORM TEST NS 9C Perform Verification TEST VER 1A Check connectors Clean repair as necessary 481 3 40 OZ TEST 5 98 REPAIRING NO CRANK CONDITION Perform TEST NS 9A Before Proceeding TJ BODY POWER DISTRIBUTION CENTER PDC RELAY SECTION STARTER RELAY 0 40 4 3 40 OZ FUNCTION FUSED B IGNITION SWITCH OUTPUT PARK NEUTRAL SWITCH SENSE AUTO TRANS GROUND MANUAL TRANS STARTER RELAY OUTPUT 8056107 XJ BODY POWER DISTRIBUTION CENTER PDC 2 STARTER RELAY RELAY SECTION CONNECTOR FUSED B P N POSITION SWITCH SENSE AUTO TRANSMISSION GROUND MANUAL TRANSMISSION FUSED IGNITION SWITCH OUTPUT
180. D 1 CONNECTORS REFER GENERAL INFORMATION 3 3 2 FOR ADDITIONAL TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 1A Check connectors Clean repair as necessary 323 lt MA lt 120 lt mN r uozzz TEST SK 5A CONTINUED REPAIRING TRANSPONDER COMMUICATION FAILURE L MOLDED TRANSPONDER 7 ezm o o DWMN r woss lt MA uUu zmo MOLDED CAP REMOVED SENTRY KEY 80b6h145 TEST SK 5A TEST SK 5A CONTINUED FROM THE PREVIOUS PAGE USING THE DRB ATTEMPT TO REPROGRAM THE IGNITION KEY TO THE SKIM MODULE SEE GENERAL INFO 8 0 CONTINUED REPAIRING TRANSPONDER COMMUICATION FAILURE USING THE DRB CLEAR CODES TURN IGNITION OFF WAIT 10 SECONDS TURN IGNITION ON AND CHECK CODES DOES THIS CODE SET TEST COMPLETE REPLACE IGNITION KEY WITH A KNOWN GOOD KEY USING THE DRB PROGRAM THE KNOWN gt GOOD IGNITION KEY THE SKIM MODULE SEE GENERAL INFO 8 0 USING THE DRB CLEAR CODES TURN IGNITION OFF WAIT 10 SECONDS TURN IGNITION ON AND CHECK CODES DOES THIS CODE SET TEST COMPLETE Perform Verification TEST VER 1A
181. D OUTPUT CIRCUIT FIG 1 OR 2 RESISTANCE OF THE IS THE RESISTANCE REPLACE THE BRAKE S C BRAKE SWITCH BELOW 5 0 OHMS LAMP SWITCH OUTPUT CIRCUIT FIG 3 OR 4 REPAIR THE OPEN IN THE S C BRAKE SWITCH OUTPUT CIRCUIT Perform Verification TEST VER 4A Check connectors Clean repair as necessary MOOO mr oUuco TEST 15 REPAIRING SPEED CONTROL CIRCUITS Perform TEST TC 15A Before Proceeding TJ XJ BODY SPEED CONTROL SERVO CONNECTOR MOOO mr uUuco FUNCTION 80b0d705 TJ XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS FUNCTION SENSOR GROUND S C VACUUM SOL CONTROL S C VENT SOL CONTROL 12 VOLT SUPPLY BRAKE SWITCH SENSE S C SWITCH SIGNAL 15 5 5 TO 1I5HB TURN IGNITION OFF REPAIRING SPEED CONTROL CIRCUITS Perform TEST TC 15A Before Proceeding USING AN OHMMETER MEASURE THE GROUND CIRCUIT AT y THE S C SERVO 4 WAY HARNESS CONNECTOR 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN SERVO GROUND CIRCUIT WITH AN OHMMETER PERFORM THE FOLLOWING MEASUREMENTS TO GROUND SPEED CONTROL VENT SOL CKT AND SPEED CONTROL VACUUM SOL CKT FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS F
182. DB UE FUSED IGN SWITCH OUTPUT RUN START p IGNITION 10 AMP SWITCH WT BK CCD BUS 3 TO OTHER R CCD BUS MODULES BK GROUND GROUND 80b6f cc Name of code Transponder ID Mismatch When monitored With the ignition on and during key programming operation Set condition The SKIM receives a transponder ID that does not match any ID stored in SKIM memory Theory of operation When the ignition is turned on or during key programming the SKIM attempts to power up the transponder The SKIM makes up to three attempts to communicate with the transponder The SKIM checks for proper communication format and valid data from the transponder Possible cause Invalid key Failed transponder Failed SKIM 80b5cc73 330 REPAIRING TRANSPONDER ID MISMATCH XJ BODY SENTRY KEY IMMOBILIZER MODULE ANTENNA DB GY Fused B WT BK Fused Ign Switch Output Run Start TRANSPONDER PDC 10 AMP PDC JUNCTION BLOCK 10 AMP 6 8 JUNCTION WT BK CCD BUS VT BR CCD BUS BK LG Ground BLOCK TO OTHER MODULES BK LG Ground 8066092 TRANSPONDER MOLDED CAP REMOVED 80665145 TEST SK 7A REPAIRING TRANSPONDER ID MISMATCH Perform TEST SK 1A Before Proceeding START TEST SK 7A TURN IGNITION OFF USING THE DRB DOES THE DRB CONTINUE TEST WAIT 10 SECONDS READ CODES gt DISPLAY THIS CODE gt 5
183. DC 10 FUSE 4 DB FUSED IGN SWITCH qu uH TO OUTPUT RUN START IGNITION 10 AMP SWITCH WT BK CCD BUS R TO OTHER CCD BUS MODULES BK GROUND BK LB GROUND 80b6f0cc SENTRY KEY ANTENNA TRANSPONDER IMMOBILIZER MODULE DB GY PDC Fused B DAME gt 806 WT BK JUNCTION BLOCK Fused Ign Switch 10 AMP Output Run Start 6 JUNCTION WT BK BLOCK CCD BUS TO vier OTHER BK LG Ground BK LG Ground 2 8066092 of code VIN Mismatch When monitored With the ignition on Set condition The VIN received from the PCM does not match the VIN stored in the SKIM EEPROM Theory of operation The PCM broadcasts the Vehicle Identification Number VIN on the CCD BUS The SKIM receives and compares this number to the number stored in SKIM EEPROM Possible cause gt Incorrect VIN stored in PCM memory Incorrect VIN stored in SKIM memory Failed SKIM 80b5cc77 FIG 1 338 TEST 5 9 REPAIRING VIN MISMATCH Perform TEST SK 1A Before Proceeding START TEST SK 9A TURN IGNITION OFF WAIT 10 SECONDS TURN IGNITION ON USING THE DRB READ CODES I DOES DISPLAY THE DRB THIS CODE 5 SK 9A ON THE NEXT PAGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRES
184. DG B10 GEN FIELD DRIVER MOOO mr uUco 80b6f0cd Name of code Charging System Voltage Too High When monitored With the ignition key on and the engine speed greater than RPM Set condition When the PCM regulates the generator field and there are no detected field problems but the voltage output does not decrease Theory of operation The PCM tries to maintain a system voltage between 12 9 volts and 15 0 volts The voltage determined by the PCM as the final goal for the charging system is called control voltage This control voltage is determined from the battery temp sensor ambient sensor The control voltage is compared to the sensed voltage continuously during running The PCM controls battery voltage by energizing and de energizing the alternator field winding When the battery voltage falls below a setpoint voltage the generator field winding is energized until the battery voltage exceeds a setpoint voltage Possible causes gt Generator internal short gt Generator field driver short to ground gt PCM failure 80aa0ff2 GENERATOR FIELD HARNESS CONNECTOR DG GENERATOR FIELD 80060126 5 5 TC 6A REPAIRING CHARGING SYSTEM VOLTAGE TOO HIGH Perform TEST DTC Before Proceeding DISCONNECT THE GENERATOR FIELD DRIVER HARNESS CONNECTOR WITH THE DRB ACTUATE THE GENERATOR FIELD DRIVER
185. DY ASD POWER DISTRIBUTION CENTER PDC RELAY SECTION FRONT FUNCTION RD WT DG PK FUSED B 4 AUTO SHUTDOWN RELAY OUTPUT IGNITION SWITCH OUTPUT 3 86 DB DB YL AUTO SHUTDOWN RELAY CONTROL 80b6f1 09 TJ BODY POWER DISTRIBUTION CENTER PDC RELAY SECTION FUEL PUMP RELAY L 20 D 17 m FRONT 16 rrr COLOR DG BK FUNCTION FUSED DG WT FUEL PUMP RELAY OUTPUT 18 86 DB FUSED IGNITION SWITCH OUTPUT BR FUEL PUMP RELAY CONTROL 80661069 TJ BODY POWER DISTRIBUTION CENTER PDC RELAY SECTION STARTER RELAY FRONT gt CAV COLOR PK BK YL RD BR LB FUNCTION FUSED B 4 IGNITION SWITCH OUTPUT PARK NEUTRAL
186. E ASD RELAY BETWEEN THE REPAIR THE INJECTOR STILL ACTUATING INJECTOR HARNESS IS THE VOLTAGE 5 DRIVER CIRCUIT USING A VOLTMETER CONNECTOR AND ABOVE 1 0 VOLTS gt 5 MEASURE THE INJECTOR GROUND VOLTAGE IF OKAY DRIVER CIRCUIT FIG 1 REPLACE PCM KEY OFF USING AN OHMMETER REPAIR THE DISCONNECT THE PCM MEASURE THE IS THE RESISTANCE INJECTOR 5 DRIVER HARNESS INJECTOR 45 DRIVER BELOW 5 0 OHMS gt CIRCUIT FOR CONNECTORS CIRCUIT TO GROUND SHORT TO GROUND FIG 2 USING AN OHMMETER BETWEEN THE REPAIR THE MEASURE ACROSS THE POWERTRAIN CONTROL IS THE RESISTANCE INJECTOR 5 DRIVER INJECTOR 45 DRIVER MODULE AND THE m BELOW 5 0 OHMS 69 gt CIRCUIT FOR AN CIRCUIT INJECTOR OPEN FIG 2 CONNECTOR REPLACE THE gt POWERTRAIN CONTROL MODULE Perform Verification TEST VER 2A Check connectors Clean repair as necessary 183 0 MOOO 0 0 70 0 MOOO CC TEST 70 REPAIRING INJECTOR 6 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding INJECTOR 6 CONNECTOR 80b76e6c INJECTOR 6 CONNECTOR COLOR FUNCTION 1 DG LG 50 RELAY OUTPUT 1 DG OR ASD RELAY OUTPUT XJ 2 LG BK INJECTOR 6 DRIVER POWERTRAIN CONTROL MODULE CONNECTORS CAV COLOR FUNCTION B12 LG BK INJECTOR 6 DRIVER
187. E BLOCK FUSED B 4 oe TO PDC 10 AMP FUSE 4 FUSED IGN SWITCH OUTPUT RUN START IGNITION 10 AMP SWITCH WT BK CCD BUS TO OTHER CCD BUS MODULES BK GROUND BK LB 80b6f0cc SENTRY KEY ANTENNA TRANSPONDER IMMOBILIZER CHIP MODULE IN KEY e DB GY PDC FusedB ZA WT BK JUNCTION BLOCK Fused Ign Switch 10 AMP Output Run Start 67 0 gt JUNCTION WT BK BLOCK CCD BUS T Vren OTHER CCD BUS MODULES BK LG Ground BK LG Ground 8066092 of code Invalid or Wrong Key Message From SKIM When Monitored With ignition on Set Condition The PCM does not receive a valid key message from the SKIM module Theory of operation At ignition on the module sends message to the PCM verifying the correct ignition key If the PCM receives a correct message it will allow the engine to start and continue to run If the PCM does not receive a message or receives an incorrect message the PCM will allow the engine to start and run for two seconds If the PCM does not receive a valid key message in six start attempts the PCM will disable the starter relay until a valid message is received Possible causes Ignition key not programmed Wrong ignition key Incorrect VIN stored in PCM Failed SKIM module Failed PCM 80b118e7 FIG 1 5 5 232 WITH THE DRB ERASE CODES
188. E OIL PRESSURE SENSOR CONNECTOR MOOO mr uUuco FUNCTION 5 VOLT SUPPLY TJ 5 VOLT SUPPLY XJ OIL PRESSURE SENSOR SIGNAL SENSOR GROUND 80b8b37t EST 235 CONTINUED REPAIRING OIL PRESSURE SENSOR LOW EXCEEDED TEST TC 235A CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE OIL PRESSURE SENSOR HARNESS CONNECTOR KEY ON USE A VOLTMETER IN THE FOLLOWING STEP MEASURE THE VOLTAGE OF THE OIL PRESSURE SENSOR SIGNAL FIG 1 gt 15 BETWEEN 4 8 AND 5 3 VOLTS gt REPLACE THE OIL PRESSURE SENSOR KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS XX USE THE FOLLOWING STEPS MEASURE THE RESISTANCE OF EEN OIL PRESSURE SENSOR SIGNAL CIRCUIT TO GROUND 15 5 5 BELOW 5 0 OHMS REPAIR THE SHORT TO GROUND IN THE OIL PRESSURE SENSOR SIGNAL CIRCUIT MEASURE THE RESISTANCE BETWEEN THE gt OIL PRESSURE SENSOR SIGNAL CKT AND THE SENSOR GROUND CKT 1 gt IS THE RESISTANCE BELOW 5 0 OHMS YES REPAIR THE OIL PRESSURE SENSOR gt SIGNAL CIRCUIT FOR A SHORT TO THE SENSOR GROUND CIRCIUT
189. E PCM FIG 1 LS IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE CMP SENSOR SIGNAL CIRCUIT FOR AN RESISTANCE OF THE CMP SENSOR SIGNAL CIRCUIT SENSOR CONNECTOR AND THE SENSOR GROUND FIG 1 gt IS THE RESISTANCE BELOW 5 0 OHMS SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE SENSOR GROUND MEASURE THE RESISTANCE OF THE CMP SENSOR SIGNAL CIRCUIT BETWEEN THE CMP SENSOR CONNECTOR AND GROUND FIG 1 3 IS THE RESISTANCE BELOW 5 0 OHMS gt gt SENSOR SIGNAL CIRCUIT FOR A SHORT GROUND MEASURE THE RESISTANCE BETWEEN THE CMP SENSOR SIGNAL CIRCUIT AND THE 5 VOLT SUPPLY CIRCUIT AT THE CMP SENSOR CONNECTOR 2 gt IS THE RESISTANCE BELOW 5 0 OHMS YES REPAIR THE CMP SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE 5 VOLT SUPPLY CIRCUIT Perform Verification TEST VER 2A Check connectors Clean repair as necessary 2 REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO 22 1 REPAIRING SIGNAL TYPICAL DISTRIBUTOR CAP MOOO mr uUuco 10703
190. E READ MANIFOLD VACUUM REPAIR THE VACUUM SUPPLY FOR A LEAK OR RESTRICTION TURN ENGINE OFF OBSERVE THE VACUUM GAUGE FOR 10 SECONDS Perform Verification TEST VER 4A Check connectors Clean repair as necessary 405 DOES THE VACUUM HOLD FOR AT LEAST 10 0 SECONDS gt REPLACE THE VACUUM RESERVOIR PERFORM TEST 8 1 104200 TEST SC 1C CHECKING THE SPEED CONTROL SYSTEM Perform TEST SC 1A Before Proceeding TJ XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS 4 SENSOR GROUND S C VACUUM SOL CONTROL S C VENT SOL CONTROL 12 VOLT SUPPLY BRAKE SWITCH SENSE S C SWITCH SIGNAL SPEED CONTROL SERVO CONNECTOR Qo 4Q0m BK GROUND 80609952 TJ XJ BODY SPEED CONTROL SERVO CONNECTOR S C VACUUM SOLENOID CONTROL S C VENT SOLENOID CONTROL S C BRAKE SWITCH OUTPUT GROUND 80b04fe4 TEST SC 1C CHECKING THE SPEED CONTROL SYSTEM Perform TEST SC 1A Before Proceeding START TEST INSPECT THE IS THE CABLE REPAIR AS Sc 1C THROTTLE CABLE gt DISCONNECTED OR NECESSARY DAMAGED 2 KEY OFF DISCONNECT DISCONNECT THE THE SPEED CONTROL POWERTRAIN CONTROL SERVO 4 WAY HARNESS MODULE HARNESS CONNECTOR CONNECTOR USING AN OHMMETER FROM PCM CONNECTOR REPAIR THE OPEN MEASURE THE TO S C SERVO IS THE RESIST
191. E THE PLUG WIRE SECONDARY KV LINE VOLTAGE AT LEAST ELECTRONIC 25KV IGNITION COIL SECONDARY REINSTALL THE IGNITION AND SPARK PLUG WIRE gt TIMING ADV NORMAL TEST PASSED Perform Verification TEST VER 2A Check connectors Clean repair as necessary 345 MOOO mr ocozm oz 0 MOOO mr ocoz oz TEST NTC 3A CHECKING THE PCM POWER AND GROUND CIRCUITS Perform TEST NTC 1A Before Proceeding TJ BODY POWERTRAIN CONTROL MODULE TO IGN SWITCH START RUN 2 IGNITION SWITCH OUTPUT BR YL SENSOR GROUND SENSORS RD IN PDC 80 80b76ef3 TJ BODY POWERTRAIN CONTROL MODULE BLACK CONNECTOR COLOR 2 A4 BR YL A22 RD WT A31 BK TN A32 BK TN FUNCTION IGNITION SWITCH OUTPUT SENSOR GROUND FUSED B GROUND GROUND 80b76ef5 346 XJ BODY POWERTRAIN CONTROL MODULE TO IGN gt SWITCH START RUN 2 IGNITION SWITCH OUTPUT BR YL SENSOR GROUND SENSORS DG BK IN PDC B To BATTERY 80b76ef4 XJ BODY POWERTRAIN CONTROL MODULE BLACK CONNECTOR FUNCTION IGNITION SWITCH OUTPUT SENSOR GROUND FUSED B GROUND GROUND 80aatae7 TEST CHECKING THE PCM POWER AND GROUND CIRCUITS Perform TEST NTC 1A Before Proceeding START TEST NTC 3A
192. EASURE THE OIL PRESSURE SIGNAL CKT TO GROUND FIG 3 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SHORT TO GROUND IN THE OIL PRESSURE SIGNAL CIRCUIT REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 389 0 400 4 MOOO mr ocoz oz TEST NTC 21A CONTINUED CHECKING OIL PRESSURE SENDING UNIT TJ XJ BODY ENGINE OIL PRESSURE SENSOR CONNECTOR FUNCTION 5 VOLT SUPPLY TJ 5 VOLT SUPPLY XJ OIL PRESSURE SENSOR SIGNAL SENSOR GROUND 80656371 TJ XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND OR 5 VOLT SUPPLY B24 GY YL OIL PRESSURE SENSOR SIGNAL ENGINE OIL PRESSURE SENSOR CONNECTOR 5 VOLT SUPPLY TJ 5 VOLT SUPPLY XJj OIL PRESSURE SENSOR SIGNAL SENSOR GROUND 5 21 CONTINUED FROM PREVIOUS PAGE EST NTC 21A CONTINUED CHECKING OIL PRESSURE SENDING UNIT USING AN OHMMETER MEASURE THE SENSOR GROUND CKT TO GROUND FIG 1 IS THE RESISANCE BELOW 5 0 OHMS REPAIR THE OPEN THE SENSOR GROUND CIRCUIT USING A VOLTMETER MEASURE THE 5 VOLT SUPPLY CIRCUIT FIG 1 IS THE VOLT ABOVE 4 0 VOLTS CONTINUE TEST NTC 21A ON THE NEXT PAGE DISCONNECT THE POWERTRAIN CONTROL MODULE HARNES
193. ECTOR IN PDC FUSED B AUTO SHUTDOWN RELAY OUTPUT IGNITION SWITCH OUTPUT AUTO SHUTDOWN RELAY CONTROL POWERTRAIN CONTROL MODULE GREY CONNECTOR COLOR FUNCTION C3 DB YL AUTO SHUTDOWN RELAY CONTROL C12 DG PK AUTO SHUTDOWN RELAY OUTPUT 801278890 XJ BODY AUTO SHUTDOWN RELAY CONNECTOR IN POWERTRAIN CONTROL MODULE GREY CONNECTOR C3 DB YL AUTO SHUTDOWN RELAY CONTROL C12 DG OR AUTO SHUTDOWN RELAY OUTPUT sozecos 5 44 CONTINUED FROM THE PREVIOUS PAGE EST TC 44A CONTINUED REPAIRING ASD RELAY OUTPUT VOLTAGE DISCONNECT THE AUTO SHUTDOWN ASD RELAY USING A VOLTMETER MEASURE THE FUSED B CIRCUIT FIG 1 OR 2 IS THE VOLTAGE ABOVE 10 0 VOLTS REPAIR THE FUSED B CIRCUIT FOR AN OPEN INSTALL A SUBSTITUTE RELAY FOR THE ASD RELAY ATTEMPT TO START THE VEHICLE DID THE ENGINE START REPLACE THE ORIGINAL AUTO SHUTDOWN RELAY KEY OFF DISCONNECT THE PCM HARNESS CONNECTOR USING AN OHMMETER MEASURE THE RESISTANCE OF THE ASD RELAY OUTPUT CIRCUIT BETWEEN THE RELAY AND THE PCM FIG 1 OR 2 gt IS THE RESISTANCE ABOVE 5 0 OHMS REPAIR THE ASD RELAY OUTPUT CIRCUIT FOR AN OPEN MEASURE THE ASD RELAY OUTPUT CIRCUIT FROM T
194. ED BELOW 5 0 OHMS FOR A SHORT TO GROUND RECONNECT THE S C SERVO HARNESS CONNECTOR DISCONNECT THE PCM HARNESS CONNECTOR USE AN OHMMETER IN THE FOLLOWING STEPS 55 5 11 5 2 IS THE RESISTANCE BETWEEN 35 0 AND 55 0 OHMS MEASURE BETWEEN PCM HARNESS CONNECTOR CAVITIES C11 AND FIG 2 IS THE RESISTANCE BETWEEN 35 0 AND 55 0 OHMS YES c gt CONTINUE TEST TC 82A ON THE NEXT PAGE CONTINUE TEST TC 82A ON THE NEXT PAGE REPALCE THE POWERTRAIN CONTROL MODULE 0 MOOO CC Perform Verification TEST VER 4A Check connectors Clean repair as necessary 189 0 MOOO mr oUcom TEST TC 82A CONTINUED REPAIRING SPEED CONTROL POWER RELAY OR SPEED CONTROL 12V DRIVER CIRCUIT TJ XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND S C VACUUM SOL CTRL S C VENT SOL CONTROL 12 VOLT SUPPLY BRAKE SWITCH SENSE S C SWITCH SIGNAL SPEED CONTROL SERVO CONNECTOR LG RD S C VENT SOLENOID CTRL DB RD 5 BRAKE SW OUTPUT GROUND 806041685 TEST 82 5 82 CONTINUED FROM THE PREVIOUS PAGE DISCONNECT THE S C SERVO 4 WAY CONNECTOR
195. ELAY USING TEST LIGHT CONNECTED TO GROUND PROBE THE ASD RELAY OUTPUT CIRCUIT FIG 1 2 DOES THE TEST LIGHT ILLUMINATE REPAIR THE ASD RELAY OUTPUT CIRCUIT FOR AN OPEN WITH THE ASD RELAY STILL ACTUATED USING A VOLTMETER MEASURE THE INJECTOR DRIVER CIRCUIT BETWEEN THE INJECTOR HARNESS CONNECTOR AND GROUND FIG 1 2 IS THE VOLTAGE ABOVE 1 0 VOLTS 4 DRIVER CIRCUIT FOR A SHORT TO VOLTAGE IF OKAY REPLACE KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS USING MEASURE THE INJECTOR 4 DRIVER CIRCUIT TO GROUND FIG 1 2 IS THE RESISTANCE BELOW 5 0 OHMS I 39 REPAIR THE INJECTOR 4 DRIVER CIRCUIT FOR A SHORT TO GROUND WITH AN OHMMETER MEASURE ACROSS THE INJECTOR 4 DRIVER CIRCUIT FIG 3 OR 4 FROM THE POWERTRAIN CONTROL MODULE TO THE INJECTOR CONNECTOR IS THE RESISTANCE BELOW 5 0 OHMS INJECTOR 4 DRIVER CIRCUIT FOR AN OPEN Perform Verification TEST VER 2A Check connectors Clean repair as necessary 175 L REPLACE THE POWERTRAIN CONTROL MODULE MOOO mr oUuco MOOO CC
196. EN Qo 0m MOOO mr oUco 4 MOOO mr uUuco TEST TC 61A REPAIRING INJECTOR 44 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding INJECTOR 4 INJECTOR 4 CONNECTOR CONNECTOR DG LG ASD RELAY OUTPUT TJ ASD RELAY OUTPUT TJ ASD RELAY OUTPUT XJ DG OR ASD RELAY OUTPUT XJ INJECTOR 4 DRIVER INJECTOR 4 DRIVER T 8057 INJECTOR 4 5 INJECTOR 4 CONNECTOR CONNECTOR 1 4 COLOR FUNCTION COLOR FUNCTION 1 1 2 DG LG ASD RELAY OUTPUT TJ 1 DG LG ASD RELAY OUTPUT TJ DG OR ASD RELAY OUTPUT XJ 1 DG OR ASD RELAY OUTPUT XJ LB BR INJECTOR 4 DRIVER 2 LB BR INJECTOR 4 DRIVER POWERTRAIN POWERTRAIN CONTROL MODULE d CONTROL MODULE CONNECTORS lt Ke SOY CONNECTORS COLOR FUNCTION COLOR FUNCTION B16 LB BR INJECTOR 4 DRIVER B16 LB BR INJECTOR 4 DRIVER C12 DG PK ASD RELAY OUTPUT TJ C12 DG PK ASD RELAY OUTPUT TJ C12 DG OR ASD RELAY OUTPUT XJ 80b76ea5 C12 DG OR ASD RELAY OUTPUT XJ 80b76ea9 174 61 5 5 61 DISCONNECT THE INJECTOR 4 CONNECTOR USING AN OHMMETER MEASURE RESISTANCE OF INJECTOR 4 REPAIRING INJECTOR 4 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding IS THE RESISTANCE BETWEEN 10 0 AND 16 0 OHMS REPLACE THE FUEL INJECTOR KEY ON USING THE DRB ACTUATE THE AUTO SHUTDOWN R
197. ENSOR INSPECT TP SENSOR WIRE COLORS FOR THE CORRECT CAVITIES FIG 1 EST TC 132A CONTINUED REPAIRING TPS VOLTAGE DOES NOT AGREE WITH MAP IS ANY TERMINAL DAMAGED PUSHED OUT OR CORRODED gt CLEAN OR REPAIR CONNECTOR AS NECESSARY WITH A VOLTMETER MEASURE THE 5 VOLT SUPPLY CIRCUIT FIG 1 IS THE VOLTAGE BELOW 5 0 VOLTS REPAIR THE OPEN 5 VOLT SUPPLY CIRCUIT TO TP SENSOR RECONNECT THROTTLE POSITION SENSOR CONNECTOR TURN IGNITION ON ENGINE OFF WITH THE DRB READ THE THROTTLE POSITION SENSOR VOLTAGE IS THE THROTTLE POSITION SENSOR VOLTAGE ABOVE 1 0 VOLTS gt REPLACE THROTTLE POSITION SENSOR CONTINUE TEST gt 132 ON THE NEXT PAGE 0 MOOO mr oUco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 235 TEST 132 CONTINUED REPAIRING TPS VOLTAGE DOES NOT AGREE WITH POWERTRAIN GROUND CONTROL THROTTLE SENSORS POSITION SENSOR MOOO CC M BR YL SENSOR GROUND OR DB TP SENSOR GROUND OR 5V SUPPLY TO OTHER SENSORS 80b0d637 TEST 132 CONTINUED REPAIRING TPS VOLTAGE DOES AGREE WITH TEST 132 WHILE MONITORING CONTINUED FROM THE DRB SLOWLY THE PREVIOUS OPEN AND CLOSE THE
198. ENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER GENERAL INFORMATION 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES TEST COMPLETE lt MA lt 120 lt mN r uozzz Perform Verification TEST VER 1A Check connectors Clean repair as necessary 339 lt MA zmo lt HPN sc E e D I OH S 2 TEST SK 9A CONTINUED REPAIRING VIN MISMATCH TJ BODY XJ BODY SENTRY KEY IMMOBILIZER MODULE SENTRY KEY IMMOBILIZER MODULE ANTENNA FUSED FUSED IGN SWITCH OUTPUT RUN START CCD BUS VT BR CCD BUS GROUND ANTENNA Fused Ign Switch Output Run Start Ground Ground 340 TRANSPONDER CHIP IN KEY Cor E FUSE BLOCK FUSE 1 FUSE 4 IGNITION SWITCH 10 AMP FUSE BLOCK FUSE 12 TO OTHER MODULES 806000 TRANSPONDER CHIP IN KEY PDC JUNCTION BLOCK 10 AMP JUNCTION BLOCK 80561092 TEST SK 9A TEST SK 9A CONTINUED FROM THE PREVIOUS PAGE TURN IGNITION ON CONTINUED REPAIRING VIN MISMATCH USING THE DRB SELECT ENGINE SYSTEM FROM THE MAIN MENU DISPLAY AND RECORD THE VEHICLE IDENTIFICATION NUMBER VIN DOES THE VIN RE
199. EPAIR FUSED IGNITON SWITCH OUTPUT FOR AN OPEN KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS MEASURE THE RESISTANCE BETWEEN THE TCC SOLENOID CONTROL CIRCUIT AND GROUND IS RESISTANCE BELOW 5 0 OHMS REPAIR THE TCC SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND MEASURE THE RESISTANCE OF THE TCC SOLENOID CONTROL CIRCUIT FROM THE POWERTRAIN CONTROL MODULE TO THE TCC SOLENOID HARNESS CONNECTORS FIG 2 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR TCC SOLENOID CONTROL CIRCUIT FOR AN OPEN SOLENOID HARNESS CONNECTOR KEY ON MEASURE THE VOLTAGE OF THE TCC SOLENOID CONTROL CIRCUIT AT PCM CONNECTOR FIG 2 IS THE VOLTAGE ABOVE 10 0 VOLTS REPLACE TCC SOLENOID REPLACE THE POWERTRAIN CONTROL MODULE MOOO mr oUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary XJ BODY 0 MOOO 22 XJ BODY TEST TC 14A REPAIRING RADIATOR FAN RELAY CIRCUIT Perform TEST DTC Before Proceeding WT FUSE MINIFUSE LG RD Fused Ign Fused Sw Output In PDC IGNITION SWITCH START RUN RADIATOR FAN RELAY POWERTRAIN CONTROL MODULE RADIATOR FAN D
200. EPAIRING NO ASD RELAY OUTPUT VOLTAGE AT Perform TEST DTC Before Proceeding TJ BODY IGNITION TO SWITCH BATTERY TO FUEL 4 TO PCM PUMP RELAY DB RD WT POWERTRAIN CONTROL 86 30 MODULE ASD RELAY DB YL ASD RELAY CONTROL 85 87 TO IGN COIL INJECTORS DG PK O2 SENSORS ASD RELAY OUTPUT AND GENERATOR MOOO III CC 80061040 XJ BODY To IGNITION TO SWITCH BATTERY POWERTRAIN CONTROL 30 MODULE ASD RELAY DB YL ASD RELAY To CONTROL 85 RD 87 GNCOIL INJECTORS DG OR gt O2SENSORS ASD RELAY OUTPUT AND GENERATOR C12 80b04fe0 Name of code Auto Shutdown Relay Control Circuit When monitored With ignition key on and battery voltage greater than 10 4 volts Theory of operation The Automatic Shutdown Relay ASD controls the 12 volt source to the fuel injectors ignition coil s and the oxygen heaters sensor The relay is located in the Power Distribution Center PDC One side of the relay control coil is supplied with battery voltage when the ignition switch is in the start or run position The circuit is completed when the other side of the relay coil is grounded by the Powertrain Control Module PCM The PCM grounds the control circuit when the ignition switch is in the start or run position and engine RPM is detected If engine RPM is not detected the PCM will remove the ASD relay control circuit ground Possible causes gt Relay coil
201. EPAIRING THROTTLE POSITION SENSOR VOLTAGE LOW Perform TEST DTC Before Proceeding TJ XJ BODY POWERTRAIN GROUND CONTROL THROTTLE SENSORS POSITION SENSOR BR YL SENSOR GROUND 12 12 GROUND MOOO mr uUuco OR DV SUPPLY TO OTHER SENSORS 80609637 of code Throttle Position Sensor Voltage Low When monitored With the ignition on and battery voltage above 10 4 volts Set condition TP sensor voltage at PCM 1 volt for 3 2 seconds Theory of operation The throttle position sensor contains a potentiometer that is operated by the throttle blade shaft As the throttle plate rotates the TP sensor provides a variable 0 to 5 volt signal to PCM The voltage is directly proportional to throttle angle When the throttle plate is at rest the voltage is low When the throttle is fully open the voltage is high With this signal the PCM can determine precise throttle position under all operating conditions The TP sensor receives a 5 volt supply from PCM The sensor ground is provided by PCM Possible causes gt Sensor signal circuit shorted to ground gt Throttle position sensor failure gt Loss of 5 volt supply 80aa4b9b TEST 26 5 5 26 REPAIRING THROTTLE POSITION SENSOR VOLTAGE LOW Perform TEST DTC Before Proceeding KEY ON USING THE DBR READ THE THROTTLE POSITION TP SENSOR VOLTAGE IS THE TP SNESOR VOLTAGE BELOW 0 2
202. EPARING NO CRANK CONDITION Perform TEST NS 9A Before Proceeding 5 5 9 15 CONTINUED FROM EQUIPPED WITH AN THE PREVIOUS gt MANUAL PAGE TRANSMISSION zu 5 MEASURE THE P N RELAY CONNECTOR IS THE RESISTANCE REPLACE THE POSITION SWITCH 39 BELOW 5 0 OHMS gt STARTER SENSE CIRCUIT FIG 1 OR 2 REPAIR THE OPEN PARK NEUTRAL SWITCH gt SENSE CIRCUIT BETWEEN STARTER RELAY AND SPLICE Perform Verification TEST VER 1A Check connectors Clean repair as necessary 487 gt 10 OZ 0 zOo o m um TEST VER 1A START VERIFICATION Important Note If the Powertrain Control Module has been changed and the correct VIN and mileage have not been programmed a DTC will be set in the ABS Airbag and SKIM modules In addition if the vehicle is equipped with a Sentry Key Immobilizer Module SKIM Secret Key data must be updated to enable starting Refer to GENERAL INFORMATION section 8 0 for programming the Powertrain Control Module and the SKIM For ABS and Airbag Systems ACTION 1 Enter correct VIN and Mileage in PCM 2 Erase codes in ABS and Airbag modules Inspect the vehicle to ensure that all engine components are connected Reassemble and reconnect components
203. ESISTANCE BELOW 5 0 OHMS REPAIR THE SHORT TO GROUND IN THE P N POSITION SWITCH SENSE CIRCUIT REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 381 TEST 20 CONTINUED CHECKING THE PARK NEUTRAL POSITION SWITCH XJ BODY 4 0L AUTO TRANS POWERTRAIN CONTROL MODULE BLACK CONNECTOR 0 400 4 MOOO mr ocozm oz TRANSMISSION RANGE SENSOR CONNECTOR PARK NEUTRAL POSITION SWITCH SENSE GROUND 80ab3 3a 5 20 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE TRANSMISSION RANGE SENSOR HARNESS CONNECTOR KEY ON USING A VOLTMETER MEASURE THE THE P N POSITION SWITCH SENSE CIRCUIT FIG 1 EST NTC 20A CONTINUED CHECKING THE PARK NEUTRAL POSITION SWITCH gt 15 ABOVE 10 0 VOLTS gt REPAIR THE OPEN IN THE P N POSITION SWITCH SENSE CIRCUIT USING THE DRB ACTUATE THE ASD RELAY gt USING A TEST LIGHT CONNECTED TO GROUND PROBE THE P N POSITION SW SENSE FIG 1 gt DOES THE TEST LIGHT ILLUMINATE BRIGHTLY THE TEST LIGHT ILLUMINATE VERY DIM THIS SHOULD BE CONSIDERED NORMAL OPERATION STOP ACTUATION USING THE DRB MONITO
204. ESS SIDE FUNCTION ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR SIGNAL p 80b6fOdb TJ XJ 2 5L IDLE AIR CONTROL MOTOR Wi THROTTLE IAT Og SENSOR 529 M E Le THROTTLE BODY MOUNTING BOLTS 4 At NI 2 THROTTLE Be Vg POSITION H Ce ZC N CONTROL PASSAGE M P INLET M SENSOR 80487223 TJ XJ BODY THROTTLE POSITION SENSOR CONNECTOR d 1 BR YL 2 3 FUNCTION SENSOR GROUND TP SENSOR SIGNAL 5 VOLT SUPPLY OR DB OR 80b810o7 18 XJ BODY 1 2 DOWNSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE 1 2 3 4 CAV COLOR FUNCTION 1 OR DG ASD RELAY OUTPUT 2 BK GROUND HEATER 3 BR YL SENSOR GROUND 4 TN WT OXYGEN SENSOR SIGNAL BOb6f dc TJ XJ 4 0L IDLE AIR CONTROL PASSAGE INLET IDLE AIR CONTROL MOTOR MOUNTING BOLTS 4 INTAKE MANIFOLD MAP AIR TEMPERATURE SENSOR a SENSOR 80524e3c TJ XJ BODY VEHICLE SPEED SENSOR HARNESS FUNCTION 5 VOLT SUPPLY SENSOR GROUND VEHICLE SPEED SENSOR SIGNAL 8060963 4 5 Fuel System TJ BODY FUEL PUMP CONNECTOR FUNCTION FUEL PUMP RELAY OUTPUT FUEL LEVEL SENSOR SIGNAL II SENSOR GROUND GROUND 80b089c8 TJ BODY FUEL SUPPLY RETAINER _ FUEL FILTER TUBE FRONT CLAMP FUEL PRESSURE gt _REGULATOR ve
205. EST NTC 1A Before Proceeding START TEST NTC 4A CONNECT A VACUUM GAUGE TO THE ENGINE ALLOW THE ENGINE TO IDLE NOTE THE NORMAL VACUUM READING WILL VARY ACCORDING TO THE ALTITUDE FIG 1 OBSERVE THE VACUUM GAUGE READING AT IDLE FIG 1 Perform Verification TEST VER 2A gt IS THE VACUUM GAUGE READING BETWEEN 13 AND 22 STEADY 5 NTC 13A Check connectors Clean repair as necessary 349 ENGINE VACUUM NORMAL TEST PASSED 0 MOOO mr ocozm oz 0 400 4 MOOO 254 oz TEST 5 CHECKING THE FUEL DELIVERY Perform TEST NTC 1A Before Proceeding FUEL FILTER REGULATOR SUPPLY ELECTRICAL CONNECTOR FUEL MODULE 1190305 TEST 5 CHECKING THE FUEL DELIVERY Perform TEST NTC 1A Before Proceeding WARNING THE FUEL START TEST SYSTEM MUST BE NTC 5A OPENED AND MAY BE UNDER HIGH PRESSURE RELIEVE FUEL PRESSURE CONNECT A FUEL PRESSURE GAUGE TO FUEL SYSTEM SEE GENERAL INFO 9 0 IS THE FUEL FUEL PRESSURE WITH THE DRB PRESSURE IS NORMAL IGNITION KEY ON ACTUATE THE FUEL gt 339kPa 34 kPa SYSTEM TEST 49 2 5 PSI TEST PASSED PERFORM SERVICE RECORD THE FUEL IS THE FUEL MANUAL FUEL SYSTEM PRESSURE READING
206. EST PASSED 0 400 4 MOOO mr ocozm oz TEST CHECKING THE MAP SENSOR Perform TEST NTC 1A Before Proceeding TJ XJ BODY POWERTRAIN TO MANIFOLD GROUND CONTROL VACUUM TO OTHER MODULE SENSORS 0 400 4 MOOO mr ocozm4 oz BR YL Sensor Ground 1 DG RD Map Sensor Signal 457 5V Supply MAP SENSOR TO TP SENSOR amp 0a4d2e2 EST CHECKING THE MAP SENSOR Perform TEST NTC 1A Before Proceeding START TEST NTC 8A KEY OFF MANIFOLD VACUUM SOURCE gt 5 ALLOW THE ENGINE TO IDLE gt WILL NOT IDLE MAINTAIN A CONSTANT RPM ABOVE IDLE USING THE DRB READ THE MAP SENSOR VACUUM gt 15 WITHIN 1 OF THE TEED IN VACUUM GAUGE MAP SENSOR OPERATING NORMALLY TEST PASSED NOTE INSPECT VACUUM SUPPLY FOR CORRECT OPERATION BEFORE REPLACE SENSOR REPLACE THE MAP SENSOR 0 MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 357 TEST 10 CHECKING THE OXYGEN SENSOR SWITCHING Perform TEST NTC 1A Before Proceeding BODY POWERTRAIN CONTROL MODULE Downst
207. ETE 0 MOOO 22 TEST 26 CONTINUED REPAIRING THROTTLE POSITION SENSOR VOLTAGE LOW TJ XJ BODY THROTTLE POSITION SENSOR CONNECTOR 0 MOOO CC 3 1 BR YL SENSOR GROUND 2 OR DB TP SENSOR SIGNAL 3 OR 5 SUPPLY 8065067 EST 26 CONTINUED REPAIRING THROTTLE POSITION SENSOR VOLTAGE LOW TEST 26 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE THROTTLE POSITION TP SENSOR HARNESS CONNECTOR KEY ON USE A VOLTMETER IN THE FOLLOWING STEP gt 5 SENSOR 5 VOLT SUPPLY CIRCUIT FIGs ad 15 BELOW 4 0 VOLTS REPAIR THE TP SENSOR 5 VOLT SUPPLY CIRCUIT FOR AN OPEN USING THE DRB READ THE TP SENSOR VOLTAGE gt IS THE VOLTAGE ABOVE 4 0 VOLTS REPLACE THE THROTTLE POSITION SENSOR KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS gt USING AN OHMMETER MEASURE BETWEEN THE TP SENSOR SIGNAL CIRCUIT AND GROUND FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE THROTTLE POSITION SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND USING AN OHMMETER MEASURE THE RESISTANCE gt BETWEEN THE SENSOR SIG
208. EY CONNECTOR 2 CONTROL MODULE GREY CONNECTOR FUNCTION SCI TRANSMIT CCD BUS SCI RECEIVE CCD BUS SCI TRANSMIT CCD BUS RECEIVE CCD BUS DATA LINK 4 DATA LINK CONNECTOR D CONNECTOR COLOR FUNCTION YL CAV COLOR FUNCTION VT BR CCD BUS CCD BUS BK LB GROUND 5 j GROUND BK TN GROUND fr d POWER GROUND LG SCI RECEIVE lige SCI RECEIVE SCI TRANSMIT 4 SCI TRANSMIT WT BK CCD BUS CCD BUS PK WT FUSED B FUSED B 80aaf 28 462 TEST NS 6B REPAIRING REPONSE CONDITION Perform TEST NS 6A Before Proceeding CC WAS THE IGNITION START TEST ON WHEN THE NO TURN IGNITION ON NS 6B RESPONSE MESSAGE GET A RESPONSE WAS DISPLAYED 0 TEST COMPLETE DISCONNECT DRB DISCONNECT THE PCM FROM THE DATA LINK ra 55 CONNECTOR DLC CONNECTORS MEASURE THE REPAIR THE SCI USE AN OHMMETER IN RESISTANCE BETWEEN IS THE RESISTANCE TRANSMIT CIRCUIT THE FOLLOWING m THE SCI TRANSMIT m BELOW 5 0 OHMS FOR A SHORT STEPS CIRCUIT AND GROUND GROUND FIG 1 OR 2 MEASURE THE REPAIR THE SCI RESISTANCE BETWEEN IS THE RESISTANCE RECEIVE CIRCUIT THE SCI RECEIVE BELOW 5 0 OHMS FOR A SHORT CIRCUIT AND GROUND GROUND FIG 1 OR 2
209. FOLLOWING STEP CONTINUED REPAIRING FUEL LEVEL SENDING UNIT SENDING UNIT NO CHANGE OVER TIME CONNECT A JUMPER WIRE BETWEEN THE FUEL LEVEL SENSOR SIGNAL CIRCUIT AND A KNOWN GOOD GROUND FIG 10R2 IS THE FUEL SENDING UNIT VOLTAGE BELOW 1 0 VOLT REPLACE THE FUEL PUMP MODULE DISCONNECT THE PCM HARNESS CONNECTOR USE AN OHMMETER IN THE FOLLOWING STEP MEASURE FUEL LEVEL SENSOR SIGNAL CKT gt BETWEEN THE PCM AND FUEL LEVEL SENDING UNIT FIG 3 OR 4 IS THE RESISTANCE BELOW 5 0 OHMS REPLACE THE POWERTRAIN CONTROL MODULE REPAIR THE FUEL LEVEL SENSOR CIRCUIT FOR HIGH RESISTANCE MOOO mr uUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 257 TEST TC 153A REPAIRING BATTERY TEMP SENSOR VOLTAGE LOW TOO HIGH Perform TEST DTC Before Proceeding Name of code Battery Temp Sensor Voltage Either Too High or Too Low When monitored With the ignition key on Set condition The PCM senses the voltage from the BTS to be either below 0 5 volts or above 4 9 volts for 3 seconds Theory of operation The battery temp sensor voltage is used by the PCM to determine what the charging system goal should be The PCM uses that goal to determine the charging output level The battery temp sensor is external to the PCM
210. FUSE B MOOO mr BK LG GROUND 80b6f00e XJ BODY INSTRUMENT CLUSTER TO PCM AND OTHER MODULES GROUND BK LG GROUND 80561008 5 5 225 EST TC 225A REPAIRING NO CDD BUS MESSAGE FROM THE MIC Perform TEST DTC Before Proceeding KEY ON USING THE DRB ERASE CODES CYCLE THE KEY AND OFF SEVERAL TIMES KEY ON USING THE DRB READ CODES DID THE NO CCD PCI BUS MESSAGE FROM MIC RETURN 5 225 THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS FIG 1 OR 2 WERE PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFORMATION 3 3 2 gt FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 2A 285 TEST COMPLETE Check connectors Clean repair as necessary MOOO mr oUco TEST 225 CONTINUED REPAIRING NO CCD BUS MESSAGE FROM TJ BODY INSTRUMENT CLUSTER HARNESS CONNECTOR C1 1 WT BK CCD BUS 2 VI BR CCD BUS 0 MOOO mr uUuco POWERTRAIN CONTROL MODULE HARNESS CONNECTOR C28 WT BK CCD BUS
211. G THE DRB DOES THE DRB CONTINUE TEST WAIT 10 SECONDS READ CODES gt DISPLAY THIS CODE gt SK 2A ON THE TURN IGNITION ON NEXT PAGE 5 USING THE CONDITION REQUIRED SCHEMATIC AS A WERE ANY PROBLEMS REPAIR AS SET THE CODE IS gt GUIDE INSPECT THE FOUND NECESSARY NOT PRESENT WIRING AND FIG 1 CONNECTORS REFER GENERAL INFORMATION 3 3 2 FOR ADDITIONAL TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 1A Check connectors Clean repair as necessary 311 lt MA lt 120 lt mN r uozzz lt MA zmo lt HPN sc E e D I OH S 2 TEST 5 2 CONTINUED REPAIRING PCM STATUS FAILURE TJ BODY XJ BODY SENTRY KEY IMMOBILIZER MODULE SENTRY KEY IMMOBILIZER MODULE ANTENNA FUSED FUSED IGN SWITCH OUTPUT RUN START CCD BUS VT BR CCD BUS GROUND ANTENNA Fused Ign Switch Output Run Start Ground Ground 312 TRANSPONDER CHIP IN KEY Cor E FUSE UE 1 FUSE 4 IGNITION SWITCH 10 AMP FUSE BLOCK FUSE 12 TO OTHER MODULES 806000 TRANSPONDER CHIP IN KEY PDC JUNCTION BLOCK 10 AMP JUNCTION BLOCK 80561092 TEST 5 2 5 5 2
212. GE 0 MOOO 22 Perform Verification TEST VER 2A Check connectors Clean repair as necessary TEST 25 CONTINUED REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS TJ XJ BODY IDLE AIR CONTROL MOTOR CONNECTOR MOOO mr uUuco VT BK AIR CONTROL 1 DRIVER IDLE AIR CONTROL 2 DRIVER YL BK IDLE AIR CONTROL 3 DRIVER GY RD IDLE AIR CONTROL 4 DRIVER amp 0b898b2 POWERTRAIN CONTROL MODULE VB A20 IAC MOTOR DRIVER 4 BR WT IAC MOTOR DRIVER 3 E YL BK 8 IAC MOTOR DRIVER 2 GY RD 19 IAC MOTOR DRIVER 1 IDLE AIR CONTROL MOTOR 80b6f0d8 Perform Verification TEST VER 2A TEST 25 CONTINUED FROM THE PREVIOUS PAGE START ENGINE AND LET IDLE USING A VOLTMETER MEASURE THE IAC DRIVER 1 CIRCUIT EST TC 25A CONTINUED REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS WAS THE VOLTAGE OVER 5 0 VOLTS AT ANY TIME PERFORM TEST 25 USING VOLTMETER MEASURE THE IAC DRIVER 2 CIRCUIT WAS THE VOLTAGE OVER 5 0 VOLTS AT ANY TIME PERFORM TEST 25 USING VOLTMETER MEASURE THE IAC DRIVER 3 CIRCUIT WAS THE VOLTAGE OVER 5 0 VOLTS AT ANY TIME gt PERFORM TEST TC 25D USING A VOLTMETER MEASURE THE IAC DRIVER 4 CIRCUIT WAS THE VOLTAGE
213. GE ABOVE 4 0 VOLTS SENSOR KEY OFF DISCONNECT THE PCM HANRESS CONNECTORS USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE RESISTANCE BETWEEN THE SENSOR SIGNAL AND SENSOR GND FIG 1 OR 2 gt IS THE RESISTANCE BELOW 5 0 OHMS I REPAIR THE SENSOR SIGNAL CIRCUIT FOR A SHORT TO SENSOR THE GROUND CIRCUIT USING AN OHMMETER MEASURE THE RESISTANCE OF IAT SENSOR SIGNAL CIRCUIT TO GROUND FIG 1 2 I 3 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO CC Perform Verification TEST VER 2A Check connectors Clean repair as necessary 169 TEST 58 REPAIRING INTAKE AIR TEMP SENSOR VOLTAGE HIGH Perform TEST DTC Before Proceeding Name of code Intake Air Temp Sensor Voltage High When monitored With the ignition on and battery voltage greater than 10 4 volts Set condition The intake air sensor circuit voltage at the PCM goes above 4 9 volts Theory of operation The intake air temperature sensor IAT is located in the intake manifold where it measures the temperature of the air that is about
214. H 1 WC 1 lt 5 LiL 1 i ANIA 3 10 M XAW MV3919 I 1 H 95 WANDA lt 03385 03895 20 YOLIN HOLIMS 3XM9 1555 98 HOLO3fNI HOLIMS Sg 5 90109VMI me Ne lav 278 TWYOIS UOSN3G 20 27 HOLOSINI ES 009098 40 V Es T Sig 90109VMI 908035 901 9I919 0 vid 100 90 HOSNAS EI 05M18 Lenin SLIOA 4 5 NOILISOd dio se IJVHSWVO Dee 708 35 35909 DAC AING 069 JINON JOHlNOO 1 80435 4 NIVHLHAMOd UsadS 4 IOIHJA U 9341 AEVONOO3S 911089 5 HOSN3S RA aco Trd 823 090 ewt 09M98 ER GEN Sal V VI zd TES INSNVEL 125 9 0 3M3999 108 e 860 wa 1 NAL Sy M 93 e HOSNAS diN31 4 _ HOSN3S 14431 19034 320 NOISSIASNY HL er 8 5 5 38155384 10 90 M3 AHILE 0 og 818 gt 2220 0096 8 5 HOSN3S 1909 7 555 5 6 T T HOSNSS 58399 10 gt 715 8 1 10 3 DI HOLIMS HOLIAS 959 85388 ov ISNI HOLIMS 497 20012 110 20 4 5
215. H 80b0983e Name of code A C Clutch Relay Circuit When monitored With the ignition key in the run position and battery voltage above 10 4 volts Set condition An open or shorted condition is detected in the A C clutch relay control circuit Theory of operation The A C compressor clutch relay controls the 12 volt source for the A C clutch The relay is located in the power distribution center One side of the relay control coil is supplied with 12 volts when the ignition Switch is turned to the run position The circuit is completed when the other side of the relay coil is grounded by the powertrain control module PCM When A C is requested the PCM adjusts the idle speed to accommodate the A C compressor load on the engine The PCM grounds the relay control circuit after the PCM receives an A C request and adjustment of the idle speed has been implemented Possible causes Relay coil open or shorted Fused ignition switch output circuit open Compressor clutch relay control circuit open or shorted gt Inoperative circuit driver in powertrain control module FIG 1 80aa4c18 16 5 5 16 REPAIRING A C CLUTCH RELAY CIRCUIT Perform TEST DTC Before Proceeding KEY ON USING THE DRB ACTUATE THE A C CLUTCH RELAY IS THE A C CLUTCH gt RELAY CLICKING 5 16
216. HE RELAY CONNECTOR TO GROUND FIG 1 OR 2 IS THE RESISTANCE BELOW 5 0 OHMS REPLACE THE POWERTRAIN CONTROL MODULE REPAIR THE ASD RELAY OUTPUT CIRCUIT FOR A SHORT TO GROUND 0 MOOO 0 0 70 Perform Verification TEST VER 2A Check connectors Clean repair as necessary 163 0 MOOO CC TEST 49 REPAIRING PCM FAILURE EEPROM WRITE DENIED Perform TEST DTC Before Proceeding TEST 49 REPAIRING PCM FAILURE EEPROM WRITE DENIED Perform TEST DTC Before Proceeding START TEST 49 USING THE DRB PERFORM THE SRI MEMORY TEST DOES THE DRB DISPLAY WRITE REFUSED TEST COMPLETE USING THE DRB PERFORM THE SRI MEMORY TEST A SECOND TIME Perform Verification TEST VER 2A DOES THE DRB DISPLAY WRITE gt REFUSED AGAIN REPLACE THE POWERTRAIN CONTROL MODULE TEST COMPLETE Check connectors Clean repair as necessary 165 0 MOOO CC TEST 57 REPAIRING INTAKE AIR TEMP SENSOR VOLTAGE LOW Perform TEST DTC Before Proceeding Name of code Intake Air Temp Sensor Voltage Law When monitored With the ignition on and battery voltage greater than 10 4 volts Set condition The intake air sensor circuit voltage at the
217. HE LINE gt AND REPLACE THE PURGE SOLENOID Perform Verification TEST VER 2A Check connectors Clean repair as necessary 375 0 400 4 MOOO mr ocozm oz 0 400 4 MOOO mr ocozm4 oz TEST 17 CHECKING THE EVAPORATIVE EMISSION SYSTEM Perform TEST NTC 17A Before Proceeding 80b27d34 TEST 17 CHECKING THE EVAPORATIVE EMISSION SYSTEM Perform TEST NTC 17A Before Proceeding START TEST 17 DISCONNECT THE VACUUM LINE AT THE CANISTER THAT GOES TO THE EVAP SOLENOID ATTEMPT TO BLOW AIR THROUGH THE VACUUM LINE THAT GOES TO THE CANISTER Perform Verification TEST VER 2A Check connectors Clean repair as necessary 377 gt DOES THE VACUUM LINE ALLOW AIR TO PASS REPLACE THE EVAPORATIVE CANISTER REPAIR OR REPLACE THE VACUUM LINE Qo ao om MOOO mr ocozm oz MOOO 2 oz TEST 19 CHECKING THE INTAKE AIR TEMPERATURE SENSOR Perform TEST NTC 1A Before Proceeding TJ BODY IDLE AIR CONTROL PASSAGE INLET MOUNTING BOLTS SENSOR XJ BODY IDLE AIR CONTROL MOTOR SENSOR THROTTLE BODY MOUNTING e BOLTS 4 LEM 7 7 N hs aes OS D IDLE AIR CONTROL PASSAGE INLET IAT lt IDLE AIR CONTROL MOTOR
218. HE RESISTANCE BELOW 5 0 OHMS REPAIR THE SENSOR SIGNAL CIRCUIT FOR AN RESISTANCE OF THE CKP SENSOR SIGNAL CIRCUIT SENSOR CONNECTOR AND THE SENSOR GROUND FIG 1 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE SENSOR GROUND MEASURE THE RESISTANCE OF THE CKP SENSOR SIGNAL CIRCUIT BETWEEN THE CKP SENSOR CONNECTOR AND GROUND FIG 1 3 IS THE RESISTANCE BELOW 5 0 OHMS gt gt CML SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND MEASURE THE RESISTANCE BETWEEN THE CKP SENSOR SIGNAL CIRCUIT AND THE 5 VOLT SUPPLY CIRCUIT AT THE CKP SENSOR CONNECTOR BIG 2 gt IS THE RESISTANCE BELOW 5 0 OHMS YES REPAIR THE SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE 5 VOLT SUPPLY CIRCUIT Perform Verification TEST VER 2A Check connectors Clean repair as necessary 153 2 REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO CC TEST 40 REPAIRING NO CRANK REFERENCE SIGNAL AT Perform TEST TC 40A Before Proceeding DIXJ BODY CRANKSHAFT POWERTRAIN TO TP SENSOR AND POSITION CONTRO
219. HE m BELOW 5 0 OHMS 69 gt CIRCUIT FOR AN CIRCUIT INJECTOR FIG 2 CONNECTOR REPLACE THE gt POWERTRAIN CONTROL MODULE Perform Verification TEST VER 2A Check connectors Clean repair as necessary 185 MOOO mr oUuco MOOO mr oUucom TEST TC 82A CIRCUIT Perform TEST DTC Before Proceeding Name of code Speed Control Power Relay Circuit When monitored With the ignition key on speed control switched on Set condition The speed control power supply circuit is either open or shorted to ground Theory of operation The PCM monitors the voltage drop across all speed control solenoids and the power supply circuit Possible causes Open and shorted power supply circuit Failed dump solenoid S C servo 80 0165 TJ BODY BRAKE LAMP SWITCH CONNECTOR BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT FUSED B BRAKE LAMP SWITCH OUTPUT 80b099e1 FIG 2 TJ BODY CONTROL MODULE GREY CONNECTOR FUNCTION 5 VAC SOL CONTROL S C VENT SOL CONTROL 12 VOLT SUPPLY BRAKE SW SENSE BRAKE LAMP SWITCH CONNECTOR BRAKE SW SENSE GROUND 12 VOLT SUPPLY S C BRAKE SW OUTPUT FUSED STOP LAMP SW OUTPUT 806661 186 REPAIRING SPEED CONTROL POWER RELAY SPEED CONTROL 12V DRIVER TJ XJ BODY SPEED CONTROL SERVO CONNECTOR COLOR FUNCTION
220. HERE WIGGLING INTERRUPTED THE VOLTAGE CYCLE Perform Verification TEST VER 3A Check connectors Clean repair as necessary 425 CONTINUE TEST gt CH 1A ON THE NEXT PAGE 09 40 4 OZz O2z ro TEST CH 1A CONTINUED CHARGING SYSTEM NO CODE TEST TJ XJ BODY BK GY FUSED POWERTRAIN BATTERY CONTROL MODULE DG OR cos GEN FIELD SOURCE GENERATOR OAYOMA 02 0205 210 DG B10 GEN FIELD DRIVER FUNCTION 1 DG OR GENERATOR SOURCE 2 GENERATOR FIELD BK GY B 80b6b36c 1 5 1 CONTINUED FROM THE PREVIOUS PAGE CONTINUED CHARGING SYSTEM NO CODE TEST USE A VOLTMETER IN THE FOLLOWING STEP MEASURE BETWEEN THE GENERATOR 12V Bt TERMINAL AND THE BATTERY SIDE FIG 1 CAUTION ENSURE ALL WIRES ARE CLEAR OF THE ENGINE S MOVING PARTS START THE ENGINE gt IS THE VOLTAGE ABOVE 0 4 VOLT REPAIR THE CIRCUIT FOR HIGH RESISTANCE BETWEEN THE GENERATOR AND THE BATTERY KEY OFF USE A VOLTMETER IN THE FOLLOWING STEP MEASURE BETWEEN THE GENERATOR CASE AND BATTERY SIDE CAUTION ENSURE ALL WIRES ARE CLEAR OF THE ENGINE S MOVING PARTS START THE ENGINE
221. HICLE USING THE DRB ATTEMPT TO READ TROUBLE CODES DID THE DRB DISPLAY NO RESPONSE REPLACE THE INITIAL 5 POWERTRAIN CONTROL MODULE SUBSTITUTE ANOTHER DRB ADAPTER CABLE USING THE DRB ATTEMPT TO READ TROUBLE CODES DID THE DRB DISPLAY NO RESPONSE REPLACE THE DRB ADAPTER CABLE HAVE THE DRB REPAIRED OR REPLACED OAYOMaA gt 10 OZ Perform Verification TEST VER 1A Check connectors Clean repair as necessary 465 TEST 6 REPAIRING NO RESPONSE CONDITION Perform TEST NS 6A Before Proceeding TJ BODY POWER DISTRIBUTION CENTER FUEL PUMP RELAY 0 40 4 3 40 OZ FUNCTION FUSED IGNITION SWITCH OUTPUT FUEL PUMP RELAY CONTROL XJ BODY POWER DISTRIBUTION CENTER PDC RELAY SECTION FUEL PUMP RELAY 80b6f0e0 6 5 5 NS 6C DISCONNECT THE FUEL PUMP ELECTRICAL CONNECTOR USING MEASURE THE FUEL PUMP RELAY OUTPUT CKT AT THE RELAY CONN FIG 1 OR 2 REPAIRING NO RESPONSE CONDITION Perform TEST NS 6A Before Proceeding Perform Verification TEST VER 1A gt IS THE RESISTANCE BELOW 5 0 OHMS
222. IDLE AIR CONTROL MOTOR DRIVER CIRCUIT Perform Verification TEST VER 2A Check connectors Clean repair as necessary 105 0 MOOO mr oUco TEST 25 REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS Perform TEST TC 25A Before Proceeding TJ XJ BODY IDLE AIR CONTROL MOTOR CONNECTOR 0 MOOO CC VT BK AIR CONTROL 1 DRIVER IDLE AIR CONTROL 2 DRIVER YL BK IDLE AIR CONTROL 3 DRIVER GY RD IDLE AIR CONTROL 4 DRIVER amp 0b898b2 POWERTRAIN CONTROL MODULE VB A20 IAC MOTOR DRIVER 4 BR WT IAC MOTOR DRIVER 3 E YL BK 8 IAC MOTOR DRIVER 2 GY RD 19 IAC MOTOR DRIVER 1 IDLE AIR CONTROL MOTOR 80b6f0d8 TEST 25 REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS Perform TEST TC 25A Before Proceeding KEY OFF DISCONNECT START TEST THE POWERTRAIN IS ANY TERMINAL REPAIR AS TC 25E CONTROL MODULE m DAMAGED PUSHED NECESSARY X HARNESS CONNECTOR OUT OR MISWIRED MEASURE RESISTANCE OF THE IAC 4 IS THE RESISTANCE REPLACE THE DRIVER CIRCUIT gt BELOW 5 0 OHMS gt POWERTRAIN CONTROL BETWEEN PCM amp IAC MODULE 1 REPAIR THE OPEN IDLE AIR CONTROL MOTOR DRIVER CIRCUIT Perform Verification TEST VER 2A Check connectors Clean repair as necessary 107 0 MOOO mr oUco TEST 26 R
223. INUED CHECKING THE OXYGEN SENSOR SWITCHING WITH THE DRB IN MISCELLANEOUS RESET THE ADAPTIVE FUEL MEMORY START ENGINE AND LET IDLE FOR AT LEAST THREE MINUTES NOTE ENGINE MUST BE RUNNING AND AT NORMAL OPERATING TEMPERATURE 1 2 2 SENSOR SHOULD SWITCH SLOWER THAN THE 1 1 02 SENSOR USING THE DRB READ THE 2 SENSOR VOLTAGES gt ARE THE 02 SENSOR VOLTAGES SWITCHING NORMALLY TEST PASSED Perform Verification TEST VER 2A 363 PERFORM TEST NTC 13A Check connectors Clean repair as necessary 0 MOOO mr ocozm oz 0 MOOO CC TEST NTC 11A CHECKING THE OXYGEN SENSOR HEATER Perform TEST NTC 1A Before Proceeding TJ BODY POWERTRAIN CONTROL MODULE TN WT Downstream Oxygen Sensor Signal DOWNSTREAM DG PK OXYGEN SENSOR ASD Relay Output OR DG ASD Relay Output Sensor Ground BK TO IGNITION COILS GENERATOR AND INJECTORS Ground BK DG Upstream Oxygen Sensor Signal UPSTREAM OXYGEN SENSOR 806118 1 1 1 02 POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND UPSTREAM OXYGEN SENSOR SIGNAL ASD RELAY OUTPUT UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR 80676965 SIGNAL TJ 1 202 POWERTRAIN C
224. IR THE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE KEY OFF DISCONNECT THE POWERTRAIN CONTROL MODULE DISCONNECT THE VOLTMETER WITH AN OHMMETER MEASURE THE RESISTANCE OF THE 5 VOLT SUPPLY CIRCUIT TO GROUND AT THE POWERTRAIN CONTROL MODULE CONNECTOR IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SHORTED 5 VOLT SUPPLY PRIMARY OR SECONDARY SHORTED TO GROUND MEASURE THE RESISTANCE OF THE 5 VOLT SUPPLY CIRCUIT TO SENSOR GROUND CKT AT THE POWERTRAIN CONTROL MODULE gt IS THE RESISTANCE BELOW 5 0 OHMS gt REPAIR THE SHORTED 5 VOLT SUPPLY PRIMARY OR SECONDARY SHORTED TO SENSOR GND CKT Perform Verification TEST VER 1A Check connectors Clean repair as necessary 471 PERFORM TEST NS 6B 3 40 OZ TEST 5 7 CHECKING THE IDLE AIR CONTROL MOTOR Perform TEST NS SEL Before Proceeding TJ XJ BODY OAYOMaA 3 40 OZ IDLE AIR CONTROL MOTOR CONNECTOR IDLE AIR CONTROL 1 DRIVER IDLE AIR CONTROL 2 DRIVER IDLE AIR CONTROL 3 DRIVER IDLE AIR CONTROL 4 DRIVER 80b898b2 TEST 7 Perform TEST NS SEL Before Proceeding CHECKING THE IDLE AIR CONTROL MOTOR START TEST NS 7A 5 MOTOR DTC PERFORM TEST 25 HOLD THE ENGINE THROT
225. IRCUIT 186 TC 86A REPAIRING SPEED CONTROL SWITCH ALWAYS HIGH 194 TC 87A REPAIRING SPEED CONTROL SWITCH ALWAYS LOW 200 TC 101A REPAIRING FUEL PUMP SYSTEM RELAY CONTROL CIRGU gp P 202 TC 114A REPAIRING P N SWITCH STUCK IN PARK OR GEAR 206 TC 115A REPAIRING POWER STEERING SWITCH FAILURE 212 TC 118A REPAIRING FUEL SYSTEM RICH 1 1 RICH 218 TC 119A REPAIRING FUEL SYSTEM LEAN 1 1 LEAN 222 TABLE OF CONTENTS Continued TC 132A REPAIRING TPS VOLTAGE DOES NOT AGREE WITH 232 TC 148A REPAIRING TORQUE CONVERTER CLUTCH NO RPM DROP AT LOCK UP TJ XJ BODY WITH 3 SPD AUTO TRANS 238 TC 149A REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO LOW 244 TC 150A REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO HIGH 248 TC 151A REPAIRING FUEL LEVEL SENDING UNIT NO CHANGE OVER 254 TC 153A REPAIRING BATTERY TEMP SENSOR VOLTAGE TOO LOW TOO ipt c PF nn 258 TC 155A REPAIRING 1 1 O2 SENSOR SHORTED TO GROUND 264 TC 156A REPAIRING 1 2 O2 SENSOR SHORTED TO GROUND 268 TC 157A REPAIRING INTERMITTENT LOSS OF CMP OR CKP 272 TC 225A REPAIRING NO CDD BUS MESSAGE FROM THE MIC 284 TC 226A REPAIRING NO CCD BUS MESSAGE RECEIVED FROM SKIM 288 TC 232A REPAIRING INVALID OR WRONG KEY MESSAGE FROM SKIM 292 TC 23
226. IRCUIT FROM THE PCM CONNECTOR AND THE VSS CONNECTOR FIG 2 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN SPEED SENSOR SIGNAL CIRCUIT MEASURE THE RESISTANCE BETWEEN THE VSS SIGNAL CIRCUIT AND GROUND FIG 1 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND POWERTRAIN CONTROL MODULE MOOO mr oUco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 129 TEST 35 REPAIRING NO VEHICLE SPEED SENSOR SIGNAL Perform TEST TC 35A Before Proceeding TJ XJ BODY VEHICLE SPEED SENSOR HARNESS CONNECTOR 0 MOOO CC M 1 FUNCTION 1 VI OR 5 VOLT SUPPLY 2 BR YL SENSOR GROUND WT OR VEHICLE SPEED SENSOR SIGNAL 80 0463 0 TEST 35 REPAIRING NO VEHICLE SPEED SENSOR SIGNAL Perform TEST TC 35A Before Proceeding START TEST 35 CONNECT ONE END OF A JUMPER WIRE TO THE VSS SENSOR SIGNAL CIRCUIT d USING THE DRB READ THE VSS SIGNAL WHILE OBSERING THE DRB DISPLAY TAP THE OTHER END OF THE JUMPER TO A WELL KNOWN GROUND Perform Verification TEST VER 2A Check connectors Clean repair as necessary 131 DOES THE DRB DISP
227. IS THE VOLTAGE ABOVE 0 1 VOLT y REPAIR GENERATOR GROUND FOR HIGH RESISTANCE GENERATOR CASE TO BATTERY SIDE USING THE DRB READ BATTERY VOLTAGE AND RECORD USING A VOLTMETER MEASURE THE VOLTAGE ACROSS THE BATTERY TERMINALS RECORD SECOND VOLTAGE READING COMPARE THE TWO VOLTAGE READINGS Perform Verification TEST VER 3A IS VOLTAGE DIFFERENCE LESS THAN ONE VOLT gt TEST COMPLETE Check connectors Clean repair as necessary 427 CONTINUE TEST gt CH 1A ON THE NEXT PAGE OZ Oz iro 9 40 4 OZ O2z P Iro TEST CH 1A CONTINUED CHARGING SYSTEM NO CODE TEST TJ BODY POWERTRAIN CONTROL MODULE CONNECTORS 80b089df BODY POWERTRAIN CONTROL MODULE CONNECTORS A22 DG BK FUSED B10 DG GENERATOR FIELD DRIVER C12 DG OR AUTO SHUTDOWN RELAY 80b04fdf 1 5 1 CONTINUED FROM THE PREVIOUS PAGE KEY OFF CONTINUED CHARGING SYSTEM CODE TEST DISCONNECT THE PCM HARNESS CONNECTORS KEY ON USING A VOLTMETER MEASURE FUSED B AT PCM CONNECTOR FIG 1 OR 2 WITHIN ONE VOLT OF IS THE VOLTAGE THE RECORDED DRB READING La REPLACE THE POWERTRAIN CONTROL MODULE CIRCUI
228. If there are no trouble codes the repair was successful and is now complete 490 TEST VER 3A CHARGING VERIFICATION Important Note If the Powertrain Control Module has been changed and the correct VIN and mileage have not been programmed a DTC will be set in the ABS Airbag and SKIM modules In addition if the vehicle is equipped with a Sentry Key Immobilizer Module SKIM Secret Key data must be updated to enable starting Refer to GENERAL INFORMATION section 8 0 for programming the Powertrain Control Module and SKIM Inspect the vehicle to ensure that all engine components are connected Reassemble and reconnect components as necessary If the powertrain control module has been changed do the following 1 If the vehicle is equipped with a factory theft alarm start the vehicle at least 20 times so that the alarm system may be activated when desired Connect the DRB to the PCM data link connector and erase the codes Ensure no other charging system problems remain by doing the following 1 Start the engine Raise the engine speed to 2000 rpm for at least 30 seconds Allow the engine to idle 2 3 4 Turn the engine off 5 Turn the ignition key on 6 With the DRB read trouble code messages If the repaired code as reset or another one has set check all pertinent Technical Service Bulletins and return to DTC TEST if necessary If there are no codes the repair is now complete 491 0 zo
229. KEY IMMOBILIZER MODULE gie FUSE BLOCK FUSED B UA TO PDC 10 FUSE 4 FUSED IGN SWITCH qu uH TO OUTPUT RUN START IGNITION 10 AMP SWITCH WT BK CCD BUS TO OTHER CCD BUS MODULES BK GROUND BK LB 0 MOOO CC 80b6f0cc XJ BODY SENTRY KEY ANTENNA TRANSPONDER IMMOBILIZER CHIP MODULE IN KEY e DB GY PDC Fused B DAME gt 806 WT BK JUNCTION BLOCK Fused Ign Switch 10 AMP Output Run Start 67 0 gt JUNCTION WT BK BLOCK CCD BUS VBR OTHER BK LG Ground BK LG Ground 8066092 of code CCD Message From SKIM Module When Monitored With ignition on Set Condition The PCM does not receive a CCD Bus message from the SKIM module when expected Theory of operation At ignition on the SKIM module sends a message to the PCM verifying the correct ignition key If the PCM receives a correct message it will allow the engine to start and continue to run If the PCM does not receive a message or receives an incorrect key message the PCM will allow the engine to start and run for two seconds If the PCM does not receive a valid key message in six start attempts the PCM will disable the starter relay until a valid key message is received Possible causes gt Open or shorted CCD Bus circuit s Failed SKIM module Failed PCM Connector terminals Connector wires 80b11866 5
230. KEY ON USING THE DRB READ THE MAP SENSOR VOLTAGE IS THE VOLTAGE BELOW 1 0 VOLTS REPLACE THE MAP m SENSOR MOVE THE JUMPER WIRE FROM THE SENSOR GROUND CIRCUIT TO ENGINE GROUND FIGs 1 READ THE MAP SENSOR VOLTAGE IS THE MAP SENSOR VOLTAGE BELOW 1 0 VOLTS REPAIR THE MAP SENSOR GROUND gt Perform Verification TEST VER 2A Check connectors Clean repair as necessary 143 CONTINUE TEST gt TC 37A ON THE NEXT PAGE Qo 0m MOOO CC M TEST TC 37A CONTINUED REPAIRING MAP SENSOR VOLTAGE TOO HIGH TJ XJ BODY 0 MOOO CC MAP SENSOR CONNECTOR FUNCTION 3 OR 5 VOLT SUPPLY 2 DG RD SENSOR SIGNAL 1 SENSOR GROUND POWERTRAIN CONTROL MODULE BLACK CONNECTOR 4 GROUND 17 5 VOLT SUPPLY A27 DG RD SENSOR SIGNAL 154 TEST TC 37A CONTINUED REPAIRING MAP SENSOR VOLTAGE TOO HIGH TEST TC 37A CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS gt USE AN OHMMETER IN THE FOLLOWING STEP RESISTANCE OF THE MAP SENSOR SIGNAL CIRCUIT BETWEEN THE PCM AND THE MAP SENSOR FIG 1 L IS THE RESISTAN
231. L MAP SENSOR SENSOR MODULE GY BK 8 CKP Sensor Signal OR 5 Volt Suppl TN YL CMP Sensor Signal CAMSHAFT POSITION 4 SENSOR BR YL Sensor Ground 0 MOOO mr uUuco TO OTHER SENSORS 80a4eff4 TJ XJ BODY Name of code No Crank Reference Signal at PCM When monitored During engine cranking Set condition No signal from the crank position sensor is present during engine cranking and at least 3 cam position signals have occured Theory of operation crank position sensor is a hall effect type sensor used to detect the crankshaft speed and position The PCM supplies 5 volts and a ground to power up the sensor The PCM also supplies a 5 volt pull up voltage The sensor signal is created by the slots passing under the sensor When a slot is under the senscr the signal is high 5 0V when the metal between the slots is under the sensor the signal is low 03V Probable causes Open or shorted 5 volt supply circuit Open sensor ground Open or shorled signal circuit Excessive clearance between the sensor and flywheel or crankshaft Damaged flywheel Failed sensor Failed PCM Shorted VSS 5 volt supply circuit 80aa4bdf 154 TEST 40 5 5 40 REPAIRING CRANK REFERENCE SIGNAL PCM Perform TEST 40 Before Proceeding ATTEMPT TO START THE ENGINE IF NOT ALREADY RUNNING DOES THE ENGINE START gt PERF
232. L SYSTEM LEAN 1 1 LEAN Perform TEST DTC Before Proceeding NOTE VERY LOW FUEL LEVEL COULD CAUSE THIS TROUBLE CODE TO SET MAKE SURE TANK IS AT LEAST 1 4 FULL DID THE VEHICLE RUN OUT OF FUEL SHORTLY BEFORE COMING IN ERASE TROUBLE CODES TEST COMPLETE REFER TO FIGURE 1 FOR POSSIBLE TROUBLE CODE CAUSES WITH THE DRB READ ALL TROUBLE CODES ARE THERE ANY OTHER TROUBLE CODES OR 5 5 THAT APPLY PERFORM THE DTC TEST OR THE T S B S THAT APPLY PERFORM FUEL DELIVERY TEST NTC 3A DID TEST NTC 3A PASS REPAIR AS NECESSARY START THE ENGINE AND ALLOW IT TO REACH NORMAL OPERATING TEMPERATURE CHECK EXHAUST SYSTEM FOR LEAKS BETWEEN ENGINE AND THE O2 SENSORS ARE THERE ANY EXHAUST LEAKS gt REPAIR REPLACE EXHAUST COMPONENTS AS NECESSARY CYCLE KEY OFF THEN ON READ THE 1 1 02 SENSOR LONG TERM ADAPTIVE MEMORY VALUES ARE ANY OF THE LONG TERM ADAPTIVE MEMORY BETWEEN 20 AND 32 THE CONDITION REQUIRED TO SET THIS TROUBLE CODE IS NO LONGER PRESENT TEST COMPLETE Perform Verification TEST VER 2A Check connectors Clean repair as necessary 223 PERFORM TEST gt 119
233. LAY THE VSS 0 REPAIR THE SENSOR GROUND CIRCUIT FOR AN OPEN gt REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO mr oUco TEST 35 REPAIRING NO VEHICLE SPEED SENSOR SIGNAL Perform TEST TC 35A Before Proceeding TJ XJ BODY MOOO mr uUco VSS CIRCUIT CHECK COLOR 1 5 VOLT SUPPLY 2 SENSOR GROUND 3 WT OR VEHICLE SPEED SENSOR SIGNAL POWERTRAIN CONTROL MODULE CONNECTORS FUNCTION 4 B SENSOR GROUND B27 WT OR VEHICLE SPEED SENSOR SIGNAL R YL B31 VT OR SUPPLY 80b0d6de 35 5 5 TC 35C REPAIRING NO VEHICLE SPEED SENSOR SIGNAL Perform TEST TC 35A Before Proceeding KEY ON DISCONNECT THE PCM CONNECTORS I DISCONNECT THE VSS HARNESS CONNECTOR USE AN THE FOLLOWING STEP gt MEASURE THE RESISTANCE OF THE VSS SIGNAL CIRCUIT BETWEEN THE PCM AND 55 1 IS THE RESISTANCE BELOW 5 0 OHMS REPLACE THE POWERTRAIN CONTROL MODULE Perform Verification TEST VER 2A Check connectors Clean repair as necessary 133 gt REPAIR THE VSS SIGNAL CIRCUIT FOR AN OPEN 0 MOOO mr uUuco 5 36 Perform TEST DTC Before Proceeding TJ XJ BODY TO MANIFOLD VACUUM MOOO
234. LG arty eae SPEED CONTROL SW SIGNAL CANCE YL RD 12 VOLT SUPPLY WT PK BRAKE SWITCH SENSE SERVO TN RD S C VAC SOL CONTROL SOLENOIDS LG RD 5 BRAKE 4 BRAKE S C VENT SOL CONTROL SW OUTPUT SWITCH 306099 0 196 TEST TC 86A CONTINUED REPAIRING SPEED CONTROL SWITCH ALWAYS HIGH TEST 86 CONTINUED FROM THE PREVIOUS PAGE DISCONNECT THE CLOCK SPRING HARNESS CONNECTOR MEASURE RESISTANCE OF S C SWITCH SIGNAL CIRCUIT FROM PCM TO CLOCK SPRING CONN 1 Perform Verification TEST VER 4A gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN S C SWITCH SIGNAL CIRCUIT PCM TO CLOCK SPRING 197 REPAIR THE OPEN S C SWITCH SIGNAL CIRCUIT AT CLOCK SPRING Check connectors Clean repair as necessary 0 MOOO mr uUuco TEST 86 REPAIRING SPEED CONTROL SWITCH ALWAYS HIGH Perform TEST TC 86A Before Proceeding SPEED CONTROL POWERTRAIN 4 CONTROL L SEIT _JSIDE MODULE BR YL SENSOR GRCUND RD LG SPEED CONTROL SW SIGNAL RIGHT YL RD SIDE 12 VOLT SUPPLY WT PK BRAKE SWITCH SENSE FUSED SERVO BI TN AD S C VAC SOL CONTROL SOLENOIDS LG RD mE S C BRAKE 5 BRAKE VENT SOL CONTROL LAMP E TI SICA CV 100 0 MOOO mr oUco TO 80b089e0 Name of Code Speed Contro
235. LOW 5 0 OHMS REPAIR OPEN STARTER RELAY OUTPUT CKT REINSTALL STARTER RELAY CHECK THE BATTERY CABLES FOR HIGH RESISTANCE USE SERVICE MANUAL PROCECURE I 9 DID EITHER BATTERY CIRCUIT HAVE A VOLTAGE DROP GREATER THAT 0 2 VOLT REPAIR THE BATTERY CIRCUIT FOR HIGH RESISTANCE Perform Verification TEST VER 1A NO DID THE STARTER SOLENOID CLICK WHEN THE JUMPER WIRE WAS PREVIOUSLY CONNECTED REPLACE THE STARTER SOLENOID Check connectors Clean repair as necessary 485 REPAIR MECHANICAL CONDITION PREVENTING THE STARTER MOTOR FROM CRANKING 3 40 OZ TEST 9 CONTINUED REPARING CRANK CONDITION Perform TEST 5 9 Before Proceeding TJ BODY POWER DISTRIBUTION CENTER PDC RELAY SECTION STARTER RELAY 0 40 4 3 40 OZ FUNCTION FUSED B IGNITION SWITCH OUTPUT PARK NEUTRAL SWITCH SENSE AUTO TRANS GROUND MANUAL TRANS STARTER RELAY OUTPUT 8056107 XJ BODY POWER DISTRIBUTION CENTER PDC STARTER RELAY RELAY SECTION CONNECTOR FUSED B P N POSITION SWITCH SENSE AUTO TRANSMISSION GROUND MANUAL TRANSMISSION FUSED IGNITION SWITCH OUTPUT STARTER RELAY OUTPUT TEST 9 CONTINUED R
236. LURE Perform TEST SK 1A Before Proceeding TJ BODY XJ BODY ANTENNA TRANSPONDER SENTRY KEY CHIP IMMOBILIZER IN KEY MODULE gie FUSE BLOCK FUSED SI 10 FUSE 4 FUSED IGN SWITCH OUTPUT RUN START IGNITION 10 AMP SWITCH WT BK CCD BUS R TO OTHER CCD BUS MODULES BK GROUND BK LB GROUND 80b6f0cc SENTRY KEY ANTENNA TRANSPONDER IMMOBILIZER MODULE DB GY PDC FusedB ZA WT BK JUNCTION BLOCK Fused Ign Switch 10 AMP Output Run Start 6 JUNCTION WT BK BLOCK CCD BUS TO Vren OTHER CCD BUS MODULES BK LG Ground BK LG Ground 2 8066092 Name of code Status Failure When monitored With the ignition on Set condition The SKIM does not receive an expected PCM Status CCD BUS message from the PCM within the last 20 seconds Theory of operation The PCM status message informs the SKIM whether the PCM has received a valid key or invalid key message from the SKIM The PCM broadcasts the PCM status every 2 7 seconds on the CCD BUS Possible causes gt CCD BUS circuits open shorted to voltage or shorted to ground gt Failed SKIM gt Failed PCM 8065 310 TEST SK 2A REPAIRING PCM STATUS FAILURE Perform TEST SK 1A Before Proceeding START TEST SK 2A TURN IGNITION OFF USIN
237. M AND SKIM MODULE CHECK THE WIRING AND CONNECTORS FOR POOR TERMINAL CONTACT CORROSION OR DAMAGE ARE ANY OF THESE CONDITIONS PRESENT REPAIR AS NECESSARY REPLACE THE SKIM MODULE SEE GENERAL INFO 8 0 3 USING DRB ERASE CODES DRIVE VEHICLE PERFORM SEVERAL KEY CYCLES USING THE DRB CHECK CODES DOES THIS CODE APPEAR REPLACE THE POWERTRAIN CONTROL MODULE Perform Verification TEST VER 1A TEST COMPLETE Check connectors Clean repair as necessary 321 lt MA lt 120 em o o JMN r e D I OH 2 2 lt MA lt 120 lt JMN r e D I OH S 2 TEST SK 5A TJ BODY SENTRY KEY IMMOBILIZER MODULE REPAIRING TRANSPONDER COMMUNICATION FAILURE Perform TEST SK 1A Before Proceeding ANTENNA FUSED TRANSPONDER CHIP IN KEY cc FUSE BLOCK FUSE 1 TO PDC DB FUSED IGN SWITCH OUTPUT RUN START e 10 AMP FUSE BLOCK FUSE 12 P FUSE 4 TO WT BK CCD BUS 3 CCD BUS BK GROUND IGNITION SWITCH TO OTHER MODULES BK LB GROUND 80b6f cc Name of code Transponder Communication Failure When monitored With the ignition on and during key programming operation Set condition The SKIM fails to receive a valid message from the t
238. M cavity B23 Ground is provided at PCM cavity A4 The 5 volt supply is provided at PCM cavity A17 MOOO mr uUuco Possible cause Sensor signal circuit shorted to ground Failed oil pressure sensor Failed PCM gt Connector terminals Connector wires 80b76fed TJ XJ BODY POWERTRAIN CONTROL OIL MODULE PRESSURE SENSOR OIL PRESSURE SENSOR SIGNAL 2 Np aT 5 VOLT SUPPLY 1 UA SENSOR GROUND 3 TO OTHER SENSORS 80076161 296 TEST 235 REPAIRING OIL PRESSURE SENSOR LOW EXCEEDED Perform TEST DTC Before Proceeding START TEST 235 AND OFF SEVERAL DID THE DRB CONTINUE TEST TIMES DISPLAY THIS CODE TC 119A ON THE USING THE DRB NEXT PAGE READ CODES THIS TIME THE USING THE SCHEMATIC CONDITION REQUIRED AS A GUIDE INSPECT WERE ANY PROBLEMS REPAIR AS SET THE CODE IS gt THE WIRING AND gt FOUND NECESSARY NOT PRESENT CONNECTORS FIG 1 FIG 2 REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL gt TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 2A Check connectors Clean repair as necessary 297 0 MOOO CC TEST 235 CONTINUED REPAIRING OIL PRESSURE SENSOR LOW EXCEEDED TJ XJ BODY ENGIN
239. MITTENT CODES Perform Verification TEST VER 2A Check connectors Clean repair as necessary 213 TEST COMPLETE 0 MOOO mr uUuco 0 MOOO CC TEST TC 115A CONTINUED REPAIRING POWER STEERING SWITCH FAILURE 2 5L TJ XJ POWER STEERING SWITCH CONNECTOR COLOR FUNCTION 1 BK GROUND 2 DB BR POWER STEERING PRESSURE SW SENSE 2 5L TJ XJ 80576127 2 51 TJ XJ POWER STEERING SWITCH CONNECTOR COLOR FUNCTION 1 BK GROUND 2 DB BR POWER STEERING PRESSURE SW SENSE POWERTRAIN CONTROL MODULE BLACK CONNECTOR FUNCTION DB BR POWER STEERING PRESSURE SW SENSE 2 5L TJ XJ 80b76f28 5 115 CONTINUED FROM THE PREVIOUS PAGE ENGINE OFF KEY ON DISCONNECT THE POWER STEERING PRESSURE SWITCH CONNECT A JUMPER WIRE TO THE POWER STEERING PRESSURE SWITCH CIRCUIT FIGs 1 WITH THE DRB MONITOR THE POWER STEERING PRESSURE SWITCH TOUCH THE OTHER END OF THE JUMPER TO GROUND 5 TIMES DID THE POWER STEERING PRESSURE SWITCH CHANGE STATES EST TC 115A CONTINUED REPAIRING POWER STEERING SWITCH FAILURE CONTINUE TEST TC 115A ON THE NEXT PAGE DISCONNECT POWERTRAIN CONTROL MODULE USING AN OHMMETER MEASURE THE P S PRESSURE SW CKT FROM THE PCM TO THE CONN FIG 2 WAS THE RESISTANCE BELOW 5 0 OHMS
240. N COLOR FUNCTION 1 DG LG ASD RELAY OUTPUT TJ 1 DG LG ASD RELAY OUTPUT TJ 1 DG OR ASD RELAY OUTPUT XJ 1 DG OR ASD RELAY OUTPUT XJ 2 WT DB INJECTOR 1 DRIVER 2 WT DB INJECTOR 1 DRIVER POWERTRAIN POWERTRAIN CONTROL MODULE 4 CONTROL MODULE CONNECTORS Cag 7 CONNECTORS COLOR FUNCTION COLOR FUNCTION B4 WT DB INJECTOR 1 DRIVER B4 WT DB INJECTOR 1 DRIVER C12 DG PK ASD RELAY OUTPUT TJ C12 DG PK ASD RELAY OUTPUT C12 DG OR ASD RELAY OUTPUT XJ 30676 C12 DG OR ASD RELAY OUTPUT XJ 80076846 19 5 5 19 DISCONNECT THE INJECTOR 3 CONNECTOR USING AN OHMMETER MEASURE RESISTANCE OF INJECTOR 3 REPAIRING INJECTOR 3 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding IS THE RESISTANCE BETWEEN 10 0 AND 16 0 OHMS REPLACE THE FUEL INJECTOR KEY ON USING THE DRB ACTUATE THE AUTO SHUTDOWN RELAY USING A TEST LIGHT CONNECTED PROBE THE ASD RELAY OUTPUT CIRCUIT FIG 1 2 DOES THE TEST LIGHT ILLUMINATE REPAIR THE ASD RELAY OUTPUT CIRCUIT FOR AN OPEN WITH THE ASD RELAY STILL ACTUATING USING A VOLTMETER MEASURE THE INJECTOR DRIVER CIRCUIT BETWEEN THE INJECTOR HARNESS CONNECTOR AND GROUND IS THE VOLTAGE ABOVE 1 0 VOLTS
241. N CONTROL MODULE MOOO mr oUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 119 TEST TC 31A REPAIRING ECT SENSOR VOLTAGE TOO HIGH Perform TEST DTC Before Proceeding TJ XJ BODY POWERTRAIN CONTROL TO OTHER ENGINE MODULE COOLANT SENSORS TEMPERATURE SENSOR BR YL SENSOR GROUND TN BK ENGINE COOLANT TEMPERATURE SENSOR SIGNAL 4 MOOO mr uUuco 80b0d638 Name of code ECT Sensor Voltage Too High When monitored With the ignition on and battery voltage greater than 10 4 volts Set condition The engine coolant temperature sensor circuit voltage at the PCM goes above 4 98 volts for more than 3 seconds Theory of operation engine coolant temperature sensor is a negative temperature coefficient NTC thermistor type sensor resistance varies inversely with temperature This means at cold temperatures its resistance is high so the voltage signal will be high As coolant temperature increases resistance decreases and the voltage will be low This allows the sensor to provide an analog voltage signal 0 to 5 volt to the PCM Possible causes Sensor signal circuit open or shorted Sensor internally open Sensor ground circuit open PCM failure Connector terminals Connector wires 80604249 TEST TC 31A START TEST TC 31A REPAIRING ECT SENSOR VOLTAGE TOO HIGH Perform TEST DTC Before Proceeding KEY ON USING THE DR
242. NAL CIRCUIT FOR AN OPEN REPLACE THE PCM 0 MOOO CC Perform Verification TEST VER 2A Check connectors Clean repair as necessary 231 TEST TC 132A REPAIRING TPS VOLTAGE DOES AGREE WITH Perform TEST DTC Before Proceeding Name of Code TPS Voltage Does Not Agree with MAP When monitored With the engine running and no MAP sensor or TP sensor trouble codes MOOO mr uUuco Set condition Engine speed must be greater than 1600 RPM fer TPS testing Theory of operation The TP sensor contains a potentiometer that is operated by the throttle blace shaft a throttle plate rotates the TP sensor provides a variable 0 to 5 vclt signal to PCM The voltage is directly proportional to throttle angle When the throttle plate is at rest the voltage is low When the throttle is fully open the voltage is high With this signal the PCM can determine precise throttle position under all operating conditions The TP sensor receives a 5 volt supply from the PCM The sensor ground is provided by the PCM Possible causes Failed powertrain control module P sensor failure Mechanical failure Connector terminals Connector wires Vehicle speed MAP sensor 80660065 5 5 132 EST 132 REPAIRING TPS VOLTAGE DOES AGREE WITH Perform TEST DTC Before Proceeding KEY
243. NAL CKT AND THE SENSOR GROUND CKT FIG 1 I 3 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE SENSOR GROUND CIRCUIT REPLACE THE POWERTRAIN CONTROL MODULE MOOO mr oUco Perform Verification TEST VER 2A Check connectors Clean repair as necessary TEST 27 REPAIRING THROTTLE POSITION SENSOR VOLTAGE HIGH Perform TEST DTC Before Proceeding TJ XJ BODY POWERTRAIN GROUND CONTROL TO OTHER MODULE THROTTLE SENSORS POSITION SENSOR BR YL SENSOR GROUND SIGNAL MOOO mr uUuco OR 5V SUPPLY TO OTHER SENSORS 80b098a4 Name of code Throttle Position Sensor Voltage High When monitored With the ignition on and battery voltage above 10 4 volts Set condition TP sensor voltage at PCM goes above 4 9 volts for 3 2 seconds Theory of operation The throttle position sensor contains a potentiometer that is operated by the throttle blade shaft As the throttle plate rotates the TP sensor provides a variable 0 to 5 volt signal to PCM The voltage is directly proportional to throttle angle When the throttle plate is at rest the voltage is low When the throttle is fully open the voltage is high With this signal the PCM can determine precise throttle position under all operating conditions The TP sensor receives a 5 volt supply from PCM The sensor ground is prov
244. NG CONNECTOR Late 808608319 MOUNTING BOLTS 2 0208316 12 TJ BODY IGNITION COIL CONNECTOR COLOR FUNCTION 1 DG LG RELAY OUTPUT 2 GY IGNITION COIL DRIVER 8006f0e3 TJ BODY SERVO VACUUM MOUNTING LINE SPEED BRACKET I SLEEVE ELECTRICAL 2 TJ XJ BODY CONTROL SERVO CONNECTOR BODY XJ COLOR FUNCTION 1 DG OR 2 GY ASD RELAY OUTPUT IGNITION COIL DRIVER NOTE WIRES CAN BE IN EITHER CAVITY BODY XJ 22 MOUNTING BRACKET COLOR TN RD S C VACUUM SOLENOID CONTROL LG RD S C VENT SOLENOID CONTROL DB RD 5 BRAKE SWITCH OUTPUT BK GROUND 8 13 E ELECTRICAL CONNECTOR Ob04fe4 80212591 80849425 r JJmzmeao 2 0 4 520 2 gt 2 0 4 5200 2 4 3 Data Link Connector TJ BODY 80a4835f XJ BODY TJ BODY 16 WAY CONNECTOR CONNECTOR CCD BUS GROUND GROUND SCI RECEIVE SCI TRANSMIT ISO 9141K CCD BUS FUSED B 80 4508 XJ BODY DATA LINK CONNECTOR 16 WAY DATA LINK CONNECTOR CCD BUS GROUND POWER GROUND SCI RECEIVE TRANSMIT CCD BUS FUSED B 80524 80afb698 4 4 Sensors TJ XJ BODY TJ XJ BODY BATTERY TEMPERATURE SENSOR E COLOR FUNCTION PK YL BATTERY TEMP SENSOR SIGNAL
245. NOID CONTROL CIRCUIT USING AN OHMMETER MEASURE THE EVAP SOLENOID CONTROL CKT TO GROUND FIG 1 OR 2 Perform Verification TEST VER 2A gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SHORT TO GROUND IN THE EVAP SOLENOID CONTROL CIRCUIT Check connectors Clean repair as necessary REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO mr uUuco MOOO 22 TEST 18 CONTINUED REPAIRING EVAP PURGE SOLENOID CIRCUIT 80b27d34 5 18 THE PREVIOUS PAGE STOP ACTUATION OF THE EVAP SOLENOID EST TC 18A CONTINUED REPAIRING EVAP PURGE SOLENOID CIRCUIT DISCONNECT THE VACUUM HOSES FROM THE EVAP SOLENOID BLOW LIGHT AIR INTO THE TOP VACUUM PORT OF THE EVAP SOLENOID FIG 1 DOES THE AIR BLOW OUT THE BOTTOM VACUUM PORT REPLACE THE EVAP SOLENOID USING THE DRB ACTUATE THE EVAP SOLENOID BLOW LIGHT AIR INTO THE TOP VACUUM PORT OF THE EVAP SOLENOID 1 DOES THE AIR BLOW OUT THE BOTTOM VACUUM PORT REPLACE THE EVAP SOLENOID INSPECTED THE EVAP LINES FOR BEING PLUGGED PINCHED CUTS MISROUTING ARE THE LINES OK REPAIR AS NECESSARY
246. NSOR SIGNAL 2 BR YL SENSOR GROUND 80afb69f 122 XJ BODY ENGINE COOLANT TEMP SENSOR CONNECTOR COLOR FUNCTION BR YL SENSOR GROUND TN BK ECT SENSOR SIGNAL 80b098a7 XJ BODY POWERTRAIN CONTROL MODULE BLACK CONNECTOR J COLOR FUNCTION BR YL SENSOR GROUND 16 TN BK ECT SENSOR SIGNAL ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR CAV COLOR FUNCTION 1 BR YL SENSOR GROUND 2 ECT SENSOR SIGNAL 80b0995a 5 31 THE PREVIOUS PAGE KEY OFF DISCONNECT THE ENGINE COOLANT TEMPERATURE ECT SENSOR XX KEY ON USING A VOLTMETER MEASURE THE VOLTAGE OF THE ECT SIGNAL CIRCUIT FIG 1 OR 2 EST TC 31A CONTINUED REPAIRING ECT SENSOR VOLTAGE TOO HIGH IS THE VOLTAGE ABOVE 5 0 VOLTS REPAIR SIGNAL CIRCUIT FOR A SHORT TO Bt VOLTAGE IF OK REPLACE PCM CONNECT A JUMPER BETWEEN THE ECT SENSOR SIGNAL AND SENSOR GROUND CKT FIG 1 OR 2 USING THE DRB READ THE ECT SENSOR VOLTAGE IS THE VOLTAGE BELOW 1 0 VOLT REPLACE THE ENGINE COOLANT TEMPERATURE SENSOR MOVE THE JUMPER WIRE FROM THE SENSOR GROUND TO AN ENGINE GROUND FIG 1 OR 2 USING THE DRB READ THE ECT SENSOR VOLTAGE IS THE VOLTAGE BELOW 1 0 VOLTS
247. NUED FROM THE PREVIOUS PAGE CONTINUED CHECKING THE BRAKE SWITCH SENSE KEY OFF DISCONNECT THE POWERTRAIN CONTROL MODULE HARNESS CONNECTOR IS TERMINAL DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY USING AN MEASURE THE RESISTANCE OF THE BRAKE SWITCH SENSE CIRCUIT AT PCM CONNECTOR TO GROUND FIG 1 OR 2 y IS THE RESISTANCE BELOW 5 0 OHMS SWITCH SENSE CIRCUIT SHORTED TO GROUND USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE BRAKE SWITCH SENSE CKT FROM THE PCM TO THE BRAKE SWITCH FIG 1 OR 2 y IS THE RESISTANCE BELOW 5 0 OHMS POWERTRAIN CONTROL MODULE _ REPAIR THE OPEN BRAKE SWITCH SENSE CIRCUIT BRAKE SWITCH TO PCM 9 0 Perform Verification TEST VER 4A Check connectors Clean repair as necessary 421 104200 TEST SC 5A CHECKING THE SPEED CONTROL OPERATION Perform TEST SC 1A Before Proceeding TEST SC 5A CHECKING THE SPEED CONTROL OPERATION Perform TEST SC 1A Before Proceeding At this time the speed control switch and servo functions appear to operate properly Using the DRB monitor the speed control cutout status Roa
248. NY PROBLEMS REPAIR AS SET THE CODE IS gt GUIDE INSPECT THE FOUND NECESSARY NOT PRESENT WIRING AND FIG 1 CONNECTORS REFER GENERAL INFORMATION 3 3 2 FOR ADDITIONAL TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 1A Check connectors Clean repair as necessary 319 lt MA lt 120 lt mN r uozzz lt MA zmo lt HPN sc E e D I OH S 2 TEST SK 4A CONTINUED REPAIRING SERIAL LINK EXTERNAL FAILURE TJ BODY XJ BODY SENTRY KEY IMMOBILIZER MODULE SENTRY KEY IMMOBILIZER MODULE ANTENNA FUSED FUSED IGN SWITCH OUTPUT RUN START CCD BUS VT BR CCD BUS GROUND ANTENNA Fused Ign Switch Output Run Start Ground Ground 320 TRANSPONDER CHIP IN KEY Cor FUSE UE 1 FUSE 4 IGNITION SWITCH 10 AMP FUSE BLOCK FUSE 12 TO OTHER MODULES 806000 TRANSPONDER CHIP IN KEY PDC JUNCTION BLOCK 10 AMP JUNCTION BLOCK 80561092 TEST SK 4A TEST SK 4A CONTINUED FROM THE PREVIOUS PAGE TURN IGNITION OFF CONTINUED REPAIRING SERIAL LINK EXTERNAL FAILURE USING THE SCHEMATIC AS A GUIDE INSPECT THE CCD BUS CKT S BETWEEN THE PC
249. O CONNECTOR AND GROUND FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS SWITCHED 5 BRAKE SWITCH OUTPUT CIRCUIT FOR A SHORT TO GROUND DISCONNECT THE BRAKE SWITCH CONN KEY ON ENGINE OFF ACTUATE S C VENT SOLENOID MEASURE VOLTAGE OF THE 12V SUPPLY CIRCUIT AT BRAKE SWITCH CONN FIG 2 OR 3 IS THE VOLTAGE ABOVE 10 0 VOLTS gt PERFORM TEST 82 DISCONNECT THE PCM HARNESS CONNECTORS MEASURE RESISTANCE OF 12V SUPPLY CIRCUIT PCM TO BRAKE SWITCH CONN FIG 4 OR 5 IS THE RESISTANCE BELOW 5 0 OHMS gt REPLACE THE POWERTRAIN CONTROL MODULE REPAIR THE 12V SUPPLY CIRCUIT FOR AN OPEN Qo 0m MOOO mr oUuco Perform Verification TEST VER 4A Check connectors Clean repair as necessary 187 0 MOOO CC TEST 82 12V DRIVER CIRCUIT CLOCK SPRING POWERTRAIN CONTROL MODULE BR YL SENSOR GROUND RD LG SPEED CONTROL SW SIGNAL YL RD 12 VOLT SUPPLY WT PK BRAKE SWITCH SENSE SERVO SOLENOIDS TN RD S C VAC SOL CONTROL DB RD 5 BRAKE SW OUTPUT SWITCH 806099 0 TJ XJ BODY COLOR FUNCTION VACUUM SOLENOID CONTROL S C VENT SOLENOID CONTROL S C BRAKE SWITCH OUTPUT GROUND 8
250. O STABILIZE y USING THE DRB READ THE 1 1 AND 1 2 02 SENSOR VOLTAGES gt IS THE VOLTAGE FOR EITHER OF THE 02 SENSORS ABOVE 1 0 VOLT 5 ACTUATION TEST 1 5 02 SENSOR HEATERS NOTE THE 02 SENSOR VOLTAGE STAYING ABOVE 1 0 VOLT INDICATES A PROBLEM WITH THAT SENSOR NOTE THE DRB IS STILL ACTUATING THE 02 SENSOR HEATER TEST OK AT THIS TIME TEST PASSED DISCONNECT THE 02 SENSOR CONNECTOR THAT HAS VOLTAGE ABOVE 1 0 VOLT USING VOLTMETER MEASURE THE ASD RELAY OUTPUT CIRCUIT AT SENSOR CONNECTOR FIG 1 2 3 OR 4 gt IS THE VOLTAGE ABOVE 10 0 VOLTS gt REPAIR THE ASD RELAY OUTPUT CIRCUIT TO THE 02 SENSOR CONNECTOR FOR AN OPEN USING THE DRB STOP THE ACTUATOR TEST USING AN OHMMETER MEASURE THE RESISTANCE BETWEEN THE HEATER GROUND CIRCUIT AND GROUND FIG 1 2 3 OR 4 IS THE RESISTANCE BELOW 5 0 OHMS GROUND CIRCUIT FOR AN OPEN Perform Verification TEST VER 2A Check connectors Clean repair as necessary 365 REPLACE THE 02 SENSOR MOOO mr ocozm oz TEST 12 CHECKING THE IDLE AIR CONTROL MOTOR Perform TEST NTC 1A Before Proceeding BODY POWERTRAIN
251. OLT SUPPLY S C BRAKE SWITCH OUTPUT FUSED B BRAKE LAMP SWITCH OUTPUT 80b099e1 XJ BODY BRAKE LAMP SWITCH CONNECTOR FUNCTION 1 BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED 80 80004166 408 5 10 START TEST SC 1D CHECKING THE SPEED CONTROL SYSTEM Perform TEST SC 1A Before Proceeding DISCONNECT THE BRAKE SWITCH HARNESS CONNECTOR IS ANY TERMINAL PUSHED OUT OR MISWIRED DAMAGED REPAIR AS NECESSARY USE AN OHMMETER IN THE FOLLOWING STEPS MEASURE THE S C BRAKE SWITCH OUTPUT 4 CIRCUIT TO GROUND SERVO CONNECTOR FIG 1 IS THE RESISTANCE 0 OHMS BELOW 5 REPAIR THE SHORT TO GROUND IN THE S C BRAKE SWITCH OUTPUT CIRCUIT 0 400 4 ommo 5 5 SWITCH OUTPUT CIRCUIT FIG 1 AND 2 OR 3 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN IN THE BRAKE SWITCH OUTPUT CIRCUIT USING VOLTMETER MEASURE THE 12 VOLT gt SUPPLY AT BRAKE SWITCH CONN FIG 2 OR 3 NOTE S C VENT SOLENOID IS STILL ACTUATED IS THE VOLTAGE ABOVE 10 0 VOLTS CONTINUE TEST SC 1D ON THE NEXT PAGE gt USING THE SERVICE M
252. OLTAGE OF THE OIL PRESSURE SENSOR SIGNAL CIRCUIT FIG 1 IS THE VOLTAGE ABOVE 5 5 VOLTS EST TC 236A CONTINUED REPAIRING OIL PRESSURE SENSOR HIGH EXCEEDED CONTINUE TEST L TC 236A ON THE NEXT PAGE KEY OFF DISCONNECT THE PCM HARNESS CONNECTOR KEY ON MEASURE THE VOLTAGE OF THE OIL PRESSURE SENSOR SIGNAL CIRCUIT FIG 1 IS THE VOLTAGE BELOW 0 5 VOLT REPAIR THE SHORT TO VOLTAGE IN THE OIL PRESSURE SENSOR SIGNAL CIRCUIT REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO mr uUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 303 TEST 236 CONTINUED REPAIRING OIL PRESSURE SENSOR HIGH EXCEEDED TJ XJ BODY ENGINE OIL PRESSURE SENSOR CONNECTOR Qo 0m MOOO mr oUuco FUNCTION 5 VOLT SUPPLY TJ 5 VOLT SUPPLY XJ OIL PRESSURE SENSOR SIGNAL SENSOR GROUND 80656371 TJ XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS 4 BR YL SENSOR GROUND 17 OR 5 VOLT SUPPLY B24 GY YL OIL PRESSURE SENSOR SIGNAL ENGINE OIL PRESSURE SENSOR CONNECTOR 5 VOLT SUPPLY 5 VOLT SUPPLY XJ OIL PRESSURE SENSOR SIGNAL SENSOR GROUND 800660389 5 236 CONTINUED FROM PREVIOUS PAGE WAS THE VOLTAGE MEASURED IN THE PREVIOUS STEP BETWEEN 4 8 AND 5 3 VOLTS NO E
253. ON 1 D LG ASD RELAY OUTPUT 2 GY IGNITION COIL DRIVER 8006 XJ BODY 1 DG OR ASD RELAY OUTPUT 2 GY IGNITION COIL DRIVER NOTE WIRES we IN EITHER CAVITY FIG 2 80afb591 TEST NS 1A CONTINUED QUALIFYING NO START CONDITION TEST 5 1 CONTINUED FROM THE PREVIOUS PAGE Perform Verification TEST VER 1A USING A VOLTMETER PROBE THE ASD RELAY OUTPUT CIRCUI IN THE COIL CONNECTOR FIG 1 OR 2 IS THE VOLTAGE ABOVE 10 0 VOLTS REPAIR THE OPEN ASD RELAY OUTPUT CKT FROM COIL CONNECTOR TO SPLICE Check connectors Clean repair as necessary 437 CONTINUE TEST gt NS 1A ON THE NEXT PAGE gt 10 OZ TEST 1 CONTINUED QUALIFYING NO START CONDITION 0 40 4 gt 10 OZ COIL TERMINAL PRIMARY TERMINALS TYPICAL VIEW 80657482 1 5 5 1 PREVIOUS PAGE KEY OFF USE AN OHMMETER IN THE FOLLOWING TWO STEPS MEASURE THE RESISTANCE BETWEEN THE PRIMARY TERMINALS OF THE IGNITION COIL FIG 1 CONTINUED QUALIFYING NO START CONDITION gt IS THE PRIMARY RESISTANCE BETWEEN 0 95 1 20 OHMS REPLACE THE IGNITION COIL MEASURE THE RESISTANCE BETWEEN THE PRIMARY AND SECONDARY TERMINALS OF THE COIL FIG 1
254. ON ENGINE DER USING THE DRB READ TROUBLE CODES IS A MAP SENSOR TROUBLE CODE PRESENT PERFORM DTC WITH THE DRB READ THE MAP SENSOR VOLTAGE IS MAP SENSOR VOLTAGE BELOW 3 5 VOLTS 5 NTC 6A START ENGINE gt WITH THE DRB READ THE MAP SENSOR VOLTAGE DID THE MAP SENSOR VOLTAGE DROP FROM ABOVE 3 5 VOLTS TO BELOW 2 0 VOLTS PERFORM TEST NTC 6A CLEAR UNDERSTANDING OF THIS TROUBLE CODE READ FIG 1 gt 5 132 0 MOOO CC Perform Verification TEST VER 2A Check connectors Clean repair as necessary 233 TEST 132 CONTINUED REPAIRING TPS VOLTAGE DOES NOT AGREE WITH TJ XJ BODY THROTTLE POSITION SENSOR CONNECTOR 0 MOOO mr uUucom 3 1 BR YL SENSOR GROUND 2 OR DB TP SENSOR SIGNAL 3 OR 5 SUPPLY 8065067 5 132 CONTINUED FROM THE PREVIOUS PAGE CHECK THROTTLE PLATE AND LINKAGE FOR A BINDING CONDITION ENSURE THE THROTTLE LINKAGE IS AT THE IDLE POSITION NOTE TP SENSOR GND CIRCUIT AND THE 5 VOLT SUPPLY CKT SWITCHED WILL CAUSE THIS CODE TO APPEAR DISCONNECT THE TP S
255. ONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES gt TEST COMPLETE 0 MOOO mr oUucom Perform Verification TEST VER 2A Check connectors Clean repair as necessary 249 0 MOOO mr uUucos TEST TC 150A CONTINUED REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO HIGH TJ BODY FUEL PUMP CONNECTOR COLOR FUNCTION FUEL PUMP RELAY OUTPUT FUEL LEVEL SENSOR SIGNAL SENSOR GROUND GROUND 80061088 XJ BODY FUEL PUMP MODULE CONNECTOR FUNCTION FUEL PUMP RELAY OUTPUT DB LG FUEL LEVEL SENSOR SIGNAL BR YL SENSOR GROUND GROUND 803281216 TEST 150 CONTINUED REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO HIGH TEST TC 150A CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE FUEL PUMP MODULE HARNESS CONNECTOR KEY ON USING A VOLTMETER MEASURE THE FUEL LEVEL SENSOR SIGNAL CIRCUIT AT THE FUEL PUMP MODULE HARNESS CONNECTOR FIG 1 OR 2 REPAIR THE FUEL LEVEL SENSOR CIRCUIT FOR A SHORT TO VOLTAGE CONNECT A JUMPER BETWEEN FUEL LEVEL SIGNAL AND SENSOR
256. ONNECTOR CONNECT A JUMPER ACROSS TERMINALS OF THE BATTERY TEMPERATURE SENSOR FIG 1 USING THE DRB READ BATTERY TEMPERATURE SENSOR VOLTAGE 15 READING EQUAL ZERO REPLACE POWERTRAIN CONTROL MODULE REPLACE THE BATTERY TEMPERATURE SENSOR 0 MOOO III CC M Perform Verification TEST VER 3A Check connectors Clean repair as necessary 0 MOOO CC TEST TC 5A CONTINUED REPAIRING CHARGING VOLTAGE LOW COLOR FUNCTION 1 DG OR GENERATOR SOURCE 2 DG GENERATOR FIELD BK GY B 4 80b6b36c 5 5 5 CONTINUED FROM THE PREVIOUS PAGE USE A VOLTMETER IN THE FOLLOWING STEP MEASURE BETWEEN THE GENERATOR 12V Bt TERMINAL AND THE BATTERY SIDE FIG 1 gt CAUTION ENSURE ALL WIRES ARE CLEAR OF THE ENGINE MOVING PARTS START THE ENGINE CONTINUED REPAIRING CHARGING VOLTAGE TOO LOW gt IS THE VOLTAGE ABOVE 0 4 VOLT CIRCUIT FOR HIGH RESISTANCE BETWEEN THE GENERATOR AND THE BATTERY IGNITION KEY OFF USE A VOLTMETER IN THE FOLLOWING STEP gt MEASURE BETWEEN THE GENERATOR CASE AND BATTERY SIDE FIG 1
257. ONTROL MODULE CONNECTORS COLOR FUNCTION A4 SENSOR GROUND DOWNSTREAM OXYGEN SENSOR SIGNAL C12 ASD RELAY OUTPUT DOWNSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE 1 ASD RELAY OUTPUT 2 GROUND HEATER SENSOR GROUND 4 DOWNSTREAM OXYGEN SENSOR SIGNAL 80b118a8 XJ BODY POWERTRAIN CONTROL MODULE TN WT ASD RELAY Downstream Oxygen Sensor Signal DOWNSTREAM DG OR OXYGEN SENSOR ASD Relay Output BR YL Sensor Ground BK DG Upstream Oxygen Sensor Signal IGNITION COILS GENERATOR AND INJECTORS UPSTREAM OXYGEN SENSOR 80b118a2 XJ 1 1 O2 POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND UPSTREAM OXYGEN SENSOR SIGNAL ASD RELAY OUTPUT UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR 80676964 SIGNAL XJ 1 2 02 POWERTRAIN CONTROL MODULE CONNECTORS FUNCTION DOWNSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE 1 ASD RELAY OUTPUT 2 GROUND HEATER SENSOR GROUND 4 DOWNSTREAM OXYGEN SENSOR SIGNAL 80b118a9 5 5 NTC 11A EST 11 CHECKING THE OXYGEN SENSOR HEATER Perform TEST NTC 1A Before Proceeding KEY ON USING THE DRB ACTUATE THE O2 SENSOR HEATER TEST NOTE USE THE APPROPRIATE O2 SENSOR CONNECTOR WHEN USING THIS TEST 1 1 OR 1 2 WAIT TWO MINUTES FOR THE O2 SENSOR VOLTAGES T
258. OR AN OPEN KEY ON USING A VOLTMETER MEASURE THE 5 VOLT SUPPLY CIRCUIT AT THE CAM SENSOR HARNESS CONNECTOR FIG 1 IS THE VOLTAGE ABOVE 4 0 VOLTS REPAIR THE 5 VOLT SUPPLY CIRCUIT FOR AN OPEN CONNECT ONE END OF A JUMPER WIRE TO THE CMP SENSOR SIGNAL CIRCUIT FIG 1 USING THE DRB MONITOR CMP COUNT WHILE TAPPING THE END OF THE JUMPER TO SENSOR GROUND DOES THE CURRENT CMP COUNT CHANGE PERFORM TEST gt TC 1B Perform Verification TEST VER 2A CONTINUE TEST gt TC 1A ON THE NEXT PAGE Check connectors Clean repair as necessary 0 MOOO 0 0 70 TEST TC 1A CONTINUED REPAIRING CAM SIGNAL PCM TJ XJ BODY CAMSHAFT POSITION SENSOR CONNECTOR 0 MOOO mr uUuco 1 TN YL CAMSHAFT SENSOR SIGNAL 2 BR YL SENSOR GROUND 3 OR 5 VOLT SUPPLY POWERTRAIN CONTROL MODULE BLACK CONNECTOR FUNCTION SENSOR GROUND 5 VOLT SUPPLY CAMSHAFT POSITION SENSOR SIGNAL BDafb 5ch 1 5 1 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS CONTINUED REPAIRING NO CAM SIGNAL AT PCM USING AN OHMMETER MEASURE THE RESISTANCE OF THE CMP SENSOR SIGNAL CIRCUIT BETWEEN THE CMP SENSOR CONNECTOR AND TH
259. OR EITHER MEASUREMENT CIRCUIT S THAT MEASURED BELOW 5 0 OHMS FOR A SHORT TO GROUND RECONNECT THE S C SERVO HARNESS CONNECTOR DISCONNECT THE PCM HARNESS CONNECTORS zi USE AN OHMMETER IN THE FOLLOWING STEPS 55 5 11 5 2 IS THE RESISTANCE BETWEEN 35 0 AND 55 0 OHMS MEASURE BETWEEN PCM HARNESS CONNECTOR CAVITIES C11 AND FIG 2 IS THE RESISTANCE BETWEEN 35 0 AND 55 0 OHMS Perform Verification TEST VER 4A c gt CONTINUE TEST TC 15B ON THE NEXT PAGE CONTINUE TEST 15 THE REPLACE THE POWERTRAIN CONTROL MODULE Check connectors Clean repair as necessary 0 MOOO 22 TEST 15 CONTINUED REPAIRING SPEED CONTROL CIRCUITS POWERTRAIN CONTROL MODULE CONNECTORS MOOO mr uUco SENSOR GROUND S C VACUUM SOL CTRL S C VENT SOL CONTROL 12 VOLT SUPPLY BRAKE SWITCH SENSE S C SWITCH SIGNAL SPEED CONTROL SERVO CONNECTOR LG RD S C VENT SOLENOID CTRL DB RD 5 BRAKE SW OUTPUT GROUND 806041685 TEST 15 CONTINUED REPAIRING SPEED CONTROL CIRCUITS TEST TC 15B CONTINUED FROM THE PREVI
260. ORM 5 5 NS SEL AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER GEN INFO 3 3 2 FOR INFORMATION ON INACTIVE TROUBLE CODES Perform Verification TEST VER 2A 155 gt TEST COMPLETE Check connectors Clean repair as necessary Qo 0m MOOO CC MOOO mr uUuco TEST TC 43A Perform TEST DTC Before Proceeding TJ BODY POWERTRAIN CONTROL MODULE IGNITION GY COIL IGNITION CCIL DRIVER DG LG ASD RELAY OUTPUT 8066I0CI SPARK PLUG CABLE SPARK TESTER 80 2432 REPAIRING IGNITION COIL 1 PRIMARY CIRCUIT XJ BODY POWERTRAIN CONTROL MODULE IGNITION GY COIL IGNITION COIL DRIVER DG OR ASD RELAY OUTPUT 80009950 Name of code Coil Primary Circuit When monitored With battery voltage greater than 8 volts during engine cranking or greater than 12 volts with engine running and with engine rpm less than 2016 and none of the coils in dwell when checked Set condition Peak current is not achieved with battery based dwell plus 1 5 msec of diagnostic offset Ittakes lessthan 3 seconds during cranking or up to 6 seconds while running to set Theory of operation The ign
261. OSPNI 1 1 1 amp Sid HOLOZPNI um Ei HOSNES avid STOA S rs LJ VHSDINYHO 1 NOLLISOd ely lJvHSAVO 0ICM31089 108 2222 085 9100CVV 1 HOSN3S NIVHLH3MOd 03348 TOHIA HOSNIS een 9104105 201 2310 5990928 SLIOA 8 A IONS108 He Wod 88 E 099 HOSN3S MV9I OLN Sal Fey NOLLISOd 29 911109M9ML 725 1 105 4 89 620 240309008 103 UOSNSS 1491009 SNIDNS WAL Ev AS zi M ALAIN gt HOSNSS 29 9VI31 3XVIMI 1 LO 09M36 18311303 gt 1 x 515 5 8 10 HOSNI ESCH N Sid m y 88 805095 TEAST TNs 7 1 gt ERE ENS HOLIMS Sid E i 1 HOSN3S 34155394 10 gt 5 8 10 2 Ow Z U X et 2 IOH1NOO IV 2 0 18NI HOLIMS HOMS 5 9 4531 H3MOd 496 O uU UC lt
262. OT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY START ENGINE WIGGLE WIRING HARNESS FROM THE INJECTOR TO THE PCM DOES THE ENGINE MISS OR STALL 5 NECESSARY WHERE WIGGLING CAUSED PROBLEM TO APPEAR REFER TO GENERAL INFORMATION 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES TEST COMPLETE 0 MOOO mr uUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 0 MOOO CC TEST 21 CONTINUED REPAIRING INJECTOR CONTROL CIRCUITS NOTES 88 TEST 21 CONTINUED REPAIRING INJECTOR CONTROL CIRCUITS Refer to the chart below and perform the diagnostic test that corresponds to the trouble code displayed on the DRB TROUBLE CODE DIAGNOSTIC TEST INJECTOR 1 CONTROL CIRCUIT TC 21B INJECTOR 2 CONTROL CIRCUIT TC 20A INJECTOR 3 CONTROL CIRCUIT TC 19A INJECTOR 4 CONTROL CIRCUIT TC 61A INJECTOR 5 CONTROL CIRCUIT TC 69A INJECTOR 6 CONTROL CIRCUIT TC 70A Qo 0m MOOO mr uUucox MOOO mr uUuco TEST 21 REPAIRING INJECTOR 1 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding INJECTOR 3 CONNECTOR ASD RELAY OUTPUT TJ ASD RELAY OUTPUT XJ INJECTO
263. OUS PAGE DISCONNECT THE S C SERVO 4 WAY CONNECTOR USING AN OHMMETER MEASURE THE S C VACUUM SOLENOID CONTROL CIRCUIT BETWEEN THE S C SERVO AND PCM FIG 1 gt IS THE RESISTANCE BELOW 5 0 OHMS S C VACUUM SOLENOID CONTROL CIRCUIT USING AN OHMMETER MEASURE THE S C VENT SOLENOID CONTROL CIRCUIT BETWEEN THE S C SERVO AND PCM IS THE RESISTANCE BELOW 5 0 OHMS 5 VENT SOLENOID CONTROL CIRCUIT REPLACE THE SPEED CONTROL SERVO MOOO mr oUco Perform Verification TEST VER 4A Check connectors Clean repair as necessary TEST 16 REPAIRING A C CLUTCH RELAY CIRCUIT Perform TEST DTC Before Proceeding TJ BODY TO IGN SWITCH START RUN FUSED IGNITION SWITCH OUTPUT TO BATTERY 86 A C CLUTCH POWERTRAIN CONTROL 85 MODULE DB OR DB BK A G GMP CLUTCH A C CMP CLUTCH RELAY CONTROL RELAY OUTPUT COMPRESSOR CLUTCH 0 MOOO CC M 80b6f0d1 XJ BODY TO IGN SWITCH START RUN BATTERY A C CLUTCH POWERTRAIN RELAY CONTROL MODULE 85 87 DB OR DB BK Clutch Clutch Relay Control Relay Output TO A C p COMPRESSOR CLUTC
264. P SYSTEM RELAY CONTROL CIRCUIT TJ BODY FUEL PUMP RELAY D POWER DISTRIBUTION CENTER PDC RELAY SECTION d FUNCTION TJ BODY TJ BODY FUSED FUEL PUMP RELAY OUTPUT FUSED IGNITION SWITCH OUTPUT FUEL PUMP RELAY CONTROL 80b6f0e9 XJ BODY 80b76e97 XJ BODY POWERTRAIN CONTROL MODULE GREY CONNECTOR C19 BR FUEL PUMP RELAY CONTROL FUEL PUMP RELAY CONNECTOR IN PDC COLOR FUNCTION XJ BODY POWER DISTRIBUTION CENTER PDC RELAY SECTION FUEL PUMP RELAY coLoR FUNCTION FUSED FUEL PUMP RELAY OUTPUT FUSED IGNITION SWITCH OUTPUT FUEL PUMP RELAY CONTROL 80b6f0e0 80076 98 POWERTRAIN CONTROL MODULE GREY CONNECTOR C19 BR FUEL PUMP RELAY CONTROL FUEL PUMP RELAY CONNECTOR IN PDC FUNCTION COLOR DG BK DG WT FUSED FUEL PUMP RELAY OUTPUT DG BK FUSED B FUSED IGNITION SWITCH OUTPUT DB BR FUSED IGNITION SWITCH OUTPUT FUEL PUMP RELAY CONTROL 0 7 5 204 DG WT FUEL PUMP RELAY CONTROL FUEL PUMP RELAY OUTPUT
265. PAGE DISCONNECT THE INTAKE AIR TEMPERATURE IAT SENSOR USING A VOLTMETER MEASURE THE VOLTAGE OF THE IAT SIGNAL CIRCUIT FIG 1 2 EST TC 58A CONTINUED REPAIRING INTAKE AIR TEMP SENSOR VOLTAGE HIGH IS THE VOLTAGE ABOVE 6 0 VOLTS gt REPAIR IAT SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE CONNECT A JUMPER WIRE ACROSS THE IAT SIGNAL AND SENSOR GROUND CIRCUITS FIG 1 OR 2 USING THE DRB READ THE INTAKE AIR TEMPERATURE SENSOR VOLTAGE IS THE VOLTAGE BELOW 1 0 VOLTS REPLACE THE INTAKE AIR TEMPERATURE SENSOR MOVE THE JUMPER WIRE FROM THE SENSOR GROUND TO AN ENGINE GROUND FIG 1 OR 2 READ THE INTAKE AIR TEMPERATURE SENSOR VOLTAGE IS THE VOLTAGE BELOW 1 0 VOLTS SENSOR GROUND CIRCUIT KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS USING AN OHMMETER MEASURE THE RESISTANCE OF THE IAT SENSOR SIGNAL BETWEEN THE PCM AND THE IAT SENSOR FIG 3 OR 4 IS THE RESISTANCE BELOW 5 0 OHMS POWERTRAIN CONTROL MODULE Perform Verification TEST VER 2A Check connectors Clean repair as necessary 173 L REPAIR THE INTAKE AIR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN OP
266. PCM goes below 08 volt Theory of operation The intake air temperature sensor IAT is located in the intake manifold where it measures the temperature of the air that is about to enter the combustion chambers The IAT is a negative temperature coefficient NTC thermistor type sensor resistance varies inversely with temperature This means at cold temperatures its resistance is high so the voltage signal will be high At high temperatures resistance decreases and the voltage signal will decrease This allows the sensor to provide an analog voltage signal to the PCM The PCM uses this signal to compensate for changes in air density due to temperature Qo 0m MOOO mr uUuco Possible causes Sensor signal circuit shorted to ground Sensor internally shorted Powertrain control module failure Connector terminals Connector wires 80aa0f76 TJ XJ BODY POWERTRAIN CONTROL GROUNDTO MODULE OTHER SENSORS INTAKE AIR TEMPERATURE BR YL SENSOR Sensor Ground BK RD Intake Air Temperature Signal 80b118a4 166 TEST 57 5 5 57 REPAIRING INTAKE AIR TEMP SENSOR VOLTAGE LOW Perform TEST DTC Before Proceeding USING THE DRB READ THE INTAKE AIR TEMPERATURE SENSOR VOLTAGE IS THE INTAKE AIR TEMPERATURE SENSOR VOLTAGE BELOW 0 5 VOLT gt 5 57
267. PER WIRE TO THE CKP SENSOR SIGNAL CIRCUIT FIG 1 USING THE DRB MONITOR CMP COUNT WHILE TAPPING THE END OF THE JUMPER TO SENSOR GROUND DOES THE CURRENT CKP COUNT CHANGE REPLACE THE CKP SENSOR Perform Verification TEST VER 2A Check connectors Clean repair as necessary 151 CONTINUE TEST gt 40 0 MOOO 0 0 70 TEST 40 CONTINUED REPAIRING NO CRANK REFERNCE SIGNAL TJ XJ BODY CRANKSHAFT POSITION SENSOR CONNECTOR 0 MOOO CC M FUNCTION 1 GY BK CRANKSHAFT POSITION SENSOR SIGNAL 2 BR YL SENSOR GROUND 3 5 VOLT SUPPLY 80609956 TJ XJ BODY CRANKSHAFT POSITION SENSOR CONNECTOR COLOR CRANKSHAFT POSITION SENSOR SIGNA SENSOR GROUND 5 VOLT SUPPLY 1 GY BK L 2 BR YL 3 OR POWERTRAIN CONTROL MODULE BLACK CONNECTOR A4 BR YL SENSOR GROUND CRANKSHAFT POSITION SENSOR SIGNAL 17 5 VOLT SUPPLY 5 40 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS EST TC 40A CONTINUED REPAIRING NO CRANK REFERNCE SIGNAL AT PCM USING AN OHMMETER MEASURE THE RESISTANCE OF THE CKP SENSOR SIGNAL CIRCUIT BETWEEN THE CKP SENSOR CONNECTOR AND THE PCM FIG 2 gt IS T
268. PLY TJ 5 VOLT SUPPLY XJ OIL PRESSURE SENSOR SIGNAL SENSOR GROUND 80b8b37f POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND 5 VOLT SUPPLY OIL PRESSURE SENSOR SIGNAL ENGINE OIL PRESSURE SENSOR CONNECTOR 5 VOLT SUPPLY TJ 5 VOLT SUPPLY XJ OIL PRESSURE SENSOR SIGNAL SENSOR GROUND 80b6b38a TEST 21 CHECKING THE OIL PRESSURE SENDING UNIT Perform TEST NTC 1A Before Proceeding START TEST NTC 21A TURN IGN OFF PUSH AND HOLD THE TRIP ODOMETER BUTTON WHILE TURNING THE IGN SW TO RUN NOTE THIS WILL PUT THE CLUSTER IN SELF TEST OBSERVE THE OIL PRESSURE GAUGE DURING THE SELF TEST FIG 1 DID THE GAUGE REACH ITS CALIBRATION POINTS 0 40 AND 80 REPLACE THE INSTRUMENT CLUSTER KEY OFF DISCONNECT THE OIL PRESSURE SENSOR HARNESS CONNECTOR USING AN VOLTMETER MEASURE THE OIL PRESSURE SIGNAL CIRCUIT FIG 2 gt IS THE VOLTAGE ABOVE 4 0 VOLTS CONTINUE TEST gt NTC 21A ON NEXT PAGE KEY OFF DISCONNECT THE POWERTRAIN CONTROL MODULE HARNESS CONNECTOR USING AN OHMMETER MEASURE THE SIGNAL CKT FROM THE PCM TO THE SENSOR FIG 3 15 5 5 BELOW 5 0 OHMS REPAIR THE OPEN OIL PRESSURE SIGNAL CIRCUIT USING AN OHMMETER M
269. R USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE RESISTANCE BETWEEN THE MAP SENSOR SIGNAL CIRCUIT AND THE MAP SENSOR GROUND CIRCUIT AT MAP SENSOR CONNECTOR FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE MAP SENSOR SIGNAL CIRCUIT SHORTED TO MAP SENSOR GROUND CIRCUIT USING AN OHMMETER MEASURE THE RESISTANCE OF THE MAP SENSOR SIGNAL CIRCUIT AT MAP SENSOR CONNECTOR TO GROUND FIG 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE MAP SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO mr uUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 137 0 MOOO CC TEST TC 36A REPAIRING MAP SENSOR VOLTAGE LOW NO 5 VOLTS ENSOR TJ XJ BODY MAP SENSOR CONNECTOR FUNCTION 3 OR 5 VOLT SUPPLY 2 DG RD SENSOR SIGNAL 1 SENSOR GROUND POWERTRAIN CONTROL MODULE BLACK CONNECTOR 4 GROUND 17 5 VOLT SUPPLY A27 DG RD SENSOR SIGNAL 154 TEST TC 36A TEST TC 36A CONTINUED FROM THE PREVIOUS PAGE TURN IGNITION OFF DISCONNECT THE POWERTRAIN CONTROL MODULE HARNESS CONNECTOR USE OHMMETER
270. R 3 DRIVER INJECTOR 3 CONNECTOR COLOR FUNCTION 1 1 2 DG LG ASD RELAY OUTPUT TJ DG OR ASD RELAY OUTPUT XJ YL WT INJECTOR 3 DRIVER POWERTRAIN CONTROL MODULE CONNECTORS COLOR FUNCTION B5 INJECTOR 3 DRIVER C12 DG PK ASD RELAY OUTPUT TJ C12 DG OR ASD RELAY OUTPUT XJ 80b76e65 80b76ea4 INJECTOR 3 CONNECTOR ASD RELAY OUTPUT TJ ASD RELAY OUTPUT Xu INJECTOR 3 DRIVER 80b76e69 INJECTOR 3 CONNECTOR COLOR FUNCTION 1 ASD RELAY OUTPUT 1 DG OR ASD RELAY OUTPUT XJ 2 YUWT INJECTOR 3 DRIVER POWERTRAIN CONTROL MODULE CONNECTORS COLOR FUNCTION B5 L WT INJECTOR 3 DRIVER C12 DG PK ASD RELAY OUTPUT C12 DG OR ASD RELAY OUTPUT XJ 80078888 21 5 5 21 DISCONNECT THE INJECTOR 1 CONNECTOR USING AN OHMMETER MEASURE RESISTANCE OF INJECTOR 1 REPAIRING INJECTOR 1 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding IS THE RESISTANCE BETWEEN 10 0 AND 16 0 OHMS REPLACE THE FUEL INJECTOR KEY ON USING THE DRB ACTUATE THE AUTO SHUTDOWN RELAY USING TEST LIGHT CONNECTED TO GROUND PROBE THE ASD RELAY OUTPUT CIRCUIT FIG 1 2 DOES THE TEST LIGHT ILLUMINATE REPAIR THE ASD RELAY OUTPUT CIRCUIT FOR AN OPEN
271. R AS NECESSARY NO y REPAIR THE BATTERY TEMPERATURE SENSOR USING THE DRB UNDER BODY READ TROUBLE CODES ARE THERE ANY AMBIENT BATTERY TEMP SENSOR TROUBLE CODES REFER TO BODY DIAGNOSTIC PROCEDURE MANUAL TEMPERTURE SENSOR MOOO III CC M Perform Verification TEST VER 3A Check connectors Clean repair as necessary MOOO CC M TEST TC 6B CONTINUED REPAIRING CHARGING SYSTEM VOLTAGE HIGH NOTES 48 TEST TC 6B TEST 6 CONTINUED FROM THE PREVIOUS PAGE START THE ENGINE MANUALLY SET THE ENGINE SPEED TO 1600 RPM gt WITH THE DRB READ BOTH THE VOLTAGE SENSE AND THE TARGET CHARGING VOLTAGE CONTINUED REPAIRING CHARGING SYSTEM VOLTAGE HIGH COMPARE THE TARGET TO THE VOLT READING WATCH FOR UP TO 5 MINUTES IF gt NECESSARY FOR A 1 0 VOLT DIFFERENCE OR MORE WAS THERE MORE THAN A 1 0 VOLT DIFFERENCE REPLACE THE POWERTRAIN CONTROL MODULE ALLOW THE ENGINE TO RETURN TO IDLE SPEED TURN ENGINE OFF IGNITION KEY ON ERASE TROUBLE CODES PERFORM TEST CH 1A 0 MOOO
272. R HARNESS CONNECTOR TO THE PCM HARNESS CONNECTOR FIG 1 OR 2 WAS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SENSOR SIGNAL CIRCUIT FOR AN OPEN REPLACE THE PCM 0 MOOO CC Perform Verification TEST VER 2A Check connectors Clean repair as necessary 181 0 MOOO mr uUco TEST TC 69A REPAIRING INJECTOR 5 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding INJECTOR 5 CONNECTOR 80b76e6b INJECTOR 5 CONNECTOR COLOR FUNCTION 1 DG LG ASD RELAY OUTPUT TJ 1 DG OR ASD RELAY OUTPUT 2 PK BK INJECTOR 5 DRIVER POWERTRAIN CONTROL MODULE CONNECTORS COLOR FUNCTION 86 PK BK INJECTOR 5 DRIVER C12 DG PK ASD RELAY OUTPUT TJ C12 DG OR ASD RELAY OUTPUT XJ 80b78eaa TEST TC 69A REPAIRING INJECTOR 5 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding KEY OFF START TEST DISCONNECT THE TC 69A INJECTOR 5 CONNECTOR USING AN OHMMETER IS THE RESISTANCE REPLACE THE FUEL MEASURE RESISTANCE BETWEEN 10 0 AND INJECTOR OF INJECTOR 5 16 0 OHMS USING A TEST REPAIR THE ASD KEY ON USING THE LIGHT PROBE THE DOES THE TEST RELAY OUTPUT DRB ACTUATE AUTO ASD RELAY OUTPUT LIGHT ILLUMINATE CIRCUIT FOR AN SHUTDOWN RELAY CIRCUIT OPEN 1 WITH TH
273. R ID MISMATCH TRANSPONDER RESPONSE MISMATCH VIN MISMATCH trouble codes indicate an internal SKIM fault Using the DRB clear trouble code s Perform several key cycles leaving the key on for a minimum of 30 seconds per cycle Using the DRB read SKIM trouble codes If the trouble code is present replace the SKIM NOTE An intermittent start and stall condition accompanied with a transponder DTC can be caused by the presence of a non programmed key or key programmed to another vehicle near the SKIM antenna ignition halo This can occur if the customer has a key holder ring that contains more than one key equipped with a transponder chip After replacement of the Sentry Key Immobilizer Module SKIM see GENERAL INFORMATION SECTION 8 0 for SKIM initialization NOTE For all component locations REFER TO GENERAL INFORMATION Section 4 0 in this manual 306 TEST SK 1A IDENTIFYING SENTRY KEY IMMOBILIZER SYSTEM Perform TEST DTC Before Proceeding NOTE The Sentry Key Immobilizer System SKIS diagnosis may require usage of the customer s additional keys to verify the cause of the system failure In the event that the Sentry Key Immobilizer Module SKIM needs replacing all of the keys previously programmed into the SKIM s memory must be programmed into the new SKIM THEREFORE IT IS IMPORTANT THAT ALL OF THE CUSTOMER S KEYS PROGRAMMED FOR THE VEHICLE BE OBTAINED PRIOR TO
274. R SIGNAL AND THE SENSOR GND CKT FIG 1 USING THE DRB READ THE BATTERY TEMP SENSOR VOLTAGE IS THE BATTERY TEMPERATURE VOLTAGE BELOW 1 0 VOLT REPLACE THE BATTERY TEMPERATURE SENSOR MOVE THE JUMPER WIRE FROM THE SENSOR GROUND TO AN ENGINE GROUND FIG 1 WITH THE DRB READ THE BTS VOLTAGE IS THE VOLTAGE BELOW 1 0 VOLT REPAIR THE SENSOR GROUND CIRCUIT FOR AN OPEN KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS USING 5 SIGNAL CIRCUIT FROM THE PCM TO THE BTS CONN FIG 2 15 5 5 BELOW 5 0 OHMS REPLACE THE POWERTRAIN CONTROL MODULE REPAIR THE BATTERY TEMP SENSOR SIGNAL CIRCUIT FOR AN OPEN 0 MOOO CC Perform Verification TEST VER 2A Check connectors Clean repair as necessary 263 4 MOOO mr uUuco TEST TC 155A REPAIRING 1 1 O2 SENSOR SHORTED TO GROUND Perform TEST DTC Before Proceeding Name of Code 025 Voltage Shorted To Ground When monitored With engine coolant temperature above 170 F on the previous key on after cold start engine coolant below 98 F and ambient battery sensor reading within 27 F of engine coolant Set condition The oxygen sensor signal vol
275. R THE PARK NEUTRAL SWITCH INPUT STATE USING JUMPER WIRE CONNECT ONE END TO THE P N POSITION SWITCH SENSE CIRCUIT AND THE OTHER END TO A KNOWN GOOD GROUND FIG 1 REPAIR THE SHORT TO VOLTAGE IN THE P N POSITION SWITCH SENSE CIRCUIT DOES THE DISPLAY ON THE DRB CHANGE TO P N gt REPLACE THE TRANSMISSION RANGE SENSOR POWERTRAIN CONTROL MODULE MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 383 0 400 4 MOOO oz TEST NTC 20B CHECKING THE PARK NEUTRAL POSITION SWITCH Perform TEST NTC 21A Before Proceeding TJ BODY 2 5L AND 4 01 AUTO TRANS TO POWERTRAIN STARTER CONTROL MODULE RELAY P N POSITION BR LB P N Position Switch Sense VT BK Back Up Lamps Feed VT WT TO FUSED IGNITION SWITCH OUTPUT 80b11885 XJ BODY 2 5L AUTO TRANS STARTER CONTROL MODULE RELAY P N POSITION BKWT P N Position SWITCH BR LG Back Up Lamps Feed 3 WT TO FUSED IGNITION SWITCH OUTPUT 80061096 POWERTRAIN CONTROL MODULE BLACK CONNECTOR COLOR FUNCTION BK WT PARK NEUTRAL POSITION SW SENSE XJ 2 51 BR LB PARK NEUTRAL POSITION SW SENSE TJ 2 5L 4 0L PARK NEUTRAL POSITION SWITCH
276. RANSPONDER IMMOBILIZER MODULE DB GY PDC FusedB ZA WT BK JUNCTION BLOCK Fused Ign Switch 10 AMP Output Run Start 6 JUNCTION WT BK BLOCK CCD BUS TO Vren OTHER CCD BUS MODULES BK LG Ground BK LG Ground 8066092 Name of code Rolling Code Failure When monitored With the ignition on Set condition The SKIM does not receive an expected EMS status CCD BUS message from the PCM within 3 5 seconds of transmitting a valid key message to the PCM Theory of operation After determining the ignition key is a valid key the SKIM sends a coded valid key CCD BUS message to the PCM The SKIM expects a CCD BUS message acknowledgment from the PCM Possible cause gt CCD BUS circuits open shorted to voltage or shorted to ground gt Failed SKIM gt Failed PCM 80bScc6t 314 TEST 5 REPAIRING ROLLING CODE FAILURE Perform TEST SK 1A Before Proceeding START TEST SK 3A TURN IGNITION OFF USING THE DRB DOES THE DRB CONTINUE TEST WAIT 10 SECONDS READ CODES gt DISPLAY THIS CODE gt SK 3A ON THE TURN IGNITION ON NEXT PAGE 5 USING THE CONDITION REQUIRED SCHEMATIC AS A WERE ANY PROBLEMS REPAIR AS SET THE CODE IS gt GUIDE INSPECT THE FOUND NECESSARY NOT PRESENT WIRING AND FIG 1 CONNECTORS
277. RB ACTUATE THE ASD RELAY gt USING A TEST LIGHT CONNECTED TO GROUND PROBE THE P N POSITION SW SENSE FIG 1 gt DOES THE TEST LIGHT ILLUMINATE BRIGHTLY YES NOTE THE TEST LIGHT MAY ILLUMINATE VERY DIM THIS SHOULD BE CONSIDERED NORMAL OPERATION STOP ACTUATION USING THE DRB MONITOR THE PARK NEUTRAL SWITCH INPUT STATE USING JUMPER WIRE CONNECT ONE END TO THE P N POSITION SWITCH SENSE CIRCUIT AND THE OTHER END TO A KNOWN GOOD GROUND FIG 1 REPAIR THE SHORT TO VOLTAGE IN THE P N POSITION SWITCH SENSE CIRCUIT DOES THE DISPLAY ON THE DRB CHANGE TO P N gt REPLACE THE PARK NEUTRAL POSITION SWITCH POWERTRAIN CONTROL MODULE 0 400 4 MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 387 MOOO 254 oz TEST 21 CHECKING THE OIL PRESSURE SENDING UNIT Perform TEST NTC 1A Before Proceeding TJ XJ BODY TJ XJ BODY CLUSTER SYSTEM TEST CALIBRATION POINTS E E 22111 _ 212 ENGINE OIL PRESSURE SENSOR CONNECTOR 80 4435 FUNCTION 5 VOLT SUP
278. REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES gt TEST COMPLETE 0 MOOO mr uUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 245 0 MOOO mr uUucos TEST TC 149A CONTINUED REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO LOW TJ BODY FUEL PUMP CONNECTOR COLOR FUNCTION FUEL PUMP RELAY OUTPUT FUEL LEVEL SENSOR SIGNAL SENSOR GROUND GROUND 80061088 XJ BODY FUEL PUMP MODULE CONNECTOR FUNCTION FUEL PUMP RELAY OUTPUT DB LG FUEL LEVEL SENSOR SIGNAL BR YL SENSOR GROUND GROUND 803281216 EST 149 CONTINUED REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO LOW TEST TC 149A CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE FUEL PUMP MODULE HARNESS CONNECTOR KEY ON USING THE DRB READ THE FUEL LEVEL SENDING UNIT VOLTAGE gt IS THE FUEL LEVEL SENDING UNIT VOLTAGE ABOVE 9 5 VOLTS REPLACE THE FUEL PUMP MODULE KEY OFF DISCONNECT THE POWERTRAIN CONTROL MODULE HARNESS CONN USE AN OHMMETER IN THE FOLLOWING STEPS MEASURE THE RESISTANCE OF THE FUEL LEVEL SENSOR SIGNAL CIRCUIT TO GROUND FIG 1 OR 2 gt 5
279. RTRAIN CONTROL gt DAMAGED PUSHED NECESSARY MODULE HARNESS OUT OR MISWIRED CONNECTOR MEASURE RESISTANCE OF THE IAC 1 IS THE RESISTANCE REPLACE THE DRIVER CIRCUIT gt BELOW 5 0 OHMS gt POWERTRAIN CONTROL BETWEEN PCM amp IAC MODULE 1 REPAIR THE OPEN IDLE AIR CONTROL MOTOR DRIVER CIRCUIT Perform Verification TEST VER 2A Check connectors Clean repair as necessary 101 0 MOOO mr oUco TEST 25 REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS Perform TEST TC 25A Before Proceeding TJ XJ BODY POWERTRAIN CONTROL MODULE BLACK CONNECTOR IAC 3 DRIVER IAC 2 DRIVER IAG 4 DRIVER IAC 1 DRIVER MOOO mr uUuco IDLE AIR CONTROL MOTOR CONNECTOR IAC 1 DRIVER IAC 2 DRIVER IAC 3 DRIVER IAC 4 DRIVER 80689863 POWERTRAIN CONTROL MODULE VB IAC MOTOR DRIVER 4 20 BR WT IAC MOTOR DRIVER 3 E YL BK 8 IAC MOTOR DRIVER 2 GY RD 19 IAC MOTOR DRIVER 1 IDLE AIR CONTROL MOTOR 6 TEST 25 REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS Perform TEST TC 25A Before Proceeding KEY OFF DISCONNECT START TEST THE POWERTRAIN IS ANY TERMINAL REPAIR AS TC 25C CONTROL MODULE m DAMAGED PUSHED NECESSARY X HARNESS CONNECTOR OUT OR MISWIRED MEASURE RESISTANCE OF THE IAC 2 IS THE RESI
280. S 4 5 N gt VI THROTTLE LW POSITION 9 SENSOR Ce SW IDLE AIR grs CONTROL PASSAGE MAP INLET 3 SENSOR 80 87223 TJ BODY INTAKE AIR TEMPERATURE SENSOR CONNECTOR 1 BK RD IAT SIGNAL 2 BR YL SENSOR GROUND 80 501 TJ XJ BODY MAP SENSOR CONNECTOR COLOR FUNCTION 5 VOLT SUPPLY MAP SENSOR SIGNAL SENSOR GROUND 3 2 DG RD 1 80afa155 02 SENSOR CONFIGURATION TJ2 5L 1 1 UPSTREAM TJ2 5L 1 2 DOWNSTREAM XJ2 5L 1 1 UPSTREAM XJ2 5L 1 2 DOWNSTREAM TJ4 0L 1 1 UPSTREAM TJ4 0L 1 2 DOWNSTREAM XJ4 0L 11 UPSTREAM XJ4 0L 1 2 DOWNSTREAM 80b76ec3 XJ 2 5L amp 4 0L 1 1 SENSOR J9514 17 TJ BODY 1 1 UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE COLOR FUNCTION OR DG ASD Relay Output BK Ground Heater Sensor Ground BK DG Oxygen Sensor Signal hon 2 amp 0b6f0e5 TJ 2 5L amp 4 0L 1 1 UPSTREAM OXYGEN SENSOR 80a410c5 DOWNSTREAM OXYGEN CATALYTIC CONVERTER 80 410 4 TJ BODY 1 2 DOWNSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE BK GROUND HEATER SENSOR GROUND TN WT OXYGEN SENSOR SIGNAL 1 2 3 BR YL 4 80b810e8 r JJmzmea 2 0 4 520 2 201012 110 20 4 5200 2 4 4 Sensors Continued XJ BODY 1 1 UPSTREAM OXYGEN SENSOR CONNECTOR HARN
281. S CONNECTOR USING AN OHMMETER MEASURE THE RESISTANCE OF THE 5 VOLT SUPPLY CKT FIG 2 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN IN THE 5 VOLT SUPPLY CIRCUIT USING AN OHMMETER MEASURE THE 5 VOLT SUPPLY CKT TO GROUND FIG 2 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SHORT TO GROUND IN THE 5 VOLT SUPPLY REPLACE THE POWERTRAIN CONTROL MODULE 0 40 4 MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 391 0 400 4 MOOO mr ocozm4 oz TEST NTC 21A CONTINUED CHECKING OIL PRESSURE SENDING UNIT NOTES 392 TEST NTC 21A CONTINUED CHECKING OIL PRESSURE SENDING UNIT TEST NTC 21A CONTINUED FROM PREVIOUS PAGE Perform Verification TEST VER 2A FOLLOW THE SERVICE MANUAL SECTION 9 0 FOR OIL PRESSURE DIAGNOSIS IS THE OIL PRESSURE WITHIN THE SERVICE MANUAL SPECIFICATIONS REPAIR THE OIL PRESSURE PROBLEM PER THE SERVICE MANUAL 393 gt REPLACE THE OIL PRESSURE SENSOR Check connectors Clean repair as necessary 0 400 4 MOOO mr ocozm oz 0 40 4 MOOO oz TEST 25 CHECKING THE FUEL LEVEL SENSOR Perform TEST NTC 1A Before Proceeding TJ BODY 2B DGANT TO FLS D IGN FUEL PUMP IGNITION SW OUTPUT RELAY
282. S AN OPEN CIRCUIT EXIST REPAIR THE OPEN CIRCUIT DETERMINE IF AN OPEN CIRCUIT EXISTS BETWEEN IAC CONNECTOR 2 DRIVER amp PCM CONNECTOR 2 DRIVER DOES AN OPEN CIRCUIT EXIST REPAIR THE OPEN CIRCUIT DETERMINE IF AN OPEN CIRCUIT EXISTS BETWEEN IAC CONNECTOR 3 DRIVER amp PCM CONNECTOR 3 DRIVER DOES AN OPEN CIRCUIT EXIST REPAIR THE OPEN CIRCUIT DETERMINE IF AN OPEN CIRCUIT EXISTS BETWEEN IAC CONNECTOR 4 DRIVER amp PCM CONNECTOR 4 DRIVER DOES AN OPEN CIRCUIT EXIST REPAIR THE OPEN CIRCUIT Perform Verification TEST VER 2A Check connectors Clean repair as necessary 367 REPLACE THE IDLE AIR CONTROL MOTOR MOOO mr ocozm oz 0 400 4 MOOO oz TEST 1 CHECKING THE ENGINE MECHANICAL Perform TEST NTC 1A Before Proceeding NOTES 368 TEST 1 CHECKING THE ENGINE MECHANICAL Perform TEST NTC 1A Before Proceeding The components and systems that you have checked before this are operating properly Here are additional non monitored components or systems to check that could cause a driveability problem DISTRIBUTOR POSITION must be within specifications ENGINE VACUUM must be at least 13 inches in n
283. SD RELAY CONNECTOR TO GROUND FIG 10R2 IS THE RESISTANCE BELOW 5 0 OHMS gt 5 NS 6A ON THE NEXT PAGE PERFORM TEST NS 6C 3 40 OZ Perform Verification TEST VER 1A Check connectors Clean repair as necessary 459 TEST 6 CONTINUED REPAIRING NO RESPONSE CONDITION BODY POWER DISTRIBUTION CENTER PDC gt 10 OZ FUNCTION 80661109 XJ BODY POWER DISTRIBUTION CENTER AUTO SHUTDOWN RELAY CONNECTOR COLOR FUNCTION RD LG FUSED B DB WT FUSED IGNITION SWITCH OUTPUT DB YL ASD RELAY CONTROL ASD RELAY OUTPUT s0b6f0dt 5 5 5 6 THE PREVIOUS PAGE DISCONNECT THE CONNECTOR FOR EACH OXYGEN SENSOR USING AN OHMMETER MEASURE THE ASD RELAY OUTPUT CIRCUIT FOR RESISTANCE TO GROUND FIG 1 OR 2 CONTINUED REPAIRING NO RESPONSE CONDITION IS THE RESISTANCE ABOVE 5 0 OHMS MEASURE THE ASD RELAY OUTPUT CKT IN EACH 02 SENSOR FOR RESISTANCE TO GND NOTE THE OXYGEN SENSORS MUST REMAIN DISCONNECTED FOR THE REMAINDER OF THE TEST REPLACE THE OXYGEN SENSOR THAT HAS CONTINUNITY TO GROUND REPLACE FUSE DISCONNECT THE IGNITION COIL CONNECTOR MEASURE THE ASD REL
284. SIGNAL CIRCUIT FIG 1 USING THE DRB OBSERVE THE VSS SIGNAL DISPLAY WHILE TAPPING THE OTHER END OF THE JUMPER WIRE TO THE SENSOR GROUND CIRCUIT DOES THE DRB DISPLAY VSS SIGNAL MORE THAN 0 MPH CONTINUE TEST TC 35B ON THE NEXT PAGE REMOVE THE VEHICLE SPEED SENSOR INSPECT THE SPEEDOMETER PINION GEAR IS THE PINION GEAR OK REPAIR AS NECESSARY REPLACE THE VEHICLE SPEED MOOO mr oUuco gt SENSOR Perform Verification TEST VER 2A Check connectors Clean repair as necessary 127 TEST TC 35A CONTINUED REPAIRING NO VEHICLE SPEED SENSOR SIGNAL TJ XJ BODY VEHICLE SPEED SENSOR HARNESS 0 MOOO mr uUuco 1 FUNCTION 5 VOLT SUPPLY BR YL SENSOR GROUND WT OR VEHICLE SPEED SENSOR SIGNAL 80b0d63c TJ XJ BODY VSS CIRCUIT CHECK 5 VOLT SUPPLY SENSOR GROUND POWERTRAIN CONTROL MODULE CONNECTORS COLOR FUNCTION A4 BR YL SENSOR GROUND B27 WT OR VEHICLE SPEED SENSOR SIGNAL B31 VT OR 5 vOLT SUPPLY 80bOd6de TEST TC 35A CONTINUED FROM THE PREVIOS PAGE KEY ON DISCONNECT THE POWERTRAIN CONTROL MODULE zz EST TC 35A CONTINUED REPAIRING NO VEHICLE SPEED SENSOR SIGNAL MEASURE THE RESISTANCE OF THE VEHICLE SPEED SENSOR SIGNAL C
285. SOR TO COOL DOWN KEY ON ENGINE OFF WITH THE DRB MONITOR THE 1 2 02 SENSOR VOLTAGE EST TC 156A REPAIRING 1 2 2 SENSOR SHORTED TO GROUND Perform TEST DTC Before Proceeding IS THE 1 2 02 SENSOR VOLTAGE BELOW 0 16V gt 5 156 NOTE SHORTED LOW CONDITION DUE TO WATER IN THE SENSOR CONNECTOR MAY BE TEMPORARY WIGGLE THE 1 2 02 SENSOR HARNESS AND MONITOR VOLTAGE DID THE 1 2 02 SENSOR VOLTAGE CHANGE WHILE WIGGLING THE HARNESS REPAIR THE HARNESS OR WIRING FOR AN INTERMITTENT SHORT TO GROUND NO REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES THE CONDITION REQUIRED TO SET THIS TROUBLE CODE IS NOT PRESENT AT THIS TIME 0 MOOO mr oUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 269 0 MOOO CC TEST 156 CONTINUED REPAIRING 1 2 02 SENSOR SHORTED TO GROUND TJ BODY POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND UPSTREAM OXYGEN SENSOR SIGNAL ASD RELAY OUTPUT UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR 80b76ec5 SIGNAL XJ BODY POWERTRAIN CONTROL MODULE CONNEC
286. SPEED CONTROL SW SIGNAL RIGHT YL RD 15 12 VOLT SUPPLY WT PK BRAKE SWITCH SENSE bur SOLENOIDS S C VAC SOL CONTROL DB RD LG RD S C BRAKE BRAKE S C VENT SOL CONTROL LAMP SW OUTPUT ell II SWITCH 80b089e0 TJ XJ BODY SPEED CONTROL SWITCH CONNECTOR V COLOR FUNCTION BR YL GROUND RD LG SPEED CONTROL SIGNAL BOab3724 416 TEST 5 Perform TEST SC 1A Before Proceeding START TEST 5 DISCONNECT THE 5 COAST RESUME SWITCH HARNESS CONNECTOR CHECKING THE SPEED CONTROL RESUME SWITCH CONNECT A JUMPER BETWEEN THE S C SW SIGNAL AND GROUND FIG 1 WITH THE DRB READ THE S C SW VOLTAGE DOES THE DRB DISPLAY S C SWITCH IS LESS THAN 1 0 VOLT REPLACE THE SPEED CONTROL SET RESUME SWITCH DISCONNECT JUMPER USING AN OHMMETER MEASURE THE RESISTANCE OF THE GROUND CIRCUIT gt FROM THE 5 COAST RESUME CONNECTOR TO A GOOD GROUND FIG 1 IS RESISTANCE BELOW 5 0 OHMS REPAIR THE OPEN S C SW SIGNAL CIRCUIT TO THE CLOCKSPRING CONNECTOR REPAIR THE OPEN GROUND CIRCUIT TO S C COAST RESUME SWITCH CONNECTOR 1204200 Perform Verific
287. ST TC 236A CONTINUED REPAIRING OIL PRESSURE SENSOR HIGH EXCEEDED USING AN OHMMETER MEASURE THE RESISTANCE OF THE SENSOR GROUND CIRCUIT TO GROUND IS THE RESISTANCE BELOW 5 0 OHMS THE OIL PRESSURE SENSOR GROUND CIRCUIT KEY OFF DISCONNECT THE PCM HARNESS CONNECTOR USING OHMMETER MEASURE THE RESISTANCE OF THE REPLACE THE OIL PRESSURE SENSOR OIL PRESSURE SENSOR SIGNAL CIRCUIT FIG 2 15 5 5 BELOW 5 0 OHMS REPAIR THE OPEN THE OIL PRESSURE SENSOR SIGNAL CIRCUIT 2 REPLACE THE POWERTRAIN CONTROL MODULE 0 MOOO 0 0 70 Perform Verification TEST VER 2A Check connectors Clean repair as necessary 305 lt MA lt lt 120 ezm o o o JMN r e D I OH S 2 TEST SK 1A IDENTIFYING SENTRY KEY IMMOBILIZER SYSTEM Perform TEST DTC Before Proceeding DIAGNOSTIC TROUBLE CODE DTC DISPLAYED DIAGNOSTIC TEST ANTENNA FAILURE COP FAILURE iii EEPROM FAILURE EMS STATUS FAILURE INTERNAL FAULT RAM FAILURE ROLLING CODE FAILURE SERIAL LINK EXTENERAL FAULT SERIAL LINK INTERNAL STACK OVERFLOW FAILURE TRANSPONDER COMMUNICATION FAILURE TRANSPONDER CRC CYCLE REDUNDANCY CHECK FAIL URE TRANSPONDE
288. STANCE BELOW 5 0 OHMS FOR BOTH GROUND CIRCUITS REPAIR THE OPEN GROUND CIRCUIT S THAT DID NOT MEASURE BELOW 5 0 OHMS USING A VOLTMETER MEASURE THE BATTERY SUPPLY CIRCUIT FIG 1 OR 2 IS THE VOLTAGE ABOVE 10 0 VOLTS BATTERY SUPPLY USING VOLTMETER MEASURE THE IGNITION SUPPLY CIRCUIT FIG 1 OR 2 IS THE VOLTAGE ABOVE 10 0 VOLTS REPAIR THE OPEN IGNITION SUPPLY CIRCUIT WAIT 2 MINUTES BEFORE CONTINUING WITH THE IGNITION STILL ON MEASURE BOTH CCD BUS CIRCUITS AT THE SKIM MODULE HARNESS CONNECTOR FIG 1 2 IS THE VOLTAGE BETWEEN 2 3 AND 2 6 FOR BOTH MEASURES REPAIR THE OPEN CCD BUS CIRCUIT 5 TURN IGNITION OFF RECONNECT THE SKIM HARNESS CONNECTOR KEY ON ATTEMPT TO COMMUNICATE WITH THE SKIM MODULE CAN YOU COMMUNICATE WITH THE SKIM MODULE REPLACE THE SKIM MODULE Perform Verification TEST VER 1A Check connectors Clean repair as necessary 309 L TEST COMPLETE lt MA zmo em o o JMN r e D I OH 2 2 vn lt MA lt 120 lt HPN sc E e D I OH S 2 TEST SK 2A REPAIRING PCM STATUS FAI
289. STANCE REPLACE THE DRIVER CIRCUIT gt BELOW 5 0 OHMS gt POWERTRAIN CONTROL BETWEEN PCM amp IAC MODULE 1 REPAIR THE OPEN IDLE AIR CONTROL MOTOR DRIVER CIRCUIT Perform Verification TEST VER 2A Check connectors Clean repair as necessary 103 0 MOOO mr oUco TEST 250 REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS Perform TEST TC 25A Before Proceeding TJ XJ BODY POWERTRAIN CONTROL MODULE BLACK CONNECTOR IAC 3 DRIVER IAC 2 DRIVER IAG 4 DRIVER IAC 1 DRIVER MOOO 22 IDLE AIR CONTROL MOTOR CONNECTOR IAC 1 DRIVER IAC 2 DRIVER IAC 3 DRIVER IAC 4 DRIVER 80689863 POWERTRAIN CONTROL MODULE VE IAC MOTOR DRIVER 4 20 BR WT IAC MOTOR DRIVER 3 E YL BK 8 IAC MOTOR DRIVER 2 GY RD 19 IAC MOTOR DRIVER 1 IDLE AIR CONTROL MOTOR 80b6f0d8 TEST 250 REPAIRING IDLE AIR CONTROL MOTOR CIRCUITS Perform TEST TC 25A Before Proceeding KEY OFF DISCONNECT START TEST THE POWERTRAIN IS ANY TERMINAL REPAIR AS TC 25D CONTROL MODULE m DAMAGED PUSHED NECESSARY X HARNESS CONNECTOR OUT OR MISWIRED MEASURE RESISTANCE OF THE IAC 3 IS THE RESISTANCE REPLACE THE DRIVER CIRCUIT gt BELOW 5 0 OHMS gt POWERTRAIN CONTROL BETWEEN PCM amp IAC MODULE 1 REPAIR THE OPEN
290. SWITCH SENSE AUTO TRANS GROUND MANUAL TRANS STARTER RELAY OUTPUT 10 30 11 85 13 86 14 87 BR 80b6H07 20 XJ BODY POWER DISTRIBUTION CENTER AUTO SHUTDOWN mI RELAY CO em CAV COLOR FUNCTION 2 30 4 85 6 86 RD LG DB WT DB YL FUSED B FUSED IGNITION SWITCH OUTPUT ASD RELAY CONTROL 8 87 RD ASD RELAY OUTPUT XJ BODY FUEL PUMP RELAY XJ BODY STARTER RELAY CONNECTOR 80b6f0df POWER DISTRIBUTION CENTER PDC RELAY SECTION DG BK FUSED BG FUEL PUMP RELAY OUTPUT FUSED IGNITION SWITCH OUTPUT FUEL PUMP RELAY CONTROL 80b6f0e0 POWER DISTRIBUTION CENTER PDC RELAY SECTION FUSED B P N POSITION SWITCH SENSE AUTO TRANSMISSION GROUND MANUAL TRANSMISSION FUSED IGNITION SWITCH OUTPUT STARTER RELAY OUTPUT 80b6f0e1 XJ BODY POWER DISTRIBUTION CENTER RADIATOR FAN RELAY CONNECTOR COLOR FUNCTION 10 30 LG RD FUSED 80 11 86 WT FUSED IGNITION SWITCH OUTPUT 18 85 DB PK RAD FAN RELAY CONTROL 14 87 LB RAD FAN RELAY OUTPUT B b76e94 4 7 Switches TJ XJ BODY TJ BODY TYPICAL VIEW BRAKE BRAKE LAMP P d LAMP SWITCH CONNECTOR SWITCH FUNCTION WT PK BRAKE SWITCH SENSE BK GROUND YL RD
291. T AND SENSOR VOLTAGE m 5 0 LESS 1 0 AN ENGINE GROUND VOLTS 1 MEASURE RESISTANCE DISCONNECT THE PCM OF THE TP SENSOR IS THE RESISTANCE REPLACE THE HARNESS SIGNAL CKT FROM gt BELOW 5 0 OHMS gt POWERTRAIN CONTROL CONNECTORS PCM TO TP SENSOR MODULE CONN FIG 2 REPAIR THE TP SENSOR SIGNAL 35 CIRCUIT FOR AN OPEN Perform Verification TEST VER 2A Check connectors Clean repair as necessary 115 MOOO mr uUuco TEST TC 30A REPAIRING SENSOR VOLTAGE TOO LOW Perform TEST DTC Before Proceeding TJ XJ BODY POWERTRAIN CONTROL ENGINE MODULE TO OTHER COOLANT SENSORS TEMPERATURE SENSOR BR YL SENSOR GROUND TN BK ENGINE COOLANT TEMPERATURE SENSOR SIGNAL MOOO mr uUuco 80b0d638 Name of code ECT Sensor Voltage Too High When monitored With the ignition on and battery voltage greater than 10 4 volts Set condition The engine coolant temperature sensor circuit voltage at the PCM goes below 8 volt for more than seconds Theory of operation The engine coolant temperature sensor is a negative temperature coefficient NTC thermistor type sensor resistance varies inversely with temperature This means at cold temperatures its resistance is high so the voltage signal will be high As coola
292. T FOR HIGH RESISTANCE BETWEEN THE PCM FUSED AND THE BATTERY X 9 40 4 Oz Oz iro Perform Verification TEST VER 3A Check connectors Clean repair as necessary 429 Perform TEST Bef NOTES TEST NS SEL NO START SELECTION MENU ore Proceeding 3 40 OZ 430 TEST NS SEL NO START SELECTION MENU Perform TEST DTC Before Proceeding NOTE For all component locations REFER TO GENERAL INFORMATION section 4 0 in this manual NOTE The battery must be fully charged before performing any test in this manual NOTE If the engine will not crank or cranks but will not run be sure to check the SKIM module for proper communication and trouble codes NOTE If there are any trouble codes present they must be repaired before continuing with the No Start Symptom diagnostics NOTE If the DRB does not power up REFER TO GENERAL INFORMATION section 3 5 1 Below you will find a recommended procedure to correct a No Start Problem by symptom They should be performed in the order that they are listed Qualifying a no start condition Checking the fuel system Checking engine mechanical systems Repairing low fuel pressure Checking the fuel pump Repairing NO RESPONSE CONDITION Engine starts and the DRB displays NO RESPONSE Checking the idle air control motor Repairing a start and stall condition Repairing a no crank condition 431 OAYOMaA 3 40 OZ
293. TE USE THIS TEST ONLY WHEN THERE ARE NO SPEED CONTROL CODES SET USING A DRB ACTUATE THE S C VACUUM SOLENOID IS THE S C VACUUM SOLENOID CLICKING PERFORM TEST TC 1B STOP THE S C VACUUM SOLENOID ACTUATION USING THE DRB ACTUATE THE S C VENT SOLENOID IS THE S C VENT SOLENOID CLICKING PERFORM TEST TC 1B KEY ON WITH THE DRB MONITOR THE SPEED CONTROL SWITCH INPUTS WHILE OBSERVING DISPLAY PRESS THE SPEED CONTROL ON SWITCH DOES THE DRB DISPLAY SPEED CONTROL SWITCH ON PERFORM TEST SC 2A WHILE OBSERVING THE DISPLAY PRESS THE SET SWITCH SEVERAL TIMES DOES THE DRB DISPLAY SET SWITCH PRESSED OR RELEASED REPLACE THE SET SWITCH WHILE OBSERVING THE DISPLAY PRESS THE RESUME SWITCH SEVERAL TIMES DOES THE DRB DISPLAY RESUME SWITCH PRESSED OR RELEASED PERFORM TEST SC 3A WHILE OBSERVING THE DISPLAY PRESS THE CANCEL SWITCH SEVERAL TIMES Perform Verification TEST VER 4A DOES THE DRB DISPLAY CANCEL SWITCH PRESSED OR RELEASED REPLACE THE CANCEL SWITCH PERFORM TEST SC 4A Check connectors Clean repair as necessary 1204200 4
294. TEST VER 2A Check connectors Clean repair as necessary 273 0 MOOO CC TEST 157 CONTINUED REPAIRING INTERMITTENT LOSS OF CMP TJ XJ BODY CRANKSHAFT POWERTRAIN TO TP SENSOR AND POSITION CONTROL MAP SENSOR SENSOR MODULE GY BK As CKP Sensor Signal OR 5 Volt Supply TN YL CMP Sensor Signal CAMSHAFT POSITION SENSOR BR YL Sensor Ground TO OTHER SENSORS 80adeff4 5 157 CONTINUED FROM THE PREVIOUS PAGE AT PCM BACKPROBE CMP SENSOR SIGNAL CKT WITH SCOPE S VOLTAGE MEASUREMENT LEAD EST TC 157A CONTINUED REPAIRING INTERMITTENT LOSS OF CMP OR CKP WHILE OBSERVING THE SCOPE PATTERN WIGGLE CMP CKT FROM SENSOR TO PCM gt WERE ANY SIGNALS MISSING WHEN THE WIGGLE TEST WAS CONDUCTED gt NOTE WHERE WIGGLING THE WIRES CAUSED A MISSING CMP SENSOR SIGNAL OFF AT THE CRANKSHAFT POSITION SENSOR BACKPROBE THE CKP SENSOR SIGNAL CIRCUIT REPAIR CAMSHAFT AND CRANKSHAFT WIRE HARNESS AS NECESSARY WITH THE SCOPE S VOLTAGE MEASUREMENT LEAD START THE ENGINE AND OBSERVE THE CKP SENSOR VOLTAGE PATTERN ON THE SCOPE ARE ANY CRANKSHAFT POSITION SENSOR SIGNALS MISSING CONTINUE TEST TC 157A ON THE KEY OFF DISCONNECT
295. THE CKP SENSOR IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY DISCONNECT THE PCM HARNESS CONNECTOR IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY Perform Verification TEST VER 2A Check connectors Clean repair as necessary 275 PERFORM TEST TC 157D MOOO mr oUco TEST 157 CONTINUED REPAIRING INTERMITTENT LOSS OF CMP Name of code Intermittent Loss of CMP or CKP When Monitored Engine running or cranking Set Condition When the failure counter reaches 96 for 2 consecutive trips Theory of operation A failure counter is incremented whenever the correct number of crank signals is not seen between two cam signals A bad trip is stored when the failure counter reaches 96 Two consecutive bad trips are required to set the fault Possible Causes gt Open or shorted 5 volt supply circuit gt Open sensor ground gt Open or shorted signal circuit gt Excessive crankshaft sensor clearance gt Excessive camshaft sensor clearance gt gt gt gt 0 MOOO mr uUuco Damaged crankshaft sensor rotating component Damaged camshaft sensor rotating component Failed sensor Failed PCM 80a5574d MW BODY CRANKSHAFT POWERTRAIN TP SENSOR AND POSITION CONTROL MAP SENSOR SENSOR MODULE GY BK
296. THE PRESSURE GAUGE FOR 1 MINUTE IS THE FUEL PRESSURE BELOW 10 PSI IF FUEL PUMP AND LINES ARE OK REPLACE LEAKING INJECTOR S AS NECESSARY INSPECT THE AIR FILTER AND INLET DUCTS FOR RESTRICTION S WERE THERE ANY RESTRICTIONS REPAIR OR REPLACE THE AIR INLET SYSTEM AS NECESSARY PERFORM TEST NTC 13A 0 MOOO mr ocozm oz Perform Verification TEST VER 2A Check connectors Clean repair as necessary 359 TEST 10 CHECKING THE OXYGEN SENSOR SWITCHING Perform TEST NTC 10A Before Proceeding NORMAL BLOWN NORMAL WORN LATE VALVE READING HEAD READING RINGS OR TIMING RANGE GASKET RAPID DILUTED OIL VACUUM ATIDLE ATIDLE ACCELERATION RAPID DECELERATION ACCELERATION DECELERATION m RESTRICTED POOR STICKING WORNVALVE WORNVALVE EXHAUST VALVE VALVE GUIDES SPRINGS DROPS SEATING AT IDLE STEADIES AS MORE TOWARD AT IDLE ENGINE ZERO AS SPEED PRONOUNCED ENGINE RPM INCREASES 5 ENGINE INCREASES SPEED INCREASES 0 MOOO mr ocozm oz TJ 1 1 02 POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND UPSTREAM OXYGEN SENSOR SIGNAL ASD RELAY OUTPUT UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR 80676965 SIGNAL TJ 1 202 POWERTRAIN CONTROL MODULE CONNECTORS A4 SENSOR GROUND A25 DOWNSTREAM OXYGEN SENSOR SIGNAL
297. TIC TROUBLE CODES 7 3 3 1 Hard COG sie 7 3 32 Intermittent 7 3 3 3 Reset COUDIGI x eiu ew Oso oe heehee UO CR 7 3 3 4 Handling No Trouble Code 5 7 3 4 USING THE DIRBIME one vto Pro d ERU 7 3 5 ERROR MESSAGES AND BLANK SCREEN 8 45 Does Nor Power UD 8 352 Display IS Not Visible 8 SYSTEM COMPONENT 6 9 4 1 POWERTRAIN CONTROL MODULE 9 A2 CONTROLS amp SOLENOIDS a 11 4 3 DATA LINK CONNECTOR RI erem rem 14 E DEE 14 4 5 sues Bush E acque 19 4 6 19 47 SWITCHES Rer 21 DISCLAIMERS SAFETY 5 23 5 1 DISCLAIMERS 23 5 2 SAFETY AND WARNINGS e su wurde RON RARI E wares 23 5 2 1 Technician Safety 23 5 2 2 Vehicle Preparation Tor
298. TL REPLACE THE MAP SENSOR MOOO mr oUuco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 149 TEST 40 REPAIRING NO CRANK REFERENCE SIGNAL Perform TEST DTC Before Proceeding TJ XJ BODY CRANKSHAFT ie 7 7 TP SENSOR AND POSITION CONTROL MAP SENSOR SENSOR MODULE GY BK A8 CKP Sensor Signal OR 5 Volt Supply TN YL CMP Sensor Signal CAMSHAFT POSITION SENSOR BR YL Sensor Ground 0 MOOO CC TO OTHER SENSORS 80a4eff4 Name of code No Crank Reference Signal at When monitored During engine cranking Set condition No signal from the crank position sensor is present during engine cranking and at least 3 cam position signals have occured Theory of operation The crank position sensor is a hall effect type sensor used to detect the crankshaft speed and position The PCM supplies 5 volts and a ground to power up the sensor The PCM also supplies a 5 volt pull up voltage The sensor signal is created by the slots passing under the sensor When slot is under the sensor the signal is high 5 0V when the metal between the slots is under the sensor the signal is low 03V Probable causes Open or shorted 5 volt supply circuit Open sensor ground Open or shorted signal circuit Excessive clearance between the sensor and flywheel or crankshaft Damaged flyw
299. TLE 1 4 OF THE WAY DOWN AND ATTEMPT TO START ENGINE gt DOES THE ENGINE START AND STAY RUNNING AND THEN STALL WHEN THROTTLE IS RELEASED PERFORM TEST NS 8A DISCONNECT THE IDLE AIR CONTROL MOTOR CONNECTOR WITH DRB ACTUATE THE IDLE AIR CONTROL MOTOR PUT A VOLTMETER MEASURE THE IDLE AIR CONTROL 1 DRIVER CKT EIG 1 DID THE VOLTAGE STAY BELOW 1 0 VOLT PERFORM TEST TC 25B MEASURE THE IDLE AIR CONTROL 42 DRIVER CKT FIG 1 DID THE VOLTAGE STAY BELOW 1 0 VOLT PERFORM TEST TG 250 MEASURE THE IDLE AIR CONTROL 43 DRIVER CKT FIG 1 gt DID THE VOLTAGE STAY BELOW 1 0 VOLT PERFORM TEST TC 25D MEASURE THE IDLE AIR CONTROL 4 DRIVER CKT FIG 1 Perform Verification TEST VER 1A gt DID THE VOLTAGE STAY BELOW 1 0 VOLT PERFORM TEST TC 25E Check connectors Clean repair as necessary 473 CONTINUE TEST NS 7A ON THE NEXT PAGE 3 40 OZ 3 40 OZ EST NS 7A CONTINUED CHECKING THE IDLE AIR CONTROL MOTOR WIRE IDLE AIR HARNESS CONTROL CONNECTION STEPPER MOTOR PINTLE 474 1100102 TEST 5 7 5 5 7 THE PREVIOUS PAGE
300. TOR TRANS RANGE SENSOR HARNESS CONN MEASURE THE RESISTANCE BETWEEN THE P N SWITCH SENSE CIRCUIT AND GROUND FIG 1 OR 2 CONTINUE TEST TC 114A ON THE NEXT PAGE A IS THE RESISTANCE BELOW 5 0 OHMS REPAIR P N SWITCH SENSE CKT FOR A SHORT TO GROUND 22 REPLACE PARK NEUTRAL POSITION SW OR TRANSMISSION RANGE SENSOR 0 MOOO 22 Perform Verification TEST VER 2A Check connectors Clean repair as necessary 209 TEST 114 CONTINUED REPAIRING P N SWITCH STUCK PARK OR GEAR ALL OTHERS POWERTRAIN CONTROL MODULE BLACK CONNECTOR FUNCTION PARK NEUTRAL POSITION SW SENSE XJ 2 51 A6 BR LB PARK NEUTRAL POSITION SW SENSE TJ 2 5L 4 01 PARK NEUTRAL POSITION SWITCH CONNECTOR XJ 2 5L A T CAV 1 WT FUSED IGNITION SWITC4 OUTPUT 2 PARK NEUTRAL POSITION SW SENSE 3 BR LG BAGK UP LAMPS FEED TJ 2 5L AND 4 0L A T AV 1 FUSED IGNITION SWITCH OUTPUT 2 BR LB PARK NEUTRAL POSITION SW SENSE 3 VI BK BACK UP LAMPS FEED 80 7 8 0 MOOO mr uUco 40L POWERTRAIN CONTROL MODULE BLACK CONNECTOR FUNCTION BK WT PARK NEUTRAL POSITION SWITCH SENSE TRANSMISSION ES RANGE SENSOR CONNECTOR 7 BK WT PARK NEUTRAL POSITION SWITCH SENSE 8 BK GROUND 830205735 5 114 CONTINUED
301. TORS SENSOR GROUND UPSTREAM OXYGEN SENSOR SIGNAL ASD RELAY OUTPUT UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR 80b766c4 SIGNAL EST 156 CONTINUED REPAIRING 1 2 02 SENSOR SHORTED TO GROUND CONTINUE TEST 156 FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE 1 2 02 SENSOR IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR OR REPLACE AS NECESSARY KEY ON USING THE DRB READ THE 1 2 02 SENSOR VOLTAGE IS THE VOLTAGE BELOW 0 16 VOLTS REPLACE THE 1 2 02 SENSOR KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS XX IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR OR REPLACE AS NECESSARY USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE 1 2 02 SENSOR SIGNAL gt CIRCUIT FROM THE PCM CONNECTOR TO GROUND FIG 1 2 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE 1 2 O2 SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND MEASURE THE 1 2 O2 SENSOR SIGNAL CIRCUIT TO THE SENSOR GROUND CIRCUIT AT THE 1 2 O2 SENSOE HARNESS CONNECTOR FIG 1 OR 2 gt IS THE RESISTANCE BELOW 5 0 OHMS REPLACE THE POWERTRAIN CONTROL MODULE
302. UAL INSTRUCTIONS EST TC 157C REPAIRING INTERMITTENT LOSS OF CMP OR CKP Perform TEST TC 157A Before Proceeding Perform Verification TEST VER 2A gt IS THE ROTOR D ROTOR AND RIVE SYSTEM gt OK REPAIR THE LOOSE DISTRIBUTOR ROTOR OR ROTOR DRIVE SYSTEM AS NECESSARY Check connectors Clean repair as necessary 281 REPLACE THE CAMSHAFT POSITION SENSOR MOOO 2 TEST TC 157D REPAIRING INTERMITTENT LOSS OF OR Perform TEST TC 157A Before Proceeding TJ XJ BODY 2 5L AND 4 0L ELECTRICAL CONNECTOR 0 MOOO mr oUco f m f 2817 ewe 4 L5 C ETO CRANKSHAFT POSITION SENSOR TEST TC 157D REPAIRING INTERMITTENT LOSS OF OR Perform TEST TC 157A Before Proceeding REMOVE THE START TEST CRANKSHAFT TC 157D POSITION SENSOR FIG 1 INSPECT THE IS THE FLYWHEEL REPAIR AS FLYWHEEL FOR gt DAMAGED NECESSARY DAMAGE REPLACE THE gt CRANKSHAFT POSITION SENSOR Perform Verification TEST VER 2A Check connectors Clean repair as necessary 283 MOOO 2 TEST TC 225A REPAIRING NO CDD BUS MESSAGE FROM THE Perform TEST DTC Before Proceeding TJ BODY INSTRUMENT CLUSTER TO PCM AND OTHER MODULES
303. UND 3 B23 TO OTHER SENSORS 80076161 300 TEST 236 REPAIRING OIL PRESSURE SENSOR HIGH EXCEEDED Perform TEST DTC Before Proceeding KEY ON START TEST TC 23 6A USING THE DRB ERASE CODES CYCLE THE KEY ON AND OFF SEVERAL TIMES DOES THE DRB CONTINUE TEST KEY ON DISPLAY THIS CODE gt 236 ON THE USING THE DRB NEXT PAGE READ CODES 5 USING THE SCHEMATIC CONDITION REQUIRED AS A GUIDE INSPECT WERE ANY PROBLEMS REPAIR AS TO SET THE CODE IS THE WIRING AND FOUND NECESSARY NOT PRESENT CONNECTORS FIG 1 FIG 2 REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL gt TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 2A Check connectors Clean repair as necessary 301 0 MOOO CC M TEST 236 CONTINUED REPAIRING OIL PRESSURE SENSOR HIGH EXCEEDED TJ XJ BODY ENGINE OIL PRESSURE SENSOR CONNECTOR MOOO mr uUuco FUNCTION 5 VOLT SUPPLY TJ 5 VOLT SUPPLY XJ OIL PRESSURE SENSOR SIGNAL SENSOR GROUND 80b8b37t 5 236 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE OIL PRESSURE SENSOR HARNESS CONNECTOR KEY ON USE A VOLTMETER IN THE FOLLOWING STEPS MEASURE THE V
304. US PAGE REMOVE OIL PAN AND INSPECT FOR EXCESSIVE DEBRIS AND BURNT OIL a IS THE OIL BURNT OR DOES THE PAN CONTAIN EXCESSIVE DEBRIS gt REPAIR INTERNAL TRANSMISSION PROBLEM 5 CONDITIONS REQUIRED TO SET THIS CODE ARE NOT PRESENT gt TEST COMPLETE Perform Verification TEST VER 2A Check connectors Clean repair as necessary 243 0 MOOO CC MOOO III CC TEST 149 REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO LOW Perform TEST DTC Before Proceeding TJ BODY XJ BODY POWERTRAIN 2B DGANT TO FLS D IGN FUEL PUMP IGNITION o OUTPUT RELAY QUTPUT SWITCH CONTROL MODULE FUEL PUMP RELAY BR PUMP 85 RELAY CONTROL FUEL LEVEL SENSOR SIGNAL BATTERY C26 BR YL SENSOR GROUND 80b6f0ce DB WT TO Fused Ign IGNITION 6 5V SWITCH DG WT Fuel Pump Relay Output FUEL PUMP RELAY POWERTRAIN CONTROL MODULE BR Fuel Pump Relay Control DBILG Fuel Level Sensor Signal BR YL Sensor Ground 8006044 Name of code Fuel Level Sending Unit Volts Too Low When monitored Ignition on and battery voltage above 10 4 volts Set condition The fuel level sensor signal circuit voltage at the PCM goes below 4 volts for 90 seconds Theory of operation The fuel sending unit prov
305. USING A VOLTMETER MEASURE THE VOLTAGE OF THE BRAKE SWITCH SENSE CIRCUIT AT THE BRAKE SWITCH CONNECTOR FIG 1 OR 2 IS THE VOLTAGE ABOVE 10 0 VOLTS CONTINUE TEST SC 4A ON THE NEXT PAGE CONNECT A JUMPER BETWEEN THE BRAKE SWITCH SENSE AND GROUND IN BRAKE SW CONN FIG 1 OR 2 WITH THE DRB READ THE BRAKE SWITCH INPUT STATUS DOES THE DRB DISPLAY BRAKE SW RELEASED SWITCH gt REPAIR THE OPEN GROUND CIRCUIT 104200 Perform Verification TEST VER 4A Check connectors Clean repair as necessary 419 TEST 4 CONTINUED CHECKING THE BRAKE SWITCH SENSE IJ BODY POWERTRAIN CONTROL MODULE CONNECTORS A4 SENSOR GROUND 8 6 VACUUM SOLENOID CONTROL 3 G VENT SOLENOID 12 VOLT SUPPLY WT PK BRAKE SWITCH SENSE 5 6 SWITCH SIGNAL 0 400 4 BRAKE LAMP SWITCH CONNECTOR 1 BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED B 4 80b6b1cd XJ BODY POWERTRAIN CONTROL MODULE GREY CONNECTOR S C VAC SOL CONTROL S C VENT SOL CONTROL 12 VOLT SUPPLY BRAKE SW SENSE BRAKE LAMP SWITCH CONNECTOR BRAKE SW SENSE GROUND 12 VOLT SUPPLY S C BRAKE SW OUTPUT FUSED B 4 STOP LAMP SW OUTPUT 80b6bicc TEST SC 4A TEST SC 4A CONTI
306. W FUEL PRESSURE Perform TEST NS SEL Before Proceeding INSPECT FUEL LINES FROM FILTER REG TO FUEL RAIL FOR RESTRICTION IS THERE ANY RESTR CTION La REPAIR RESTRICTED FUEL LINES gt REPLACE FUEL PUMP MODULE 3 40 OZ TEST NS 5A CHECKING THE FUEL PUMP Perform TEST NS 2A Before Proceeding TJ BODY POWER DISTRIBUTION CENTER FUEL PUMP RELAY 3 40 OZ FUNCTION FUSED IGNITION SWITCH OUTPUT FUEL PUMP RELAY CONTROL XJ BODY POWER DISTRIBUTION CENTER PDC RELAY SECTION FUEL PUMP RELAY 80b6f0e0 TEST NS 5A CHECKING THE FUEL PUMP Perform TEST NS 2A Before Proceeding START TEST NOTE THE FUEL NS 5A PUMP RELAY STILL ACTUATING TOUCH THE FUEL PUMP RELAY FIG 1 OR 2 IS THE FUEL PUMP RELAY OPERATING DISCONNECT THE FUEL PUMP RELAY XX KEY OFF 6 gt 1 2 USING VOLTMETER MEASURE THE FUEL PUMP RELAY FUSED B CIRCUIT FIG 1 OR 2 PERFORM TEST TC 101A IS THE VOLTAGE ABOVE 10 0 VOLTS REPAIR THE FUEL PUMP RELAY CIRCUIT FOR AN OPEN CONTINUE TEST A NS 5A ON THE NEXT PAGE 3 40 OZ Perform Verification TEST VER 1A Che
307. Y VOLTAGE gt PROBE THE GEN FIELD DRIVER CIRCUIT NOTES DRB STILL ACTUATING FIG 1 DOES THE TEST LIGHT FLASH ON AND OFF gt CONTINUE TEST TC 11A ON THE NEXT PAGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 2 l USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY WITH THE DRB READ CODES NOTE ACTUATOR TEST SHOULD STILL BE RUNNING WIGGLE WIRING HARNESS FROM THE GENERATOR TO PCM DOES THE GENERATOR FIELD NOT SWITCH PROPERLY CODE RETURN REPAIR AS NECESSARY WHERE WIGGLING CAUSED PROBLEM TO APPEAR REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFOMATION ON INTERMITTENT CODES gt TEST COMPLETE 0 MOOO 22 Perform Verification TEST VER 3A Check connectors Clean repair as necessary TEST 11 CONTINUED REPAIRING GENERATOR FIELD SWITCHING PROPERLY GENERATOR FIELD HARNESS CONNECTOR FUNCTION 1 DG OR GENERATOR SOURCE 2 DG GENERATOR FIELD DRIVER POWERTRAIN CONTROL MODULE CONNECTORS 0 MOOO CC 80b6b37b COLOR FUNCTION 1 DG OR GENERATOR SOURCE DG GENERATOR FIELD BK GY
308. Y CONTROL CIRCUIT POWERTRAIN CONTROL MODULE MOOO Perform Verification TEST VER 2A Check connectors Clean repair as necessary 0 MOOO CC 15 Perform TEST DTC Before Proceeding Name code Speed Control Solenoid Circuits When monitored Engine running speed control switch on and battery voltage greater than 10 4 volts Set condition The powertrain control module actuates the vacuum and vent Solenoids but they do not respond Theory of operation When the SET switch is pressed the vehicle must be moving forward at a speed between 35 85 mph with the transmission gear selector in other than park or neutral The PCM locks in a set speed Then the PCM energizes the vacuum solenoid to open the throttle and actuates the vent solenoid to close the throttle These actuations are dependent on power supplied to the servo from the PCM or speed control relay through the brake Switch The system is deactivated by pressing the brake turning the on off Switch off or vehicle speed falling below the minimum Reactivation can be done by repeating the previous steps or pressing resume with the vehicle speed between 35 85 mph Possible causes gt Solenoid control circuit open or shorted gt Vacuum or vent solenoid shorted or open gt Open or shorted speed control power supply circuit POM failu
309. a dealership The MC68HC11D3 and MC68HC11K4 micro computers have memories which are permanently programmed during their manufacture and therefore cannot be reprogrammed The microcomputers communicate over a bus which allows for rapid transmission of high priority messages 72 executes the primary powertrain control strategy transmits fuel and spark requirements to the D3 and K4 communicates with outside devices and processes 14 analog inputs and about half of the one bit inputs and outputs The D3 microcomputer controls fuel injector timing pulses and a small number of one bit inputs and outputs The K4 controls spark timing pulses processes 8 analog inputs and a number of one bit inputs and outputs Other major sections of the PCM design include the power supply input conditioning circuits output driver circuits serial communication interface circuits and a device which controls ignition coil currents 3 2 3 Software Architecture The 68HC16Z2 microcontroller is the main computing unit of the PCM The 68HC11D3 and K4 microcontrollers control fuel and spark respectively They handle the critical timing requirements of their tasks communicating with the Z2 using high level commands The Z2 operating system is the heart of the software and was written expressly for this PCM Every 500 microseconds the Z2 interrupts what it is doing to perform periodic tasks such as updating sensor inputs values and checking for the occurrence of a
310. air as necessary 371 BATTERY TEMP SENSOR TEST PASSED 0 400 4 MOOO mr ocozm oz TEST 17 CHECKING THE EVAPORATIVE EMISSION SYSTEM Perform TEST NTC 1A Before Proceeding BODY POWERTRAIN CONTROL MODULE EVAP SOLENOID PK BK EVAP SOLENOID CONTROL RD LG FUSED IGNITION SWITCH OUTPUT 0 400 4 MOOO mr ocozm oz TO IGNITION SWITCH 80409 9 XJ BODY POWERTRAIN CONTROL MODULE EVAP SOLENOID Evap Solenoid Control WT Fused Ignition Switch Output TO IGNITION SWITCH 15 AMP 8065045 TEST 17 CHECKING THE EVAPORATIVE EMISSION SYSTEM Perform TEST NTC 1A Before Proceeding NOTE CAREFULLY START TEST INSPECT ALL VACUUM 17 HOSES FOR PROPER ROUTING AND FOR PINCHED OR PLUGGED HOSES FROM THE ENGINE TO THE ARE ALL THE VACUUM REPAIR THE VACUUM EVAP SOLENOID TO gt HOSES OK gt 5 5 5 5 NECESSARY START THE ENGINE AND ALLOW IT TO REACH TURN ENGINE OFF NORMAL OPERATING IGN OFF TEMPERATURE 76 C 170 F DISCONNECT THE START THE ENGINE IS THE PURGE PURGE VACUUM HOSE THERE SHOULD BE NO SOLENOID ALLOWING CONTINUE TEST AT THE SOLENOID FLOW THROUGH THE VACUUM THROUGH THE 17 ON THE THAT GOES TO THE SOLENOID FOR 1 TO SOLENOID WITHIN 1 NEXT PAGE CANISTER 2 MINUTES MINUTE
311. al to the amount of oxygen in the exhaust Possible causes Sensor output wire shorted to a power circuit O2 sensor failure Powertrain control module failure Connector terminals gt Connector wires gt Open 2 sensor signal circuit 80 01C8 176 5 62 5 5 62 5 IDLE FOR AT LEAST 5 MINUTES USING THE DRB READ THE 1 1 02 SENSOR VOLTAGE REPAIRING 1 1 02 SENSOR SHORTED TO VOLTAGE Perform TEST DTC Before Proceeding IS THE 1 1 02 SENSOR VOLTAGE ABOVE 1 5 VOLTS CONTINUE TEST 62 ON THE NEXT PAGE WIGGLE THE 1 1 02 SENSOR CONNECTOR AND HARNESS WHILE WIGGLE THE HARNESS WATCH THE DRB DISPLAY DID THE 1 1 02 SENSOR VOLTAGE GO ABOVE 1 5 VOLTS AT ANY TIME REPAIR THE HARNESS OR CONNECTOR THAT HAS THE INTERMITTENT SHORT SHORT TO VOLTAGE AT THIS TIME THE CONDITIONS REQUIRED TO SET THE CODE ARE NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING WERE THERE ANY PROBLEMS FOUND REPAIR AS NECESSARY X REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFOMATION ON INTERMITTENT CODES TEST COMPLETE 0 MOOO CC Perform Verification TEST VER 2A Check connectors Clean repair as
312. as a fully charged battery If it does not false diagnostic codes or error messages may occur 5 2 3 Servicing Sub Assemblies Some components of the powertrain system are intended to be serviced in assembly only Attempting to remove or repair certain system sub components may result in personal injury and or improper system operation Only those components with approved repair and installation procedures in the service manual should be serviced 5 2 4 DRBIII Safety Information WARNING Exceeding the limits of the DRBIII multimeter is dangerous It can expose you to serious or possibly fatal injury Carefully read and understand the cautions and the specification limits Follow the vehicle manufacturer s service specifications at all times e not use the DRB if it has been damaged Do not use the test leads if the insulation is damaged or if metal is exposed e avoid electrical shock do not touch the test leads tips or the circuit being tested e Choose the proper range and function for the measurement Do not try voltage or current measurements that may exceed the rated capacity 23 r JJmzmea 2 0 4 520 02 gt 2 20 4 5200 0 2 Do not exceed the limits shown the table below FUNCTION INPUT LIMIT Volts 0 500 peak volts AC 0 500 volts DC Ohms resistance 0 1 12 megohms Frequency Measured 0 10 kHz Frequency Generated Temperature 58 11009 F 50 600 C
313. as necessary Inspect the engine oil for contamination If it is contaminated change the oil and filter Attempt to start the engine If the engine is unable to start look for any Technical Service Bulletins that may relate to this condition Return to DTC TEST if necessary The repair is now complete 488 TEST VER 2A ROAD TEST VERIFICATION Important Note Inspect the vehicle to ensure that all engine components are connected Reassemble and reconnect all components as necessary Important Note If the Powertrain Control Module has been changed and the correct VIN and mileage have not been programmed a DTC will be set in the ABS Airbag and SKIM modules In addition if the vehicle is equipped with a Sentry Key Immobilizer Module SKIM Secret Key data must be updated to enable starting Refer to GENERAL INFORMATION section 8 0 for programming the Powertrain Control Module and SKIM For ABS and Airbag Systems ACTION 1 Enter the correct VIN and Mileage in PCM 2 Erase ABS and Airbag module codes All trouble codes should be repaired before continuing if not return DTC TEST and follow suggested test Use the following methods depending on the type of test you came from No Trouble Code or Trouble Code e Connect the DRBIII to the data link connector No Trouble Code Repair 1 Check to see if the initial symptom still exists use DRB freeze frame when available to assist 2 If the initial or another
314. ation TEST VER 4A Check connectors Clean repair as necessary 417 Qo 4Q0m TEST SC 4A CHECKING THE BRAKE SWITCH SENSE Perform TEST SC 1A Before Proceeding TJXJ BODY Ruse POWERTRAIN CONTROL MODULE BR YL SENSOR GROUND RD LG SPEED CONTROL SW SIGNAL YL RD 12 VOLT SUPPLY WT PK BRAKE SWITCH SENSE N RD SERVO SOLENOIDS S C VAC SOL CONTROL DB RD LG RD S C BRAKE S C VENT SOL CONTROL SW OUTPUT 1 SWITCH 0 0 290 BK 806099 0 1288 BRAKE LAMP SWITCH CONNECTOR BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT FUSED B BRAKE LAMP SWITCH OUTPUT FIG 1 80b099e1 XJ BODY BRAKE LAMP SWITCH CONNECTOR FUNCTION 1 BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED 80 80004166 418 TEST SC 4A START TEST SC 4A CHECKING THE BRAKE SWITCH SENSE Perform TEST SC 1A Before Proceeding WHILE OBSERVING THE DRB DISPLAY PRESS THE COAST SWITCH SEVERAL TIMES DOES THE DRB DISPLAY COAST SWITCH PRESSED OR RELEASED c REPLACE THE COAST SWITCH YES WHILE OBSERVING THE DRB DISPLAY PRESS THE BRAKE PEDAL SEVERAL TIMES DOES THE DRB DISPLAY BRAKE SWITCH PRESSED OR RELEASED PERFORM TEST 5 1 CONTINUED NO DISCONNECT THE BRAKE SWITCH HARNESS CONNECTOR KEY ON
315. ble cause DISTRIBUTOR POSITION must be within specifications ENGINE VALVE TIMING must be within specifications ENGINE COMPRESSION must be within specifications ENGINE EXHAUST must be free of any restrictions ENGINE PCV SYSTEM must flow freely ENGINE DRIVE SPROCKETS must be properly positioned FUEL must be free of contamination ENGINE SECONDARY IGNITION CHECK must exhibit a normal scope pattern Always look for any Technical Service Bulletins that may relate to this condition Checking Distributor Position With DRBIII Connect the DRB to the Data Link Connector and select the set SYNC from the menu WARNING The following test will be performed with the engine running avoid contact with rotating components Start the engine and observe the DRB display When the distributor is correctly positioned the IN RANGE message should appear along with 0 If the distributor needs to be adjusted loosen the distributor hold down clamp bolt Rotate the distributor until reading is as close to 0 as possible and the IN RANGE message is displayed Tighten the clamp bolt to 22 5 N m 200 in lbs torque NOTE Setting the distributor position does not adjust the ignition timing Ignition timing values are determined by the powertrain control module 479 OAYOMaA 3 40 OZ TEST 9 REPAIRING NO CRANK CONDITION Perform TEST NS SEL Before Proceeding TJ BODY POWER DISTRIBUTION CENTER PDC
316. by the amount of time the PCM grounds the injector control circuit By varying this time more or less fuel is allowed to flow through the injector MOOO CC Possible causes Open or shorted injector driver circuit Open injector Open ASD supply at injector PCM failure Connector terminals Connector wires 80aa4c19 POWERTRAIN POWERTRAIN CONTROL CONTROL MODULE MODULE njector 1 Driver Injector 1 Driver B4 njector 2 Driver Injector 2 Driver 815 njector 3 Driver Injector 3 Driver 85 njector 4 Driver Injector 4 Driver B16 njector 5 Driver 3 3 9 njector 6 Driver 2 0 9 ASD Relay Output ASD Relay Output AUTO lt 1 SHUTDOWN RELAY 4100405 4100406 PDC TEST 21 5 5 21 5 LET IDLE FOR LEAST 20 SECOND REPAIRING INJECTOR CONTROL CIRCUITS Perform TEST DTC Before Proceeding KEY ON ENGINE OFF WITH THE DRB READ TROUBLE CODES DOES THE DRB DISPLAY ANY INJECTOR CONTROL CIRCUIT CODE S gt 5 21 THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS N
317. causes gt Mux switch circuit shorted to power gt Mux switch circuit open gt Open on off switch gt PCM failure 805005a6 SPEED CONTROL SWITCH CONNECTOR 80ab3724 REPAIRING SPEED CONTROL SWITCH ALWAYS HIGH SPEED CLOCK SPRING POWERTRAIN CONTROL MODULE BR YL SENSOR GROUND RD LG SPEED CONTROL SW SIGNAL YL RD 1 12 VOLT SUPPLY WT PK BRAKE SWITCH SENSE SERVO 20 90 SOLENOIDS S C VAC SOL CONTROL DB RD 5 BRAKE SW OUTPUT SWITCH 806099960 POWERTRAIN CONTROL MODULE CONNECTORS CAV COLOR FUNCTION A4 BR YL SENSOR GROUND C4 TWRD S C VACUUM SOL CONTROL C5 LG RD S C VENT SOL CONTROL 29 C11 YL RD 12 VOLT SUPPLY C24 WT PK BRAKE SWITCH SENSE C32 RD LG S C SWITCH SIGNAL SPEED CONTROL SWITCH CONNECTOR COLOR 1 BRAYL 2 FUNCTION GROUND SPEED CONTROL SIGNAL 80b6b36a 194 TEST 86 5 5 86 WITH THE DRB UNDER 1 0 5 READ THE SPEED CONTROL INPUTS MONITORING THE DRB PUSH THE SPEED CONTROL ON OFF SWITCH SEVERAL TIMES LEAVE ON DID THE DRB DISPLAY SPEED CONTROL SWITCH OFF AND ON REPAIRING SPEED CONTROL SWITCH ALWAYS HIGH Perform TEST DTC Before Proceeding PERFORM TEST TC 86B DISCONNECT THE SPEED CONTROL ON OFF SWITCH 2 WAY HARNESS CONNE
318. ck connectors Clean repair as necessary MOOO mr uUuco TEST 10 CONTINUED REPAIRING AUTO SHUTDOWN RELAY CONTROL CIRCUIT TJ BODY AUTO SHUTDOWN RELAY CONNECTOR IN PDC COLOR FUNCTION FUSED B AUTO SHUTDOWN RELAY OUTPUT IGNITION SWITCH OUTPUT AUTO SHUTDOWN RELAY CONTROL POWERTRAIN CONTROL MODULE GREY CONNECTOR coron Function C3 DB YL AUTO SHUTDOWN RELAY CONTROL C12 DG PK AUTO SHUTDOWN RELAY OUTPUT TJ BODY 80b76e90 80b76e97 XJ BODY AUTO SHUTDOWN RELAY CONNECTOR IN PDC RD LG FUSED DB WT FUSED IGNITION SWITCH OUTPUT 6 86 DB YL ASD RELAY CONTROL ASD RELAY OUTPUT POWERTRAIN CONTROL MODULE GREY CONNECTOR FUNCTION DB YL AUTO SHUTDOWN RELAY CONTROL C12 DG OR AUTO SHUTDOWN RELAY OUTPUT XJ BODY 80076 98 TEST 10 CONTINUED REPAIRING AUTO SHUTDOWN RELAY CONTROL CIRCUIT TEST 10 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE AUTO SHUTDOWN ASD RELAY KEY ON USING A VOLTMETER MEASURE THE FUSED IGN SWITCH OUTPUT CKT AT RELAY FIG 1 OR 2 IS THE VOLTAGE ABOVE 10 0 VOLTS REPAIR THE FUSED IGNITION SWITCH OUTPUT CIRCUIT FOR AN OPEN USE AN OHMMETER IN THE FOLLOWING STEP MEASURE
319. ck connectors Clean repair as necessary 451 TEST 5 CONTINUED CHECKING THE FUEL PUMP TJ BODY POWERTRAIN CONTROL MODULE GREY CONNECTORS 4 BR YL SENSOR GROUND C19 BR FUEL PUMP RELAY CONTROL C26 DE LG FUEL LEVEL SENSOR SIGNAL 0 40 4 3 40 OZ FUEL PUMP CONNECTOR FUEL PUMP RELAY OUTPUT FUEL LEVEL SENSOR SIGNAL GAUGE GROUND GAUGE GROUND PUMP 80b76eee POWERTRAIN CONTROL MODULE GREY CONNECTORS A4 BR YL SENSOR GROUND C19 BR FUEL PUMP RELAY CONTROL DB LG FUEL LEVEL SENSOR SIGNAL FUEL PUMP CONNECTOR FUEL PUMP RELAY OUTPUT FUEL LEVEL SENSOR SIGNAL GAUGE GROUND GAUGE GROUND PUMP 80b 76210 5 TEST NS 5A CONTINUED FROM THE PREVIOUS PAGE INSTALL A SUBSTITUTE RELAY OF THE SAME PART NUMBER FOR THE FUEL PUMP RELAY ATTEMPT TO START THE ENGINE CONTINUED CHECKING THE FUEL PUMP DOES THE ENGINE START REPLACE THE FUEL PUMP RELAY REINSTALL THE ORIGINAL FUEL PUMP RELAY DISCONNECT THE FUEL PUMP HARNESS CONNECTOR CAUTION IT IS CRITICAL THAT THE FUEL PUMP CONNECTOR HAS A CLEAN AND TIGHT CONNECTION USING THE DRB ACTUATE THE FUEL SYSTEM USING A VOLTMETER MEASURE THE FUEL PUMP RELAY OUTPUT CIRCUIT FIG 1 OR 2 gt IS THE VOLTAGE ABOVE 10
320. crank position pulse If this pulse is observed a program known as the decision maker is executed and performs high priority tasks such as fuel and spark calculations and RPM processing Low priority tasks SCI and CCD communications are executed during the time between crank pulses The Z2 software is divided into a main oeprating strategy and three separate calibration areas The main strategy contains information specific to the various engines and transmissions supported by this PCM Once installed the information contained in this area is fixed for a given engine and transmission Changes to this data if required can be performed only by computer programming personnel The calibration areas engine and transmission contain information relating to emissions fuel economy and driveability and can be altered directly by calibration personnel 3 2 4 Spark Control The K4 microcomputer controls the generation and timing of spark pulses The spark advance and dwell characteristics are determined by engine speed throttle position MAP coolant temperature barometric air pressure air temperature and vehicle speed 3 2 5 Fuel Control The PCM controls the air fuel ratio of the enigne by varying fuel injector on time Mass air flow is calculated using the speed density method using engine speed manifold absolute pressure and air charge temperature Different fuel calculation strategies are used dependent on the operational state of the en
321. ctronically stored value identification number that is unique to each SKIS The secret key is stored in the SKIM PCM and all ignition key transponders Challenge This is a random number that is generated by the SKIM at each ignition key cycle The secret key and challenge are plugged into an algorithm that produces the encrypted response message The transponder uses the crypto algorithm to receive decode and respond to the message sent by SKIM After responding to the coded message the transponder sends a transponder ID message to the SKIM The SKIM compares the transponder ID to the available valid key codes in SKIM memory 8 key maximum After validating the key the SKIM sends a CCD Bus message called a Seed Request to the powertrain controller then waits for a powertrain controller response If the powertrain controller does not respond the SKIM will send the seed request again After three failed attempts the SKIM will stop sending the seed request and store a trouble code If the powertrain controller sends a seed response the SKIM sends a valid invalid key message to the powertrain controller This is an encrypted message that is generated using the following VIN Vehicle Identification Number Seed This is a random number that is generated by the PCM at each ignition key cycle The VIN and seed are plugged into a rolling code algorithm that encrypts the valid invalid key message The powertrain controller uses the
322. d test the vehicle at speeds over 35 mph and attempt to set the speed control The following items will not allow the speed control to set The last or most recent cause for speed control not to set is indicated by the Denied status Denied Message ON OFF The powertrain control module does not see an ON signal from the switch The vehicle speed as seen by the powertrain control module is not greater than 36 mph The engine rpm is excessively high The brake switch sense circuit is open indicating to the powertrain control module that the brakes are applied The sense circuit is grounded through the brake pedal switch when the brakes are released The park neutral switch sense circuit is malfunctioning indicating the pow ertrain control module that the transmission is not in gear The sense cir cuit is grounded XJ4 SPEED A T or opened TJ XJ 3 SPEED A T through the park neutral switch when the transmission is in park or neu tral RPM SPD The PCM senses excessive engine rpm for a given vehicle speed SOL FLT The powertrain control module senses a servo solenoid circuit trouble code that is maturing or set in memory 423 1204200 ommo TEST CH 1A CHARGING SYSTEM NO CODE TEST Perform TEST DTC Before Proceeding TJ XJ BODY BK GY FUSED POWERTRAIN BATTERY CONTROL MODULE DG OR cos GEN FIELD SOURCE GENERATOR OAYOMA B10 GEN FIELD DRIVER
323. e exceeds a setpoint voltage Possible causes Defects in generator drive belt or adjustment High resistance between battery and generator High resistance between battery and generator ground POM failure TJ XJ BODY BK GY To USED POWERTRAIN BATTERY CONTROL MODULE DG OR GEN FIELD SOURCE RECTIFIER C25 op GENERATOR B10 GEN FIELD DRIVER 80b6f0cd TJ XJ BODY BATTERY TEMPERATURE SENSOR CONNECTOR FUNCTION BR YL SENSOR GROUND 80 127 5 START TEST TC 5A NOTE BATTERY MUST BE FULLY CHARGED REPAIRING CHARGING SYSTEM VOLTAGE TOO LOW Perform TEST DTC Before Proceeding NOTE GENERATOR BELT TENSION AND CONDITION MUST BE CHECKED BEFORE CONTINUING Cat 5 USING THE DRB READ THE TARGET CHARGING VOLTAGE 15 CHARGING VOLTAGE ABOVE 15 1 VOLTS gt 5 TC 5A ON THE NEXT PAGE USING THE DRB READ THE BATTERY TEMP SENSOR TEMPERATURE USING THERMOMETER MEASURE UNDER HOOD TEMPERATURE NEAR THE BATTERY I 3 IS THE TEMPERATURE WITHIN 12 C 10 F OF BATTERY TEMPERATURE CONTINUE TEST TC 5A ON THE NEXT PAGE DISCONNECT THE BATTERY TEMPERATURE SENSOR C
324. e pulse ring in the distributor passing through the sensor When the leading edge of the ring is in the sensor the sensor is high 5 0V when the trailing edge is clear of the sensor the signal is low 0 3V Possible causes Open 5 volt supply circuit Open sensor ground Open or shorted signal circuit Damaged pulse ring Failed sensor Failed PCM 80aa4ba4 TJ XJ BODY CAMSHAFT POSITION SENSOR CONNECTOR FUNCTION 1 TN YL CAMSHAFT POSITION SENSOR SIGNAL 2 BR YL SENSOR GROUND 3 OR 5 VOLT SUPPLY 80afb5cc 1 5 5 1 KEY USING THE DRB ERASE TROUBLE CODES REPAIRING NO CAM SIGNAL AT PCM Perform TEST DTC Before Proceeding ATTEMPT TO START THE ENGINE IF IT DOES NOT START CRANK FOR AT LEAST 15 SECONDS USING THE DRB READ ALL TROUBLE CODES DID THE CODE NO CAM SIGNAL AT PCM RETURN PERFORM TEST TO 10 KEY OFF DISCONNECT THE CAMSHAFT POSITION SENSOR CONNECTOR IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY USING AN OHMMETER MEASURE THE CMP SENSOR GROUND CIRCUIT BETWEEN THE CMP SENSOR HARNESS CONNECTOR AND GROUND 1 IS THE RESISTANCE BELOW 5 0 OHMS gt SENSOR GROUND CIRCUIT TO THE HARNESS SPLICE F
325. e verification of proper operation 2 0 IDENTIFICATION OF SYSTEM The powertrain control module PCM monitors and controls the engine fuel system ignition system and automatic transmission 3 0 SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION 3 1 General Description The Jeep engine and Auto Transmission systems have the latest in technical advances The on board diagnostics incorporated with the PCM controller are intended to assist the field technician in repairing vehicle problems by the quickest means 3 2 JTEC Controller and Operating Modes 3 2 1 Overview The JTEC features a multi processor environment one 16 bit microcomputer two 8 bit microcomputer allowing parallel processing of time critical operations Dedication of one 8 bit processor K4 to spark control and the other 8 bit processor D3 to fuel control allows increases in throughput and reduced software complexity in the 16 bit microcomputer Z2 The result is increased capability in the Z2 to handle overall strategy implementation and other computation intensive processes gt 2 0 4 520 02 201012 10 20 4 5200 12 3 2 2 Hardware Architecture The design of the PCM can be broken up into about eight major sections The main microcontroller a Motorola MC68HC16Z2 is attached to a 256k byte memory device flash memory which is programmed after manufacture of the module This memory can be reprogrammed at the factory or at
326. elay control circuit ground Possible causes gt Relay coil open or shorted Fused ignition switch output circuit open Fuel pump relay control circuit is open or shorted Inoperative circuit driver in powertrain control module Connector terminals Connector wires 3350206 FIG 1 202 TEST TC 101A REPAIRING FUEL PUMP SYSTEM RELAY CONTROL CIRCUIT Perform TEST DTC Before Proceeding START TEST TC 101A KEY ON USING THE DRB ACTUATE THE FUEL PUMP RELAY IS THE FUEL PUMP RELAY CLICKING CONTINUE TEST gt TC 101A ON THE NEXT PAGE THE CONDITION REQUIRED TO SET THE TROUBLE CODE IS NOT PRESENT 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY USING THE DRB ACTUATE THE FUEL PUMP RELAY WIGGLE THE WIRING HARNESS FROM THE RELAY TO THE POWERTRAIN CONTROL MODULE DID THE RELAY CLICKING STOP OR BECOME IRREGULAR WHEN WIGGLING THE WIRES REPAIR CIRCUIT AS NECESSARY WHERE WIGGLING CAUSED THE CLICKING TO STOP OR BECOME IRREGULAR Perform Verification TEST VER 2A Check connectors Clean repair as necessary 203 NO TEST COMPLETE 0 MOOO mr uUuco 0 MOOO 0 70 EST 101 CONTINUED REPAIRING FUEL PUM
327. epair as necessary 117 TEST TC 30A CONTINUED REPAIRING SENSOR VOLTAGE LOW EOD ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR 0 MOOO 22 COLOR FUNCTION TN BK ECT SENSOR SIGNAL BR YL SENSOR GROUND 808580 XJ BODY ENGINE COOLANT TEMP SENSOR CONNECTOR BR YL SENSOR GROUND TN BK ECT SENSOR SIGNAL FIG 2 80b098a7 EST TC 30A CONTINUED REPAIRING ECT SENSOR VOLTAGE LOW TEST 30 CONTINUED FROM THE PREVIOUS PAGE KEY OFF DISCONNECT THE ENGINE COOLANT TEMPERATURE ECT SENSOR CONNECTOR KEY ON USING THE DRB READ THE ECT SENSOR VOLTAGE IS THE ECT SENSOR VOLTAGE ABOVE 4 0 VOLTS YES REPLACE THE ENGINE COOLANT TEMPERATURE SENSOR KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS X USING MEASURE THE SENSOR SIGNAL CIRCUIT TO GROUND FIG 1 OR 2 gt IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND USING AN OHMMETER MEASURE THE RESISTANCE BETWEEN THE ECT SENSOR SIGNAL CIRCUIT AND THE SENSOR GROUND CIRCUIT FIG 1 OR 2 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE ECT SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE SENSOR GROUND CIRCUIT REPLACE THE POWERTRAI
328. erating temperature this is a closed loop mode During certain idle conditions the PCM may enter into a variable idle speed strategy At this time the PCM adjusts engine speed based on the following inputs throttle position battery voltage engine coolant temperature Acceleration Mode This is a closed loop mode The PCM recognizes an increase in throttle position and a decrease in Manifold Vacuum as engine load increases In response the PCM increases the injector pulse width to meet the increased load Deceleration Mode This is a closed loop mode The PCM recognizes a decrease in throttle position and an increase in Manifold Vacuum as engine load decreases In response the PCM decreases the injector pulse width to meet the decreased load Wide Open Throttle Mode This is an open loop mode The throttle position sensor notifies the PCM of a wide open throttle condition The PCM adjusts injector pulse width to supply a predetermined amount of additional fuel 3 2 10 Non Monitored Circuits The PCM does not monitor the following circuits systems and conditions even though they could have malfunctions that result in driveability problems A diagnostic code may not be displayed for the following conditions However problems with these systems may cause a diagnostic code to be displayed for other systems For example a fuel pressure problem will not register a diagnostic code directly but could cause a rich or lean
329. et condition The fuel level sensor signal circuit voltage at the PCM goes above 9 9 volts for 90 seconds Theory of operation The fuel sending unit provides a variable voltage signal to the powertrain control module to indicate fuel level The purpose of this feature is to prevent false setting of misfire and fuel system monitor codes when the vehicle is operating at low fuel levels When the fault is detected by the PCM the PCM will default the fuel gauge to an empty reading This will alert the driver of a malfunction in the fuel level sending unit system Possible causes Open sensor signal circuit Open sensor ground circuit Fuel level sending unit failure Powertrain control module failure Connector wires Connector terminals FIG 1 80677006 248 5 5 150 EST 150 REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO HIGH Perform TEST DTC Before Proceeding KEY ON USING THE DRB READ THE FUEL LEVEL SENDING UNIT VOLTAGE IS THE FUEL LEVEL SENDING UNIT VOLTAGE ABOVE 9 9 VOLTS CONTINUE TEST L TC 150A ON THE NEXT PAGE USE THE SCHEMATIC AS A GUIDE AND WIGGLE THE FUEL PUMP MODULE CONNECTOR amp HARNESS MONITOR THE DRB DISPLAY WAS THERE ANY FUEL LEVEL SENDING UNIT VOLTAGE CHANGE REPAIR THE HARNESS OR CONNECTOR THAT CAUSED THE VOLTAGE CHANGE AT THIS TIME THE C
330. eutral see below 1 ENGINE VALVE TIMING must be within specifications ENGINE COMPRESSION must be within specifications ENGINE EXHAUST SYSTEM must be free of any restrictions ENGINE PCV SYSTEM must flow freely ENGINE DRIVE SPROCKET must be properly positioned TORQUE CONVERTER STALL SPEED must be within specifications auto only POWER BRAKE BOOSTER no internal vacuum leaks FUEL must be free of contamination FUEL INJECTOR plugged or restricted injector control wire not connected to correct injector See sch D NOTE If you came to this test from the oxygen sensor and the rich or lean condition is not caused by one of the first items above replace the powertrain control module and perform TEST VER 2A Road Test Verification Checking Distributor Position With DRBIII Connect the DRB to the data link connector and select SET SYNC from the menu WARNING The following test will be performed with the engine running avoid contact with rotating components Start the engine and observe the DRB display When the distributor is correctly positioned the IN RANGE message should appear along with 0 If the distributor needs to be adjusted loosen the distributor hold down clamp bolt Rotate the distributor until reading is as close to 0 as possible and the IN RANGE message displayed Tighten the clamp bolt to 22 5 N m 200 in Ibs torque NOTE Setting the distributor posi
331. f ww oe _ 58 98 2 jet E La bu LH CREE 29 0 106 KINO OLAY Kass See AWAY NMOG LNHS 1913 OuvWolnv 4 DER 4 n vom 4015 val 09539 V OL 4 ov 5 SE mm y pe HOLMS ESI HOLIMS En 5 LA NOILISOd HMM WN3HLSNMOG zi HOLMIO i Id ek EN 1 A m I gt gt SHOLOIPNI 1304 2 qms er Kg i TE 22890 Ml det 65 79 or se 88 feo 55 25 sy es Zoo Los m m GIS d 2 see 01 er LI BE lt C 32 2 noue 1 d d 1 INGA 4 gla S 1481 1 1 I 55 3 4 1 M as gt med i i Ls 554 i 1681995 08345 e gt Ec HOLOZPNI pos S HOLO3INI TWNOIS HOSN3S ZO Z lt gt ONIUSSIS HOLO3INI 58 1VM0I8 ZO 18 9 HOLOAENI M 139 zig HOLOSPNI 1 vid P HOLOSPNI i HOSN3S 09M38 100 dib NOILISOd LAVHSYNYHO 1 NOILISOd
332. for programming procedure refer to GENERAL INFORMA TION SECTION 8 3 8 3 Programming Ignition Keys to the Sentry Key Immobilizer Module 1 Turn the ignition on transmission in park neutral 2 Use the DRB and select THEFT ALARM SKIM MISCELLANEOUS Select PROGRAM IGNITION KEYS Indicator lamp will begin flashing to indicate that learn mode is in progress 4 Enter secured access mode by entering the vehicle four digit PIN NOTE The PIN must be re entered each time an additional key is learned 5 Insert key into ignition switch and observe ALARM SET lamp Once the key has been learned the ALARM SET lamp will turn off 493 r Jmzmea 2 0 4 520 2 r JJmzmca 20 4 5200 122 NOTE A maximum of eight keys be learned to each SKIM Once a key is learned to it the key cannot be transferred to another vehicle If ignition key programming is unsuccessful the DRB will display one of the following messages Programming Not Attempted The DRB attempts to read the programmed key status and there are no keys programmed into SKIM memory Programming Key Failed Possible Used Key From Wrong Vehicle SKIM is unable to program key due to one of the following faulty ignition key transponder ignition key is programmed to another vehicle 8 Keys Already Learned Programming Not Done SKIM transponder ID memory is full 1 Obtain ignition keys to be programmed from customer
333. g Set condition With the vehicle above 40 mph for over 30 seconds the power steering pressure switch remains open Theory of operation The PCM monitors the power steering pressure switch for a high pressure condition The power steering pressure switch signals the PCM whenever there is a power steering load pressure exceeding 500 psi During this condition the PCM will adjust the RPM to prevent a possible stall The power steering switch is a normally closed switch Possible causes gt power steering switch gt Powertrain control module failure gt Connector terminals gt Connector wires 3220603 TEST 115 REPAIRING POWER STEERING SWITCH FAILURE Perform TEST DTC Before Proceeding START ENGINE WITH DID THE POWER START TEST DRB MONITOR THE STEERING PRESSURE 115 P S SW TURN THE SWITCH CHANGE STEERING WHEEL TO STATE BOTH EXTREMES 5 115 USING THE SCHEMATIC INSPECT WERE ANY PROBLEMS THE WIRING AND FOUND HARNESSES REPAIR AS NECESSARY WITH THE DRB MONITOR THE P S DID THE POWER SWITCH STATE STEERING SWITCH WHILE WIGGLING THE CHANGE STATE HARNESS REPAIR THE HARNESS AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL gt INFORMATION ON INTER
334. gine During crank mode a prime shot fuel pulse is delivered followed by fuel pulses determined by a crank time strategy Cold engine operation is determined via an open loop strategy until O2 sensors have reached operating temperature At this point the strategy enters a closed loop mode where fuel requirements are based upon the state of the O2 sensors engine speed MAP throttle position air temperature battery voltage and coolant temperature Additional factors can influence fuel pulse width Asynchronous acceleration enrichment is technique whereby the duration of injector on time can be increased for injectors already firing providing improved acceleration response The D3 microcomputer controls fuel injector timing in response to high level commands from the Z2 microcomputer Injector timing with respect to engine position is determined by the D3 and is transparent to the 22 3 2 6 Board Diagnostics The PCM has been programmed to monitor many different circuits of the fuel injection system This monitoring is called on board diagnosis Certain criteria or arming conditions must be met for a trouble code to be entered into the PCM memory The criteria may be a range of engine rpm engine temperature and or input voltage to the PCM If a problem is sensed with a monitored circuit and all of the criteria or arming conditions are met a trouble code will be stored in the PCM It is possible that a troub
335. gt PRESSURE ABOVE 54 2 5 SECTION 14 BEFORE CONTINUING USING THE DRB STOP THE FUEL SYSTEM ACTUATION IGNITION KEY OFF TEST INSPECT THE FUEL RELIEVE FUEL LINES FOR KINKED ARE THERE ANY PRESSURE AND REPAIR OR RESTRICTED gt KINKED OR 6 gt AS NECESSARY LINES RESTRICTED LINES SEE GENERAL INFO 9 0 PERFORM SERVICE MANUAL FUEL SYSTEM __ gt PRESSURE CHECK SECTION 14 BEFORE CONTINUING Perform Verification TEST VER 2A Check connectors Clean repair as necessary 351 MOOO mr ocozm oz TEST 6 CHECKING THE COOLANT SENSOR Perform TEST NTC 1A Before Proceeding TJ XJ BODY POWERTRAIN CONTROL ENGINE MODULE TO OTHER COOLANT SENSORS TEMPERATURE SENSOR 0 400 4 MOCO mr ocozm oz BR YL SENSOR GROUND TN BK ENGINE COOLANT TEMPERATURE SENSOR SIGNAL 80609638 TEST 6 CHECKING THE COOLANT SENSOR Perform TEST NTC 1A Before Proceeding START TEST NTC 6A USING THE DRB READ THE ENGINE COOLANT TEMPERATURE SENSOR VALUE VEHICLE 15 82 180 F LLOW ENGINE TO COOL UNTIL 64 C 150 F IS REACHED START THE ENGINE WHILE MONITORING DRB ALLOW ENGINE TO REACH NORMAL OPERATING TEMP 82 C
336. haust The PCM uses this voltage along with that of the upstream oxygen sensor to calculate the efficiency of the catalytic convertor Possible causes Sensor output wire shorted to a power circuit 02 sensor failure Powertrain control module failure Connector terminal wires Open 2 sensor signal circuit 808 409 226 TEST 126 REPAIRING 1 2 02 SENSOR SHORTED TO VOLTAGE Perform TEST DTC Before Proceeding START TEST START ENGINE LET TC 126A IDLE FOR AT LEAST 5 MINUTES USING THE DRB IS THE 1 2 02 READ THE 1 2 02 SENSOR VOLTAGE SENSOR VOLTAGE ABOVE 1 5 VOLTS V AT THIS TIME THE CONDITIONS REQUIRED TO SET THE CODE ARE NOT PRESENT FIG 1 5 126 USING THE SCHEMATIC AS A WERE THERE ANY GUIDE INSPECT THE PROBLEMS FOUND WIRING REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES TEST COMPLETE Perform Verification TEST VER 2A Check connectors Clean repair as necessary 227 0 MOOO mr oUco 0 MOOO CC M TEST 126 CONTINUED REPAIRING 1 2 02 SENSOR SHORTED TO VOLTAGE TJ BODY DOWNSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HE
337. he auto shutdown and fuel pump relays are energized If the PCM does not receive the camshaft and crankshaft signals within approximately one second these relays are de energized 2 PCM energizes all fuel injectors until it determines crankshaft position from the camshaft and crankshaft signals The PCM determines crankshaft position within one engine revolution After the crankshaft position has been determined the PCM energizes the fuel injectors in sequences The PCM adjusts the injector pulse width and synchronizes the fuel injectors by controlling the fuel injectors ground paths Once the auto shutdown and fuel pump relays have been energized the PCM determines the fuel injector pulse width based on the following engine coolant temperature manifold absolute pressure intake air temperature engine revolutions throttle position The determines the spark advance based on the following engine coolant temperature crankshaft position camshaft position intake air temperature manifold absolute pressure throttle position Engine Warm Up Mode This is an open loop mode The PCM adjusts injector pulse width and controls injector synchronization by controlling the fuel injectors ground paths The PCM adjusts ignition timing and engine idle speed The PCM adjusts the idle speed by controlling the idle air control motor Cruise or Idle Mode When the engine is at normal op
338. he engine running Set condition When the PCM tries to regulate the generator field with no result during monitoring Theory of operation The PCM tries to maintain a system voltage between 12 9 volts and 15 0 volts The voltage determined by the PCM as the final goal for the charging system is called control voltage This control voltage is determined from the battery temp sensor ambient sensor The control voltage is compared to the sensed voltage continuously during running If the sensed voltage is less than the control voltage the PCM will supply more ground to the field circuit If the sensed voltage is more than the control voltage PCM will supply less ground to the field circuit Possible causes gt Field driver circuit open or shorted gt Generator internal open or short gt PCM failed 2360602 FIG 2 11 5 5 TC 11A REPAIRING GENERATOR FIELD NOT SWITCHING PROPERLY Perform TEST DTC Before Proceeding DISCONNECT THE GENERATOR FIELD HARNESS CONNECTOR USING THE DRB ACTUATE THE GENERATOR FIELD DRIVER CIRCUIT USING A TEST LIGHT CONNECTED TO GROUND l PROBE THE GENERATOR FIELD SOURCE 1 DOES THE TEST LIGHT ILLUMINATE c REPAIR THE GENERATOR FIELD SOURCE CIRCUIT FOR AN USING A TEST LIGHT CONNECTED TO BATTER
339. heck connectors Clean repair as necessary 113 TEST 27 CONTINUED REPAIRING THROTTLE POSITION SENSOR VOLTAGE HIGH TJ XJ BODY THROTTLE POSITION SENSOR CONNECTOR 0 MOOO CC SENSOR GROUND TP SENSOR SIGNAL 5 VOLT SUPPLY 80061067 TJ XJ BODY POWERTRAIN CONTROL MODULE BLACK CONNECTOR A4 BR YL SENSOR GROUND A17 OR 5 VOLT SUPPLY A23 OR DB THROTTLE POSITION SENSOR SIGNAL THROTTLE POSITION SENSOR CONNECTOR COLOR FUNCTION 1 BR YL SENSOR GROUND 2 0868 TP SENSOR SIGNAL 3 OR 5 VOLT SUPPLY 80b098a6 TEST 27 CONTINUED REPAIRING THROTTLE POSITION SENSOR VOLTAGE HIGH TEST TC 27A KEY OFF CONTINUED FROM DISCONNECT THE THE PREVIOUS THROTTLE POSITION PAGE TP SENSOR MEASURE THE TP REPAIR THE TP SENSOR KEY ON USE A SENSOR SIGNAL IS THE VOLTAGE 5 SIGNAL CIRCUIT FOR VOLTMETER IN THE CIRCUIT VOLTAGE ABOVE 5 5 VOLTS gt SHORT TO VOLTAGE IF FOLLOWING STEP FIG 1 OK REPLACE PCM CONNECT A JUMPER DOES THE TP SENSOR WIRE BETWEEN THE TP VOLTAGE DROP FROM REPLACE THE SENSOR SIGNAL CKT gt 5 0 TO LESS THAN gt THROTTLE POSITION AND SENSOR GND CKT 1 0 VOLTS SENSOR FIG 1 MOVE THE JUMPER WIRE DOES THE TP SENSOR REPAIR THE TP BETWEEN THE SENSOR OBSERVE THE TP VOLTAGE DROP FROM SENSOR GROUND SIGNAL CIRCUI
340. heel Failed sensor Failed PCM Shorted VSS 5 volt supply circuit 80aa4bd CRANKSHAFT POSITION SENSOR CONNECTOR CAV COLOR FUNCTION CRANKSHAFT POSITION SENSOR SIGNAL SENSOR GROUND 5 VOLT SUPPLY 80509956 150 5 40 5 5 40 KEY USING THE DRB ERASE TROUBLE CODES REPAIRING NO CRANK REFERENCE SIGNAL AT PCM Perform TEST DTC Before Proceeding ATTEMPT TO START THE ENGINE IF IT DOES NOT START CRANK FOR AT LEAST 15 SECONDS USING THE DRB READ ALL TROUBLE CODES DID THE CODE NO CRANK SIGNAL AT PCM RETURN PERFORM TEST 40 DISCONNECT THE CRANKSHAFT POSITION SENSOR CONNECTOR IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR AS NECESSARY USING AN OHMMETER MEASURE THE CKP SENSOR GROUND CIRCUIT BETWEEN THE CKP SENSOR HARNESS CONNECTOR AND GROUND 1 IS THE RESISTANCE BELOW 5 0 OHMS REPAIR THE CKP SENSOR GROUND CIRCUIT TO THE HARNESS SPLICE FOR AN OPEN KEY ON USING A VOLTMETER MEASURE THE 5 VOLT SUPPLY CIRCUIT AT THE CKP SENSOR HARNESS CONNECTOR FIG 1 IS THE VOLTAGE ABOVE 4 0 VOLTS REPAIR THE 5 VOLT SUPPLY CIRCUIT FOR AN OPEN CONNECT ONE END OF A JUM
341. ic manual with the DRB read transmission DTC s For an ENGINE IS COLD TOO LONG trouble code the engine does not warm 176 while driving for at least 20 minutes after a start See the service manual for cooling system repair Thermostat For an INTERNAL CONTROLLER FAILURE replace the Powertrain control module and perform Verification TEST VER 2A For a NO CCD PCI BUS MESSAGE FROM TOM trouble code use the appropriate trans diagnostic manual for testing and repair For a PCM FAILURE SPI COMMUNICATIONS trouble code replace the Powertrain control module and perform Verification TEST VER 2A MOOO mr oUuco TEST TC 1A REPAIRING SIGNAL Perform TEST DTC Before Proceeding CRANKSHAFT POWERTRAIN TO TP SENSOR AND POSITION CONTROL MAP SENSOR SENSOR MODULE GY BK A8 CKP Sensor Signal OR 5 Volt Supply TN YL CMP Sensor Signal CAMSHAFT POSITION SENSOR BR YL Sensor Ground MOOO CC OTHER SENSORS 80a4eff4 Name of Code No Cam Signal at PCM When monitored Ignition ON Set condition If 96 crank signals are counted and no signal from the cam position sensor is present the code will set Theory of operation The cam position sensor is a hall effect type sensor used to detect the camshaft position The PCM supplies 5 volts and a ground to power up the sensor The PCM also supplies a 5 volt pull up voltage The sensor signal is created by th
342. ication TEST VER 2A Check connectors Clean repair as necessary 265 0 MOOO CC TEST 155 CONTINUED REPAIRING 1 1 02 SENSOR SHORTED GROUND TJ BODY POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND UPSTREAM OXYGEN SENSOR SIGNAL ASD RELAY OUTPUT UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR 80b76ec5 SIGNAL XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND UPSTREAM OXYGEN SENSOR SIGNAL ASD RELAY OUTPUT UPSTREAM OXYGEN SENSOR CONNECTOR HARNESS SIDE ASD RELAY OUTPUT GROUND HEATER SENSOR GROUND OXYGEN SENSOR 80b766c4 SIGNAL EST 155 CONTINUED REPAIRING 1 1 02 SENSOR SHORTED GROUND 5 155 THE PREVIOUS PAGE DISCONNECT THE 1 1 O2 SENSOR XX IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR OR REPLACE AS NECESSARY WITH THE DRB READ THE 1 1 02 SENSOR VOLTAGE IS THE VOLTAGE BELOW 0 16 VOLTS REPLACE THE 1 1 02 SENSOR KEY OFF DISCONNECT THE PCM HARNESS CONNECTORS XX IS ANY TERMINAL CORRODED DAMAGED PUSHED OUT OR MISWIRED REPAIR OR REPLACE AS NECESSARY USE AN OHMMETER IN THE FOLLOWING STEP MEASURE THE 1 1 0
343. ided by PCM Possible causes gt Sensor signal circuit open gt Throttle position sensor failure Sensor ground circuit open 80aadb9c FIG 1 TEST 27 5 5 27 REPAIRING THROTTLE POSITION SENSOR VOLTAGE HIGH Perform TEST DTC Before Proceeding USING THE DRB READ THE THROTTLE POSITION SENSOR VOLTAGE IS THE THROTTLE POSITION SENSOR VOLTAGE ABOVE 4 5 VOLTS y CONTINUE TEST TC 27A ON THE NEXT PAGE OBSERVING THE DRB SLOWLY OPEN AND CLOSE THE THROTTLE IS THE VOLTAGE CHANGE SMOOTH REPLACE THE THROTTLE POSITION SENSOR WIGGLE THROTTLE POSITON SENSOR CONNECTORS AND WIRING HARNESS MONITOR THE DRB DISPLAY WAS THERE ANY CHANGE IN THROTTLE POSITION SENSOR VOLTAGE WHEN WIGGLED gt REPAIR THE HARNESS OR CONNECTOR THAT CAUSED THE VOLTAGE CHANGE NO AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES TEST COMPLETE 0 MOOO mr oco Perform Verification TEST VER 2A C
344. ides a variable voltage signal to the powertrain control module to indicate fuel level The purpose of this feature is to prevent false setting of misfire and fuel system monitor codes when the vehicle is operating at low fuel levels When the fault is detected by the PCM the PCM will default the fuel gauge to an empty reading This will alert the driver of a malfunction in the fuel level sending unit system Possible causes Sensor signal circuit shorted to ground Fuel pump module failure Powertrain control module failure Connector wires Connector terminals 244 5 5 149 EST TC 149A REPAIRING FUEL LEVEL SENDING UNIT VOLTS TOO LOW Perform TEST DTC Before Proceeding KEY ON USING THE DRB READ THE FUEL LEVEL SENDING UNIT VOLTAGE IS THE FUEL LEVEL SENDING UNIT VOLTAGE BELOW 0 4 VOLT CONTINUE TEST gt TC 149A ON THE NEXT PAGE USING THE SCHEMATIC WIGGLE THE FUEL PUMP MODULE CONNECTOR amp HARNESS MONITOR THE DRB DISPLAY gt WAS THERE ANY FUEL LEVEL SENDING UNIT SENSOR VOLTAGE CHANGE REPAIR THE HARNESS OR CONNECTOR THAT CAUSED THE VOLTAGE CHANGE AT THIS TIME THE CONDITION REQUIRED SET THE CODE 5 NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND
345. ing for 2 2 seconds Theory of operation This sensor measures manifold absolute pressure and ambient barometric pressure within the manifold It provides a 0 to 5 volt signal to PCM The MAP sensor puts out a low voltage signal 0 5 to 1 8 volts at idle when the manifcld vacuum is high and a higher voltage signal 3 9 to 4 8 volts at deep throttle when the manifold vacuum is low The MAP receives a 5 volt supply from PCM Voltage may vary from 4 8 to 5 1 volts The sensor ground is provided by PCM Possible causes Signal circuit open Sensor open internally gt Sensor ground circuit Sensor signal circuit shorted to voltage gt Failed PCM 80aa0f83 TEST 37 REPAIRING MAP SENSOR VOLTAGE TOO HIGH Perform TEST DTC Before Proceeding START TEST TC 37A START THE ENGINE USING THE DRB IS THE MAP SENSOR CONTINUE TEST READ THE MAP VOLTAGE ABOVE 4 6 gt TC 37A THE SENSOR VOLTAGE VOLTS NEXT PAGE REPAIR THE HARNESS WIGGLE MAP SENSOR OBSERVE THE DRB WAS THE VOLTAGE OR CONNECTOR THAT CONNECTOR amp DISPLAY I ABOVE 4 6 VOLTS CAUSED THE VOLTAGE HARNESS WHEN WIGGLED CHANGE AT THIS TIME THE USING THE CONDITION REQUIRED SCHEMATIC AS A WERE ANY PROBLEMS REPAIR AS TO SET THE CODE IS 3 GUIDE INSPECT THE FOUND NECESSARY NOT PRESENT HARNESS AND FIG 1 CONNECTORS
346. ition coil is supplied 12 volts from ASD relay The PCM controls the individual primary circuits which firesthe individual coils The amount of dwelltime is based on crankshaft speed and camshaft position Possible causes gt Open or shorted ignition coil driver circuit gt Open ignition coil primary gt Open ASD output circuit gt Failed PCM 3470203 156 TEST 5 5 4 DISCONNECT THE COIL WIRE AT THE DISTRIBUTOR CONNECT THE CABLE TO A SPARK TESTER FIG 1 CONNECT SPARK TESTER TO GROUND REPAIRING IGNITION COIL 1 PRIMARY CIRCUIT Perform TEST DTC Before Proceeding KEY ON ENGINE OFF USING THE DRB ACTUATE IGNITION COIL gt IS THERE STRONG STEADY SPARK CONTINUE TEST TC 43A ON THE NEXT PAGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 2 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS gt WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY WIGGLE WIRING HARNESS FROM THE IGNITION COIL TO THE POWERTRAIN CONTROL MODULE gt DOES THE SPARK BECOME ERRATIC OR STOP gt REPAIR AS NECESSARY WHERE WIGGLING CAUSED PROBLEM TO APPEAR REFER TO GENER
347. l Switch Always High When monitored With the ignition key on Set condition open condition is detected in the speed control on off switch circuit Theory of operation This circuit is monitored continuously by the PCM whenever the ignition is turned on The trouble code sets if the voltage in this circuit is above 4 7 volts for more than 1 second Possible causes Mux switch circuit shorted to power Mux switch circuit open gt Open on off switch gt failure 805005 6 198 TEST 86 REPAIRING SPEED CONTROL SWITCH ALWAYS HIGH Perform TEST TC 86A Before Proceeding AT THIS TIME THE START TEST CONDITION REQUIRED 86 SET THIS TROUBLE CODE IS NOT PRESENT FIG 1 WITH THE DRB WATCH WAS VOLTAGE ABOVE REPAIR THE WIRING SWITCH VOLTAGE WHILE 4 9 VOLTS AT ANY AT THE POINT WHERE WIGGLING WIRING PCM TIME WHILE gt VOLTAGE FLUCTUATES TO SPEED CONTROL WIGGLING WHEN HARNESS IS ON OFF SWITCH WIGGLED PROBLEM DOES NOT E EXIST AT THIS TIME Perform Verification TEST VER 4A Check connectors Clean repair as necessary 199 Qo 0m MOOO mr uUuco MOOO 22 TEST 87 Perform TEST DTC Before Proceeding Name of code Speed Control Switches When monitored With the ignition key on and battery voltage greater than 10 4 volts Set condition When switch voltage is less
348. le code for a monitored circuit may not be entered into the PCM memory even though a malfunction has occurred This may happen because one of the trouble code criteria arming conditions has not been met The PCM compares input signal voltages from each input device with specifications the established high and low limits of the range that are programmed into it for that device If the input voltage is not within specifications and other trouble code criteria arming conditions are met a trouble code will be stored in the PCM memory 3 27 Transmission Control 4 0L XJ Body Only Control of the transmission on this vehicle is done by a separate Transmission Control Module TCM The TCM is also called an AW4 TCM Diagnostics for this TCM are found in another diagnostic manual called the AW4 Powertrain Diagnostic Manual 3 2 8 Other Controls Cruise Control The PCM controls vehicle speed by operation of the speed control servo vacuum and vent solenoids Energizing the vacuum solenoid applies vacuum to the servo to increase throttle position Operation of the vent solenoid slowly releases the vacuum allowing throttle position to decrease A special dump solenoid allows immediate release of throttle position caused by braking cruise control turned off or ignition key off Fuel Vapor Recovery System Duty Cycle Purge Control Duty Cycle Purge is a system that feeds fuel gases from the purge canister and gasoline tank into the throttle body
349. le codes displayed refer to one of the following For SKIS problems For Driveability problems For No Start problems For Speed Control problems For Charging problems NOTE The decimal test numbers for these trouble codes were derived from the hexadecimal codes as set in the PCM Therefore some test numbers will be missing because all codes are not applicable to the vehicles covered in this manual gl ECH a 100L DESCRIPTION CLUTCH RELAY CIRCUIT AISIN AW4 TRANS TCM DTC PRESENT AUTO SHUTDOWN RELAY CONTROL CIRCUIT BATTERY TEMP SENSOR VOLTAGE TOO HIGH BATTERY TEMP SENSOR VOLTAGE TOO LOW CHARGING SYSTEM VOLTAGE TOO HIGH CHARGING SYSTEM VOLTAGE TOO LOW 1 2 02S VOLTS SHORTED TO GND 1 2 02S SHORTED TO VOLTAGE ECT SENSOR VOLTAGE TOO HIGH ECT SENSOR VOLTAGE TOO LOW ENGINE IS COLD TOO LONG EVAP PURGE SOLENOID CIRCUIT FUEL LEVEL SENDING UNIT NO CHANGE OVER TIME FUEL LEVEL SENDING UNIT VOLTS TOO HIGH FUEL LEVEL SENDING UNIT VOLTS TOO LOW FUEL PUMP RELAY CONTROL CIRCUIT FUEL SYSTEM LEAN 1 1 LEAN FUEL SYSTEM RICH 1 1 RICH GENERATOR FIELD NOT SWITCHING PROPERLY IDLE AIR CONTROL MOTOR CIRCUIT IGNITION COIL 1 PRIMARY CIRCUIT INJECTOR 1 CONTROL CIRCUIT INJECTOR 2 CONTROL CIRCUIT INJECTOR 3 CONTROL CIRCUIT INJECTOR 4 CONTROL CIRCUIT INJECTOR 5 CONTROL CIRCUIT INJECTOR 6 CONTROL CIRCUIT 5 CONTINUED CHECKING THE SYSTEM FOR DIAGNOSTIC TROUBLE CODES TROUBLE CODE DESCRIPTION
350. led transponder gt Failed SKIM 80b5cc74 334 XJ BODY SENTRY KEY IMMOBILIZER MODULE REPAIRING TRANSPONDER RESPONSE MISMATCH ANTENNA PDC 4 10 AMP Fused WT BK Fused Ign Switch Output Run Start WT BK CCD BUS VT BR CCD BUS BK LG Ground TRANSPONDER PDC JUNCTION BLOCK 10 AMP 6 JUNCTION BLOCK TO OTHER MODULES BK LG Ground TRANSPONDER MOLDED CAP REMOVED 8066092 80666145 TEST SK 8A REPAIRING TRANSPONDER RESPONSE MISMATCH Perform TEST SK 1A Before Proceeding START TEST SK 8A TURN IGNITION OFF USING THE DRB DOES THE DRB CONTINUE TEST WAIT 10 SECONDS READ CODES gt DISPLAY THIS CODE gt SK 8A ON THE TURN IGNITION ON NEXT PAGE 5 USING THE CONDITION REQUIRED SCHEMATIC AS A WERE ANY PROBLEMS REPAIR AS SET THE CODE IS gt GUIDE INSPECT THE FOUND NECESSARY NOT PRESENT WIRING AND 1 CONNECTORS REFER GENERAL INFORMATION 3 3 2 FOR ADDITIONAL TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 1A Check connectors Clean repair as necessary 335 lt MA lt 120 lt mN r uozzz TEST 5 CONTINUED REPAIRING TRANSPONDER RESPONSE MISMATCH L
351. lever position switch previously called park neutral switch 498 025 0258 poor fuel economy rough unstable erratic idle stalling start amp stall SKIS surge TPS VSS oxygen sensor left oxygen sensor when there are two sensors right oxygen sensor powertrain control module positive crankshaft ventilation There is significantly less fuel mileage than other vehicles of the same design and configuration The engine runs unevenly at idle and causes the engine to shake if it is severe enough The engine idle rpm may vary called hunting This condition may cause stalling if it is severe enough The engine starts but immediately dies Sentry Key Immobilizer System engine rpm fluctuation without corresponding change in throttle position sensor throttle position sensor vehicle speed sensor 499 gt gt 2 5 Ouizulc 2LC0CCC lt L 0 gt
352. not complete Bring the vehicle speed back up to 25 mph Depress the RESUME ACCEL switch If the speed control did not resume the previously set speed the repair is not complete Hold down the SET switch If the vehicle did not decelerate the repair is not complete Ensure the vehicle speed is greater than 30 mph and release the SET switch If the vehicle did not adjust and set a new vehicle speed the repair is not complete Depress and release the cancel switch If the speed control did not disengage the repair is not complete 12 Bring the vehicle back up to 35 mph and engage speed control 13 Turn the ON OFF switch to the OFF position If the speed control did not disengage the repair is not complete If the vehicle successfully passed all of the previous tests the speed control system is now functioning as designed The repair is now complete Check for Technical Service Bulletins that pertain to speed control problem and then if necessary return to DTC TEST 492 8 0 MAINTENANCE AND SERVICE INFORMATION 8 1 Programming the Powertrain Control Module The SKIS Secret Key is I D code that is unique to each SKIM This code is programmed and stored in the SKIM engine controller and transponder chip ignition keys When replacing the PCM it is necessary to program the secret key into the new PCM using the DRB Perform the following steps to program the secret key into the engine controller 1 T
353. nt temperature increases resistance decreases and the voltage will be low This allows the sensor to provide an analog voltage signal 0 to 5 volt to the PCM Possible causes Sensor signal shorted to ground Sensor internally shorted POM failure gt Connector terminals Connector wires 80aa4c21 5 30 5 5 30 REPAIRING ECT SENSOR VOLTAGE LOW Perform TEST DTC Before Proceeding KEY ON USING THE DRB READ THE ENGINE COOLANT TEMPERATURE ECT SENSOR VOLTAGE gt IS THE ECT SENSOR VOLTAGE BELOW 0 5 VOLTS 5 30 WIGGLE THE SENSOR CONNECTOR AND WIRING HARNESS OBSERVE THE DRB DISPLAY DID THE ECT SENSOR VOLTAGE READING CHANGE I REPAIR THE HARNESS OR CONNECTOR THAT CAUSED THE VOLTAGE CHANGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES gt TEST COMPLETE 0 MOOO mr oUucom Perform Verification TEST VER 2A Check connectors Clean r
354. o not light or no sound is emitted at start up check for loose cable connections or a bad cable Check the vehicle battery voltage data link connector cavity 16 A minimum of 11 volts is required to adequately power the DRB If all connections are proper between the DRB and the vehicle or other devices and the vehicle battery is fully charged an inoperative DRB may be the result of faulty cable or vehicle wiring For a blank screen refer to the appropriate body diagnostics manual 3 5 2 Display Is Not Visible Low temperatures will affect the visibility of the display Adjust the contrast to compensate for this condition DISPLAY _ LENS ENTER KEYS FUNCTION z LEDs ARROW KEYS j with YES key KEYPAD BACK LIGHTING with YES key SHIFT KEY LED 2460403 4 0 SYSTEM COMPONENT LOCATIONS 4 1 Powertrain Control Module TJ BODY 4 Dm POWERTRAIN CONTROL MODULE CONNECTORS CONTROL MODULE PCM gt lt BATTERY 17 80a53495 C GREY 80 07547 CKT COLOR FUNCTION CAV CKT COLOR FUNCTION A2 F12 DB Fused Ignition Switch Output 811 T23 OR LG TCC Solenoid Control 4 167 BR YL Sensor Ground ONLY 6 T41 BR LB P N Position Switch Sense B12 K16 LG BK Injector 6 Driver A7 K19 GY Ignition Coil Driver B15 K12 TN Injector 2 Driver 24 Crank Position Sensor Signal B16 K1
355. odule gt Engine parts tolerance gt Injectors stuck open gt MAP sensor gt O2 sensor upstream Fuel pressure regu ator Wiring harness connectors 80660077 218 TEST 118 REPAIRING FUEL SYSTEM RICH 1 1 RICH Perform TEST DTC Before Proceeding NOTE REPAIR ALL ARE THERE ANY PERFORM THE START TEST OTHER O2 SENSOR OTHER TROUBLE DTC TEST OR 118 RELATED TROUBLE gt CODES OR 5 5 gt T S B S THAT CODES AND T S B S THAT APPLY APPLY BEFORE PROCEEDING NOTE REFER TO FIGURE 1 PERFORM O2 HEATER DID TEST TC 103A REPAIR AS FOR POSSIBLE TEST TC 103A PASS NECESSARY TROUBLE CODE CAUSES PERFORM DID TEST NTC 5A REPAIR AS FUEL DELIVERY TEST NECESSARY NTC 5A PASS KEY ON ENGINE IS THE LONG TERM THE CONDITION OFF READ THE ADAPTIVE MEMORY REQUIRED TO SET THIS 1 1 O2 SENSOR LONG BETWEEN TROUBLE CODE IS NO TERM ADAPTIVE 18 TO 25 LONGER PRESENT MEMORY VALUE TEST COMPLETE PERFORM TEST TC 118B Perform Verification TEST VER 2A Check connectors Clean repair as necessary 219 MOOO III CC TEST 118 REPAIRING FUEL SYSTEM RICH 1 1 RICH Perform TEST TC 118A Before Proceeding BODY POWERTRAIN CONTROL MODULE Downstream Oxygen Sensor Signal DOWNSTREAM OXYGEN SENSOR
356. open or shorted Fused ignition switch output circuit open Auto shutdown relay control circuit open or shorted Inoperative circuit driver in PCM PCM Failure Connector terminals gt gt gt gt 80afb5d2 160 44 5 5 44 21 REPAIRING ASD RELAY OUTPUT VOLTAGE PCM Perform TEST DTC Before Proceeding IS A TROUBLE CODE ALSO SET FOR AUTO SHUTDOWN RELAY CONTROL CIRCUIT DOES THE ENGINE START PERFORM TEST TC 10A CONTINUE TEST TC 44A ON THE NEXT PAGE THE CONDITION REQUIRED TO SET THE TROUBLE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY ERASE FAULT CODES START ENGINE AND LET IDLE WIGGLE WIRING HARNESS FROM ASD RELAY TO THE PCM RE CHECK FAULT CODES DID WIGGLING CAUSE THE FAULT CODE TO APPEAR gt REPAIR AS NECESSARY WHERE WIGGLING CAUSED THE VOLTAGE TO VARY TEST COMPLETE 0 MOOO CC Perform Verification TEST VER 2A Check connectors Clean repair as necessary 161 MOOO CC TEST TC 44A CONTINUED REPAIRING ASD RELAY OUTPUT VOLTAGE TJ BODY AUTO SHUTDOWN RELAY CONN
357. operly unless the Driveability problem actually happens while the vehicle is being tested Review of the appropriate General Information sections is essential before attempting to diagnose any symptom Return to No Trouble Code Menu if driveability problem still exists or perform No Trouble Code Complete Test No Trouble Code Tests NTC 20A through NTC 27A are intended to be performed according to the component or system malfunction NO TROUBLE CODE MENU CHECKING SECONDARY IGNITION AND TIMING CHECKING THE PCM POWER AND GROUND CIRCUITS CHECKING THE ENGINE VACUUM CHECKING THE FUEL DELIVERY CHECKING THE COOLANT SENSOR CHECKING THE THROTTLE POSITION SENSOR CHECKING THE MAP SENSOR CHECKING THE OXYGEN SENSOR SWITCHING CHECKING THE OXYGEN SENSOR HEATER CHECKING THE IDLE AIR CONTROL MOTOR CHECKING ENGINE MECHANICAL NTC 13A CHECKING THE BATTERY TEMP SENSOR NTC 15A CHECKING THE EVAPORATIVE EMISSION SYSTEM NTC 17A CHECKING THE INTAKE AIR TEMP SENSOR NTC 19A CHECKING THE PARK NEUTRAL POSITION SWITCH NTC 20A CHECKING THE OIL PRESSURE SENDING UNIT NTC 21A CHECKING THE FUEL LEVEL SENSOR NTC 25A CHECKING THE A C SYSTEM NTC 26A CHECKING THE RADIATOR FAN OPERATION NTC 27A 342 TEST 1 NO TROUBLE CODE TEST MENU Perform TEST DTC Before Proceeding SYMPTOM HARD START START AND STALL HESITATION SAG STUMBLE SURGE LACK OF POWER SLUGGISH SPARK KNOCK DETONATION CUT OUTS MISSES BACKFIRE POPBACK RUNS ROUGH UNSTABLE ERR
358. or 2 trips the MIL illuminates and a trouble code is storec MIL remains on for more one bul goes oul II lhe conditions Lhal sel lhe code are not found on subsequent trips Theory of operation The catalytic converter works best when the air fuel A F ratio is at or near the optimum of 14 7 to 1 The PCM maintains this optimum air fusl ratio by makirg short term corrections in the fuel injector pulse width based the upstream O2 sensor output Tho PCM uses the programmed memory as a soltf calioration tool to compensate for variations in engine specifications sensor tolerances and engine fatigue over the life span of the engine Monitoring the actual air fuel ratio with the upstream O2 sensor shor term and comparing it to the program long term or adaptive memory determines whether the fuel system is operating within the limits needed to pass an emission test If a malfunc tion prevents the PCM from maintaining the optimum A F ratio tha MIL illuminates Possible causes gt Ignition coil gt Injectors stuck closed gt Powertrain contre module gt MAP sensor gt Engine parts tolerance gt O2 sensor upstream gt Exhaust pipe manifold gt Fuel pressure regulator gt Fuel pump gt Fuel pump relay gt Fuel pump inlet filter gt Spark plugs gt Ignition secondary wires gt Wiring harness connectors gt Low fuel level 80660063 222 5 5 TC 119A EST TC 119A REPAIRING FUE
359. ouble code actually happened This is recorded by the PCM and can be viewed on the DRB as the RESET COUNTER When there are no trouble codes stored in memory the DRB will display TROUBLE CODES FOUND and the reset counter will show RESET COUNT XXX 3 3 A Handling No Trouble Code Problems After reading Section 3 0 System Description and Functional Operation you should have a better understanding of the theory and operation of the on board diagnostics and how this relates to the diagnosis of a vehicle that may have a driveability related symptom or complaint The code system is broken down into two test methods No Code Complete Test No Code Quick Individual Test 3 4 Using the DRBIII Refer to the DRB user s guide for instructions and assistance with reading trouble codes erasing trouble codes and other DRB functions gt gt gt 2 201012 110 20 4 5200 12 3 5 DRBIII Error Messages and Blank Screen Under normal operation the DRB will display one of only two error messages User Requested WARM Boot or User Requested COLD Boot This is a sample of such an error message display ver 2 14 date 26 Jul93 file key itf cc line 548 err Ox1 User Requested COLD Boot Press MORE to switch between this display and the application screen Press F4 when done noting information 3 5 1 DRBIII Does Not Power Up If the LED s d
360. ransponder after five consecutive read attempts Theory of operation When the ignition is turned on or during key programming the SKIM attempts to power up the transponder The SKIM makes up to five attempts to communicate with the transponder If the SKIM does not receive a response from the transponder no further communication is attempted and a code is stored in memory Possible cause Failed transponder gt Invalid ignition key Electro magnetic interference gt Failed SKIM 80b5cc71 322 XJ BODY SENTRY KEY IMMOBILIZER MODULE ANTENNA TRANSPONDER CHIP IN KEY PDC 000 10 Fused WT BK Fused Ign Switch Output Run Start WT BK CCD BUS VT BR CCD BUS BK LG Ground PDC JUNCTION BLOCK 10 AMP 6 JUNCTION BLOCK TO OTHER MODULES BK LG Ground TRANSPONDER MOLDED CAP REMOVED SENTRY KEY 8066092 80666145 TEST SK 5A REPAIRING TRANSPONDER COMMUNICATION FAILURE Perform TEST SK 1A Before Proceeding START TEST SK 5A TURN IGNITION OFF USING THE DRB DOES THE DRB CONTINUE TEST WAIT 10 SECONDS READ CODES gt DISPLAY THIS CODE gt SK 5A ON THE TURN IGNITION ON NEXT PAGE 5 USING THE CONDITION REQUIRED SCHEMATIC AS A WERE ANY PROBLEMS REPAIR AS SET THE CODE IS gt GUIDE INSPECT THE FOUND NECESSARY NOT PRESENT WIRING AN
361. re 808 II10 TJ BODY BRAKE LAMP SWITCH CONNECTOR FUNCTION BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY S C BRAKE SWITCH OUTPUT FUSED B BRAKE LAMP SWITCH OUTPUT 80b099e1 FIG 2 TJ BODY POWERTRAIN CONTROL MODULE GREY CONNECTOR FUNCTION S C VAC SOL CONTROL S C VENT SOL CONTROL S C POWER SUPPLY BRAKE SW SENSE BRAKE LAMP SWITCH CONNECTOR BRAKE SW SENSE GROUND S C POWER SUPPLY S C BRAKE SW OUTPUT FUSED STOP LAMP SW OUTPUT 80b01d73 REPAIRING SPEED CONTROL CIRCUITS TJ XJ BODY SPEED CONTROL SERVO CONNECTOR FUNCTION S C VACUUM SOLENOID CONTROL S C VENT SOLENOID CONTROL S C BRAKE SWITCH OUTPUT GROUND 80504705 XJ BODY BRAKE LAMP SWITCH CONNECTOR FUNCTION 1 BRAKE SWITCH SENSE GROUND 12 VOLT SUPPLY 5 BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED B 4 80b04fe6 XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS SENSOR GROUND S C VACUUM SOLENOID CONTROL S C VENT SOLENOID S C POWER SUPPLY BRAKE SWITCH SENSE S C SWITCH SIGNAL BRAKE LAMP SWITCH CONNECTOR FUNCTION BRAKE SWITCH SENSE GROUND S C POWER SUPPLY S C BRAKE SWITCH OUTPUT BRAKE LAMP SWITCH OUTPUT FUSED 86 80ab5ce9 15 5 5 TC 15A REPAIRING SPEED CONTROL CIRCUITS Perform TEST DTC Before Proceeding A MISAJUSTED BRAKE SWITCH CAN CAUSE THIS CODE TO SET CHECK BRAKE SWITCH ADJUSTMENT BEFORE CONTINUING
362. ream Oxygen Sensor Signal DOWNSTREAM OXYGEN SENSOR Relay Output Sensor Ground BK DG IGNITION COILS Upstream Oxygen GENERATOR AND Sensor Signal INJECTORS MOOO mr ocozm oz UPSTREAM OXYGEN SENSOR 805118 1 XJ BODY POWERTRAIN CONTROL MODULE TN WT ASD RELAY Downstream Oxygen Sensor signal DOWNSTREAM OXYGEN SENSOR DGAWT ASD Relay Output Sensor Ground TO BK DG IGNITION COILS Upstream Oxygen GENERATOR AND Sensor Signal 7 INJECTORS UPSTREAM OXYGEN SENSOR 80b118a2 TEST 10 CHECKING THE OXYGEN SENSOR SWITCHING TEST NTC 1A Before Proceeding Perform START TEST NTC 10A NOTE ENGINE MUST BE RUNNING AND AT NORMAL OPERATION TEMPERATURE NOTE THE DOWNSTREAM 02 SENSOR SHOULD SWITCH SLOWER THAN THE UPSTREAM 02 SENSOR USING THE DRB READ THE 1 1 AND 1 2 02 SENSOR STATES ARE THE 1 1 AND 1 2 02 SENSOR STATES SWITCHING NORMALLY 2 02 SENSORS OPERATING NORMALLY TEST PASSED IS THE 1 1 02 SENSOR LOCKED LEAN PERFORM TEST 10 gt INSTALL A FUEL PRESSURE GAUGE TO THE FUEL LINE TURN IGNITION ON gt WITH THE DRB ACTUATE THE ASD FUEL SYSTEM TEST ALLOW FUEL PRESSURE TO STABILIZE USING THE DRB STOP FUEL SYSTEM TEST MONITOR
363. rolling code algorithm to receive decode and respond to the valid invalid key message sent by SKIM After sending the valid invalid key message the SKIM waits 3 5 seconds for an EMS status message from the powertrain controller If the PCM does not respond with a valid key message to the SKIM a fault is detected and a trouble code stored The SKIS incorporates a yellow warning lamp located in the instrument cluster The lamp is illuminated when the SKIM sends a CCD Bus message to the instrument cluster requesting the lamp on The SKIM will request lamp operation for the following bulb check at ignition on to alert the vehicle operator to a SKIS malfunction For all faults except transponder faults and VIN mismatch the lamp remains on steady In the event of a transponder fault the light flashes at the rate of 1Hz once per second If a fault is present the lamp will remain on or flashing for the complete ignition cycle 3 3 Diagnostic Trouble Codes Each diagnostic trouble code is diagnosed by following a specific testing procedure The diagnostic test procedures contain step by step instructions for determining the cause of trouble codes as well as no trouble code problems It is not necessary to perform all of the tests in this book to diagnose an individual code Always begin by reading the diagnostic trouble codes using the DRB This procedure begins in the DTC TEST Section 7 1 Checking the System for Diagnostic Trouble Codes
364. run position and engine RPM is detected If engine RPM is not detected the will remove the ASD relay control circuit ground Possible causes Relay coil open or shorted Fused ignition switch output circuit open gt Auto shutdown relay control circuit open or shorted gt Inoperative circuit driver in PCM PCM Failure Connector terminals 80a9b324 FIG 1 10 5 5 TC 10A REPAIRING AUTO SHUTDOWN RELAY CONTROL CIRCUIT Perform TEST DTC Before Proceeding USING THE DRB ACTUATE THE AUTO SHUTDOWN ASD RELAY IS THE ASD RELAY CLICKING 5 10 THE CONDITION REQUIRED TO SET THE TROUBLE CODE IS NOT PRESENT FIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY START THE ENGINE WIGGLE THE WIRING HARNESS FROM THE RELAY TO THE POWERTRAIN CONTROL MODULE DID THE ENGINE STALL WHEN WIGGLING THE WIRES REPAIR CIRCUIT AS NECESSARY WHERE WIGGLING CAUSED THE ENGINE TO STALL REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES gt TEST COMPLETE 0 MOOO mr uUuco Perform Verification TEST VER 2A Che
365. s All information illustrations and specifications contained in this manual are based on the latest information available at the time of publication The right is reserved to make changes at any time without notice 5 2 Safety and Warnings 5 2 1 Technician Safety Information WARNING Engines produce carbon monoxide that is odorless causes slower reaction time and can lead to serious injury When the engine is operating keep service areas WELL VENTILATED or attach the vehicle exhaust system to the shop exhaust removal system WARNING Before performing any secondary ignition testing with open sparks insure there are no fuel leaks or vapors present in the immediate area Set the parking brake and block the wheels before testing or repairing the vehicle It is especially important to block the wheels on front wheel drive vehicles the parking brake does not hold the drive wheels When servicing a vehicle always wear eye protection and remove any metal jewelry such as watchbands or bracelets that might make an inadvertent electrical contact When diagnosing a body system problem it is important to follow approved procedures where applicable These procedures can be found in General Information Section 9 0 Specifications or in service manual procedures Following these procedures is very important to the safety of individuals performing diagnostic tests 5 2 2 Vehicle Preparation for Testing Make sure the vehicle being tested h
366. symptom exists or a Trouble Code Set repairs are not complete Check all pertinent Technical Service Bulletins and return to TEST NTC 1A or for codes return to DTC TEST 489 AQOmMa 2 0 4 1 0101 0 zOo o m um TEST VER 2A ROAD TEST VERIFICATION Inspect the vehicle to ensure that all engine components are connected Reassemble and reconnect all components as necessary For previously read trouble codes that have not been dealt with return to DTC TEST and follow the path specified otherwise continue If the powertrain control module has not been changed 1 Connect the DRB to the PCM data link connector and erase trouble codes 2 With the DRB reset all values in the adaptive memory 3 Disconnect the DRB Ensure no trouble code remains by doing the following 1 If this test is for any A C Relay Control Circuit Code drive the vehicle for at least five minutes with the A C on For some of the drive go at least 40 mph at some point stop the car and turn the engine off for 10 seconds or more then restart and continue Ensure the transmission shifts through all gears Upon completion of the road test turn the engine off and read trouble codes with the DRB If the repaired code has reset the repair is not complete Check all related Technical Service Bulletins and return to DTC TEST if necessary If another trouble code has set return to DTC TEST and follow the path specified for that trouble code
367. tage is below 0 156 volts for 28 seconds after starting engine Theory of operation The oxygen sensor is a voltage generating device The PCM receives exhaust gas information from this O2 sensor The sensor detects exhaust gas content by a galvanic reaction within the sensor that produces a voltage After measuring the amount of oxygen in the exhaust gases the oxygen sensor tells the PCM how well its output signals are controlling the air fuel ratio Variations in the signal from this O2 sensor serve as air fuel ratio indicators Changes in the sensor signal occur because the air fuel ratio is constantly changing When oxygen content is low rich mixture the voltage signal will be low approximately 0 1 volt Possible causes Sensor output wire shorted to ground gt DirtyAwet connection causing voltage tracking in connector gt O2 sensor failure Powertrain control module failure Connector terminals Connector wires 80001 1 TJ BODY POWERTRAIN CONTROL MODULE TNANT Downstream Oxygen Sensor Signal DOWNSTREAM DG PK OXYGEN SENSOR ASD Relay Output OR DG ASD Relay Output BR YL Sensor Ground BK BK DG Ground Upstream Oxygen Sensor Signal TO IGNITION COILS GENERATOR AND INJECTORS UPSTREAM OXYGEN SENSOR 80511841 264 02 SENSOR CONFIGURATION UPSTREAM DOWNSTREAM UPSTREAM DOWNSTREAM XJ BODY POWERTRAIN CONTROL MODULE TNANT Downstream Relay O
368. tart 67 0 gt JUNCTION WT BK BLOCK CCD BUS T Vren OTHER CCD BUS MODULES BK LG Ground BK LG Ground 8066092 of code Invalid or Wrong Key Message From SKIM When Monitored With ignition on Set Condition The PCM does not receive a valid key message from the SKIM module Theory of operation At ignition on the module sends message to the PCM verifying the correct ignition key If the PCM receives a correct message it will allow the engine to start and continue to run If the PCM does not receive a message or receives an incorrect message the PCM will allow the engine to start and run for two seconds If the PCM does not receive a valid key message in six start attempts the PCM will disable the starter relay until a valid message is received Possible causes Ignition key not programmed Wrong ignition key Incorrect VIN stored in PCM Failed SKIM module Failed PCM 80b118e7 FIG 1 5 232 CONTINUED FROM THE PREVIOUS PAGE EST TC 232A REPAIRING INVALID OR WRONG KEY MESSAGE FROM SKIM USING THE DRB ATTEMPT TO COMMUNICATE WITH THE SKIM 5 PERFORM SK TEST DTC WITH THE DRB CHECK FOR SKIM TROUBLE CODES 5 TROUBLE CODES PERFORM SK TEST DTC
369. than 4 5 volts for 2 minutes Theory of operation A single wire referenced to sensor return ground is used to sense steering wheel mounted switches Each switch has an associated resistance valve The switch resistance forms a voltage divider with the PCM s internal pull up resistor to 5 volts The resistor divider creates a unique voltage at the PCM s input pin thereby allowing multiple switches to be multiplexed on a single input Possible causes gt Switch circuit shorted PCM failure Shorted S C switch One or more switch stuck or held closed 808507 TJ XJ BODY SPEED CONTROL SWITCH CONNECTOR COLOR FUNCTION BR YL RD LG SPEED CONTROL SIGNAL 80ab3724 REPAIRING SPEED CONTROL SWITCH ALWAYS LOW SPEED CLOCK SPRING POWERTRAIN CONTROL MODULE BR YL SENSOR GROUND RD LG SPEED CONTROL SW SIGNAL YL RD 1 12 VOLT SUPPLY WT PK BRAKE SWITCH SENSE SERVO 2090 SOLENOIDS S C VAC SOL CONTROL DB RD 5 BRAKE SW OUTPUT SWITCH 806099960 TJ XJ BODY POWERTRAIN CONTROL MODULE CONNECTORS FUNCTION BR YL SENSOR GROUND TN RD VACUUM SOL CONTROL LG RD S C VENT SOL CONTROL YL RD 12 VOLT SUPPLY WT PK BRAKE SWITCH SENSE RD LG 5 C SWITCH SIGNAL 80060105 200 TEST 87 5 5 TC 87A RECORD ALL DTC S AND FREEZE FRAME DATA NOW ERASE CODES BEFORE PROCEEDING USING THE DRB READ THE S C SWITCH VOLTS
370. the manifold It provides a 0 10 5 volt signal to PCM The MAP sensor puts out a low voltage signal 0 5 to 1 8 volts at idle when the manifold vacuum is high and a higher voltage signal 3 9 to 4 8 volts at deep throttle when the manifold vacuum is low The MAP receives 5 supply from PCM voltage may vary from 4 8 to 5 1 volts The sensor ground is provided by PCM Possible causes Open 5 volt supply MAP sensor failure 808080181 5 36 START TEST 36 5 LET IDLE WITH THE DRB READ THE MAP SENSOR VOLTAGE REPAIRING MAP SENSOR VOLTAGE TOO LOW NO 5 VOLTS TO MAP SENSOR Perform TEST DTC Before Proceeding IS THE MAP SENSOR VOLTAGE BELOW 0 2 VOLTS CONTINUE TEST TC 36A ON THE NEXT PAGE TURN IGNITION ON ENGINE OFF WITH THE DRB READ THE MAP SENSOR VOLTAGE IS TNE MAP SENSOR VOLTAGE BELOW 2 35 VOLTS 5 36 WIGGLE MAP SENSOR CONNECTOR AND HARNESS MONITOR THE DRB DISPLAY WAS THERE ANY MAP SENSOR VOLTAGE CHANGE REPAIR THE HARNESS OR CONNECTOR THAT CAUSED THE VOLTAGE CHANGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 OR
371. tion The fuel sending unit provides a variable voltage signal to the powertrain control module to indicate fuel level The purpose of this feature is to prevent false setting of misfire and fuel system monitor codes when the vehicle is operating at low fuel levels When the fault is detected by the PCM the PCM will default the fuel gauge to an empty reading This will alert the driver of a malfunction in the fuel level sending unit system Possible causes Sensor signal circuit high resistance gt Fuel level sending unit failure gt Connector wires gt Connector terminals 80b6f010 254 TEST TC 151A REPAIRING FUEL LEVEL SENDING UNIT NO CHANGE OVER TIME Perform TEST DTC Before Proceeding KEY ON USING THE IS THE FUEL LEVEL START TEST DRB READ THE FUEL SENDING UNIT COMTINUE TEST 151 LEVEL SENDING UNIT gt VOLTAGE BETWEEN gt TC 151A ON THE VOLTAGE 9 4 AND 9 95 NEXT PAGE VOLTS NO THIS TIME THE USING THE CONDITION REQUIRED SCHEMATIC AS A WERE ANY PROBLEMS REPAIR AS TO SET THE CODE IS GUIDE INSPECT THE gt FOUND NECESSARY NOT PRESENT WIRING AND FIG 1 CONNECTORS REFER GENERAL INFO 3 3 2 FOR ADDITIONAL gt TEST COMPLETE INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 2A Check connectors Clean repair as necessary 255 0
372. tion Switch Output IGNITION To SWITCH 15 AMP IGNITION SWITCH 80d09ab9 80061045 5 18 CONTINUED FROM THE PREVIOUS PAGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 REFER TO GEN INFO 3 3 2 FOR INFORMATION ON INACTIVE TROUBLE CODES EST TC 18A CONTINUED REPAIRING EVAP PURGE SOLENOID CIRCUIT RECONNECT THE VACUUM HOSES USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEM FOUND REPAIR AS NECESSARY WITH THE DRB READ CODES NOTE ACTUATE THE EVAP SOLENOID WIGGLE WIRING HARNESS FROM THE SOLENOID TO THE PCM DOES THE EVAP SOLENOID EVER STOP ACTUATING REPAIR AS NECESSARY WHERE WIGGLING CAUSED PROBLEM TO APPEAR TEST COMPLETE MOOO mr oUco Perform Verification TEST VER 2A Check connectors Clean repair as necessary 0 MOOO CC TEST 19 REPAIRING INJECTOR 3 CONTROL CIRCUIT Perform TEST TC 21A Before Proceeding INJECTOR 1 INJECTOR 1 CONNECTOR CONNECTOR ASD RELAY OUTPUT TJ DG LG ASD RELAY OUTPUT TJ ASD RELAY OUTPUT XJ DG OR ASD RELAY OUTPUT XJ INJECTOR 1 DRIVER TN INJECTOR 1 DRIVER INJECTOR 1 INJECTOR 1 COLOR FUNCTIO
373. tion does not adjust the ignition timing Ignition timing valves are determined by the powertrain control module T The readings below are only indicators of possible mechanical engine problems 027 NORMAL BLOWN NORMAL WORN LATE VALVE READING HEAD READING RINGS OR TIMING RANGE GASKET RAPID DILUTED OIL VACUUM ATIDLE ATIDLE ACCELERATION RAPID DECELERATION ACCELERATION DECELERATION RESTRICTED STICKING WORNVALVE WORNVALVE EXHAUST VALVE GUIDES SPRINGS DROPS AT IDLE STEADIES AS MORE TOWARD ENGINE ZERO AS gt PRONOUNCED ENGINE RPM INCREASES INCREASES SPEED INCREASES 0920606 369 0 400 4 MOOO mr ocozm4 oz TEST NTC 15A CHECKING BATTERY TEMP SENSOR Perform TEST NTC 1A Before Proceeding TO POWERTRAIN OTHER CONTROL SENSORS MODULE BATTERY TEMPERATURE BR YL SENSOR Sensor Ground 0 400 4 MOOO mr ocozm oz PK YL Battery Temperature sensor Signa 80b118ad TEST 15 CHECKING BATTERY TEMP SENSOR Perform TEST NTC 1A Before Proceeding START TEST NTC 15A USING A TEMP PROBE READ A R BATT TEMPERATURE NEAR THE BATTERY TEMP SENSOR COMPARE TEMPERATURE TO DRB BATTERY TEMP SENSOR READING Perform Verification TEST VER 2A gt 15 WITHIN 15 C 5 F OF EACH OTHER REPLACE THE BATTERY TEMP SENSOR Check connectors Clean rep
374. to power up the sensor Sensor ground is supplied by the PCM The PCM also supplies a 5 volt pull up voltage to the sensor The VSS signal is created with the sensor alternates the 5 volt pull up from high to low Possible causes gt VSS adapter misaligned or not seated properly gt Open or shorted signal circuit gt Speedometer pinion damaged gt Open 5 valt supply circuit gt Open sensor ground circuit gt Failed vehicle speed sensor gt Failed 80a5573b 124 TEST 35 5 5 TC 35A REPAIRING NO VEHICLE SPEED SENSOR SIGNAL Perform TEST DTC Before Proceeding RAISE THE DRIVE WHEELS OFF THE GROUND WARNING BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING WHEELS PUT TRANSMISSION IN ANY FORWARD GEAR ALLOW THE WHEELS TO ROTATE START THE ENGINE WITH THE DRB READ THE VEHICLE SPEED SENSOR DOES THE DRB DISPLAY ABOVE ZERO MPH CONTINUED TEST TC 35A ON THE NEXT PAGE AT THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT EIG 1 USING THE SCHEMATIC AS A GUIDE INSPECT THE WIRING AND CONNECTORS WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES Perform Verification TEST VER 2A TEST COMPLETE
375. urn the ignition on transmission in park neutral 2 Use the DRB and select MISCELLANEOUS from the main menu 3 Select PCM REPLACED GAS ENGINE 4 Enter secured access mode by entering the vehicle four digit PIN NOTE If three attempts are made to enter secure access mode using an incorrect PIN secured access mode will be locked out for one hour To exit this lockout mode turn the ignition to the RUN position for one hour then enter the correct PIN Ensure all accessories are turned off Also monitor the battery state and connect a battery charger if necessary 5 Press ENTER to transfer the secret key the SKIM will send the secret key to the PCM 8 2 Programming the Sentry Key Immobilizer Module NOTE If the PCM and the SKIM are replaced at the same time program the VIN into the PCM first All vehicle keys will need to be replaced and programmed to the new SKIM 1 Turn the ignition on transmission in park neutral 2 Use the DRB and select THEFT ALARM SKIM MISCELLANEOUS 4 Program the vehicle four digit PIN into SKIM 5 Select COUNTRY CODE and enter the correct country NOTE Be sure to enter the correct country code If the incorrect country code is programmed into SKIM the SKIM must be replaced 6 Select UPDATE VIN the skim will learn the VIN from the PCM 7 Press ENTER to transfer the secret key the PCM will send the secret key to the SKIM 8 Program ignition keys to SKIM
376. uses Connector terminals and or wires Park neutral switch failure Mechanical transmission problem gt failure 80 0 39 206 5 5 114 KEY USING THE DRB OBSERVE PARK NEUTRAL SWITCH INPUT STATE SELECTOR FROM PARK TO REVERSE WHILE OBSERVING THE DRB DISPLAY EST TC 114A REPAIRING P N SWITCH STUCK IN PARK OR GEAR Perform TEST DTC Before Proceeding DID THE DRB DISPLAY P N D R AND gt 5 114 THIS TIME THE CONDITION REQUIRED TO SET THE CODE IS NOT PRESENT FIG 1 gt 5 AND CONNECTORS RELATING TO PARK NEUTRAL POSITION SWITCH WERE ANY PROBLEMS FOUND REPAIR AS NECESSARY REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORAMTION ON INTERMITTENT CODES Perform Verification TEST VER 2A gt TEST COMPLETE Check connectors Clean repair as necessary 207 0 MOOO CC TEST 114 CONTINUED REPAIRING P N SWITCH STUCK PARK OR GEAR ALL OTHERS POWERTRAIN CONTROL MODULE BLACK CONNECTOR FUNCTION PARK NEUTRAL POSITION SW SENSE XJ 2 51 A6 BR LB PARK NEUTRAL POSITION SW SENSE TJ 2 5L
377. utput XJ2 5L XJ2 5L UPSTREAM DOWNSTREAM XJ4 0L XJ4 0L UPSTREAM DOWNSTREAM 80b76ec3 ASD RELAY DOWNSTREAM OXYGEN SENSOR BR YL Sensor Ground BK DG Upstream Oxygen Sensor Signal TO IGNITION COILS GENERATOR AND INJECTORS UPSTREAM OXYGEN SENSOR 80b118a2 5 5 155 REFER THE FIGURE FOR POSSIBLE TROUBLE CODE CAUSES FIG 1 IF ENGINE IS WARM TURN ENGINE OFF FOR 15 MINUTES TO ALLOW 02 SENSOR TO COOL DOWN KEY ON ENGINE OFF USING THE DRB MONITOR THE 1 1 02 SENSOR VOLTAGE EST TC 155A REPAIRING 1 1 02 SENSOR SHORTED TO GROUND Perform TEST DTC Before Proceeding IS THE 1 1 02 SENSOR VOLTAGE BELOW 0 16V 155 NOTE SHORTED LOW CONDITION DUE TO WATER IN THE SENSOR CONNECTOR MAY BE TEMPORARY WIGGLE THE 1 1 02 SENSOR HARNESS AND MONITOR THE VOLTAGE DID THE 1 1 02 SENSOR VOLTAGE CHANGE WHILE WIGGLING WIRE REPAIR THE HARNESS OR WIRING FOR AN INTERMITTENT SHORT TO GROUND REFER TO GENERAL INFO 3 3 2 FOR ADDITIONAL INFORMATION ON INTERMITTENT CODES THE CONDITION REQUIRED TO SET THIS TROUBLE CODE IS NOT PRESENT AT THIS TIME Qo 0m MOOO mr oUco Perform Verif
378. ver C30 01 VT BR CCD Bus 4 B10 K20 DG Generator Field Driver C32 V37 RD LG S C Switch Signal r JJmzmcao 2 0 4 520 2 gt 2 2 gt 2 41 XJ BODY gt TAL 27 Powertrain Control Module Continued 3 32 WAY CONNECTORS PASS H Wl Ra VSS Ge CL GN A ROR Hiro Gs 1 SANA 749 Ao 5 Ag j A gt d FON gt K 804d8eb3 POWERTRAIN CONTROL MODULE CONNECTORS C GREY 80 07547 CKT COLOR FUNCTION CAV CKT COLOR FUNCTION A2 F12 DB WT Fused Ignition Switch Output B10 K20 DG Generator Field Driver A4 K167 BR YL Sensor Ground B11 K54 OR BK TCC Solenoid Control 2 5L A T A6 T41 BR LB PNP Switch Sense 2 5L A T B12 K16 LG BK Injector 6 Driver A6 Z1 BK Ground 2 5L M T B15 K12 TN Injector 2 Driver A6 T41 BK WT Transmission Range Switch B16 K14 LB BR Injector 4 Driver Sense 4 0L A T B23 G60 GY YL Oil Press Sensor Signal 19 Ign Coil Driver B27 G7 WT OR Vehicle Speed Sensor Signal A8 K24 GY BK CKP Sensor Signal B31 K6 VT OR 5 Volt Supply Secondary A10 K60 YL BK Idle Air Control 43 Driver C1 C13 DB OR A C Comp Clutch Relay Control A11 K40 BR WT Idle Air Control 42 Driver C2 C27 DB PK Rad Fan Relay Control A12 K10 DB BR Power Steering Pressure Switch C3 K51 DB YL ASD Relay Control 2 51 C4 36 S C Vacuum Solenoid Control Pis 1621 680 IAT Signal
379. will store the trouble code Qo 0m MOOO mr uUuco Theory of operation The torque converter lock up system locks ihe crankshaft to the output shafl of ihe transmission when vehicle road load is stable and ssion is in third gear This action reduces trans nission heating and improves fuel economy The lock up system is controlled the powertrain control module Possible causes Drive wheel size is bigger than standard wheel size or smaller than spare wheel size Low transmission oil level or pressure Debris in transmission oil Incorrect speedo gear for the front wheels PTU solenoid not securely connected or stuck Malfunctioning lock up valve in transmission Hydraulic leak at torque converter lock up clutch Worn out friction material on friction disc in torque converter Failed gear box or differential Powertrain contral module failure Worn out connector terminals wires gt gt gt gt gt gt gt gt gt gt gt 3380104 TJ XJ BODY WITH 3 SPD AUTO TRANSMISSION POWERTRAIN TORQUE CONTROL MODULE CONVERTER CLUTCH Fuseo Ign Sw Output SOLENOID TCC Solenoid Relay Control 4070105 240 148 5 5 148 CONTINUED REPAIRING TORQUE CONVERTER CLUTCH NO RPM DROP LOCK UP TJ XJ BODY WITH 3 SPD AUTO TRANS CHECK TRANSMISSION FLUID AND FOR ANY DEBRIS IS THE FLUID LEVEL OK AND CLEAR FROM CONTAMINATION

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