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1. IG f 87 20 FUSE RELAY BLOCK FRONT CONTROL MODULE 169 CONNECTOR PINOUTS SPARE PARK LAMP RELAY HORN RELA Y COMPRESSOR CLUTCH RELA Y FUEL PUMP RELA Y FRONT BLOWER OTOR RELA Y o N N o R TRANSMISSION SAFETY HUTDOWN RELAY c AME BRAND SPEAKER RELAY 4 2 7 FRONT WIPER ON OFF RELAY CONNECTOR PINOUTS
2. CIRCUIT FUNCTION 1 16 20DB GY FUSED REAR WINDOW DEFOGGER RELAY OUTPUT 2 T75120YL FUSED IGNITION SWITCH OUTPUT START 1025 20WT VT PCI BUS 4 5 32 18DB YL BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID CONTROL BLACK W7 20BR GY FRONT WIPER PARK SWITCH SENSE 1820 20DG OR BRAKE FLUID LEVEL SWITCH SENSE 10 paag HEHEH 1 9 F201 18PK OR FCM OUTPUT RUN START 20 59999 9999 11 10 F214 20PK LG FCM OUTPUT RUN START LI 11 A106 20LB RD FUSED B TELLIGENT 12 POWER 1 F2 18PK WT FCM OUTPUT UNLOCK RUN START ODULE C7 14 15 A114 16GY RD FUSED B I 0 D 16 023 20WT BR FLASH PROGRAM ENABLE 17 150 18WT TN BRAKE LAMP SWITCH OUTPUT 18 16DG BR PREMIUM 8 NAME BRAND SPEAKER RELAY OUTPUT SPEAKER 19 20DG VT HORN SWITCH SENSE 20 F100 18 FCM OUTPUT RUN c N INTELLIGENT POWER MODULE C9 BLACK 10 WAY CIRCUIT FUNCTION E 1 12WT RD FUSED B C 2 F20 18PK WT FUSED IGNITION SWITCH OUTPUT RUN START 1 15 12DB WT FUSED REAR WINDOW DEFOGGER RELAY OUTPUT 5 4 105 18DB RD FUSED R 5 Let 18WT LG LEFT FRONT TURN SIGNAL OUTPUT 10 6 6 A701 16BR RD FUSED B HAZARD E T 6 701 16BR RD FUSED B HAZARD IN LLIGEN 7 F306 16DB PK FUSED ACCESSORY RELAY OUTPUT RUN ACC OWER 8 F30 12PK YL POWER FUSED ACCESSORY RELAY OUTPUT RUN ACC MODULE C9
3. FUSES IPM FUSE AMPS FUSED CIRCUIT FUNCTION NO 1 20A INTERNAL FUSED 2 15A INTERNAL FUSED PARK LAMP RELAY OUTPUT 3 15A INTERNAL FUSED PARK LAMP RELAY OUTPUT 4 30A INTERNAL FUSED 5 20A F306 16DB PK FUSED ACCESSORY RELAY OUTPUT 6 20A F307 16LB PK BATTERY POSITION FUSED 6 20A F307 16LB PK ACCESSORY RELAY POSITION FUSED ACCESSORY RELAY OUTPUT 8 20A INTERNAL FUSED 9 40A INTERNAL FUSED 10 40A C7 12DB FUSED FRONT BLOWER MOTOR RELAY OUTPUT 11 20A F302 18GY PK FUSED ACCESSORY RELAY OUTPUT 12 25A C51 12LB BR FUSED REAR BLOWER MOTOR RELAY OUTPUT 13 40A C15 12DB WT FUSED REAR WINDOW DEFOGGER RELAY OUTPUT 14 15A INTERNAL FUSED 1 0 0 15 20A INTERNAL FUSED 16 25A INTERNAL FUSED 17 20A INTERNAL FUSED 18 15A INTERNAL FUSED 19 40A A101 12VT RD FUSED 20 40 A102 12WT RD FUSED 21 25A A111 12DG RD FUSED N 22 40 A110 120R RD FUSED E 23 10A A106 20LB RD FUSED 24 20A A701 16BR RD FUSED B HAZARD T 26 20A A103 18GY RD FUSED 27 40A A112 120R RD FUSED R 28 40A F30 12PK YL FUSED ACCESSORY RELAY OUTPUT 30 40A SPARE SPARE 31 40A A113 12WT RD FUSED B P 32 40A A115 12YL RD FUSED N 33 15A INTERNAL FUSED ACCESSORY RELAY OUTPUT T TRANSMISSION SAFETY SHUTDOWN RELAY T CAV CIRCUIT FUNCTION S 30 INTERNAL FUSED 85 2115 20BK OR GROUND 86 T15
4. CR RH ne ku ewe ed 69 SOLENOID CIRCUIT 25 iE FEIER ERU RES 72 P1714 LOW BATTERY VOLTAGE 5 gues ER re REOR ER PO RR Ee RR ES 75 P1716 BUS COMMUNICATION WITH 79 P1717 NO COMMUNICATION WITH THE MIC 81 P1738 HIGH TEMPERATURE OPERATION ACTIVATED 83 P17399 POWERJIIFUAT SPEED dam edax dra pute 85 P1765 SWITCHED BATTERY ses asins ua artana E tede 86 P1767 TRANSMISSION RELAY ALWAYS ON 89 P1768 RELAY OUTPUT ALWAYS OFF aiu des deeem 92 P1775 SOLENOID SWITCH VALVE LATCHED IN TCC POSITION 96 P1776 SOLENOID SWITCH VALVE LATCHED IN LR 100 P1781 OD PRESSURE SWITCH SENSE CIRCUIT yh 104 P1782 2 4 PRESSURE SWITCH SENSE CIRCUIT 22 mmm 107 P1784 LR PRESSURE SWITCH SENSE CIRCUIT exea miseret ehe 110 P1787 OD HYDRAULIC PRESSURE TEST FAILURE 22h rh 114 P1788 2 4 HYDRAULIC PRESSURE TEST FAILURE 118 P1789 2 4 OD HYDRAULIC PRESSURE TEST 122 P1790 FAULT IMMEDIATELY AFTER SHIFT 123 P1791 LOSS OF PRIME 124 P1782 BATTEHY WAS DISCONNECTED ivre ERR 127 P1793 THD LINK
5. 21 DIAGNOSTIC INFORMATION AND 23 TABLE OF CONTENTS Continued TRANSMISSION P0120 THROTTLE POSITION SENSOR SIGNAL CIRCUIT 24 P0600 SERIAL COMMUNICATION LINK MALFUNCTION 26 P0604 INTERNAL iiie epar RR ERR REUS CR XH RR p xa acre 28 POUBOSINTEBINAD TOM tagitagi IRURE US 29 POZOD INTERNAL TOM RR ER E dua 30 P0705 C HECK SHIFTER SIGNAL eee es 31 POZ15 INPUT SPEED SENSOR ERROR rh idee 38 POUZ2U0 DUTPUT SPEED SENSOR ERROR erre ER oe 42 P0725 ENGINE SPEED SENSOR CIRCUIT 3 3L 3 8L 46 PO 25 ENGINE SPEED SENSOR CIRCUIT BBL 555555 ERR ERE 48 P0731 GEAR RATIO ERROR IN AST iade kr ERR RR Emme 51 P0732 GEAR RATIO ERROR IN 2ND pue ERE PRSE 53 POZSS GEAR RATIO ERROR IN SRD ieu hk rh ER ERR RE e RR 55 734 RATIO ERROR IN 4TH eso bound AREE ee idan eos 57 P0736 GEAR RATIO ERROR IN REVERSE eR mr RR 59 P0740 TORQUE CONVERTER CLUTCH CONTROL 61 P0750 LR SOLENOID CIRCUIT is cers rey E E RE hh Rs 63 0755 24 SOLENOID CIRCUIT 34 744 du dekh Seah p E 66 P0760 OD SOLENOID
6. CAV AUTOSTICK SWITCH CIRCUIT FUNCTION T55 20YL VT AUTOSTICK OVERDRIVE OFF MUX INPUT 2 Z65 20BK YL GROUND BODY CONTROL MODULE C2 BLACK GREEN 34 WAY CAV CIRCUIT FUNCTION 1 161 18WT LG LEFT FRONT TURN SIGNAL DRIVER 2 1163 18WT DG LEFT REAR TURN SIGNAL DRIVER 3 1160 18WT TN RIGHT FRONT TURN SIGNAL DRIVER 4 1162 18WT BR RIGHT REAR TURN SIGNAL DRIVER 5 F20 20PK WT FUSED IGNITION SWITCH OUTPUT RUN START 6 1625 20VT TN EXCEPT LIFTGATE SWITCH MUX LOWLINE 7 114 20GY RD FUSED B I O D 8 9 L1 18WT LG BACK UP LAMP DRIVER 10 P3 20TN WT LEFT FRONT DOOR LOCK DRIVER 11 P2 20TN GY RIGHT FRONT DOOR LOCK DRIVER 12 P38 20TN DB RIGHT SLIDING DOOR LOCK DRIVER 13 14 15 1215 18BK TN GROUND A 16 G920 20VT YL MEMORY MEMORY SELECT SWITCH RETURN H 17 0153 20VT YL POWER LIFTGATE MODULE WAKE UP SIGNAL LIFTGATE 18 P32 20TN VT LEFT SLIDING DOOR LOCK DRIVER 19 1210 18BK TN GROUND 20 20TN OR LEFT SLIDING DOOR UNLOCK DRIVER 21 22 P30 20TN DG LIFTGATE HANDLE SWITCH SENSE 23 24 9200 20VT BR MEMORY MEMORY SELECT SWITCH MUX 25 M22 20YL OR COURTESY LAMPS DRIVER 26 20TN BR RI
7. 6 No Adjust the Transmission fluid level per the Service Information Repair the cause of the incorrect Transmission Fluid level Perform 41 TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Repair internal transmission problem nspect the Valve Body per service information and replace if necessary If no problems found in the Valve Body replace the Solenoid Pressure switch assembly Replace the Torque Converter in either case Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set the DTC are not present at this time Using the schematics as guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits This DTC can also be set under extreme temperature conditions this is usually 62 TRANSMISSION Symptom 750 SOLENOID CIRCUIT When Monitored and Set Condition P0750 LR SOLENOID CIRCUIT When Monitored Initially at power up then every 10 seconds thereafter The solenoids will also be tested immediately after a Gear Ratio or Pressure Switch error is detected Set Condition Three consecutive solenoid continuity test failures or one failureif a test is run in response to a Gear Ratio or Pressure Switch error POSSIBLE CAUSES RELATED RELAY DTC S PRESENT INTERMITTENT WIRING AND CONNECTORS TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT O
8. 3 3 8 QUICK LEARN The Quick Learn function customizes adaptive parameters of the TCM tothe transmission charac teristics of a vehicle This gives the customer im proved as received shift quality compared to the initial parameters stored in the TCM Notes about Quick Learn Features The nature of the Quick Learn function requires that certain features must be taken into consider ation gt Quick Learn should generally not be used as a repair procedure unless directed by a repair or diagnostic procedure If the transmission system is exhibiting a problem that you think is caused by an invalid CVI you should try to relearn the value by performing the appropriate driving ma neuver n most cases if a quick learn makes a vehide shift better the vehicle will return with the same problem Before performing Quick Learn it is imperative that the vehide be shifted into OD with the engine running and the oil level set to the correct level This step will purge air from the dutch circuits to prevent erroneous dutch volume val ues which could cause poor initial shift quality If an unused is installed on a vehicle with HOT engine Quick Learn will cause the to report a cold calculated oil temperature This requires monitoring the calculated oil tempera ture using the DRBIII If the temperature is below 15C 60 F the transmission must be run at idle or driven in gear until it goes above 15C 60 F If
9. is disconnected from battery power ground It will also be set during the DRBIII Quick Battery Disconnect procedure POSSIBLE CAUSES QUICK LEARN WAS PERFORMED RECENT BATTERY DISCONNECTION TCM WAS REPLACED OR DISCONNECTED INTERMITTENT WIRING AND CONNECTORS FUSED CIRCUIT TO TCM OPEN GROUND CIRCUIT OPEN ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine DTC s prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehide such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s r
10. APPLICABILITY With the DRBIII9 Check the STARTS SINCE SET counter Note This counter only applies to the last DTC set Is the STARTS SINCE SET counter equal to zero Yes gt GoTo 2 No GoTo 5 With the DRBIII check all of the other modules on the vehicle for evidence of a vehide bus problem Bus related DTC s in other modules point to an overall vehide bus problem Other symptoms such as a customer complaint of intermittent operation of bus controlled features also indicate a bus problem Does the PRNDL display indicate No Bus or is there any evidence of an overall vehide bus problem Yes Refer to the Communications category for the related symp tom s Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 Ignition on engine not running With the DRBIII clear all DTC s Start the engine in park With the DRBIII read the MIC DTC s Can the DRBIII communicate with the MIC Yes gt GoTo 4 No Refer to the communication category and perform symptoms related for No Response to MIC Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 81 TRANSMISSION P1717 NO COMMUNICATION WITH THE MIC continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII9 erase TCM DTC s Start the engine in park With the DRBIII9 read Transmission DTC s Is the DTC P1717 No Communication with the MIC present Yes Replace the TCM WITH THE DRBIII PERFOR
11. Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 42 TRANSMISSION 720 SPEED SENSOR ERROR Continued APPLICABILITY Start the engine in park Raise the drive wheels off of the ground WARNING PROPERLY SUPPORT THE VEHICLE Place transmission in drive release foot from brake WARNING BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING WHEELS Note The drive wheels must be turning at this point With the DRBIII9 observe the Output RPM Is the Output RPM below 100 Yes GoTo 3 GoTo 11 Turn the ignition off to the lock position CAUTION Remove the Start
12. Yes Yes 14 P1767 Relay output always on Yes Yes 15 P1768 Relay output always off Yes Yes 16 P0605 Internal Yes Yes 17 P0604 Internal Yes Yes 18 P0725 Engine speed input circuit Yes Yes 19 P1716 Bus communication with engine module No No 20 P1765 Switched battery Trans Relay Output Yes Yes 21 P1781 OD pressure switch sense circuit Yes Yes 22 P1782 2 4 pressure switch sense circuit Yes Yes 24 P1784 L R pressure switch sense circuit Yes Yes 28 P0705 Check shifter signal No No 29 PO120 Throttle position sensor signal circuit No No 31 P1787 OD hydraulic pressure switch circuit Yes Yes 32 P1728 24 hydraulic pressure switch circuit Yes Yes 33 P1728 00 24 hydraulic pressure switch circuit Yes Yes 35 P1791 Loss of prime No No 36 P1790 Fault immediately after shift No No 37 P1775 Solenoid switch valve latched in TCC position No Yes 38 740 Torque converter clutch control circuit No Yes 45 P1795 Internal No No 47 P1776 Solenoid switch valve latched in L R position Yes Yes 48 P1793 TRD link communication error No No Yes 3 3L 3 5L 50 P0736 Gear ratio error in reverse Yes Yes 51 P0731 Gear ratio error in 1st Yes Yes 52 P0732 Gear ratio error in 2nd Yes Yes 53 P0733 Gear ratio error in 3rd Yes Yes 54 P0734 Gear ratio error in 4th Yes Yes 56 P0715 Input speed sensor error Yes Yes 57 P0720 Output speed sensor error Yes Yes 58 P1794 Speed sensor ground error Yes Yes 70 P1796 Autostick sensor circuit No No GENERAL INFORMATION
13. CONNECTOR 1 T 12 S 18 14 016 20WT OR SCI RECEIVE 15 16 A105 20DB RD FUSED B 4 164 DIAGNOSTIC JUNCTION PORT INPU SPEED SENSOR 3 3 3 8L ATURAL 10 E 20 9609 ELLIG POWE ODULE C3 gt CONNECTOR PINOUTS DIAGNOSTIC JUNCTION PORT BLACK 16 WAY CAV CIRCUIT FUNCTION 1 1025 20WT VT PCI BUS PCM SKIM 2 1025 20WT VT PCI BUS HVAC 3 1025 20WT VT PCI BUS RADIO 4 D25 20WT VT PCI BUS ORC 5 1025 20WT VT PCI BUS CLUSTER 6 1025 20WT VT PCI BUS BCM 7 D25 20WT VT PCI BUS DLC 8 D25 20WT VT BUS OVERHEAD CONSOLE 9 1025 20WT VT PCI BUS IPM 10 1025 20WT VT PCI BUS LSIACM 11 1025 20WT VT BUS MEMORY SEAT MIRROR 12 025 20WT VT PCI BUS PWR LT RT LIFTGATE 18 025 20WT VT PCI BUS RSIACM 14 7 15 16 INPUT SPEED SENSOR 3 3L 3 8L GRAY 2 WAY CAV CIRCUIT FUNCTION 1 T13 18DG VT SPEED SENSOR GROUND 2 T52 18DG WT INPUT SPEED SENSOR SIGNAL INTELLIGENT POWER MODULE C3 NATURAL 20 WAY CAV CIRCUIT FUNCTION 1 7115 20BK OR 3 3L 3 8L GROUND 2 18PK WT 3 3L 3 8L OUTPUT UNLOCK RUN START 77
14. DTC P Code Name of Code Limp in MIL 71 P1797 Manual shift overheat No No 73 P1798 Worn out burnt transmission fluid No No 74 P1799 Calculated Oil temperature in use No No 75 P1738 High temperature operation activated No No 76 P1739 Power up at speed No No 77 P1717 communication with the No No 78 P0600 Serial communication link malfunction No No 79 P1714 Low battery voltage Yes Yes Yes underlined indicates that this DTC can take up to five minutes of problem identification before illuminating the MIL 3 3 7 DTC DESCRIPTIONS Name of code P1792 12 Battery was Discon nected Informational code Only When monitored Whenever the key is in the Run Start position Set condition This code is set whenever the Transmission Control Module TCM is discon nected from battery power B or ground It will also be set during the DRBIII9 Battery Disconnect procedure Theory of operation A battery backed RAM Random Access Memory is used to maintain some learned values When the battery B is discon nected the memory is lost When the B is re stored this memory loss is detected by the TCM The code is set and the learned values are initial ized to known constants or previously learned val ues from EEPROM Electronic Erasable Program mable Read Only Memory This results in the initialization of some parameters Transmission Effects Loss of trouble code data Immediate limp in mode if power is lost while operat
15. Repair the L R Solenoid Control circuit for a short to voltage Perform 41 TRANSMISSION VERIFICATION TEST VER 1 65 TRANSMISSION Symptom P0755 2 4 SOLENOID CIRCUIT When Monitored and Set Condition 0755 2 4 SOLENOID CIRCUIT When Monitored Initially at power up then every 10 seconds thereafter They will also be tested immediately after a Gear Ratio or Pressure Switch error is detected Set Condition Three consecutive Solenoid continuity test failures or one failureif test is run in response to a Gear Ratio or Pressure Switch error POSSIBLE CAUSES RELATED RELAY DTC S PRESENT INTERMITTENT WIRING AND CONNECTORS TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN 2 4 SOLENOID CONTROL CIRCUIT OPEN 2 4 SOLENOID CONTROL CIRCUIT SHORT TO GROUND 2 4 SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE 2 4 SOLENOID TCM 2 4 SOLENOID ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine DTC s prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as
16. gt Low transmission fluid level gt PRNDL indicates a valid OD code in the hydrau lic reverse position gt Transmission fluid filter clogged or damaged gt Transmission fluid filter improperly installed Bolts loose or O ring missing gt Oil pump If a customer has a problem when the transmission is cold whereby he shifts to reverse gets reverse and then shifts to OD and does not get OD gets a neutral condition and then can not get reverse or OD for between 3 20 seconds replace the oil pump High side dearance in the oil pump will set a code 35 The pump will prime upon start up but as thetorque converter purges air drain down the air will leak across theinner rotor into the pump suction port and cause a loss of prime right after the shift into OD After 3 20 seconds pump prime will return and normal operation will continue The pump should be replaced only after all other possible causes above have been checked and verified Name of code P1790 36 Fault Immediately After Shift When monitored After a gear ratio error is stored Set condition This code is set if the associated gear ratio code is stored within 1 3 seconds after a shift Theory of operation This code will onl y be stored along with a 50 series code If this code is set it indicates the problem is mechanical in nature When this code exists diagnosing the transmission should be based on the associated gear ratio code and primarily mec
17. VER 1 No GoTo 6 If there are no possible causes remaining view repair Repair Repair internal transmission problem If the transmission is to be repaired check all of the components related to the Underdrive and 2 4 clutches Inspect the pump per service information and repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 54 TRANSMISSION Symptom P0O733 GEAR RATIO ERROR IN 3RD When Monitored and Set Condition 0733 RATIO ERROR IN When Monitored The Transmission Gear Ratio is monitored continuously while the Transmission is in Gear Set Condition If the ratio of the input RPM to the output RPM does not match the current Gear Ratio POSSIBLE CAUSES RELATED DTC S PRESENT RELATED PRESSURE SWITCH DTC S PRESENT INTERMITTENT GEAR RATIO ERRORS TRANSMISSION INTERNAL ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTC s Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC
18. 57 K39 18VT DG 2 4L IDLE AIR CONTROL NO 1 DRIVER 57 1 3 3L 3 8L IDLE AIR CONTROL NO 2 DRIVER 58 K59 18BR DG 2 4L IDLE AIR CONTROL NO 4 DRIVER 59 D25 18WT VT PCI BUS 60 61 F855 18PK YL 5 VOLT SUPPLY 62 B29 18DG WT BRAKE SWITCH SENSE 63 T10 18DG LG 3 3L 3 8L TORQUE MANAGEMENT REQUEST SENSE 64 C13 18LB OR AIC COMPRESSOR CLUTCH RELAY CONTROL 65 021 18WT BR SCI TRANSMIT 66 N7 18DB OR VEHICLE SPEED SENSOR OUTPUT 67 K51 18BR WT AUTOMATIC SHUTDOWN RELAY CONTROL 68 K52 18DB WT EVAPORATIVE EMISSION SOLENOID CONTROL 69 70 18DB BR EVAPORATIVE EMISSION SOLENOID SENSE 71 72 K107 18VT WT LEAK DETECTION PUMP SWITCH SENSE 73 173 18BR VT RADIATOR FAN RELAY CONTROL K81 1888 FUEL PUMP RELAY CONTROL 75 020 18WT LG SCI RECEIVE 76 741 18YL DB PARK NEUTRAL POSITION SWITCH SENSE TRS T41 77 K106 18VT LB LEAK DETECTION PUMP SOLENOID CONTROL 78 K54 18DB WT 2 4L TORQUE CONVERTER CLUTCH SOLENOID CONTROL 79 80 V35 18VT OR SPEED CONTROL VENT SOLENOID CONTROL RIGHT REAR LAMP ASSEMBLY BLACK 6 WAY CAV CIRCUIT FUNCTION 1 162 18WT BR RIGHT REAR TURN SIGNAL DRIVER 2 3 L78 18WT OR FUSED RIGHT PARK LAMP RELAY OUTPUT 4 L1 18WT LG BACK UP LAMP DRIVER 5 7362 18BK BR GROUND 6 160 18WT TN BRAKE LAMP SWITCH OUTPUT 172 CONNECTOR PINOUTS SOLENOID PRESSURE SWITCH ASSEMBLY 3 3L 3 8L BLACK 8 WAY CAV CIRCUIT FUNC
19. Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector the IPM Ignition on engine not running Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit in the Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes gt GoTo 7 No Repair the Transmission Control Relay Output circuit for an open or high resistance Perform 41 TRANSMISSION VERIFICATION TEST VER 1 64 TRANSMISSION P0750 LR SOLENOID CIRCUIT continued ACTION APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Measure the resistance of the L R Solenoid Control circuit from the TCM harness connector to the Solenoid Pressure Switch Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the L R Solenoid Control circuit for an open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 8 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Mea
20. Is the STARTS SINCE SET counter 2 or less Yes gt GoTo 5 No GoTo 13 115 TRANSMISSION P1787 OD HYDRAULIC PRESSURE TEST FAILURE Continued APPLICABILITY Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Note Check connectors Clean repair as necessary On the Transmission Simulator select OD on the Pressure Switch selector switch With the DRBIII9 monitor the OD Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator Wiggle the wires leading to the TCM while pressing the button Did the O D Pressure Switch state change to closed and remain closed while wiggling the wires Yes GoTo 6 No GoTo 8 The Transmission must be above 21 C or 70 F prior to checking fluid level Adjusting fluid level on a cold transmission will result in an overfilled transmission Check the Transmission Fluid Level per the Service Information Is the fluid level OK Yes GoTo 7 No Adjust fluid level Repair cause of incorrect fluid level Perform 41 TRANSMISSION VERIFICATION TEST VER 1 and repair or replace as necessary If no problems are found in the valve body replace the Transmission Solenoid Pressure Switch Assembly per the Service Information Perfo
21. Miller tool 8333 1 Ignition on engine not running With the DRBIII actuate the 2 4 Solenoid Monitor the 2 4 Solenoid LED on the Transmission Simulator Miller tool 8333 Did the 2 4 Solenoid LED on the Transmission Simulator blink on and off during actuation Yes GoTo 5 GoTo 6 If there are no possible causes remaining view repair Repair Replace the Transmission Solenoid Pressure switch assembly Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused B and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit in the Transmission Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes gt GoTo 7 No Repair the Transmission Control Relay Output circuit for an open or high resistance Perform 41 TRANSMISSION VERIFICATION TEST VER 1 67 TRANSMISSION P0755 2 4 SOLENOID CIRCUIT C
22. PCI BUS SIGNAL PCI BUS SICNAL TRANSMISSION RANGE SENSOR TRS THROTTLE POSITION SENSOR SIGNAL 5 VOLT SUPPLY THROTTLE POSITION SENSOR SIGNAL TRANSMISSION TEMPERATURE TRANSMISSION TEMPERATURE SENSOR SENSOR SENSOR GROUND GEARS LISTED CLOSE SWITCH SENSE SIGNAL CZ to TRS 1 SENSE SENSOR GROUND CRANKSHAFT POSITION SENSOR SIGNAL 8 VOLT SUPPLY T3 SENSE SIGNAL C3 TRS T3 SENSE C3 T42 SENSE SIGNAL C2 TRS T42 SENSE C2 CRANKSHAFT POSITION SENSOR T41 SENSE SIGNAL C1 TRS T41 SENSE C1 VEHICLE SPEED SENSOR SIGNAL P N POSITION SWITCH SENSE 141 POSITION SENSOR SIGNAL VEHICLE SPEED SENSOR SIGNAL TORQUE MANAGEMENT REQUEST SENSE TORQUE MANAGEMENT REQUEST SENSE P N POSITION SWITCH SENSE T41 777 80babeb06 S H C R 5 178 NOTES 179 NOTES 180
23. TRANSMISSION P0765 UD SOLENOID CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the UD Solenoid Control circuit from the TCM harness connector to the Transmission Solenoid Pressure Switch Assembly harness connec tor Is the resistance above 5 0 ohms Yes Repair the UD Solenoid Control circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 8 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the UD Solenoid Control circuit Is the resistance below 5 0 ohms Yes Repair the UD Solenoid Control circuit for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 9 Measure the voltage of the UD Solenoid Control circuit in the harness connector Is the voltage above 0 5 volt Yes Repair the UD Solenoid Control circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 10 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM
24. Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 55 TRANSMISSION PO733 GEAR RATIO ERROR IN Continued ACTION APPLICABILITY With the DRBIII9 read Transmission DTC s If any of these DTC s are present perform their respective tests first Are DTC s P1791 P0715 P0720 P1794 P1720 present also Yes Refer to appropriate symptom in the Transmission category If any of these DTC s are present they will cause a gear ratio error Go to test for P1791 first if it is present Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 NOTE Low fluid level can be the cause of many transmission problems Check and adjust the fluid level per the Service Information With the DRBIII9 perform the 3rd gear clutch test Follow the instructions on the DRBIII Increase the throttle angle TPS Degree to 30 for
25. When in AutoStick mode the instrument cluster displays the current gear GENERAL INFORMATION 3 2 2 TRANSMISSION OPERATION AND SHIFT SCHEDULING AT VARIOUS OIL TEMPERATURES The transmission covered in this manual has unique shift schedules depending on the tempera ture of the transmission oil The shift schedule is modified to extend the life of the transmission while operating under extreme conditions The oil temperature is measured with a Temper ature Sensor on the 41 transmission The Temperature Sensor is an integral component of the Transmission Range Sensor TRS If the Tempera ture Sensor is faulty DTC P1799 74 the trans mission will default to a calculated oil temperature Oil temperature will then be calculated through a complex heat transfer equation which uses engine coolant temperature battery ambient temperature and engine off time from the Body Control Module These inputs are received from the PCI bus periodically and used to initialize the oil tempera ture at start up Once the engine is started the TCM updates the transmission oil temperature based on torque converter slip speed vehide speed gear and engine coolant temperature to determine an estimated oil temperature during vehide opera tion Vehides using a calculated oil temperature track oil temperature reasonably accurate during normal operation However if a transmission is overfilled a transmission oil cooler becomes r
26. Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 145 TRANSMISSION Symptom BRAKE SHIFT INTERLOCK OUTPUT OPEN POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS BRAKE SHIFT INTERLOCK CONTROL CIRCUIT OPEN BRAKE SHIFT INTERLOCK FEED CIRCUIT OPEN BRAKE SHIFT INTERLOCK SOLENOID FRONT CONTROL MODULE APPLICABILITY Ignition on engine not running With the DRBIII record and erase Turn the ignition off to the lock position Turn the ignition on With the DRBIII9 read DTCs Does the DRBIII9 display BRAKE SHIFT INTERLOCK OUTPUT OPEN Yes gt GoTo 2 No GoTo 8 Turn the ignition off to the lock position Disconnect the Brake Shift Interlock harness connector Note Check connectors Clean repair as necessary Ignition on engine not running Using 12 volt test light connected to B check the Brake Shift Interlock Control circuit in the Brake Shift Interlock harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes GoTo 3 No GoTo 6 Turn the ignition off to the lock position Disconnect the Brake Shift Interlock harness connector Note Check connectors Clean repair as necessary Ignition on engine not
27. continued ACTION APPLICABILITY Ignition on engine not running With the DRBIII read Transmission Control Module DTC s Are there any Transmission Control Relay related DTC s P1765 P1767 or P1768 present Yes Refer to symptom list and perform the appropriate symptom for Transmission Control Relay related DTC s Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set 15 the STARTS SINCE SET counter for P0750 set at 0 Yes GoTo 4 No GoTo 11 Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Ignition on engine not running With the DRBIII actuate the L R Solenoid Monitor the L R Solenoid LED on the Transmission Simulator 8333 Did the L R Solenoid LED on the Transmission Simulator blink on and off during actuation Yes GoTo 5 No GoTo 6 If there are no possible causes remaining view repair Repair Replace the Transmission Solenoid Pressure switch assembly Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the Transmission Solenoid Pressure Switch harness connector Remove the Transmission Control Relay from the IPM Note
28. 2 4 SOLENOID CONTROL OD SWITCH SENSE Lee OD SOLENOID CONTROL GROUND 2 UD SOLENOID CONTROL GROUND SLL GROUND UR PRESSURE SWITCH SENSE 2 4 PRESSURE SWITCH SENSE OD PRESSURE SWITCH SENSE TRANSMISSION CONTROL RELAY OUTPUT TRANSMISSION CONTROL RELAY OUTPUT FCM OUTPUT UNLOCK RUN START TRANSMISSION CONTROL RELAY CONTROL FUSED IGNITION SWITCH OUTPUT START INPUT SPEED SENSOR SIGNAL FUSED B OUTPUT SPEED SENSOR SIGNAL AS OD MUX SPEED SENSOR GROUND THROTTLE POSITION SENSOR SIGNAL TRANSMISSION TEMPERATURE SENSOR SENSOR GROUND T1 SENSE SIGNAL C4 VEHICLE SPEED SENSOR SIGNAL PCI BUS SIGNAL T3 SENSE SIGNAL C3 EATX RPM SIGNAL T42 SENSE SIGNAL C2 TORQUE MANAGEMENT REQUEST SENSE T41 SENSE SIGNAL C1 46 ON MOUNTING BRACKET 13 54 42 41 TO DATA LINK CONNECTOR DLC BACKUP LAMPS BODY CONTROL MODULE TRS REVEHSE SENSE C3 4 C7 3 PCI BUS C3 2 FCM OUTPUT UNLOCK RUN START C33 FUSED IGNITION OUTPUT START OUTPUT SPEED SENSOR INPUT SPEED SENSOR TRANSMISSION RANGE SENSOR TRS TRS REVERSE SENSE 6 TRANSMISSION TEMPERATURE 4 SENSOR GEARS LISTED CLOSE SWITCH 7 Loo TRS SENSE C4 NDL H TRS SENSE P3L PRNL TRS T42 SENSE C2 10 om PN 77 TRS T41 SENSE C1 P N POSITION SWITCH SENSE T41 76 177 5 H P
29. 57 at speeds above 72 Km h 45 MPH The appropriate code is set EMCC is aborted and current gear is maintained If while still traveling above 72 Kmyh 45 MPH the gear ratio becomes valid again EMCC will reengage and normal oper ation will resume If the gear ratio becomes intermittent and recovers three times in a given key start the current gear will be main tained and EMCC inhibited then the trans mission will go into relay open limp in mode if throttle is applied below 72 Km h 45 MPH at 35 Km h 22 MPH with closed throttle Codes 51 52 53 54 56 and 57 at speeds between 35 and 72 Km h 22 and 45 MPH If one of these codes is set between 35 and 72 Kmyh 22 and 45 MPH the current gear will be maintained until the gear ratio problem corrects itself If throttle is applied the trans will go to 2nd gear If this happens and the gear ratio problem goes away normal opera tion will resume If three gear ratio problems are identified in a given key start the current gear will be frozen until throttle is applied The transmission will then go into relay open limp in mode with throttle applied at speeds between 35 and 72 Km h 22 and 45 MPH Codes 51 52 53 54 56 and 57 at speeds below 35 Km h 22 MPH If a gear ratio problemis identified below 35 K m h 22 M PH the transmission will immediately substitute second gear for the current gear If the gear ratio problem goes away normal operation
30. 81 GRAY 2 168 PARK NEUTRAL POSITION SWITCH 2 4L BLACK 3 WAY 168 FUSES 170 TRANSMISSION SAFETY SHUTDOWN RELAY 170 POWERTRAIN CONTROL MODULE C1 GRAY BLACK 40 171 POWERTRAIN CONTROL MODULE C2 GRAY GRAY 40 WAY 172 RIGHT REAR LAMP ASSEMBLY BLACK 6 172 SOLENOID PRESSURE SWITCH ASSEMBLY 3 3L 3 8L BLACK 8 WAY 173 THROTTLE POSITION SENSOR GRAY 3 173 TORQUE CONVERTER CLUTCH SOLENOID 2 4L BLACK 3 WAY 173 TRANSMISSION CONTROL MODULE 3 3L 3 8L BLACK 60 WAY 174 TRANSMISSION RANGE SENSOR 3 3L 3 8L GRAY 10 175 SCHEMATIC DIAGRAMS a v E 177 NOTES 1 0 INTRODUCTION The procedures contained in this manual indude all of the specifications instructions and graphics needed to diagnose 41TE AE Electronic Automatic Transaxle EAT X problems The diagnostics in this manual are based on the failure condition or symp tom being present at the time of diagnosis When repairs are required refer to the appropri ate volume of the service manual for the proper removal and repair procedure Diagnostic procedures change every year New diagnostic systems may be added and or carryover systems may be enhanced READ THIS MANUAL BEFORE TR
31. APPLICABILITY If there are no possible causes remaining view repair All Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 135 TRANSMISSION Symptom P1796 AUTOSTICK SENSOR CIRCUIT POSSIBLE CAUSES VERIFY AUTOSTICK OPERATION WITH SWITCH IN THE DOWN POSITION VERIFY AUTOSTICK OPERATION WITH SWITCH IN THE UP POSITION VERIFY OD OFF SWITCH OPERATION INTERMITTENT OPERATION AUTOSTICK OD OFF MUX INPUT CIRCUIT OPEN AUTOSTICK OD OFF SWITCH ASSEMBLY GROUND CIRCUIT OPEN AUTOSTICK OD OFF MUX INPUT CIRCUIT SHORT TO GROUND AUTOSTICK OD OFF MUX INPUT CIRCUIT SHORT TO VOLTAGE TCM AUTOSTICK INPUT CIRCUIT ACTION APPLICABILITY With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter for P1796 set at 0 Yes 2 GoTo 11 Turn the ignition on Select the Autostick position with the gear selector With the DRBIII9 observe the Autostick switch voltage NOTE Do not press any Autostick switches while reading the voltage 15 the voltage between 3 8 4 8 volts Yes GoTo 3 No GoTo 6 Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition on Select the Autostick position with the gear selector With the DRBIII observe the Autostick switch voltage Push the Autostick up switch Is the voltage between 1 6 2 8 vol
32. Adjust fluid level and repair cause of incorrect fluid level Place vehide on hoist WARNING BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING WHEELS Run vehide on hoist under conditions necessary to duplicate the noise NOTE It may be necessary to test drive the vehicle to duplicate the noise Using Chassis Ears or other suitable listening device verify the source of the noise 15 the noise coming from the transmission Yes gt GoTo 3 No Test Complete Does the noise get louder or change pitch while the engine speed is changing Yes gt GoTo 4 GoTo 5 If there are no possible causes remaining view repair Repair Repair internal transmission problem as necessary Inspect all of the transmission components for signs of wear If no problems found replace the Transmission oil pump If there are no possible causes remaining view repair Repair Repair internal transmission problem as necessary Inspect all of the transmission components for signs of wear Pay particular attention to bearings pinion gears etc Repair or replace as necessary With the shift lever in neutral raise the engine speed and listen to the noise All NOTE THE RADIO MUST BE TURNED OFF Alternator noise can come through the speakers and be misinterpreted as Transmission Pump Whine This can happen even with the volume turned down 154 TRANSMISSION Symptom TRANSMISSION SHIFTS EARLY WITH NO DTC S POSSIBLE CAUSES BUS PROBL
33. COMMUNICATION 130 P1 94 SPEED SENSOR GROUND ERROR etr E Rr Leng 133 Figo INTERNAL TOM iur aero Gb ede ER eda Mya Ge eRe ee 135 P1796 AUTOSTIGK SENSOR CIRCUIT RA RR 136 P1797 MANUAL SHIFT OVERHEAT RARE 139 P1798 WORN OUT BURNT TRANSAXLE FLUID 140 P1799 GALCULATED OIL TEMP IN USE Seen XR Ew Rm 142 BRAKE SHIFT INTERLOCK OUTPUT OPEN kx TERREA EX TP Pr 146 CHECKING PARK NEUTRAL SWITCH OPERATION 148 INGORREGT TRANSMISSION FLUID LEVEL 422 150 BACK UP LAMP OPERATION facet ere EE ER xs 151 NO SPEEDOMETER OPERATION 1 0 OR ERAT 153 TRANSMISSION NOISY WITH NO DTC S 154 8 0 9 0 10 0 TABLE OF CONTENTS Continued TRANSMISSION SHIFTS EARLY WITH 8 155 TRANSMISSION SIMULATOR 8333 WILL NOT POWER UP 156 VERIFICATION TESTS VERIFICATION 8 6 157 COMPONENT 6 159 81 POWERTRAIN CONTROL 159 8 2 TRANSMISSION CONTROL 159 8 3 INTELLIGE
34. Clean repair as necessary Ignition on engine not running On the Transmission Simulator select OD on the Pressure Switch selector switch With the DRBIII monitor the OD Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator Did the Pressure Switch state change from OPEN to CLOSED when the test button was pressed Yes gt GoTo 5 No GoTo 6 If there are no possible causes remaining view repair Repair Replace Transmission Solenoid Pressure Switch Assembly per the Service Information Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused B circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector the IPM Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit in the Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes gt GoTo 7 No Repair the Transmission Control Relay Output circuit for an open or high resistance Perform 41TE TRANSMISSION VERIFICATION TEST
35. DB TRS T3 SENSE 4 5 6 18BR LB CRANKSHAFT POSITION SENSOR SIGNAL 7 021 18WT BR SCI TRANSMIT 8 1751 18YL IGNITION SWITCH OUTPUT START 9 18DG TN OVERDRIVE PRESSURE SWITCH SENSE 10 710 18DG LG TORQUE MANAGEMENT REQUEST SENSE 1 Ft 18PK WT FCM OUTPUT UNLOCK RUN START 12 K22 18BR OR THROTTLE POSITION SENSOR SIGNAL 1 T13 18DG VT SPEED SENSOR GROUND 14 14 18DG BR OUTPUT SPEED SENSOR SIGNAL 15 115 18YL BR TRANSMISSION SAFETY SHUTDOWN RELAY CONTROL 16 T16 18YL OR TRANSMISSION SAFETY SHUTDOWN RELAY OUTPUT 17 716 18YL OR TRANSMISSION SAFETY SHUTDOWN RELAY OUTPUT 18 19 19 18YL DB 2 4 SOLENOID CONTROL 20 T20 18DG WT LOW REVERSE SOLENOID CONTROL 21 22 23 24 25 26 27 28 29 30 81 32 33 34 35 36 37 38 39 40 41 T41 18DG GY TRS T41 SENSE 42 42 18DG YL TRS T42 SENSE 43 1025 18WT VT PCI BUS 44 45 46 1016 18WT OR SCI RECEIVE 47 T47 18YL DG 2 4 PRESSURE SWITCH SENSE 48 49 50 50 18YL TN LOW REVERSE PRESSURE SWITCH SENSE 51 900 18DB DG SENSOR GROUND 52 T52 18DG WT INPUT SPEED SENSOR SIGNAL 53 7132 16BK YL GROUND 54 T54 18DG OR TRANSMISSION TEMPERATURE SENSOR SIGNAL 55 755 18YL VT AUTOSTICK AUTOSTICK OVERDRIVE OFF MUX INPUT 56 104 18YL RD FUSED B 57 2133 16BK LG GROUND 58 N7 18DB OR VEHICLE SPEED SENSOR SIGNAL 59 59 18YL LB UNDERDRIVE SOLENOID CONTROL 60 60 18YL GY OVERDRIVE SOLENOID CONTROL 174 TRANSMISS RANGE S
36. N POSITION SWITCH SENSE T41 80b38ebc S H C R 5 SCHEMATIC DIAGRAMS 41TE TRANSMISSION RS 3 3 3 8 ONLY TRANSMISSION TRANSMISSION CONTROL MODULE TCM SOLENOID PRESSURE SWITCH ASSEMBLY SCI RECEIVE 4 TO DATA LINK CONNECTOR DLC SOLENOID CONTROL SCI TRANSMIT 4 SOLENOID CONTROI OD SOLENOID CONTROL UD SOLENOID CONTROL 7 CASE GROUND ON MOUNTING BRACKET L R PRESSURE SWITCH SENSE BACKUP LAMPS n 2 4 PRESSURE SWITCH SENSE OD PRESSURE SWITCH SENSE BODY CONTROL MODULE TRANSMISSION CONTROL RELAY OUTPUT TRS REVERSE SENSE TRANSMISSION CONTROL RELAY OUTPUT ETE ics IPM Er FCM OUTPUT UNLOCK RUN START 11 2 FCM OUTPUT UNLOCK RUN START boH cas TRANSMISSION CONTROL RELAY CONTROL TRANSMISSION L CONTROLRELAY T FUSED IGNITION SWITCH OUTPUT START C3 3 FUSED IGNITION OUTPUT START Em 85 c1 l 1 FUSED 86 INPUT SPEED SENSOR SIGNAL e FUSED oe ee cere OUTPUT SPEED SENSOR SIGNAL 2 AS OD MUX AUTOSTICK SWITCH MUX OUTPUT SPEED SENSOR INPUT SPEED SENSOR POWERTRAIN CONTROL MODULE PCM SPEED SENSOR GROUND e
37. No Repair the P N Position Switch Sense circuit for an open Note Check connectors Clean repair as necessary Measure the resistance between ground and the P N Position Switch Sense circuit Is the resistance above 100k ohms Yes GoTo 4 No Repair the P N Position Switch Sense circuit for a short to ground Turn the ignition off Disconnect the PCM harness connectors Move the Gear selector through all gear positions from Park to 1st and back While moving the gear selector through each gear measure the resistance between ground and the P N Position Switch Sense circuit Did the resistance change from above 10 0 ohms to below 10 0 ohms Yes gt GoTo 5 3 Turn the ignition off All Disconnect the PCM harness connectors Disconnect the Transmission Range Sensor harness connector No Replace the Transmission Range Sensor 148 TRANSMISSION CHECKING PARK NEUTRAL SWITCH OPERATION Continued ACTION APPLICABILITY If there are no possible causes remaining view repair Repair Replace and program the Powertrain Control Module in accor dance with the Service Information Perform POWERTRAIN VERIFICATION TEST VER 2 149 TRANSMISSION Symptom INCORRECT TRANSMISSION FLUID LEVEL POSSIBLE CAUSES INCORRECT FLUID LEVEL ACTION APPLICABILITY The transmission must be above 70 degree prior to checking fluid level Adjusting fluid level on a cold transmission will result i
38. Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 4 Turn ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Ignition on engine not running Usingthe Transmission Simulator set the selector switch to the 3000 1250 position Turn the Input Output switch to ON With the DRBIII9 read the Input and Output Speed Sensor RPM Does the Input Speed read 3000 RPM and the Output Speed read 1250 RPM within 50 RPM Yes GoTo 5 GoTo 5 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the TRS harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Input Speed Sensor Ground circuit from the TCM harness connector to the Speed Sensor harness connector Is the resistance above 5 0 ohms Yes Repair the Speed Sensor Ground circuit for an open or high resistance Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 6 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 134 TRANSMISSION Symptom P1795 INTERNAL TCM POSSIBLE CAUSES TCM INTERNAL ERROR ACTION
39. Relay Output circuits Two are located in the TCM harness connector and one located in the Transmission Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly on all three Transmission Control Relay Output circuits Yes gt GoTo 7 No Repair the Transmission Control Relay Output circuit for an open or high resistance Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Measurethe resistance between ground and the Transmission Control Relay Output circuit Is the resistance below 5 0 ohms Yes Repair the Transmission Control Relay Output circuit for a short to ground Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 8 Turn the ignition off to the lock position Disconnect the TCM harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Measure the resistance between ground and the Transmission Relay Control circuit Is the resistance below 5 0 ohms Yes Repair the Transmission Control Relay Control circuit for a short to
40. SENSE CIRCUIT OPEN 2 4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND 2 4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE 2 4 PRESSURE SWITCH TCM 2 4 PRESSURE SWITCH CIRCUIT APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIIIS read the engine Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 107 TRANSMISSION P1782 2 4 PRESSURE
41. Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 100 TRANSMISSION P1776 SOLENOID SWITCH VALVE LATCHED IN LR POSITION Continued ACTION APPLICABILITY With the DRBIII check for other Transmission DTCs Is the DTC P1784 present also Yes Refer to symptom list and perform test for DTC P1784 Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 3 Perform a visual inspection of all connectors wiring and cooler connections before proceeding Repair as necessary With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter 2 or less Yes gt GoTo 4 No GoTo 12 Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Ignition on engine not running On the Transmission Simulator select L R on the Pressure Switch selector switch Wi
42. Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the OD Solenoid Control circuit Is the resistance below 5 0 ohms Yes Repair the OD Solenoid Control circuit for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 9 Ignition on engine not running Measure the voltage of the OD Solenoid Control circuit in the TCM harness connector 15 the voltage above 0 5 volt Yes Repair the OD Solenoid Control circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 10 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as ne
43. TEST VER 1 Turn the ignition off to the lock position Disconnect the TRS harness connector Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistance of the TRS Sense circuit from the harness connector to the TRS harness connector Is the resistance above 5 0 ohms Yes Repair the TRS Sense circuit for an open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 12 Turn the ignition off to the lock position Disconnect the TRS harness connector Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the TRS T3 Sense circuit in the TCM harness connector Is the resistance below 5 0 ohms Yes Repair the TRS Sense circuit for a short to ground Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 13 34 TRANSMISSION 705 SHIFTER SIGNAL Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TRS harness connector Disconnect the TCM harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage o
44. The PCM will acknowledge the TCM request by sending a mes sage across the PCI bus within a specific amount of time The TRD Link communication is also tested periodically for operation whenever the engine is running and the vehide is not moving with zero degrees throttle Transmission Effects Maximum throttle angle used by TCM will be 54 degrees As a result a customer my complain about loss of performance or of short shifting when driving aggressively Possible Causes gt Sticky Throttle Position Sensor TPS gt Wiring or Connector problems in the Torque Management Request Sense Circuit gt PCM gt Name of code P0736 50 Gear Ratio Error in Reverse P0731 51 Gear Ratio Error in 1st P0732 52 Gear Ratio Error in 2nd P0733 53 Gear Ratio Error in 3rd P0734 54 Gear Ratio Error in 4th P0715 56 Input Speed Sensor Error P0720 57 Output Speed Sensor Error 1794 58 Speed Sensor Ground Error When monitored The transmission gear ratio is monitored continuously whilethetransmission is in gear Set condition This code is set if the gear ratio is not correct for a period of time Codes 50 through 54 sets if the ratio of the input RPM Nt to the output RPM No does not match the given gear ratio Code 56 sets if there is an excessive change in input RPM in any gear Code 57 sets if there is an excessive change in output RPM in any gear Cod
45. VER 1 105 TRANSMISSION P1781 OD PRESSURE SWITCH SENSE CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the O D Pressure Switch Sense circuit from the TCM harness connector to the Transmission Solenoid Pressure Switch Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the O D Pressure Switch Sense circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 8 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the O D Pressure Switch Sense circuit Is the resistance below 5 0 ohms Yes Repair the O D Pressure Switch circuit for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 9 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circui
46. WINDOWS 9 A115 12YL RD POWER FUSED B U LIFTGATE 10 F302 18GY PK FUSED ACCESSORY RELAY OUTPUT RUN ACC 5 BLACK LEFT REAR LAMP ASSEMBLY BLACK 6 WAY CIRCUIT FUNCTION 5 EE 1 1163 LEFT REAR TURN SIGNAL DRIVER 2 162 18WT BR RIGHT REAR TURN SIGNAL DRIVER 6 rur 177 18WT BR FUSED LEFT PARK LAMP RELAY OUTPUT 4 11 18WT LG BACK UP LAMP DRIVER LEFT REAR 5 7363 18BK DG GROUND LAMP ASSEMBLY 6 150 18WT TN BRAKE LAMP SWITCH OUTPUT 167 CONNECTOR PINOUTS OUTPUT SPEED SENSOR 3 3L 3 8L GRAY 2 WAY 2 1 CIRCUIT FUNCTION OUTPUT 1 T13 18DG VT SPEED SENSOR GROUND SPEED 2 T14 18DG BR OUTPUT SPEED SENSOR SIGNAL SENSOR 3 31 3 81 BLACK PARK NEUTRAL POSITION SWITCH 2 4L BLACK 3 WAY C29 CAV o N N o R u dcOoz c 168 CIRCUIT FUNCTION 4 7252 18BK WT GROUND PARK NEUTRAL 2 41 18YL DB PARK NEUTRAL POSITION SWITCH TRS T41 POSITION 16DGWT TRS REVERSE SENSE SWITCH 2 4L SPARE FRONT LAMP RELA Y REAR WINDOW DEFOGGER RELA Y REAR BLOWER MOTOR RELA Y ACCESSORY RELA Y FRONT WIPER HIGH LOW RELAY STARTER MOTOR RELAY AUTOMATIC SHUTDOWN RELAY INTELLIGENT POWER MODULE FRONT VIEW 3
47. When Monitored During an attempted shift into 1st gear Set Condition This DTC is set if three unsuccessful attempts are made to shift into 1st gear in one given ignition start POSSIBLE CAUSES INCORRECT FLUID LEVEL RELATED DTC P1784 PRESENT INTERMITTENT OPERATION TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN L R PRESSURE SWITCH SENSE CIRCUIT OPEN L R PRESSURE SWITCH CIRCUIT SHORT TO GROUND L R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE INTERNAL TRANSMISSION SOLENOID SWITCH VALVE STUCK TCM SOLENOID SWITCH VALVE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine DTC s prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that a
48. a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 66 TRANSMISSION P0755 2 4 SOLENOID CIRCUIT Continued ACTION APPLICABILITY With the DRBIII read Transmission Control Module DTC s Are there any Transmission Control Relay related DTC s P1765 P1767 or P1768 present Yes Refer to symptom list and perform the appropriate symptom for Transmission Control Relay related DTC s Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 With the DRBIII Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter for P0755 set at 0 Yes gt GoTo 4 No GoTo 11 Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit
49. also Yes Refer to symptom list and perform test for P1791 Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 3 With the DRBIII9 read Transmission Is the DTC P0732 P0734 and or P1782 present also Yes Replace the Transmission Solenoid Pressure switch assembly Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 4 With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter 2 or less Yes gt GoTo 5 No GoTo 13 119 TRANSMISSION P1788 2 4 HYDRAULIC PRESSURE TEST FAILURE Continued ACTION APPLICABILITY Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Note Check connectors Clean repair as necessary Ignition on engine not running On the Transmission Simulator select 2 4 on the Pressure Switch selector switch With the DRBIII9 monitor the 2 4 Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator Wiggle the wiring leading to the TCM while pressing the button Did the 2 4 Pressure Switch state change to closed and remain closed while wiggling the wires Yes 6 GoTo 8 The Transmission must be above 70 degree F prio
50. at the Transmission Control Module when the TCM is energizing the relay POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS FUSED B CIRCUIT OPEN TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN TRANSMISSION RELAY CONTROL CIRCUIT OPEN TRANSMISSION CONTROL RELAY GROUND CIRCUIT OPEN TRANSMISSION CONTROL RELAY STUCK OPEN TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORT TO GROUND TRANSMISSION RELAY CONTROL CIRCUIT SHORT TO GROUND TCM TRANSMISSION CONTROL RELAY ALWAYS OFF APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTC s Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash le
51. circuit is tested again to verify the failure In addition to the periodic testing the solenoid circuits are tested if a speed ratio or pressure switch error occurs In this case one failure will result in the appropriate code being set Transmission Effects The MIL will illuminate and the transmission goes into neutral if code is set above 35 22 MPH limp in mode when vehicle speed is below 35 Km h 22 MPH Possible causes gt Open or shorted solenoid circuit s between and solenoid pack gt Open ground circuit gt connector problems gt Solenoid pack connector problem gt Solenoid Pack gt Name of code P1776 47 Solenoid Switch Valve SSV Latched in L R Position When monitored Continuously when doing par tial or full EMCC PEMCC or FEMCC Set condition f the transmission senses the L R pressure switch closing while performing PEMCC or FEMCC This code will be set after two unsuc cessful attempts to perform PEMCC or FEMCC Theory of operation The solenoid switch valve SSV controls the direction of the transmission fluid when the L R TCC solenoid is energized SSV will be in the downshifted position in 1st gear thus directing the fluid tothe L R dutch circuits 2nd 3rd and 4th the SSV will be in the upshifted position and directs the fluid into the torque con verter clutch TCC When doing PEMCC theL R pressure switch should indicate pressu
52. each gear position Watch for one of the circuits to not change state 33 TRANSMISSION 705 SHIFTER SIGNAL Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TRS harness connector Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistance between the TRS T1 Sense circuit at the TCM connector and ground Is the resistance below 5 0 ohms Yes Repair the TRS Sense circuit for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 9 Turn the ignition off to the lock position Disconnect the TRS harness connector Disconnect the TCM harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the TRS T1 Sense dircuit at the TCM harness connector 15 the voltage above 0 5 volt Yes Repair the TRS 1 Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 10 If there are no possible causes remaining view repair Repair Replace the WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION
53. gear Set Condition If there is an excessive change in input RPM in any gear POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS INPUT SPEED SENSOR SIGNAL CIRCUIT OPEN SPEED SENSOR GROUND CIRCUIT OPEN INPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND INPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGE INPUT SPEED SENSOR ERROR TCM INPUT SPEED SENSOR ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIIIS read the engine Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software
54. ground Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 9 94 TRANSMISSION P1768 RELAY OUTPUT ALWAYS OFF Continued APPLICABILITY Turn the ignition off to the lock position Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Install a substitute Relay in place of the Transmission Control Relay Note Check connectors Clean repair as necessary Ignition on engine not running With the DRBIII actuate the Transmission Control Relay Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit Does the test light blink on and off Yes Test Complete Replace the Transmission Control Relay Perform 41 TRANSMISSION VERIFICATION No Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 95 TRANSMISSION Symptom P1775 SOLENOID SWITCH VALVE LATCHED IN TCC POSITION When Monitored and Set Condition P1775 SOLENOID SWITCH VALVE LATCHED IN TCC POSITION
55. ground and the OD Pressure Switch Sense circuit in the Transmission Solenoid Pressure Switch Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the O D Pressure Switch Sense circuit for an open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 10 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the OD Pressure Switch Sense circuit Is the resistance below 5 0 ohms Yes Repair the OD Pressure Switch Sense circuit for a short to ground Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 11 Ignition on engine not running Measure the voltage of the OD Pressure Switch Sense circuit in the TCM harness connector Is the voltage above 0 5 volt Yes Repair OD Pressure Switch Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 12 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while che
56. guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete Remove and inspect the Transmission Oil Pan and Transmission Oil Filter per the Service Information Does the Transmission Oil Pan contain excessive debris and or is the Oil Filter plugged Yes Repair the cause of plugged Transmission Oil Filter Refer to the Service I nformation for repair procedures Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 7 With the DRBIII9 perform Shift Lever Position test Follow the instructions on the DRBIII Did the Shift Lever Position Test pass Yes GoTo 8 No Refer to symptom list and perform test for DTC P0705 Perform 41 TRANSMISSION VERIFICATION TEST VER 1 125 TRANSMISSION P1791 LOSS OF PRIME Continued ACTION APPLICABILITY If there are no possible causes remaining view repair All Repair Replace the Transmission Oil Pump per the Service Information Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 126 TRANSMISSION Symptom P1792 BATTERY WAS DISCONNECTED When Monitored and Set Condition P1792 BATTERY WAS DISCONNECTED When Monitored Whenever the key is in the Run Start position Set Condition This code is set whenever Transmission Control Module
57. necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the used B circuit and Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the 2 4 Solenoid Control circuit in the harness connector No Test Complete 68 TRANSMISSION Symptom 760 SOLENOID CIRCUIT When Monitored and Set Condition P0760 OD SOLENOID CIRCUIT When Monitored Initially at power up then every 10 seconds thereafter They will also be tested immediately after a Gear Ratio or Pressure Switch error is detected Set Condition Three consecutive solenoid continuity test failures or one failure if test is run in response to a Gear Ratio or Pressure Switch error POSSIBLE CAUSES RELATED RELAY DTC S PRESENT INTERMITTENT WIRING AND CONNECTORS TRANSMISSION CONTRO
58. symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 61 TRANSMISSION 740 CONVERTER CLUTCH CONTROL CIRCUIT Continued ACTION APPLICABILITY Ignition on engine not running With the DRBIII9 read Transmission DTC s Arethe DTCs P0750 and or P1784 present also Yes Refer to symptom list for problems related to DTC P0750 and or P1784 Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 Ignition on engine not running With the DRBIII record and erase Transmission DTCs Drive the vehicle until it is fully warmed up to at least 43 33 C or 110 F Perform the following steps 3 times With the DRBIII9 monitor TPS degree Drive the vehicle to the speed of 83 45 Km h or 50 MPH and allow 4th gear to engage for at least 10 seconds Close the throttle then tip back in until the throttle angle TPS degrees is between 25 and 29 degrees NOTE If you go over 30 TPS degrees you must back off of the throttle and retry Did the TCC engage during any of the attempts Yes GoTo 4 No GoTo 5 caused by an internal problem Verify if the problem is only experienced under extreme hot or cold conditions Were there any problems found Yes Repair as necessary Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No Test Complete Check the Transmission Fluid level per the Service Information Is the Transmission Fluid level at the proper level Yes
59. the DTC reset after the engine was started Yes gt GoTo 2 No GoTo 5 Ignition on engine not running With the DRBIII select the following screens in order BODY MIC MONITOR DISPLAY PCI BUS ENGINE INFO Does the DRBIII9 read NO RESPONSE from any of the listed PCM monitors Yes Refer to Communication Category for the related symptom s Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Ignition on engine not running All With the DRBIII attempt communication with the MIC Can you communicate with the MIC Yes GoTo 3 No Refer tothe Communication category for the related symptom s Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 26 TRANSMISSION PO600 SERIAL COMMUNICATION LINK MALFUNCTION Continued APPLICABILITY The conditions necessary to set this DTC are not present at this time Using the schematics as guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 27 TRANSMISSION Symptom P0604 INTERNAL POSSIB
60. the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the Transmission Temperature Sensor Signal circuit in the TCM harness connector Is the voltage above 8 0 volts Yes Repair Transmission Temperature Sensor Signal circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 8 144 TRANSMISSION P1799 CALCULATED OIL TEMP IN USE Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TCM harness connector Disconnect the TRS harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the Transmission Temperature Sensor Signal circuit Is the resistance below 5 0 ohms Yes Repair Transmission Temperature Sensor Signal circuit shorted to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 11 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit
61. the temperature is above 93C 200 F the transmission must cool to below 93C 200 F First gear is engaged in overdrive after Quick Learn is completed Place the in park after performing Quick Learn The Quick Learn funcion should be performed Upon installation of a new service TCM After replacement or rebuild of internal trans mission components or the torque converter f one or more of the dutch volumes indexes CVI s contain skewed readings because of abnormal conditions To perform the Quick Learn procedure the fol lowing conditions must be met tisimperativethat the vehicle be shifted into OD with the engine running and the oil level set tothe correct level This step will purgethe air in the dutch circuits to prevent erroneous dutch volume values which could cause poor initial shift quality The brakes must be applied The engine must be idling The throttle angle TP sensor must be less than 3 degrees The shift lever position must stay in neutral until prompted to shift into OD Theshift lever must stay in OD after the Shift to Overdrive prompt until the DRBIII indi cates the procedure is complete The oil temperature must be between 15C 60 F and 93C 200 F V GENERAL INFORMATION NOTE The above conditions must be maintained during the procedure to keep the procedure from being aborted The Quick Learn procedure is performed with the DRBIII9 by selecting Tra
62. to appropriate symptom in the Transmission category If any of these DTC s are present they will cause a gear ratio error Go to test for P1791 first if it is present Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 3 51 TRANSMISSION PO731 GEAR RATIO ERROR IN 1ST Continued ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems All Check and adjust the fluid per the service information With the DRBIII9 perform the 1st gear clutch test Follow the instructions on the DRBIII Increase the throttle angle TPS Degree to 30 for no more than few seconds CAUTION Do not overheat the transmission Did the dutch test pass Input speed remains at 0 Yes 4 No GoTo 5 The conditions to set this DTC are not present at this time Check the gearshift linkage adjustment Gear ratio DTC s can be set by problems in the Input and Output Speed Sensor circuits If the vehicle passes the clutch test and still sets gear ratio DTC s check the Speed Sensors for proper operation NOTE Remove the Starter Relay from the PDC This will prevent the vehicle from being started in gear Check the Speed Sensor wiring and connectors for good connection then perform a wiggle test using the Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 This DTC can also be set under extreme temperature conditions this is usually caused by
63. to ground or open circuit in the Transmis sion Control Relay circuit s gt connector problem gt Name of code 725 18 Engine Speed Sensor Circuit When monitored Whenever the engine is run ning Set condition This code is set when the engine speed sensed by the Transmission Control Module TCM is less than 390 RPM or greater than 8000 RPM for more that 2 0 seconds Theory of operation The TCM uses either a EATX RPM signal simulated Crank Sensor signal or the TCM uses the Crank Postion Sensor signal to calculate engine RPM depending on the engine application The signal supplied by the PCM and uses a dedicated circuit is called the EATX RPM Signal circuit The Crank Position Sensor signal is a spliced circuit from the engine Crank Position Sensor If the TCM interprets this signal to be out of range when the engine is running as reported by the PCM over the bus the code is set Transmission Effects The MIL illuminates and the transmission system defaults to Relay Open limp in mode Possible causes gt Open or short in EATX RPM Signal circuit 3 5L gt Open or short in Crank Position Sensor Signal circuit 3 3L 3 8L gt Open or short in Crank Position Sensor ground circuit 3 3L 3 8L gt TCM and or PCM connector problems gt gt Name of code 716 19 Bus Communication with Engine Module When monitored Continuously with key on Set condition f no PC
64. transmission to overheat the AutoStick mode will be canceled and a code will be set Transmission Effects The 3 position shift sched ule that is used in non AutoStick applications is substituted while operating in the AutoStick gear selector position No limp in mode occurs Possible causes gt Engine overheat refer to service manual for diagnosis and repair gt Transmission Overheat Restricted transmission cooling system Transmission fluid overfilled Radiator fan not functioning properly Extended driving in low gear Note Strenuous driving conditions may cause the vehicle to overheat If the driver operates in or initiates AutoStick with an overheated vehicle the code will be set Name of code P 1798 73 Deteriorated Transaxle Fluid When monitored At every Fully Electronically Modulated Converter Clutch FEMCC to Partial Electronically Modulated Converter Clutch PEM CC transition miles when A C compressor clutch is being cycled Set condition The code will be set if vehicle shudder is detected 20 times when theA C clutch is cycled Theory of operation While in 3rd or 4th gear FEMCC and just before the A C clutch engages the Powertrain Control Module PCM requests the Transmission Control Module TCM to momen tarily establish PEMCC operation If vehicle shud der is detected during the FEMCC to PEMCC transition a counter is incremented If the count reaches 20 the trouble code is set The driver
65. upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 38 TRANSMISSION 715 1 SPEED SENSOR ERROR Continued ACTION APPLICABILITY Start the engine in park With the DRBIII observe the Input Speed Sensor RPM Is the Input Speed Sensor Reading below 400 RPM Yes gt GoTo 3 No GoTo 11 Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Ignition on engine not running Using the Transmission Simulator set the rotary knob to the 3000 1250 position Turn the Input Output switch to ON With the DRBIII observe the Input RPM and Output RPM Does the Input speed read 3000 RPM and the Output speed read 1250 RPM 47 50 RPM Yes gt GoTo 4 No GoTo 5 NOTE Disconnect the Transmission Simulator and reconnect all harness connectors If there are no possible causes remaining view repair All Repair Replace the Input Speed Sensor Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Input Speed Sensor harness connector Note Check connectors Clean repair as necessary Measure the resista
66. using the Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 This DTC can also be set under extreme temperature conditions this is usually 58 TRANSMISSION Symptom P0736 GEAR RATIO ERROR IN REVERSE When Monitored and Set Condition P0736 GEAR RATIO ERROR IN REVERSE When Monitored The Transmission Gear Ratio is monitored continuously while the Transmission is in Gear Set Condition If the ratio of the input RPM to the output RPM does not match the current Gear Ratio POSSIBLE CAUSES RELATED DTC S PRESENT INTERMITTENT GEAR RATIO ERRORS TRANSMISSION INTERNAL ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and re
67. 0 ohms Yes Repair the Torque Management Request Sense circuit for open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 Turn the ignition off to the lock position Disconnect the PCM harness connector Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measuretheresistance between ground and the Torque Management Request Sense circuit Is the resistance below 5 0 ohms Yes Repair Torque Management Request Sense circuit for a short to ground Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 Turn the ignition off to the lock position Disconnect the TCM harness connector Ignition on engine not running Measure the voltage of the Torque Management Request Sense circuit in the TCM harness connector Is the voltage above 10 5 volts Yes Repair Torque Management Request Sense circuit short to volt age Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 7 131 TRANSMISSION P1793 TRD LINK COMMUNICATION ERROR Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TCM harness connector Ignition on engine not running Measure the voltage of the Torque Management Request Sense circuit in the TCM harness connector Is the voltage above 7 0 volts Yes Replace the WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFI
68. 1 0 2 0 3 0 4 0 5 0 6 0 7 0 TABLE OF CONTENTS INTRODUCTION aad Qa cR Fri P sw 1 Td SYSTEM COVERAGE ER Urn AUR drei E pete 1 12 SIX STEP TROUBLESHOOTING PROCEDURE 24222 e REV Rn 1 IDENTIFICATION OF SYSTEM occ oven creado rh 1 SYSTEM DESCRIPTION AND FUNCTIONAL 1 2 1 GENERAL BESORIPTION ue dr RE RR Rh REOR ERR ERR ERE new 1 22 FUNCTIONAL OPERATION iossceEsuer EE ke 1 321 AUTOS TICK FEATURE iuis bee RE 1 3 2 2 TRANSMISSION OPERATION AND SHIFT SCHEDULING VARIOUS OIL TEMPERATURES eL ka ERE ERU rm RR 2 44 5525 bond ba bese be heed be be oe ES 3 3 3 1 HARD CODE 555855652 inp rA EESE A RUE EE APERTI 3 332 ONE TRIP FAILURES ig trn Pe IRURE 3 3 3 3 INTERMITTENT osos REL RR RR rar 3 d SIAMDISSINOGESELODUNTER 3 3 5 gt 55 5 5545 5 5556 RR 4 3 3 6 LIST OF DIAGNOSTIC TROUBLE 4 def DIGDBDESORIPTIONS Er ee RR 5 338 QUICK LEARN 2 0028 id bebe peed oe 16 339 CLUTCH VOLUMES perat rnr ERI E RE RE REA 17 3 3 10 ELECTRONIC
69. 18YL BR TRANSMISSION CONTROL RELAY CONTROL 87 T16 18YL OR TRANSMISSION CONTROL RELAY OUTPUT 87A 170 Hf 0000000000 40 30 0000000000 20 0000000000 10 LJ POWERTRAI CONTROL MODULE CI CONNECTOR PINOUTS POWERTRAIN CONTROL MODULE C1 GRAY BLACK 40 WAY CAV CIRCUIT FUNCTION 1 2 K18 16DB OR 3 3L 3 8L IGNITION COIL NO 3 DRIVER 3 K17 16DB TN IGNITION COIL NO 2 DRIVER 4 5 V32 18VT YL SPEED CONTROL ON OFF SWITCH SENSE 6 K342 16BR WT AUTOMATIC SHUTDOWN RELAY OUTPUT 7 K13 16BR LB FUEL INJECTOR NO 3 DRIVER 8 K20 18BR GY GENERATOR FIELD DRIVER 9 10 2130 18BK BR GROUND 11 K19 16DB DG IGNITION COIL NO 1 DRIVER 12 G6 16VT GY ENGINE OIL PRESSURE SWITCH SENSE 13 K11 16BR YL FUEL INJECTOR NO 1 DRIVER 14 K58 16BR VT 3 3L 3 8L FUEL INJECTOR NO 6 DRIVER 15 K38 16BR OR 3 3L 3 8L FUEL INJECTOR NO 5 DRIVER 16 K14 16BR TN FUEL INJECTOR NO 4 DRIVER 17 K12 16BR DB FUEL INJECTOR NO 2 DRIVER 18 K99 18BR LG OXYGEN SENSOR 1 1 HEATER CONTROL 19 20 F202 18PK GY FUSED IGNITION SWITCH OUTPUT RUN START 21 22 23 24 25 K42 18DB YL KNOCK SENSOR SIGNAL 26 K2 18VT OR ENGINE COOLANT TEMPERATURE SENSOR SIGNAL 27 K902 18BR DG OXYGEN SENSOR GROUND 28 29 30 K41 18DB LB OXYGEN SEN
70. 51 18YL 3 3L 3 8L FUSED IGNITION SWITCH OUTPUT START 4 2 18DG WT TRS REVERSE SENSE 5 716 18YL OR 3 3L 3 8L TRANSMISSION SAFETY SHUTDOWN RELAY OUTPUT 6 715 18YL BR 3 3L 3 8L TRANSMISSION CONTROL RELAY CONTROL 7 18DB YL A C COMPRESSOR CLUTCH RELAY OUTPUT 8 K31 1888 FUEL PUMP RELAY CONTROL 9 C13 18LB OR AIC COMPRESSOR CLUTCH RELAY CONTROL 10 104 18YL RD 3 3L 3 8L FUSE 11 12 13 1025 18WT VT 3 3L 3 8L PCI BUS EATX 14 T752 18DG OR ENGINE STARTER MOTOR RELAY CONTROL 15 7116 18BK VT GROUND 16 51 18BR WT AUTOMATIC SHUTDOWN RELAY CONTROL 17 F202 18PK GY IGNITION SWITCH OUTPUT RUN START 18 K173 18BR VT RADIATOR FAN RELAY CONTROL 19 F202 18PK GY IGNITION SWITCH OUTPUT RUN START 20 109 180R RD FUSED B 165 N N o R E 2 CONNECTOR PINOUTS GRAY 5 LOU 1 10 7473 CUN 6 O INTELLIG ENT POWER MODULE C4 BLACK 1 Ole 4 5 L INTELLIG EN E POWER C MODULE C5 0 R P WHITE N 14 0 5 H 1 U 10 3r 6 5 Es T NTELLIG ENT POWER ODULE C6 INTEL
71. ANSMISSION P1714 LOW BATTERY VOLTAGE Continued ACTION APPLICABILITY With the DRBIII read the PCM DTC s Are any Charging System related DTC s stored in the PCM Yes Refer to the Charging System category and repair any PCM Charging System DTC s before testing DTC P1714 Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 With the DRBIII9 read Transmission DTC s With the DRBIII Check the STARTS SINCE SET counter Note This counter only applies to the last DTC set Is the Starts Since Set counter for P1714 set at 0 Yes gt GoTo 4 No GoTo 10 Turn the ignition off to the lock position Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Ignition on engine not running Using a 12 volt test light connected to ground check the Fused Ignition Switch Output circuit in the TCM harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes gt GoTo 5 No Repair the Fused Ignition Switch Output Run Start circuit for an open or high resistance Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Remove the Starter Relay from the IPM Turn the ignition switch to the start position Using a 12 volt test light connected to ground check the Fused Ignition Sw
72. ARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Ignition on engine not running Measure the voltage of the Transmission Control Relay Output circuit in the Transmission Solenoid Pressure Switch Assembly harness connector 15 the voltage above 0 5 volt Yes Repair the Transmission Control Relay Output circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 90 TRANSMISSION P1767 TRANSMISSION RELAY ALWAYS ON Continued ACTION APPLICABILITY The conditions necessary to set this DTC are not present at this time All Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 91 TRANSMISSION Symptom P1768 RELAY OUTPUT ALWAYS OFF When Monitored and Set Condition P1768 RELAY OUTPUT ALWAYS OFF When Monitored Continuously Set Condition This code is set when less than 3 volts are present at the transmission control relay output circuits
73. ATIO ERRORS TRANSMISSION INTERNAL ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII9 read Transmission DTC s If any of these DTC s are present perform their respective tests first Are DTC s P1791 P0715 P0720 P1794 P1720 present also Yes Refer
74. After this is verified the voltage at the Solenoid Pack pressure switches is checked There should be no voltage on the pressure switches at this time The TCM will then activate the relay Transmission Effects The MIL illuminates and the transmission system defaults to Relay Open limp in mode Possible causes gt Short to battery on one or more pressure switch sense circuits gt connector problems gt Name of code 1781 21 OD Pressure Switch Sense Circuit When monitored Whenever the engine is run ning Set condition This code is set if the OD pressure switch is open or closed at the wrong time a given gear see chart below Theory of operation The Transmission system uses three pressure switches to monitor the fluid pressure in the L R 2 4 and OD dutch circuits The pressure switches are continuously monitored for the correct states in each gear as shown below Normal Pressure Switch States Ger LR 24 OD R OP OP OP N CL OP OP 1st CL OP OP 2nd OP CL OP 3rd OP OP CL 4th OP CL CL OP switch is open CL switch is closed Transmission Effects Normal operation will be experienced if no other codes are present TCM will ignore the code Limp in condition will only occur if code 1781 21 is present with a code 705 28 Possible causes gt If code P1791 35 is present ignore code P1781 21 and perform code P1791 diagnostic procedures gt OD pressure switch
75. BIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 53 TRANSMISSION 0732 RATIO ERROR IN 2ND Continued ACTION APPLICABILITY With the DRBIII9 read Transmission DTC s If any of these DTC s are present perform their respective tests first Are DTC s P1791 P0715 P0720 P1794 P1720 present also Yes Refer to appropriate symptom in the Transmission category If any of these DTC s are present they will cause a gear ratio error Go to test for P1791 first if it is present Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 NOTE Low fluid level can be the cause of many transmission problems Check and adjust the fluid level per the Service Information With the DRBIII9 per
76. CATION TEST VER 1 GoTo 8 If there are no possible causes remaining view repair Repair Replace the Powertrain Control Module Replace and program the PCM Module in accordance with the Service I nformation Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 132 TRANSMISSION Symptom P1794 SPEED SENSOR GROUND ERROR When Monitored and Set Condition P1794 SPEED SENSOR GROUND ERROR When Monitored The transmission gear ratio is monitored continuously while the transmission is in gear Set Condition After a TCM reset in neutral and Input Output equals a ratio of input to output of 2 50 POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS SPEED SENSOR GROUND CIRCUIT OPEN TCM SPEED SENSOR GROUND ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and rep
77. Check connectors Clean repair as necessary Connect a jumper wire between the Fused B circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit in the Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes GoTo 7 No Repair the Transmission Control Relay Output circuit for an open or high resistance Perform 41 TRANSMISSION VERIFICATION TEST VER 1 70 TRANSMISSION P0760 OD SOLENOID CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the OD Solenoid Control circuit from the TCM harness connector to the Transmission Solenoid Pressure Switch Assembly harness connec tor Is the resistance above 5 0 ohms Yes Repair the OD Solenoid Control circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 8 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission
78. Condition 0725 SPEED SENSOR CIRCUIT 3 3L 3 8L When Monitored Whenever the engine is running Set Condition Engine RPM less than 390 or greater than 8000 for more than 2 seconds while the engine is running POSSIBLE CAUSES PCM TPS DTC S PRESENT INTERMITTENT WIRING amp CONNECTORS CRANK POSITION SENSOR GROUND CIRCUIT OPEN CRANK POSITION SENSOR SIGNAL CIRCUIT OPEN TCM ENGINE SPEED SENSOR CIRCUIT APPLICABILITY NOTE Low fluid level be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTC s Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some proble
79. DTC will set POSSIBLE CAUSES POWER UP AT SPEED APPLICABILITY This DTC is set when the TCM is initialized while the vehicle is moving down the road in valid forward gear Check all of the Fused B Fused Ignition Switch Output and Ground circuits to the for an intermittent open or short to ground Were there any problems found Yes Repair wiring and or connectors as necessary Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 85 TRANSMISSION Symptom P1765 SWITCHED BATTERY When Monitored and Set Condition P1765 SWITCHED BATTERY When Monitored Ignition key is turned from the OFF position to RUN position and or ignition key is turned from the CRANK position to RUN position Set Condition This DTC is set if the Transmission Control Module senses voltage on any of the Pressure Switch Inputs prior tothe TCM energizingthe Transmission Control Relay POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS 2 4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE L R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE TCM SWITCHED BATTERY ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avo
80. EMS CHECK FOR INTERMITTENT WIRING amp CONNECTORS COLD TRANSMISSION ACTION APPLICABILITY Using the DRBIII9 check all other Modules for signs of a PCI bus problem such as bus related DTC s and or communication problems Check and diagnose all 1 trip failures as a hard code Although it takes two occurences of a missed TRD link message to set the DTC P1793 one missed message will cause the transmission to short shift until the next start up If the vehiclehas any indications of a bus problem the bus must be repaired first Do any of the other modules show signs of a bus problem Yes Repair the PCI bus problem Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 2 NOTE If the Transmission shifts too early when the Transmission is cold this is a normal condition The software is designed to protect the Trans mission from high torque and or high RPM shifts during cold operation Did the problem occur when the Transmission temperature was cold Yes This is a normal condition Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 3 The conditions necessary to set the DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors Wiggle the wires while checking for shorts and open circuits Although it takes two occurences of a missed TRD link message to set the DTC P1793 one missed message will cause the transmission to short shift until the next start
81. ENSOR 3 31 3 8 CONNECTOR PINOUTS TRANSMISSION RANGE SENSOR 3 3L 3 8L GRAY 10 WAY CAV CIRCUIT FUNCTION 1 T2 18DG WT TRS REVERSE SENSE 2 3 T13 18DG VT SPEED SENSOR GROUND 4 T54 18DG OR TRANSMISSION TEMPERATURE SENSOR SIGNAL 5 T41 18DG GY TRS T41 SENSE 6 Z252 18BK WT GROUND 7 T1 18DG LB TRS T1 SENSE 8 T3 18DG DB TRS T3 SENSE 9 T42 18DG YL TRS T42 SENSE 10 741 18YL DB PARK NEUTRAL POSITION SWITCH SENSE TRS 741 175 N N o R 4 2 7 NOTES 176 SCHEMATIC DIAGRAMS 10 0 SCHEMATIC DIAGRAMS TRANSMISSION SOLENOID PRESSURE SWITCH ASSEMBLY 4 7 8 Y Y Y5 6 T 094 a 1 mE RE ii a5 6 TRANSMISSION CONTROL RELAY 85 c3 1 FUSED 8 AUTOSTICK SWITCH MUX POWERTRAIN CONTROL MODULE THROTTLE POSITION SENSOR SIGNAL 35 5 VOLT SUPPLY 61 THROTTLE POSITION SENSOR SENSOR GROUND 43 VEHICLE SPEED SENSOR SIGNAL 66 PCI BUS SIGNAL 59 EATX RPM SIGNAL 71 TORQUE MANAGEMENT 63 REQUEST SENSE 20 19 60 59 50 47 16 17 15 56 55 41TE TRANSMISSION RS RG 3 5 ONLY TRANSMISSION CONTROL MODULE TCM SCI RECEIVE be SOLENOID CONTROL SGUTHANEMIT o
82. ERIFICATION TEST VER 1 GoTo 7 Has the TCM been replaced or disconnected Yes Replacing disconnecting the TCM will set this DTC Erase the DTC and return the vehicle to the customer Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 8 Turn ignition off to the lock position Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Using a 12 volt test light connected to 12 volts check all the ground circuits in the TCM harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the light illuminate brightly at all ground circuits Yes Test Complete No Repair the Ground circuit s as necessary Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 128 TRANSMISSION P1792 BATTERY WAS DISCONNECTED Continued ACTION APPLICABILITY The conditions necessary to set this DTC are not present at this time All Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 129 TRANSMISSION Symptom P1793 TRD LINK COMMUNICATION ERROR When Monitored and Set Condition P1793 TRD LINK COMMUNICATION ERROR When Monitored The transmission
83. ES 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 Some operations in this manual require that hydraulic tubes hoses and fittings disconnected for inspection or testing purposes These systems when fully charged contains fluid at high pressure Before disconnecting any hydraulic tubes hoses or fittings be sure that the system is fully depressur ized When servicing a vehide always wear eye pro tection and remove any metal jewelry such as watchbands or bracelets that might make an inad vertent electrical contact When diagnosing a transmission system problem it is important to follow approved procedures where applicable Following these procedures is very im portant to the safety of individuals performing diagnostic tests 4 2 2 VEHICLE PREPARATION FOR TESTING Make sure the vehicle being tested has a fully charged battery If it does not false diagnostic codes or error messages may occur It is extremely impor tant that accurate shift lever position data be avail able to the TCM The accuracy of any diagnostic trouble code found in memory is doubtful unless the Shift Lever Test performed on the DRB Scan Tool passes 4 2 3 SERVICING SUB ASSEMBLIES Some components of the powertrain system are intended to be serviced in assembly only Attempt ing to remove or repair certain system subcompo nen
84. Except at closed throttle at speeds above 113 133 Km h 70 83 MPH Overheat temperature above 115 240 F engine coolant temperature above 118C 244 F gt Goes toa Hot below 110C 230 F oil temperature or a Super Overheat above 115C 240 F oil temperature gt Delayed 2 3 upshift 40 51 Km h 25 32 MPH gt Delayed 3 4 upshift 66 77 Km h 41 48 MPH gt 3rd gear FEMCC from 48 77 Km h 30 48 MPH gt 3rd gear PEMCC from 43 50 Km h 27 31 MPH Super Overheat Oil temperature above 127C 260 F gt Goes back to a Overheat below 115C 240 F oil temperature gt a Overheat shift schedules features apply gt 2nd gear PEMCC above 35 Km h 22 MPH gt Above 35 Km h 22 MPH the torque converter will not unlock unless thethrottleis dosed i e at 80 Km h 50 MPH 4th FEMCC to 3rd FEMCC shift will be made during a part throttle kick down or a 4th FEMCC to 2nd PEMCC shift will be made at wide open throttle or if a wide open throttle 2nd PEMCC to 1 kickdown is made Causes for operation in the wrong tempera ture shift schedule Extreme Cold or Cold shift schedule at start up gt Temperature Sensor circuit Overheat or Super Overheat shift schedule after extended operation gt Operation in city traffic or stop and go traffic gt Engine idle speed too high gt Aggressive driving in low gear gt Trailer towingin OD gear position use 3 position or A S 3rd if frequent shift
85. GENERAL INFORMATION Name of code 1784 24 L R Pressure Switch Sense Circuit When monitored Whenever the engine is run ning Set condition This code is set if the L R pressure switch is either open or dosed at the wrong time in a given gear Theory of operation The Transmission system uses three pressure switches to monitor the fluid pressure in the L R 2 4 and OD elements The pressure switches are continuously monitored for the correct states in each gear as shown below Normal Pressure Switch States Gear L R 2 4 OD R 15 clt OP OP 2nd OP 3rd OP OP CL 4th OP CL CL OP switch is open CL switch is closed Transmission E ffects f a set condition is identi fied 1st gear and torque converter lock up EMCC will be inhibited The vehide will launch in 2nd gear and shift normally through the gears without allowing EMCC If during the same key start the set condition is no longer valid the transmission will return to normal operation 1st and EMCC available A relay open limp in will not occur unless code P 1784 24 is accompanied by a code 705 28 Possible causes gt If code P1791 35 is present ignore code 1784 24 and perform code P 1791 35 diagnos tic procedures gt L R pressure switch sense circuit open or shorted to ground between TCM and solenoid pack gt L R pressure switch sense circuit shorted to battery gt Solenoid pack gt Val
86. GHT FRONT DOOR UNLOCK DRIVER 27 20TN LB RIGHT SLIDING DOOR UNLOCK DRIVER 28 1 20TN LG LEFT FRONT DOOR UNLOCK DRIVER 29 30 31 32 W13 18BR LG REAR WIPER MOTOR CONTROL 33 M24 20YL WT COURTESY LAMPS DRIVER 34 163 o N N E R 4 2 95 CONNECTOR PINOUTS SN BRAKE LAMP SWITCH BLACK 6 WAY CIRCUIT FUNCTION pits 1 103 18GY RD FUSED B MENORES 2 150 18WT TN BRAKE LAMP SWITCH OUTPUT 6 JJ 1 3 20 SPEED CONTROL BRAKE SWITCH OUTPUT BRAKE 4 V32 20VTIYL SPEED CONTROL ON OFF SWITCH SENSE LAMP 5 7429 20BK OR GROUND SWITCH 6 B29 200G WT BRAKE SWITCH SENSE BLACK CRANKSHAFT POSITION SENSOR BLACK 3 WAY CIRCUIT FUNCTION 3 1 1 F888 18BR PK 8 VOLT SUPPLY 2 K900 18DB DG SENSOR GROUND P p FT 3 K24 18BR LB CRANKSHAFT POSITION SENSOR SIGNAL SENSOR 0 N DATA LINK CONNECTOR WHITE 16 WAY N CIRCUIT FUNCTION E 2 1025 20WT VT PCI BUS T 3 WHITE 4 211 18BK LG GROUND R 5 2111 188KWT GROUND 16 6 D20 20WT LG SCI RECEIVE P 7 D21 20WT BR SCI TRANSMIT 8 e 9 1023 20WT BR FLASH PROGRAM ENABLE 10
87. GoTo 3 24 TRANSMISSION 0120 POSITION SENSOR SIGNAL CIRCUIT continued ACTION APPLICABILITY Start the engine Allow the engine to idle All With the DRBIII9 Check the Throttle Position Sensor Voltage under Transmission Sensors Is the Throttle Position Sensor voltage below 0 3 or above 1 0 volts Yes GoTo 4 No GoTo 7 Turn the ignition off Disconnect the TPS harness connector Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Sensor Ground circuit between the TPS harness connector and the Transmission Control Module harness connector 15 the resistance below 5 0 ohms Yes gt GoTo 5 No Repair the Sensor Ground circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off Disconnect the Throttle Position Sensor harness connector Disconnect the Transmission Control Module harness connector Note Check connectors Clean repair as necessary Measure the resistance of the TPS Signal Circuit from the TCM harness connector to the TPS harness connector Is the resistance below 5 0 ohms Yes 6 No Repair the TPS signal circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Replace the WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41
88. I bus messages are received from the Powertrain Control Module PCM for 10 seconds Theory of operation The TCM communicates with the PCM usingthe PCI bus It relies on certain information to function properly The TCM contin uously monitors the PCI bus to check for messages broadcast from the PCM Transmission Effects Delayed 3 4 shifts No EMCC and early 3 4 shifts for a few minutes after engine is started Possible causes gt Open or shorted PCI bus circuit gt gt Name of code 1765 20 Switched Battery When monitored key is turned from off position to run position and or ignition key is turned from crank position to run position Set condition This code is set if the Transmission Control Module senses voltage on any of the pressure switch inputs prior tothe TCM energizing the relay Theory of operation The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode When the relay is off no power is supplied to the solenoid pack and the transmission is in a limp in mode The relay output is fed back to the TCM through pins 16 and 17 Itis referred to as the Trans Relay Output circuit or a switched battery Immediately after a controller reset ignition key turned tothe run position or after cranking engine the TCM verifies that the relay contacts are open by checking for no voltage at the switched battery terminals
89. ION 715 1 SPEED SENSOR ERROR Continued ACTION APPLICABILITY The conditions necessary to set this DTC are not present at this time All Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 41 TRANSMISSION Symptom 720 SPEED SENSOR ERROR When Monitored and Set Condition 0720 SPEED SENSOR ERROR When Monitored The transmission gear ratio is monitored continuously while the transmission is in gear Set Condition If there is an excessive change in output RPM in any gear POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN SPEED SENSOR GROUND CIRCUIT OPEN OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGE OUTPUT SPEED SENSOR ERROR TCM OUTPUT SPEED SENSOR ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIIIS read the engine
90. IRCUIT SHORT TO VOLTAGE INTERNAL TRANSMISSION TCM 2 2 HYDRAULIC PRESSURE 118 TRANSMISSION P1788 2 4 HYDRAULIC PRESSURE TEST FAILURE Continued ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine 5 Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII9 check for other Transmission DTCs Is the DTC P1791 present
91. If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the wiring diagram schematic as a guide inspect the wiring and connectors Test drive the vehicle through all Autostick gears Were any problems found or did the DTC return Yes Repair any wiring connector problems as necessary If the DTC set return to the symptom P1796 and perform the diagnostics Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Test Complete 138 TRANSMISSION Symptom P1797 MANUAL SHIFT OVERHEAT When Monitored and Set Condition P1797 MANUAL SHIFT OVERHEAT When Monitored Whenever engine is running and transmission is in the AutoStick mode Set Condition If the engine temperature exceeds 255 deg F or the transmission temperature exceeds 275 deg F while in AutoStick mode note Aggressive driving or driving in low for extended periods of time in AutoStick mode will set this code POSSIBLE CAUSES MANUAL SHIFT OVERHEAT APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid fa
92. Ignition on engine not running With the DRBIII9 perform the Shift Lever Position Test with the Transmission Simulator installed When the DRBIII 9 instructs you to put the Gear Selector in a particular position you must do so using the Simulator tool The LED for the gear position in question must be illuminated prior to hitting enter on the DRBIII Did the test pass Yes 5 GoTo 6 NOTE Disconnect the Transmission Simulator and reconnect all the har ness connectors If there are no possible causes remaining view repair Repair Replace the Transmission Range Sensor Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Pick the one that did not change state TRS T1 sense C4 GoTo 7 TRS T3 sense C3 GoTo 11 TRS 41 sense C1 GoTo 15 TRS T42 sense C2 GoTo 19 Turn the ignition off to the lock position Disconnect the TRS harness connector Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistance of the TRS T1 Sense circuit from the TCM harness connector to the TRS harness connector Is the resistance above 5 0 ohms Yes Repair the TRS Sense circuit for an open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 8 Ignition on engine not running With the DRBIII in Inputs Outputs read the TRS Sense circuits C1 thru Move the shift lever thru all gear positions pausing momentarily in
93. L OP OP OP OP OP OP T42 C2 CL CL CL CL CL CL OP OP OP OP CL Transmission Effects and possible causes Scenario 1 All PRNDL lights stay illuminated indefinitely in Park following a Key start gt Wrong Part Number for application gt TRS connector not plugged in gt C1 through C4 T1 T41 T42 circuits are either open shorted to ground or shorted to 12 volts gt PCI bus failure Open or shorted resulting in no communication to BCM or Cluster gt 5 gt gt Scenario 2 P is indicated following key start but all PRNDL lights illuminate in N following a shift from R to N If PRNDL lights illuminate in N and shifter is moved directly into 3 or L position without pausing in OD then the OD position shift schedule and electronic display will indicate OD until the shifter is shifted into the OD position and held for at least 3 seconds gt Worn Manual Lever Rooster Comb Check for heavy wearing by TRS switch contacts gt Intermittent C1 through C4 T1 T41 T42 circuits Check for corrosion terminal push outs or spread terminals at 60 way and or TRS switch 10 way connector gt 5 gt gt Scenario 3 If the invalid code happened while operating in the 3 or L position then the 3 or L shift schedule and electronic display will be frozen regardless of whether OD 3 or L is selected until the shifter
94. L RELAY OUTPUT CIRCUIT OPEN OD SOLENOID CONTROL CIRCUIT OPEN OD SOLENOID CONTROL CIRCUIT SHORT TO GROUND OD SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE OD SOLENOID TCM OD SOLENOID ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine DTC s prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 69 TRANSMISSION 760 SOLENOID CIRC
95. LE CAUSES TCM INTERNAL ERROR ACTION APPLICABILITY If there are no possible causes remaining view repair All Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 28 TRANSMISSION Symptom 605 POSSIBLE CAUSES TCM INTERNAL ERROR ACTION APPLICABILITY If there are no possible causes remaining view repair All Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 29 TRANSMISSION Symptom P0700 I NTERNAL POSSIBLE CAUSES TCM INTERNAL ERROR ACTION APPLICABILITY NOTE Make sure this DTC is set in the TCM before making repair All NOTE The PCM also sets a P0700 but it only indicates that a DTC is set in the TCM and turns the MIL on If there are no possible causes remaining view repair Repair Replace the WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 30 TRANSMISSION Symptom 705 SHIFTER SIGNAL When Monitored and Set Condition 705 SHIFTER SIGNAL When Monitored Continuously with the ignition key on Set Condition 3 occurrences in one key start of an invalid PRNDL code which lasts for more than 0 1 second POSSIBLE CAUSES CONDITION P0705 PRESEN
96. LIGENT POWER MODULE C4 GRAY 10 WAY CAV CIRCUIT FUNCTION 1 12127 12BK DG GROUND 2 1750 12YL GY ENGINE STARTER MOTOR RELAY OUTPUT 3 42 16BR WT AUTOMATIC SHUTDOWN RELAY OUTPUT 4 F500 18DG PK ANTILOCK FUSED IGNITION SWITCH RELAY OUTPUT RUN BRAKES 5 6 1025 16WT VT ANTILOCK PCI BUS BRAKES A107 12TN RD ANTILOCK FUSED BRAKES 8 111 12DG RD ANTILOCK FUSED BRAKES 9 A701 14BR RD FUSED B 10 INTELLIGENT POWER MODULE C5 BLACK 4 WAY CAV CIRCUIT FUNCTION 1 A1 0480 B 2 3 4 INTELLIGENT POWER MODULE C6 WHITE 10 WAY CAV CIRCUIT FUNCTION 14 A101 12VT RD FUSED B 4 2 7117 16 GROUND 7118 16BK YL GROUND 4 A110 1208 80 POWER FUSED SEAT 5 6 7 1208 FUSED FRONT BLOWER MOTOR RELAY OUTPUT 8 F307 16LB PK ACCESSO FUSED ACCESSORY RELAY OUTPUT RY RELAY POSITION 8 F307 16LB PK BATTERY FUSED POSITION 9 113 12WT RD POWER FUSED SLIDING DOOR 10 166 CONNECTOR PINOUTS INTELLIGENT POWER MODULE C7 BLACK 20 WAY
97. M QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Test Complete The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 82 TRANSMISSION Symptom P1738 HIGH TEMPERATURE OPERATION ACTIVATED When Monitored and Set Condition P1738 HIGH TEMPERATURE OPERATION ACTIVATED When Monitored Whenever the engine is running Set Condition Immediately when the Overheat shift schedule is activated 240 degrees Trans oil temp POSSIBLE CAUSES ENGINE COOLING SYSTEM MALFUNCTION INCORRECT FLUID LEVEL TRANSMISSION OIL COOLER PLUGGED HIGH TEMPERATURE OPERATIONS ACTIVATED ACTION APPLICABILITY Perform Engine Cooling System diagnostics per Service Information Is the engine cooling system functioning properly Yes 2 No Repair cause of engine overheating Refer to Service I nformation for additional repair information Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Check the Transmission Fluid level per the Service Information Is the Transmission Fluid Level at the proper level Yes 3 No Repair any Transmission Fluid leak as nece
98. NT POWER MODULE 159 84 PRESSURE PORT LOCATIONS 160 8 5 THROTTLE POSITION SENSOR 2 41 160 85 AUTOSTIOUOD sre rop awed eased 160 8 7 TRANSMISSION COMPONENT LOCATIONS 161 CONNECTOR PINOUTS TEM 163 AUTOSTICK SWITCH BLACK 2 163 BODY CONTROL MODULE C2 BLACK GREEN 34 163 BRAKE LAMP SWITCH BLACK 6 164 CRANKSHAFT POSITION SENSOR BLACK 3 164 DATA LINK CONNECTOR WHITE 16 WAY 164 DIAGNOSTIC JUNCTION PORT BLACK 16 165 INPUT SPEED SENSOR 3 3L 3 8L GRAY 2 165 INTELLIGENT POWER MODULE NATURAL 20 165 INTELLIGENT POWER MODULE C4 GRAY 10 166 INTELLIGENT POWER MODULE C5 BLACK 4 166 INTELLIGENT POWER MODULE C6 WHITE 10 WAY 166 INTELLIGENT POWER MODULE C7 BLACK 20 167 INTELLIGENT POWER MODULE C9 BLACK 10 167 LEFT REAR LAMP ASSEMBLY BLACK 6 167 OUTPUT SPEED SENSOR 3 31 3
99. OD Off Switch ground circuit if open in the ground wireis not found replace theAutostick OD Off Switch assembly Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Autostick OD switch harness connector NOTE Check connectors Clean repair as necessary Measure the resistance of the Autostick OD Off Mux I nput circuit to Ground Is the resistance below 5 0 ohms Yes Repair the Autostick OD Off Mux Input circuit for a short to ground Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 9 Turn the ignition off to the lock position Disconnect the harness connector Disconnect the Autostick OD switch harness connector NOTE Check connectors Clean repair as necessary Measure the resistance of the ground circuit between the Autostick OD switch 137 TRANSMISSION P1796 AUTOSTICK SENSOR CIRCUIT Continued APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Autostick OD switch harness connector NOTE Check connectors Clean repair as necessary Turn the ignition on Measure the voltage of the Autostick OD Off Mux Input circuit 15 the voltage above 5 5 volts Yes Repair the Autostick OD Mux Input circuit for a short to voltage Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 10
100. OES NOT POWER UP BLANK SCREEN If the LED s do not light or no sound is emitted at start up check for loose cable connections or a bad cable Check the vehicle battery voltage A mini mum of 11 volts is required to adequately power the DRBIII If all connections are proper between the DRBIII9 and the vehicle or other devices and the vehicle battery is fully charged an inoperative DRBIII may be the result of faulty cable or vehicle wiring For a blank screen refer to the appropriate Body Diagnostic 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 3 6 TRANSMISSION SIMULATOR MILLER TOOL 8333 AND FWD ADAPTER MILLER TOOL 8333 1 The transmission simulator simply put is an electronic device that simulates the electronic func tions of any EATX controlled transmission 41TE 42LE 45RFE and 545RF E It s basic function is to DRB III DISPLAY REPLACEABLE LENS ENTER KEYS LEDs CONTRAST gt with YES key QOS with YES key KEYPAD SHIFT KEY LED 80b57566 BACK LIGHTING aid the technidan in determining if an internal transmission problem exists or if the problem re sides in the vehide wiring or Transmission Control Module It is only useful for electrical prob lems It will not aid in the diagnosis of a failed mechanical component but it can tell you that the
101. P LAMP OPERATION Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the Left Reverse Lamp harness connector per the service information NOTE Check connectors Clean repair as necessary Measure the resistance between ground and the Reverse Lamp Ground circuit Is the resistance below 5 0 ohms Yes gt GoTo 6 No Repair the Reverse Lamp Ground circuit for an open Turn the ignition off to the lock position Disconnect the Left Reverse Lamp harness connector per the service information NOTE Check connectors Clean repair as necessary Measure the resistance across the Reverse Lamp contacts Is the resistance above 5 0 ohms Yes Replace the Reverse Lamp No GoTo 7 Turn the ignition off to the lock position Disconnect the Right Reverse Lamp harness connector per the service information NOTE Check connectors Clean repair as necessary Measure the resistance between ground and the Reverse Lamp Ground circuit Is the resistance below 5 0 ohms Yes gt GoTo 8 No Repair the Reverse Lamp Ground circuit for an open Turn the ignition off to the lock position Disconnect the Right Reverse Lamp harness connector per the service information NOTE Check connectors Clean repair as necessary Measure the resistance across the Reverse Lamp contacts Is the resistance above 5 0 ohms Yes Replace the Reverse Lamp GoTo 9 Turn the ignition off to the lo
102. PEN L R SOLENOID CONTROL CIRCUIT OPEN L R SOLENOID CONTROL CIRCUIT SHORT TO GROUND L R SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE L R SOLENOID INOPERATIVE TCM L R SOLENOID ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 63 TRANSMISSION P0750 LR SOLENOID CIRCUIT
103. PINION FACTOR OR RR 17 34 USING THE irse RES eR ens 18 35 ERROR MESSAGES Lover C ERE rre E OP ORE 18 351 DRBIIIe DOES NOT POWER UP BLANK SCREEN 18 3 5 2 DISPLAY IS NOT VISIBLE once tered Emrit REPRE ens 18 3 6 TRANSMISSION SIMULATOR MILLER TOOL 8333 AND FWD ADAPTER MILLER TOOL 8333 1 18 DISCLAIMERS SAFETY AND WARNINGS 18 DISCLAIMERS 5559 9142 fins 54404 an OR CREE 18 4 2 1 TECHNICIAN SAFETY INFORMATION 19 42 2 VEHICLE PREPARATION FOR TESTING 02020009 RR 19 423 SERVICING SUB ASSEMBLIES 19 424 DRBIII SAFETY INSTRUCTIONS 55525 84s wae 19 43 WARNINGS EREE REG E RR EH A Rc she EROR 20 4 3 1 VEHICLE DAMAGE 20 4 3 2 ROAD TEST COMPLAINT 20 4 3 8 ELECTRONIC PINION FACTOR 5 20 4 3 4 BULLETINS AND 15 20 REQUIRED TOOLS AND EQUIPMENT 20 GLOSSARY OF TERMS EXT RERPARRAG EE 21 61 ACRONYMS HG ER QURE Kaki AI a E E da qs 21 62 4 2 cesse ibd euo
104. QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Connect a jumper wire between the Fused B circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Note Check connectors Clean repair as necessary No Test Complete 74 TRANSMISSION Symptom P1714 LOW BATTERY VOLTAGE When Monitored and Set Condition P1714 LOW BATTERY VOLTAGE When Monitored With the engine running and the TCM has closed the Transmission Control Relay Set Condition If battery voltage at TCM Transmission Control Relay Output Sense circuit is less than 10 0 volts for 15 seconds P 1714 generally indicates a gradually falling battery voltage or resistive connections to the TCM POSSIBLE CAUSES RELATED CHARGING SYSTEM DTCS INTERMITTENT WIRING AND CONNECTO
105. RS FUSED IGNITION SWITCH OUTPUT RUN START CIRCUIT OPEN FUSED IGNITION SWITCH OUTPUT START CIRCUIT OPEN GROUND CIRCUIT OPEN FUSED B CIRCUIT TRANS CONTROL RELAY OUTPUT TO TCM HIGH RESISTANCE TCM LOW BATTERY VOLTAGE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTC s Check and repair all engine DTC s prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 75 TR
106. SOR 1 1 SIGNAL 31 T752 18DG OR DOUBLE START OVERRIDE 32 K24 18BR LB CRANKSHAFT POSITION SENSOR SIGNAL 33 K44 18DB GY CAMSHAFT POSITION SENSOR SIGNAL 34 35 K22 18BR OR THROTTLE POSITION SENSOR SIGNAL 36 K1 18VT BR MANIFOLD ABSOLUTE PRESSURE SENSOR SIGNAL 37 K21 18DB LG INTAKE AIR TEMPERATURE SIGNAL 38 39 40 K35 18DB VT EGR SOLENOID CONTROL 171 N N o R 4 2 7 CONNECTOR PINOUTS GRAY GRAY 50 4 frr o d rn E POWERTRAIN E CONTROL MODULE C2 R P N U 5 3 1 RIGHT REAR LAMP ASSEMBLY POWERTRAIN CONTROL MODULE C2 GRAY GRAY 40 WAY CAV CIRCUIT FUNCTION 41 v37 18VT SPEED CONTROL SWITCH SIGNAL 42 C18 18LB BR PRESSURE SIGNAL 43 K900 18DB DG SENSOR GROUND 44 F888 18BR PK 8 VOLT SUPPLY 45 46 A109 180R RD FUSED 47 48 K40 18BR LG 2 4L IDLE AIR CONTROL NO 3 DRIVER 49 K39 18VT DG 3 3L 3 8L IDLE AIR CONTROL NO 1 DRIVER 49 18VT LG 2 4L IDLE AIR CONTROL NO 2 DRIVER 50 2131 18BK DG GROUND 51 K141 18DB YL OXYGEN SENSOR 1 2 SIGNAL 52 53 54 55 56 36 18VT YL SPEED CONTROL VACUUM SOLENOID CONTROL
107. SWITCH SENSE CIRCUIT Continued APPLICABILITY With the DRBIII read Transmission DTC s Are there any Transmission Control Relay related DTC s P1765 1767 or 1768 present Yes Refer to symptom list and perform the appropriate test for Transmission Control Relay related DTC s Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter 2 or less for P1782 Yes gt GoTo 4 No GoTo 11 Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Note Check connectors Clean repair as necessary Ignition on engine not running On the Transmission Simulator select 2 4 on the Pressure Switch selector switch With the DRBIII9 monitor the 2 4 Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator Did the Pressure Switch state change from OPEN to CLOSED when the test button was pressed Yes gt GoTo 5 No GoTo 6 If there are no possible causes remaining view repair Repair Replace Transmission Solenoid Pressure Switch Assembly per the Service Information Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition o
108. T INTERMITTENT WIRING AND CONNECTORS TRS T1 SENSE CIRCUIT OPEN TRS T3 SENSE CIRCUIT OPEN TRS T41 SENSE CIRCUIT OPEN TRS T42 SENSE CIRCUIT OPEN TRS T1 SENSE CIRCUIT SHORTED TO GROUND TRS T3 SENSE CIRCUIT SHORTED TO GROUND TRS T41 SENSE CIRCUIT SHORTED TO GROUND TRS T42 SENSE CIRCUIT SHORTED TO GROUND TRS T1 SENSE CIRCUIT SHORTED TO VOLTAGE TRS T3 SENSE CIRCUIT SHORTED TO VOLTAGE TRS T41 SENSE CIRCUIT SHORTED TO VOLTAGE TRS T42 SENSE CIRCUIT SHORTED TO VOLTAGE TRANSMISSION RANGE SENSOR TCM TRS T1 SENSE CIRCUIT TCM TRS T3 SENSE CIRCUIT TCM TRS T41 SENSE CIRCUIT TCM TRS T42 SENSE CIRCUIT 31 TRANSMISSION 705 SHIFTER SIGNAL Continued ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine 5 Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shif
109. TCM and wiring are working properly and that the problem is internal Theignition switch should be in the lock position before attempting to install the simulator Follow all instructions included with the simulator If the feedback from the simulator is in doubt you can verify it s operation by installing it on a known good vehicle A known good vehicle would be defined as a vehidethat does not set any DTC s and drives and shifts as expected One important point to remember is that the Simulator receives it s power from the Trans Relay Output circuit If the transmission system is in Limp in Relay open the simulator will not oper ate This is not really an indication of a problem but an additional symptom If the simulator does not power up P led lit this is an indication that the problem is still present with the simulator hooked up This indicates that the problem is in the wiring or TCM and not the transmission Miller Tool 8333 1 consists of the adapter cables and overlay necessary to adapt the simulator to 41TE and 42LE transmissions 4 0 DISCLAIMERS SAFETY AND WARNINGS 4 1 DISCLAIMERS All information illustrations and specifications contained in this manual are based on the latest information at the time of publication The right is reserved to make changes at any time without notice 4 2 1 TECHNICIAN SAFETY INFORMATION WARNING ENGINES PRODUCE CARBON MONOXIDE THAT IS ODORLESS CAUSES SLOWER REACTION TIM
110. TION 1 T47 18YL DG 2 4 PRESSURE SWITCH SENSE 2 T50 18YL TN LOW REVERSE PRESSURE SWITCH SENSE 3 T9 18DG TN OVERDRIVE PRESSURE SWITCH SENSE 4 T16 18YL OR TRANSMISSION SAFETY SHUTDOWN RELAY OUTPUT 5 T59 18YL LB UNDERDRIVE SOLENOID CONTROL 6 T60 18YL GY OVERDRIVE SOLENOID CONTROL 7 T20 18DG WT LOW REVERSE SOLENOID CONTROL SOLENO D 8 T19 18YL DB 2 4 SOLENOID CONTROL PRESSURE SWITCH ASSEMBLY 3 3 3 8L THROTTLE POSITION SENSOR GRAY 3 WAY 1 CIRCUIT FUNCTION N 1 K900 18DB DG SENSOR GROUND N 2 K22 18BR OR THROTTLE POSITION SENSOR SIGNAL 3 F855 18PK YL 5 VOLT SUPPLY SENSOR T R 1 BLACK N 5 a TORQUE CONVERTER CLUTCH SOLENOID 2 4L BLACK 3 WAY U CAV CIRCUIT FUNCTION S TORQUE 2 F202 18PK GY FUSED IGNITION SWITCH OUTPUT RUN START CONVERTER K54 180 TORQUE CONVERTER CLUTCH SOLENOID CONTROL CLUTCH SOLENOID 2 41 173 o N N o R 4 2 7 CONNECTOR PINOUTS BLACK 20 60 EO m 41 TRANSMISS CONTRO MODULE 3 3 3 8L ON TRANSMISSION CONTROL MODULE 3 3L 3 8L BLACK 60 WAY CAV CIRCUIT FUNCTION 1 18DG LB TRS T1 SENSE 2 3 18DG
111. TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits Pay particular attention to the the point where the TPS signal and sensor ground circuits splice off from the engine circuits Were any problems found Yes Repair wiring and or connector as necessary Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 8 Turn the ignition on With the DRBIII9 read TPS VOLTS While monitoring the DRBIIIS slowly open and close the Throttle Is the voltage change smooth Yes Test Complete No Replace the Throttle Position Sensor Perform 41 TRANSMISSION VERIFICATION TEST VER 1 25 TRANSMISSION Symptom 00 RIAL COMMUNICATION LINK MALFUNCTION When Monitored and Set Condition PO600 SERIAL COMMUNICATION LINK MALFUNCTION When Monitored Continuously with engine running Set Condition The DTC sets in approximately 20 seconds if no BUS messages are received by the TCM POSSIBLE CAUSES NO COMMUNICATION WITH MIC NO COMMUNICATION WITH PCM INTERMITTENT WIRING AND CONNECTORS TCM INTERNAL ERROR APPLICABILITY With the DRBIII9 erase TCM DTC s Note Erase P0700 DTC in the PCM to turn the MIL light off after making transmission repairs Start the engine in park Did
112. UIT Continued ACTION APPLICABILITY With the DRBIII read Transmission Control Module DTC s All Are there any Transmission Control Relay related DTC s P1765 P1767 or P1768 present Yes Refer to symptom list and perform the appropriate symptom for the Transmission Control Relay related DTC s Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter for P0760 set at 0 Yes gt GoTo 4 No GoTo 11 Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Ignition on engine not running Monitor the OD Solenoid LED the Transmission Simulator Miller tool 8333 With the DRBIII actuate the OD Solenoid Did the OD Solenoid LED on the Transmission Simulator blink on and off during actuation Yes gt GoTo 5 No GoTo 6 If there are no possible causes remaining view repair Repair Replace the Transmission Solenoid Pressure Switch Assembly Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note
113. YING 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 theform at the back of the book and mail it back to us 1 1 SYSTEM COVERAGE This diagnostic procedures manual covers all 2001 equipped with a 41 transaxle 1 2 SIX STEP TROUBLESHOOTING PROCEDURE Diagnosis of the 41TE AE electronic transaxle is done in six basic steps verification of complaint verification of any related symptoms symptom analysis problem isolation repair of isolated problem verification of proper operation 2 0 IDENTIFICATION OF SYSTEM RG series vehicles equipped with a 4 speed trans mission GENERAL INFORMATION 3 0 SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION 3 1 GENERAL DESCRIPTION The 41TE AE electronic transaxle is a conven tional transaxle in that it uses hydraulically ap plied clutches to shift a planetary gear train How ever the electronic control system replaces many of the mechanical and hydraulic components used in conventional transmission valve bodies 3 2 FUNCTIONAL OPERATION The 41TE AE electronic transaxle has a fully adaptive control system The system performs it s functions based on continuous real time sensor feedback informati
114. adjust if necessary Refer to the Service information for the Fluid Fill procedure 7 NOTE If the Transmission Control Module or Torque Converter has been replaced or if the Transmission has been repaired or replaced it is necessary to perform the DRBIII9 Quick Learn Procedure and reset the Pinion Factor 8 NOTE If the Torque Converter is replaced or if a TCM is replaced on a vehicle whose Torque Converter has less than 3750 miles and less than 360 minutes of PEMCC then with the restart the TCC Break In This is in order to avoid possible shudder 9 Road test the vehicle With the DRBIII9 monitor the engine RPM Make 15 to 20 1 2 2 3 3 4 upshifts Perform these shifts from a standing start to 45 MPH with a constant throttle opening of 20 to 25 degrees 10 Below 25 MPH make 5 to 8 wide open throttle kickdowns to 1st gear Allow at least 5 seconds each in 2nd and 3rd gear between each kickdown 11 For a spedfic DTC drive the vehide to the Symptom s When Monitored When Set conditions to verify the DTC repair 12 NOTE Usethe EATX OBDII Task Manager to run Good Trip time in each gear this will confirm the repair and to ensure that the DTC has not re matured 13 Check for Diagnostic Trouble Codes DTC s during the road test If a DTC sets during the road test return to the Symptom list and perform the appropriate Symptom Were there any Diagnostic Trouble Codes DTCs set during the road test Yes Refer to the Sympto
115. air all engine prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Start the engine in park With the DRBIII observe the Input and Output Speed Sensor readings Is the Output Speed Sensor reading twice the Input Speed Sensor reading Yes gt GoTo 4 GoTo 3 133 TRANSMISSION P1794 SPEED SENSOR GROUND ERROR Continued ACTION APPLICABILITY The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary
116. an internal problem Verify if the problem is only experienced under extreme hot or cold conditions Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete If there are no possible causes remaining view repair Repair Repair internal transmission problem Check all components related to the Underdrive and L R dutches and inspect the Oil Pump Perform 41 TRANSMISSION VERIFICATION TEST VER 1 52 TRANSMISSION Symptom P0O732 GEAR RATIO ERROR IN 2ND lt When Monitored and Set Condition 0732 RATIO ERROR IN 2ND When Monitored The Transmission Gear Ratio is monitored continuously while the Transmission is in Gear Set Condition If the ratio of the input RPM to the output RPM does not match the current Gear Ratio POSSIBLE CAUSES RELATED DTC S PRESENT RELATED PRESSURE SWITCH DTC S PRESENT INTERMITTENT GEAR RATIO ERRORS TRANSMISSION INTERNAL ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTC s Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DR
117. and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 78 TRANSMISSION Symptom 1716 05 COMMUNICATION WITH PCM When Monitored and Set Condition 1716 05 COMMUNICATION WITH PCM When Monitored Continuously with ignition key on Set Condition If no bus messages are received from the Powertrain Control Module for 10 seconds POSSIBLE CAUSES NO COMMUNICATION WITH PCM OTHER BUS PROBLEMS PRESENT INTERMITTENT WIRING AND CONNECTORS TCM BUS COMMUNICATION ACTION APPLICABILITY With the DRBIII9 Check the STARTS SINCE SET counter Note This counter only applies to the last DTC set Is the STARTS SINCE SET counter equal to zero Yes GoTo 2 No GoTo 5 Ignition on engine not running With the DRBIII attempt to communicate with the Powertrain Control Module PCM Can the DRBIII communicate with the PCM Yes gt GoTo 3 No Refer to symptom list for problems related to No Response rom PCM Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 With the DRBIII check all of the other modules on the vehicle for evidence of a vehide bus problem Bus related DTC s in other modules point to an overall vehide bus problem Other symptoms such as a customer complaint of intermittent operation of bus controlled features also indicate a bus problem Does the PRNDL display in
118. arness connector Note Check connectors Clean repair as necessary Measure the resistance of the EATX RPM signal circuit between the TCM harness connector and the PCM harness connector Is the resistance above 5 0 ohms Yes Repair the EATX RPM Signal circuit for an open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 4 Turn the ignition off to the lock position Disconnect the PCM harness connector s Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the EATX RPM Signal circuit Is the resistance below 5 0 ohms Yes Repair the EATX RPM Signal circuit for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No gt GoTo 5 Turn the ignition off to the lock position Disconnect the PCM harness connector Note Check connectors Clean repair as necessary Ignition on engine not running Measure the voltage of the EATX RPM Signal circuit in the PCM harness connector Is the voltage above 10 0 volts Yes Repair the EATX RPM Signal circuit for a short to voltage Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 Turn the ignition off to the lock position Disconnect the Powertrain Control Module PCM harness connector Note Check connectors Clean repair as necessary Ignition on engine not running Measure the voltage between the EATX RPM Signal circuit and ground at t
119. at the switches are operational The TCM verifies that the switch doses when the cor GENERAL INFORMATION responding element is applied If a switch fails to dose it is retested If it fails the second test the code is set Transmission Effects The MIL illuminates and the transmission system defaults to Relay Open limp in mode Possible causes gt Pressure switch sense circuit shorted to battery between TCM and solenoid pack gt Low line pressure gt Solenoid Pack Name of code P 1791 35 Loss Of Prime When monitored If the transmission is slipping in any forward gear and the pressure switches are not indicating pressure a loss of prime test is run Set condition the transmission begins to slip in any forward gear and the pressure switch or switches that should be closed for a given gear are open a loss of prime test begins All available elements in 1st gear L R 2 4 and OD in 2nd 3rd and 4th gear 2 4 and OD are turned on by the Transmission Control Module TCM to see if pump prime exists The code is set if none of the pressure switches respond The TCM will continue to run the loss of prime test until pump pressure returns Theory of operation The loss of prime test is used to prevent transmission defaults which can be caused by a lack of pump prime Transmission Effects Vehicle will not move or transmission slips Normal operation will continue if pump prime returns Possible causes
120. ation Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Ignition on engine not running On the Transmission Simulator select L R on the Pressure Switch selector switch With the DRBIII9 monitor the L R Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator Did the Pressure Switch state change from OPEN to CLOSED when the test button was pressed Yes gt GoTo 5 GoTo 7 97 TRANSMISSION P1775 SOLENOID SWITCH VALVE LATCHED IN TCC POSITION Continued APPLICABILITY Turn the ignition off to the lock position Disconnect the harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between used B circuit and the Transmission Control Relay Output circuit in the IPM Ignition on engine not running Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit in the Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness t
121. ble Code DTC that is set whenever the system or component is monitored is a HARD code This means that the problem is there every time the TCM checks that system or compo nent Some codes will set immediately at start up and others will require a road test under specific conditions It must be determined if a code is repeatable Hard or intermittent before attempt ing diagnosis 3 3 2 ONE TRIP FAILURES A One Trip Failure when read from the TCM is a hard OBDII EURO STAGE III OBD code that has not matured for the full 5 minutes This applies to codes that will only set after 5 minutes of substituted gear operation 3 3 3 INTERMITTENT CODE A diagnostic trouble code that is not there every time the TCM checks the circuit or function is an a intermittent code Some intermittent codes such as codes P 1792 12 1767 14 P1768 15 P0725 18 P1716 19 1781 21 1782 22 1724 24 705 28 0120 29 0750 41 0755 42 760 43 0765 44 P1793 48 0715 56 0720 57 P1794 58 P1796 70 1799 74 P1739 76 P1717 77 and P0600 78 are caused by wiring or connector problems However intermit tent codes 50 54 are usually caused by intermit tent hydraulic seal leakage in the dutch and or accumulator circuits Problems that come and go like this are the most difficult to diagnose they must be looked for under the specific conditions that cause them 3 3 4 STARTS SINCE SET COUNTER For the mos
122. ble TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 NOTE The vehicle must be driven to set this DTC the transmission must be warm or hot with the Engine RPM above 1000 RPM This DTC is an indicator of 2 4 and or O D Hydraulic Pressure Switch DTC s present Perform the tests for P1787 and or P1788 determine which switch is failing If there are no possible causes remaining view repair Repair Refer to symptom list for problems related to Transmission and perform tests for P1787 and or P1788 Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 122 TRANSMISSION Symptom P1790 FAULT IMMEDIATELY AFTER SHIFT E When Monitored and Set Condition P1790 FAULT IMMEDIATELY AFTER SHIFT When Monitored After a speed ratio error is stored Set Condition This code is set if the associated speed ratio code is stored within 1 3 seconds after a shift POSSIBLE CAUSES CONDITION P1790 PRESENT APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTC s Check and repair all engine DTC s prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s a
123. cessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM No Test Complete 71 TRANSMISSION Symptom P0765 UD SOLENOID CIRCUIT When Monitored and Set Condition P0765 UD SOLENOID CIRCUIT When Monitored Initially at power up then every 10 seconds thereafter They will also be tested immediately after a Gear Ratio or Pressure Switch error is detected Set Condition Three consecutive Solenoid continuity test failures or one failure if test is run in response to a Gear Ratio or Pressure Switch error POSSIBLE CAUSES RELATED RELAY DTC S PRESENT INTERMITTENT WIRING AND CONNECTORS TRANSMISSION RELAY OUTPUT CIRCUIT OPEN UD SOLENOID CONTROL CIRCUIT OPEN UD SOLENOID CONTROL CIRCUIT SHORT TO GROUND UD SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE UD SOLENOID TCM UD SOLENOID APPLICABILITY NOTE Low fluid level be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine DTC s prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Fa
124. ck position Disconnect the TRS harness connector NOTE Check connectors Clean repair as necessary Measure the resistance between ground and the TRS Ground circuit Is the resistance below 5 0 ohms Yes 10 No Repair the TRS Ground circuit for an open Turn the ignition off to the lock position Disconnect the IPM harness connector Disconnect the TRS harness connector NOTE Check connectors Clean repair as necessary Measure the resistance of the TRS Reverse Sense circuit between the connector and the TRS connector 15 the resistance below 5 0 ohms Yes Test Complete No Repair the TRS Reverse Sense circuit an open 152 TRANSMISSION Symptom NO SPEEDOMETER OPERATION POSSIBLE CAUSES NO SPEEDOMETER OPERATION ACTION APPLICABILITY With the DRBIII check the pinion factor setting in the TCM All Is the pinion factor missing or set incorrectly Yes One possible cause is the pinion factor is not set is set incorrectly in the TCM Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 153 TRANSMISSION Symptom TRANSMISSION NOISY WITH NO DTC S PRESENT POSSIBLE CAUSES INCORRECT FLUID LEVEL INTERNAL TRANSMISSION PROBLEM NOISY INTERNAL TRANSMISSION PROBLEM NOISY WHILE STANDING STILL ACTION APPLICABILITY Check the Transmission Fluid Level per the Service I nformation Is the fluid level OK Yes GoTo 2 No
125. cking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM No Test Complete 117 TRANSMISSION Symptom P1788 2 4 HYDRAULIC PRESSURE TEST FAILURE E When Monitored and Set Condition 1788 2 4 HYDRAULIC PRESSURE TEST FAILURE When Monitored n any forward gear with engine speed above 1000 RPM shortly after a shift and every minute thereafter Set Condition After a shift into a forward gear with engine speed gt 1000 RPM the TCM momentarily turns on element pressure to the dutch ckts that don t have pressure to identify the correct pressure sw closes If the pressure sw does not dose 2 times the code sets POSSIBLE CAUSES LOSS OF PRIME P1791 PRESENT RELATED DTC S PRESENT TRANSMISSION FLUID LEVEL INTERMITTENT WIRING AND CONNECTORS TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN 2 4 PRESSURE SWITCH SENSE CIRCUIT OPEN 2 4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND 2 4 PRESSURE SWITCH SENSE C
126. controller pulses the 12 volt TRD signal from the PCM to ground during torque managed shifts with the throttle angle above 54 degrees The TRD system is also tested whenever the vehicle is stopped and the engine speed is at idle Set Condition This code 15 set when the Transmission Control Module sends two subsequent torque reduction messages to the Powertrain Control Module PCM via the TRD link circuit and does not receive a confirmation from the PCM over the communica tion bus POSSIBLE CAUSES RELATED DTC S PRESENT INTERMITTENT WIRING AND CONNECTORS TORQUE MANAGEMENT REQUEST SENSE CIRCUIT OPEN TORQUE MANAGEMENT REQUEST SENSE SHORT TO GROUND TORQUE MANAGEMENT REQUEST SENSE CIRCUIT SHORT TO VOLTAGE PCM TRD LINK TCM TRD LINK ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Posi
127. cord all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII9 read Transmission DTC s If any of these DTC s are present perform their respective tests first Are DTC s P1791 P0715 P0720 P1794 P1720 present also Yes Refer to appropriate symptom in the Transmission category If any of these DTC s are present they will cause a gear ratio error Go to test for P1791 first if it is present GoTo 3 59 TRANSMISSION 736 RATIO ERROR IN REVERSE Continued ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems All Check and adjust the fluid level per the Service Information If the fluid level is low locate and repair the leak before returning the vehicle to the customer With the DRBIII9 perform the Reverse gear clutch test Follow the instructions on the DRBIII Increase the throttle angle TPS Degree to 30 for no more than a few seconds CAUTION Do not overheat the Transmission Did the dutch test pass Input Speed remain at 0 Yes GoTo 4 No GoTo 5 The conditions to set this DTC are not present a
128. d and Set Condition P1776 SOLENOID SWITCH VALVE LATCHED IN LR POSITION When Monitored Continuously when doing partial or full EMCC PEMCC or FEMCC Set Condition This DTC will set if the senses the L R Pressure Switch closing while performing PEMCC or FEMCC or after two unsuccessful attempts to perform PEMCC or FEMCC POSSIBLE CAUSES INCORRECT FLUID LEVEL RELATED DTC P1784 PRESENT INTERMITTENT OPERATION TRANSMISSION RELAY OUTPUT CIRCUIT OPEN L R PRESSURE SWITCH SENSE CIRCUIT OPEN L R PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND L R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE INTERNAL TRANSMISSION SOLENOID SWITCH VALVE STUCK TCM SOLENOID SWITCH VALVE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTC s Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check
129. d connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 104 TRANSMISSION P1781 OD PRESSURE SWITCH SENSE CIRCUIT Continued ACTION APPLICABILITY With the DRBIII9 read Transmission DTC s Are there any Transmission Control Relay related DTC s P1765 1767 or 1768 present Yes Refer to symptom list and perform the appropriate test for Transmission Relay related DTC s Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter 2 or less for P1781 Yes gt GoTo 4 No GoTo 11 Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Note Check connectors
130. d snap ring hard code at heavy throttle gt Failed or intermittent slipping UD clutch may also set code P0731 51 and or P0732 52 UD seal leakage intermittent Worn input clutch hub bushing hard code at heavy throttle Sticky UD accumulator seals intermittent Worn reaction shaft support seal rings hard code at heavy throttle GENERAL INFORMATION Solenoid pack UD pressure in 4th gear Code P0734 54 Excludes geartrain failures which should be obvious upon disassembly gt f code P1791 35 is also set follow diagnostic procedure for code P 1791 35 first gt Failed or slipping OD clutch may also set code P0733 53 OD and Reverse inner and outer lip seal leak age usually hard code Sticky OD accumulator seals intermittent Worn reaction shaft support seal rings hard code at heavy throttle Broken OD UD tapered snap ring hard code at heavy throttle Failed or slipping 2 4 dutch may also set code P0732 52 2 4 seal leakage intermittent Sticky accumulator seals intermittent Codes P0715 56 and P0720 57 gt Failed input or output speed sensor intermittent or hard code gt Shorted or open wiring between and speed sensor s intermittent gt Connector problems at 60 connector and or Speed sensor connector Code P 1794 58 gt Open or shorted speed sensor ground speed sensor ground is different from chassis ground gt Open or shorted T
131. dicate No Bus or is there any evidence of an overall vehide bus problem Yes Refer to the Communications category for the related symp tom s Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 79 TRANSMISSION P1716 BUS COMMUNICATION WITH PCM Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII9 erase TCM DTC s Start the engine in park With the DRBIII read Transmission DTC s Did the DTC P1716 return Yes Replace the WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 80 TRANSMISSION Symptom P1717 NO COMMUNICATION WITH THE MIC When Monitored and Set Condition P1717 NO COMMUNICATION WITH THE MIC When Monitored Continuously with engine running Set Condition The code sets in approximately 25 seconds if no BUS messages are received form the MIC POSSIBLE CAUSES OTHER BUS PROBLEMS PRESENT INTERMITTENT WIRING AND CONNECTORS MIC NO COMMUNICATION TCM BUS COMMUNICATION
132. e stricted or if a customer drives aggressively in low gear the calculated oil temperature will be inaccu rate Consequently the shift schedule selected may be inappropriate the current conditions The key highlights of the various shift schedules are as follows Extreme Cold Oil temperature at start up below 26 6 16 gt Goes to Cold schedule above 24C 12 F oil temperature gt Park Reverse Neutral and 2nd gear only pre vents shifting which may fail a dutch with fre quent shifts Cold Oil temperature at start up above 24C 12 F and below 2 2C 36 F gt Goes to a Warm schedule above 4 4C 40 F oil temperature gt Delayed 2 3 upshift approximately 35 50 K m h 22 31 MPH gt Delayed 3 4 upshift 72 85 Km h 45 53 MPH gt Early 4 3 coastdown shift approximately 48 Kmyh 30 MPH gt Early 3 2 coastdown shift approximately 27 Km h 17 MPH gt High speed 4 2 3 2 2 1 kickdown shifts are prevented gt NoEMCC Warm Oil temperature at start up above 2 2C 36 F and below 27C 80 F gt Goes to a Hot schedule above 27C 80 F oil temperature gt Normal operation upshifts kickdowns coastdowns gt NoEMCC Hot Oil temperature at start up above 27C 80 F gt Goes to a Overheat schedule above 115C 240 F oil temperature gt Normal operation upshifts kickdowns and coastdowns gt Full No PEMCC except to engage FEMCC
133. e 58 sets after a TCM reset in neutral and Nt No equals a ratio of input to output of 2 50 A hard code sets within 3 seconds an intermit tent code sets within 15 seconds Theory of operation The transmission system uses two speed sensors one to measure input RPM and one to measure output RPM These inputs are essential for proper transmission operation There fore the integrity of this data is verified through the following checks 1 When in gear if the gear ratio does not compare to a known gear ratio the corresponding in gear trouble code is set codes 50 through 54 An excessive change in input or output speeds indicating signal intermittent will result in codes 56 and or 57 being set After a TCM reset in neutral observing erratic output and input speed sensor signals indicates a loss of the common speed sensors ground This sets a code 58 Transmission Effects The transmission will not go into relay open limp in mode until three gear ratio error events occur in a given key start This allows for intermittent problems to correct them selves without opening the relay However if a gear ratio error develops a code is always set but if the condition corrects itself the transmission will con tinue without requiring theignition key to be cycled on and off Many different events could occur given the range of failures possible for codes 50 through 58 The following are a few examples Codes 51 52 53 54 56 and
134. e angle and vehicle speed A short period of time after the gear substi tution the transmission will return to normal op erating mode If the transmission is shifted back into 1st or 3rd gear through normal operation and the 2 4 pressure switch remains closed 2nd or 4th gear will be substituted briefly and then resume normal operation If four gear substitutions occur in a given key start the transmission will go into relay open limp in mode f the 2 4 pressure switch is open indicating no 2 4 dutch pressure in 2nd or 4th gear the TCM sets code P1782 22 and continues with normal operation The transmission will only go into relay open limp in mode if a code 705 28 is also present If no 2 4 clutch pressure is present a speed ratio code P0732 52 or P0734 54 will be set and cause the limp in condition Possible causes gt If code P1791 35 is present ignore code P1782 22 and perform code P1791 diagnostic procedures gt 2 4 pressure switch sense circuit open or shorted to ground between TCM and solenoid pack gt 2 4 pressure switch sense circuit shorted to battery gt Solenoid pack gt Transmission overheated Excessive regulator valve leakage in valve body causing high line pressure which results in 2 4 solenoid blow off in 1st or 3rd gear May require new valve body if it happens only when hot gt Loose valve body bolts gt Plugged filter internal transmission or torque converter failure gt
135. e between ground and the TRS T42 Sense circuit in the TCM harness connector Is the resistance below 5 0 ohms Yes Repair the TRS T42 Sense circuit for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 21 36 TRANSMISSION 705 SHIFTER SIGNAL Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TRS harness connector Disconnect the TCM harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the TRS T42 Sense circuit at the TCM harness connector Is the voltage above 0 5 volt Yes Repair the TRS T42 Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 22 If there are no possible causes remaining view repair Repair Replace the WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 37 TRANSMISSION Symptom 715 SPEED SENSOR ERROR When Monitored and Set Condition PO715 INPUT SPEED SENSOR ERROR When Monitored The transmission gear ratio is monitored continuously while the transmission is in
136. e debris is present in the pan or valve body repair cause of debris as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 103 TRANSMISSION Symptom P1781 OD PRESSURE SWITCH SENSE CIRCUIT When Monitored and Set Condition P1781 OD PRESSURE SWITCH SENSE CIRCUIT When Monitored Whenever the engine is running Set Condition The appropriate DTC is set if one of the Pressure Switches are open or closed at the wrong time in a given gear POSSIBLE CAUSES TRANSMISSION RELAY DTCS PRESENT INTERMITTENT WIRING AND CONNECTORS TRANSMISSION RELAY OUTPUT CIRCUIT OPEN O D PRESSURE SWITCH SENSE CIRCUIT OPEN O D PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND O D PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE O D PRESSURE SWITCH INOPERATIVE TCM O D PRESSURE SWITCH APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIIIS read the engine Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring an
137. e maxi mum duty amp can t pull engine RPM within 60 RPM of input speed B Transmissions is in amp engine slips TCC gt than 100 RPM for 10 seconds POSSIBLE CAUSES RELATED DTC S PRESENT INTERMITTENT OPERATION INCORRECT FLUID LEVEL INTERNAL TRANSMISSION PROBLEM TCC OUT OF RANGE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIIIS read the engine Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the
138. ed by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 89 TRANSMISSION P1767 TRANSMISSION RELAY ALWAYS ON Continued APPLICABILITY With the DRBIII9 check the STARTS SINCE SET counter Note This counter only applies to the last DTC set Is the STARTS SINCE SET counter set to 0 Yes 3 No GoTo 7 Turn the ignition off to the lock position Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Measure the resistance between the Fused circuit and the Transmission Control Relay Output Circuit in the relay Is the resistance above 5 0 ohms Yes GoTo 4 No Replace the Transmission Control Relay Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Remove the Transmission Control Relay from the IPM Ignition on engine not running Note Check connectors Clean repair as necessary Measure the voltage of the Transmission Relay Control circuit in the IPM connector Is the voltage above 0 5 volt Yes Repair Transmission Relay Control Circuit for a short to voltage Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 6 If there are no possible causes remaining view repair Repair Replace the WITH THE DRBIII PERFORM QUICK LE
139. elated to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 127 TRANSMISSION P1792 BATTERY WAS DISCONNECTED continued ACTION APPLICABILITY Turn ignition off to the lock position Disconnect the TCM harness connector Ignition on engine not running Measure the voltage of the Fused B circuit in the TCM harness connector Is the voltage below 10 0 volts Yes gt GoTo 3 No 5 Turn the ignition off to the lock position Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Ignition on engine not running Using a 12 volt test light connected to ground check the Fused circuit in the TCM harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes gt GoTo 4 No Repair the Fused B circuit for a open or high resistance If the fuse is open make sure to check for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Has the Quick Learn procedure been performed Yes Thisisthecauseof the DTC ErasetheDTC and return vehideto customer Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 Has the battery been disconnected lost it s charge or been replaced recently Yes Thisisthecauseof the DTC ErasetheDTC and return vehide to customer Perform 41 TRANSMISSION V
140. em open or short to ground battery in PCI bus circuit pin 43 internal failure of any module or component on the bus Each diagnostic trouble code is diagnosed by following specific testing sequence The diagnostic test procedures contain step by step instructions for determining the cause of a transmission diag nostic trouble code Possible sources of the code are checked and eliminated one by one It is not neces sary to perform all of the tests in this book to diagnose an individual code These tests are based on the problem being present at the time that the test is run testing should be done with a fully charged battery If the TCM records DTC that will adversely affect vehicle emissions it will request via the communication bus that the PCM illuminate the Malfunction Indicator Lamp MIL Although these GENERAL INFORMATION DTC s will be stored in the TCM immediately asa 1 trip failure it may take up to five minutes of accumulated trouble confirmation set the DTC and illuminate the MIL Three consecutive successful OBDII EURO STAGE 111 OBD trips or clearing the DTC s with a diagnostic tool DRBIII9 or equiv alent is required to extinguish the MIL When the TCM requests that the PCM illuminate the MIL the PCM sets a DTC 700 89 to alert the techni that there DTC s in the TCM This must also be erased in the PCM in order to extinguish the MIL 3 3 1 HARD CODE Any Diagnostic Trou
141. emperature Sensor wiring to TRS gt TRS Will also set code P1799 74 gt Name of code P1796 70 Autostick Sensor Cir cuit If equipped Note RS is a MUXED Autostick system When monitored Whenever the engine is run ning Set condition 1 The transmission shift lever is not in AutoStick and either the upshift or downshift switch is closed 2 Upshift and downshift switches closed at the same time Theory of operation In the AutoStick Mode manual shift mode upshifts and downshifts are actuated manually Shift requests are detected by monitoring the MUXED upshift and downshift switches The Transmission Control Module monitors the above set conditions A set condition will be tolerated for up to 15 seconds before setting a code Transmission Effects The OD position shift schedule is substituted while operating in the au tostick gear selector position No limp in mode occurs Possible causes gt Wiring or connector problems gt AutoStick switch failure gt Name of code P1797 71 Manual Shift Overheat When monitored Whenever the engine is run ning Set condition 1 If the engine temperature ex ceeds 124C 255 F while operating in AutoStick mode 2 If the transmission temperature exceeds 135C 275 F while in AutoStick mode Theory of operation Transmission and engine temperatures are monitored during vehicle opera tion If conditions occur causing the engine or
142. er Clutch PLU Partial Lockup REV Reverse Clutch SLPK Solenoid Pack SSV Solenoid Switch Valve SW Switch TCC Torque Converter Clutch TCM Transmission Control Module TP Throttle Position TRD Torque Reduction TRS Transmission Range Sensor UD Underdrive Clutch 2 4 2nd and 4th gear Clutch or Pres sure Switch 6 2 DEFINITIONS OBDII EURO STAGE OBD Trip A vehicle start and drive cycle such that all once per trip diagnostic monitors have run Key Start A vehicle start and run cycle of at least 20 seconds Warm up Cycle vehicle start and run cycle such that the engine coolant must rise to at least 71 160 F and must rise by at least 4 4C 40 F from initial start up To count as a warm up cycle no DTC may occur during the cycle NOTES 22 7 0 DIAGNOSTIC INFORMATION AND PROCEDURES TRANSMISSION Symptom 120 POSITION SENSOR SIGNAL CIRCUIT When Monitored and Set Condition P0120 THROTTLE POSITION SENSOR SIGNAL CIRCUIT When Monitored Whenever the engine is running Set Condition This code is set if the throttle angle goes out of range or if throttle angle changes abruptly i e faster than the throttle body motion could occur POSSIBLE CAUSES RELATED PCM DTC S PRESENT INTERMITTENT WIRING amp CONNECTORS SENSOR GROUND CIRCUIT OPEN TO TCM TPS SIGNAL CIRCUIT OPEN TO TCM TPS VOLTAGE CHANGE NOT SMOOTH TCM TPS SIGNAL CIRCUIT APPLICABILITY NOTE Low
143. er Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Ignition on engine not running Using the Transmission Simulator set the rotary knob to the 3000 1250 position Turn the Input Output switch to ON With the DRBIII read the Input RPM and Output RPM Does the Input RPM read 3000 and the Output RPM read 1250 47 50 RPM Yes GoTo 4 No 5 If there are no possible causes remaining view repair Repair Replace the Output Speed Sensor Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Output Speed Sensor harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Output Speed Sensor Signal circuit from the TCM harness connector to the Output Speed Sensor harness connector Is the resistance above 5 0 ohms Yes Repair the Output Speed Sensor Signal circuit for an open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Output Speed Sensor harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Speed Sensor Ground circuit from the TCM harness connector to the Output Speed Sen
144. es that are operated by the powertrain and body controllers will not function properly 4 3 4 BULLETINS AND RECALLS The service procedures contained in this manual are correct provided that all applicable Safety Recalls and Technical Service Bulletins have been performed 5 0 REQUIRED TOOLS AND EQUIPMENT gt DRBIII9 diagnostic read out box Must be at latest release level gt Transmission Simulator Miller 8333 Transmission Simulator Miller 8333 1 Adapter harness kit and panel overlay for FWD vehicles gt Jumper wires gt Test Light minimum of 25 ohms of resistance gt Ohmmeter gt Voltmeter gt Pressure gauge 0 300 PSI 6 0 GLOSSARY OF TERMS 6 1 ACRONYMS BCM Body Control Module CKT Circuit CVI Clutch Volume Index DLC Data Link Connector DRBIII Diagnostic Readout Box DTC Diagnostic Trouble Code EATX Electronic Automatic Transaxle EMCC Electronically Modulated Converter Clutch FCM Front Control Module part of the IPM system 10 Ignition off draw IPM Intelligent Power Module IRT Intelligent Recovery Timer ISS Input Speed Sensor LED Light Emitting Diode LR Low reverse Clutch or Pressure Switch LU Lockup 21 GENERAL INFORMATION MIC Mechanical Instrument Cluster MIL Malfunction Indicator Lamp OBDII On Board Diagnostics OD Overdrive Clutch or Pressure Switch OSS Output Speed Sensor PCM Powertrain Control Module PEMCC Partial Electronically Modulated Convert
145. f the TRS T3 Sense dircuit at the TCM harness connector Is the voltage above 0 5 volt Yes Repair the TRS Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 14 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TRS harness connector Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistance of the TRS T41 Sense circuit from TCM connector to the TRS connector Is the resistance above 5 0 ohms Yes Repair the TRS T41 Sense circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 16 Turn the ignition off to the lock position Disconnect the TRS harness connector Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the TRS T41 Sense circuit in the TCM harness connector Is the resistance below 5 0 ohms Yes Repair the TRS T41 Sense circuit for a short to ground Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 17 35 TRANSMISSION 705 SHIFTER SIGNAL Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnec
146. ff to the lock position Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused B circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit in the Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes 7 No Repair the Transmission Control Relay Output circuit for an open or high resistance Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 108 TRANSMISSION P1782 2 4 PRESSURE SWITCH SENSE CIRCUIT Continued APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the 2 4 Pressure Switch Sense circuit from the harness connector to the Transmission Solenoid Pressure Switch Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the 2 4 Pressure Switch Sen
147. fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII9 check Powertrain Control Module DTC s Are any of the following P codes P0122 P0123 P0121 stored in the PCM Yes Refer to the Driveability category for the related symptom s Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No
148. form the 2nd gear clutch test Follow the instructions on the DRBIII Increase the throttle angle TPS Degree to 30 for no more than a few seconds CAUTION Do not overheat the transmission Did the dutch test pass Input speed remain at 0 Yes gt GoTo 4 No GoTo 5 The conditions to set this DTC are not present at this time Check the gearshift linkage adjustment Gear ratio DTC s can be set by problems in the Input and Output Speed Sensor circuits If the vehicle passes the clutch test and still sets Gear Ratio DTC s check the Speed Sensors for proper operation NOTE Remove the Starter Relay from the PDC This will prevent the vehicle from being started in gear Check the Speed Sensor wiring and connectors for good connection then perform a wiggle test using the Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 This DTC can also be set under extreme temperature conditions this is usually caused by an internal problem Verify if the problem is only experienced under extreme hot or cold conditions Were there any problems found Yes Repair as necessary Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No Test Complete With the DRBIII9 read Transmission DTC s Is a DTC P1788 2 4 Hydraulic Pressure Switch and or P 1782 2 4 Pressure Switch present also Yes Replace Solenoid Pressure switch assembly Perform 41TE TRANSMISSION VERIFICATION TEST
149. gnal circuit for an open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 143 TRANSMISSION P1799 CALCULATED OIL TEMP IN USE Continued APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the TRS harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the Speed Sensor Ground circuit in the TCM harness connector 15 the voltage above 0 5 volt Yes Repair Speed Sensor Ground circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 7 If there are no possible causes remaining view repair Repair Replace the WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair If the temperature readings are correct with the simulator in stalled the problem must be internal Replace TRS assembly as required Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Remove the Transmission Control Relay from
150. h the DRBIII read the engine 5 Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII9 check for other Transmission DTCs Is the DTC P1791 present also Yes Refer to symptom list and perform test for P1791 Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 3 With the DRBIII9 read Transmission DTC s Is the DTC P0733 and or P1781 present also Yes Replace Transmission or Solenoid Pressure Switch Assembly Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 4 With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set
151. hanical causes should be consid ered Transmission Effects None Possible causes Mechanical causes as listed under associated gear ratio code Name of code P1775 37 Solenoid Switch Valve Latched in TCC Position When monitored During an attempted shift into 1st gear Set condition This code is set if three unsuccess ful attempts are made to get into 1st gear in one given key start Theory of operation The solenoid switch valve SSV controls the direction of the transmission fluid when the L R TCC solenoid is energized The SSV will bein the downshifted position in 1st gear thus directing the fluid to the L R dutch circuit In 2nd 3rd and 4th it will bein the upshifted position and directs the fluid into the torque converter dutch TCC When shifting into 1st gear special hydraulic Sequence is performed to ensure SSV movement into the downshifted position The L R pressure switch is monitored to confirm SSV movement If movement is not confirmed the L R pressure switch does not close 2nd gear is substituted for 1st Transmission Effects Transmission will have no lst gear 2nd gear will be substituted and no EMCC operation Possible causes gt PRNDL indicates a valid OD codein the hydrau lic reverse positi on gt Valve body Solenoid valve stuck in TCC posi tion gt High idle speed gt Solenoid malfunction L R pressure switch will not dose gt L R Pressure Switch Sense circuit shorted
152. harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the L R Pressure Switch Sense drcuit in the TCM harness connector 15 the voltage above 0 5 volt Yes Repair the L R Pressure Switch Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 11 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Test drive the vehide Did you experience any 2nd gear launches or no TCC engagement Yes Inspect the valve body for signs of a stuck valve or other problem in the SSV area If no problems are found replace the Solenoid Pressure Switch Assembly If excessive debris is Present in the pan or valve body repair cause of debris as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 99 TRANSMISSION Symptom P1776 SOLENOID SWITCH VALVE LATCHED IN LR POSITION When Monitore
153. he PCM harness connector 15 the voltage between 4 5 and 5 5 volts Yes Replace and program the Powertrain Control Module in accor dance with the Service Information Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 7 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 49 TRANSMISSION 0725 SPEED SENSOR CIRCUIT 3 5L continued APPLICABILITY The conditions necessary to set the DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits Check the power and ground circuits of the Transmission Control Module Check the vehicles battery condition Were any problems found Yes Repair wiring and or connectors as necessary Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 50 TRANSMISSION Symptom PO731 GEAR RATIO ERROR IN 1ST When Monitored and Set Condition PO731 GEAR RATIO ERROR IN 1ST When Monitored The Transmission Gear Ratio is monitored continuously while the Transmission is in gear Set Condition If the ratio of the input RPM to the output RPM does not match the current Gear Ratio POSSIBLE CAUSES RELATED DTC S PRESENT INTERMITTENT GEAR R
154. he transmission Did the dutch test pass Input Speed remain at 0 Yes GoTo 4 No gt GoTo 5 caused by an internal problem Verify if the problem is only experienced under extreme hot or cold conditions Were there any problems found Yes Repair as necessary Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No Test Complete With the DRBIII9 read Transmission Isa DTC P1788 2 4 Hydraulic Pressure Switch and or P 1782 2 4 Pressure Switch present also Yes Replace the Solenoid Pressure switch assembly Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 6 If there are no possible causes remaining view repair Repair Repair internal transmission problem If the transmission is to be repaired check all of the components related to the Overdrive and 2 4 clutches Inspect the pump per service information and repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 The conditions to set this DTC are not present at this time Check the gearshift linkage adjustment Gear Ratio DTC s can be set by problems in the Input and Output Speed Sensor circuits If the vehicle passes the clutch test and still sets Gear Ratio DTC s check the Speed Sensors for proper operation NOTE Remove the Starter Relay from the PDC This will prevent the vehicle from being started in gear Check the Speed Sensor wiring and connectors for good connection then perform a wiggle test
155. hudder after a few thousand miles Yes Replace the Torque Convertor per the Service Information Note After replacing the Torque Convertor use the DRBIII to perform the TCC Break In procedure This will prevent possible shudder conditions Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 141 TRANSMISSION Symptom P1799 CALCULATED OIL TEMP IN USE When Monitored and Set Condition P1799 CALCULATED OIL TEMP IN USE When Monitored Whenever the engineis running The codeis set if any of the following conditions exist for three consecutive key starts The thermistor voltage is out of range below 0 70 volts or greater than 4 94 volts Set Condition lf continuos erratic thermistor voltage is sensed The thermistor temper ature stays below 80 degree s F ahrenheit for an extended period time POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS SPEED SENSOR GROUND CIRCUIT OPEN TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGE TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE TRANSMISSION TEMPERATURE SENSOR INOPERATIVE TCM HI TRANSMISSION TEMPERATURE SENSOR TCM LO TRANSMISSION TEMPERATURE SENSOR ACTION APPLICABILITY NOTE Low fluid level be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the f
156. icle using the PCI bus It relies on certain information to function properly The TCM continuously monitors the PCI bus to check for messages broadcast from the cer tain modules Transmission Effects Possible improper TCM AutoStick configuration and delayed 3 4 shifts No EMCC and early 3 4 shifts for a few minutes after engine is started Possible causes gt Open or shorted PCI bus circuit from BCM gt Name of code P1714 79 Low Battery Voltage When monitored Continuously with engine run ning and Transmission Relay energized Set condition If the voltage sensed at the Trans mission Control Relay Output circuit pins 16 and 17 at TCM for 15 seconds Theory of operation The Transmission system requires sufficient battery voltage in order to ener gize the transmission solenoids The TCM continu ously monitors the voltage available to the sole noids Transmission Effects At speeds above 72 Km h 45 MPH the transmission system will default to neutral Below 72 Km h 45 MPH the transmission system will default to relay open limp in mode Park Reverse and Neutral are still available Possible causes gt Charging system problem gt Poor High resistance connection between and Battery Alternator gt pin 16 and 17 high resistance or poor connection gt ground pins 53 and 57 high resistance or poor connection gt High resistance in Transmission Control Relay contacts gt
157. id false symptoms With the DRBIII read the engine Check and repair all engine DTC s prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII9 Check the STARTS SINCE SET counter Note This counter only applies to the last DTC set Is the STARTS SINCE SET counter for P1765 set at 0 Yes gt GoTo 3 No GoTo 7 86 TRANSMISSION P1765 SWITCHED BATTERY Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connec
158. ilures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 72 TRANSMISSION P0765 UD SOLENOID CIRCUIT Continued ACTION APPLICABILITY With the DRBIII read Transmission Control Module DTC s Are there any Transmission Control Relay related DTC s P1765 P1767 or P1768 present Yes Refer to symptom list and perform the appropriate symptom for Transmission Control Relay related DTC s Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter for P0765 set at 0 Yes gt GoTo 4 No GoTo 11 Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Trans
159. ing occurs gt Cooling system failure causing engine to operate over 110C 230 F gt Engine coolant temperature stays low too long f engine coolant temperature drops below 65C 150 F the transmission will disengage Extended operation with the EM CC disengaged will cause the transmission to overheat gt brake switch issue will cause the EMCC to disengage Extended operation with the EMCC disengaged will cause the transmission to over heat gt Transmission fluid overfilled gt Transmission cooler or cooler lines restricted gt Transmission Temperature Sensor circuit 3 3 DIAGNOSTIC TROUBLE CODES Diagnostic trouble codes DTC s are codes stored by the Transmission Control Module TCM that help us diagnose Transmission problems They are viewed using the DRBIII scan tool Always begin by performing a visual inspection of the wiring connectors cooler lines and the trans mission Any obvious wiring problems or leaks should be repaired prior to performing any diagnos tic test procedures Some engine driveability prob lems can be misinterpreted as a transmission prob lem Ensure that the engine is running properly and that no PCM DTC s are present that could cause a transmission complaint If there is a communication bus problem trouble codes will not be accessible until the problem is fixed The DRBIII9 will display an appropriate message The following is a possible list of causes for a bus probl
160. ing the vehicle Normal operation is resumed if the power is restored during the same key start Possible causes gt Battery voltage removed from TCM gt TCM disconnected gt Dead Battery gt Low battery voltage during cranking gt Battery Disconnect by DRBIII or MDS gt Bad TCM ground circuit Name of code P1767 14 Relay Output Always On When monitored Ignition key is turned from off position to run position and or ignition key is turned from crank position to run position Set condition This code is set if the Transmission Control Module TCM senses greater than 3 volts at the Trans Relay Output switched battery ter minal of the TCM prior to the TCM energizing the relay Theory of operation The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode When the relay is off no power is supplied to the solenoid pack and thetransmission is in limp in mode The relay output is fed back to the TCM through pins 16 and 17 It is referred to as the Trans Relay Output circuit or switched battery Transmission Effects The MIL will illuminate and the transmission system defaults to Logical limp in mode Logical Limp in mode results in the same modes of operation as Relay Open Limp in Since the relay is stuck on the TCM can not open the relay and the TCM shifts to 2nd gear Possible causes gt Relay failure welded contacts gt Sh
161. inute thereafter Set Condition After a shift into a forward gear with engine speed gt 1000 RPM the TCM momentarily turns on element pressure to the dutch ckts that don t have pressure to identify the correct pressure sw closes If the pressure sw does not dose 2 times the code sets POSSIBLE CAUSES CONDITION P1789 PRESENT ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applica
162. ion Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM No Test Complete 109 TRANSMISSION Symptom P1784 LR PRESSURE SWITCH SENSE CIRCUIT When Monitored and Set Condition P1784 LR PRESSURE SWITCH SENSE CIRCUIT When Monitored Whenever the engine is running Set Condition The appropriate DTC is set if one of the Pressure Switches are open or closed at the wrong time in a given gear POSSIBLE CAUSES LOSS OF PRIME DTC P1791 PRESENT TRANSMISSION CONTROL RELAY DTCS PRESENT TCM AND WIRING L R PRESSURE SWITCH INTERMITTENT WIRING AND CONNECTORS TRANSMISSION RELAY OUTPUT CIRCUIT OPEN L R PRESSURE SWITCH SENSE CIRCUIT OPEN L R PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND L R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE TCM L R PRESSURE SWITCH CIRCUIT ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engi
163. is moved to the N position all PRNDL lights will illuminate and then back to the OD position and held there for at least 3 seconds in order to resume the normal OD shift schedule and electronic display gt Intermittent C1 through C4 T1 T3 T41 T42 circuits Check for corrosion terminal push outs or spread terminals at 60 way and or TRS con nector gt TRS gt gt These same symptoms may occur without the code P0705 28 getting set It is possible that the invalid code that was sensed by the TCM only occurred once or twice duringthe given ignition key start and or did not last for longer than 0 1 second GENERAL INFORMATION Name of code P0120 29 Throttle Position Sen sor Signal When monitored Whenever the engine is run ning Set condition This 15 set if thethrottle angle goes out of range or if throttle angle changes abruptly ie faster than the throttle body motion could occur Theory of operation The Transmission Control Module receives the throttle position signal from the Throttle Position Sensor TPS through a wire spliced into the TPS circuit to the PCM The TPS has a 5 volt pull up supplied from the Power train Control Module PCM The signal is checked for out of range as well as an intermittent exces sive signal changes Transmission Effects Extremely erratic trans mission shifting with an intermittent TPS signal just prior to setting the code If the in
164. itch Output Start circuit in the TCM harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes 6 No Repair the Fused Ignition Switch Output Start circuit for an open or high resistance If thefuse is open make sureto check for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Note Reinstall the Starter Relay 76 TRANSMISSION P1714 LOW BATTERY VOLTAGE Continued ACTION APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Using a 12 volt test light connected to 12 volts check the ground circuits in the TCM harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly at all ground circuits Yes GoTo 7 No Repair the Ground 5 for an open or high resistance Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Ignition on engine not running Using 12 volt test light connected to ground check the Fused circuit in the TCM harness connector NOTE The test light must illuminate brigh
165. ition Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Using a 12 volt test light connected to 12 volts check the Transmission Control Relay Ground circuit NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes 6 No RepairtheTransmission Control Relay Ground circuit for an open or high resistance Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Remove the Transmission Control Relay from the IPM Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Transmission Control Relay Control circuit between 93 TRANSMISSION P1768 RELAY OUTPUT ALWAYS OFF continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit Ignition on engine not running Using a 12 volt test light connected to ground check thethree Transmission Control Relay Output circuits NOTE Therearethree Transmission
166. ky UD accumulator seals intermittent Worn reaction shaft support seal rings hard code at heavy throttle Solenoid pack UD pressure in 4th gear gt Failed or slipping LR dutch may also set code P0736 56 or have no Reverse LR seal leakage I ntermittent Sticky LR accumulator seals I ntermittent Code P0732 52 Exdudes geartrain failures which should be obvious upon disassembly gt code P1791 35 is also set follow diagnostic procedure for code 1791 35 first gt Failed or slipping 2 4 clutch may also set code P0734 54 2 4 seal leakage intermittent Sticky accumulator seals intermittent gt Failed or intermittent slipping UD clutch may also set code P0731 51 and or P0733 53 UD seal leakage intermittent Worn input clutch hub bushing hard code at heavy throttle Sticky UD accumulator seals intermittent Worn reaction shaft support seal rings hard code at heavy throttle Solenoid pack UD pressure in 4th gear Code P0733 53 Exdudes geartrain failures which should be obvious upon disassembly gt f code P1791 35 is also set follow diagnostic procedure for code 1791 35 first gt Failed or slipping OD dutch may also set code P0734 54 OD and Reverse inner and outer lip seal leak age usually hard code Sticky OD accumulator seals intermittent Worn reaction shaft support seal rings hard code at heavy throttle Broken OD UD tapere
167. lated DTC s Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 With the DRBIII Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter 2 or less Yes gt GoTo 5 No GoTo 1 Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the PDC This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Note Check connectors Clean repair as necessary Ignition on engine not running On the Transmission Simulator select L R on the Pressure Switch selector switch With the DRBIII9 monitor the L R Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator Did the Pressure Switch state change from OPEN to CLOSED when the test button was pressed Yes Replace the Solenoid Pressure Switch Assembly in accordance with the Service Information Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 111 TRANSMISSION P1784 LR PRESSURE SWITCH SENSE CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Transmission Contr
168. level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter set at 0 Yes gt GoTo 3 GoTo 8 48 TRANSMISSION 0725 SPEED SENSOR CIRCUIT 3 5L continued APPLICABILITY Turn the ignition off to the lock position Disconnect the PCM harness connector s Disconnect the TCM h
169. ll diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 96 TRANSMISSION P1775 SOLENOID SWITCH VALVE LATCHED IN TCC POSITION Continued ACTION APPLICABILITY With the DRBIII9 check for other Transmission DTC s Is DTC P1784 present also Yes Refer to symptom list and perform test for DTC P1784 Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 3 Perform a visual inspection of all connectors wiring and cooler connections before proceeding Repair as necessary With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter 2 or less Yes gt GoTo 4 No GoTo 12 Check the Transmission Fluid Level per the Service I nformation Is the Transmission Fluid Level at the proper level Yes 6 No Adjust fluid level and repair cause of incorrect fluid level Perform 41 TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Inspect the Solenoid Switch Valve per service information and repair or replace as necessary If no problems are found replace the Transmission Solenoid Pressure Switch assembly per Service Inform
170. lse symptoms With the DRBIII read the engine DTC s Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 This is an informational DTC only Check the Engine and Transmission Cooling Systems for proper operation Check the Radiator Cooling Fan operation Check the Transmission Cooling Fan operation if equipped Check the Transmission Fluid Level Make sure it is not overfilled NOTE Aggressive driving or driving in low for extended periods of time in Autostick mode will set this DTC Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test C
171. luid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine Check and repair all engine DTC s prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 142 TRANSMISSION P1799 CALCULATED OIL TEMP IN USE Continued ACTION APPLICABILITY With the DRBIII Check the STARTS SINCE SET counter All NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter 2 or less Yes gt GoTo 3 No GoTo 12 Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle f
172. m List for appropriate Symptom s No Repair is complete 157 VERIFICATION TESTS Verification Tests Continued POWERTRAIN VERIFICATION TEST VER 2 1 NOTE If the PCM has been replaced and the correct VIN and mileage have not been programmed a DTC will be set in the ABS Module Airbag Module and the SKIM 2 NOTE If the vehicle is equipped with a Sentry Key Immobilizer System Secret Key data must be updated Refer to the Service Information for the PCM SKIM and the Transponder ignition key for programming information 3 Inspect the vehicle to ensure that all components related to the repair are connected properly 4 With the DRBIII clear DTCs and Reset Memory all engine values 5 Run the engine for one warm up cycle to verify proper operation 6 Road test the vehicle Use all accessories that may be related to this repair 7 With the DRBIII9 confirm that no or Secondary Indicators are present and that all components are functioning properly 8 If this test is being performed after a No Trouble Code test verify the symptom is no longer present 9 If the symptom is still present or any other symptom or DTC is present refer to the appropriate category and perform the corresponding symptom 10 Refer to any Technical Service Bulletins that may apply 11 If there are no DTCs present and all components are functional properly the repair is complete Are any DTCs present Yes is
173. may then notice harsh bumps when the A C clutch is being cycled but vehicle shudder will be elimi nated After 35 OBDII EURO STAGE III warm up starts or if the code is deared PEMCC will be reactivated to see if shudder is still present If one shudder event occurs the code will be reset Clearing the code and running battery disconnect with the DRBIII9 is the only way to reset the shudder counter from 20 back to zero Transmission Effects This code does not cause the transmission to go into limp in mode However once the code is set FEMCC to PEMCC operation before the A C dutch engagement will be disabled for 35 OBDII EURO STAGE 111 warm up starts Possible causes gt Degraded transmission fluid gt Wheels severely out of alignment gt Internal torque converter problem Name of Code P 1799 74 Calculated Oil Temper ature in Use When Monitored When ever the Engine is run ning Set condition The code is set if any of the follow ing conditions exist for three consecutive key starts gt The Temperature Sensor voltage is out of range below 0 07 volts or greater than 4 94 volts gt f continuous erratic Temperature Sensor voltage is sensed gt The Temperature Sensor temperature stays be low 27C 80 F for an extended period of time Theory of Operation The TCM uses a Tempera ture Sensor to monitor the transmission sump tem perature This temperature is used to determine which
174. mission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Ignition on engine not running With the DRBIII actuate the UD Solenoid Monitor the UD Solenoid LED on the Transmission Simulator Miller tool 8333 Did the UD Solenoid LED on the Transmission Simulator blink on and off Yes gt GoTo 5 No GoTo 6 If there are no possible causes remaining view repair Repair Replace Transmission Solenoid Pressure Switch Assembly as re quired Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the used B circuit and Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit in the Transmission Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes gt GoTo 7 No Repair the Transmission Control Relay Output circuit for an open or high resistance Perform 41 TRANSMISSION VERIFICATION TEST VER 1 73
175. ms are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII9 read PCM DTCs Are there any PCM Throttle Position Sensor DTC s present Yes Repair all PCM Throttle Position Sensor DTCs before proceeding Refer to the driveability category for the appropriate symptom No GoTo 3 46 TRANSMISSION P0725 E NGINE SPEED SENSOR CIRCUIT 3 3L 3 8L Continued ACTION APPLICABILITY With the DRBIII9 Check the STARTS SINCE SET counter NOTE This counter only applies to the last DTC set Is the STARTS SINCE SET counter set at 0 Yes gt GoTo 4 No GoTo 7 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Crank Position Sensor harness connector Measure the resistance of the Crank Position Sensor Ground circuit between the TCM harness connector and the CKP harness connector 15 the resistance above 5 0 ohms Yes Repair the Crank Position Sensor Ground circuit for an open No GoTo 5 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Crank Position Sensor harness connector Measurethe resistance of the Crank Position Sensor Signal circuit between the TCM harness connector and the harness connector 15 the resistance above 5 0 ohms Yes Repair the
176. n an overfilled transmission Check the transmission fluid level per the service information Is the fluid level OK Yes Test Complete No Adjust fluid level Repair cause of incorrect fluid level 150 TRANSMISSION Symptom NO BACK UP LAMP OPERATION POSSIBLE CAUSES BCM BACK UP LAMP DRIVER OPEN DTC PRESENT BCM BACK UP LAMP DRIVER SHORTED DTC PRESENT BCM BUS PROBLEM IPM BUS PROBLEM LEFT REVERSE LAMP GROUND CIRCUIT OPEN LEFT REVERSE LAMP OPEN RIGHT REVERSE LAMP GROUND CIRCUIT OPEN RIGHT REVERSE LAMP OPEN TRS GROUND CIRCUIT OPEN TRS REVERSE SENSE CIRCUIT OPEN TO IPM ACTION APPLICABILITY With the DRBIII read the BCM DTCs Is the Back Up Lamp Driver Open DTC Present Yes Refer tothe Body category and perform the appropriate symptom diagnosis GoTo 2 With the DRBIII attempt to communicate with the BCM Can the DRBIII communicate with the BCM Yes gt GoTo 4 No Refer to the Communication category and perform the appropri ate symptom diagnosis With the DRBIII9 attempt to communicate with the IPM Can the DRBIII communicate with the IPM Yes 5 No Refer to the Communication category and perform the appropri ate symptom diagnosis With the DRBIII read the BCM DTCs All Is the Back Up Lamp Driver Shorted DTC Present Yes Refer tothe Body category and perform the appropriate symptom diagnosis No GoTo 3 151 TRANSMISSION NO BACK U
177. nce of the Input Speed Sensor Signal circuit from the harness connector to the Input Speed Sensor harness connector Is the resistance above 5 0 ohms Yes Repair the Input Speed Sensor Signal circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Input Speed Sensor harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Speed Sensor Ground circuit from the TCM harness connector to the Input Speed Sensor harness connector Is the resistance above 5 0 ohms Yes Repair the Speed Sensor Ground circuit for an open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 7 39 TRANSMISSION 715 1 SPEED SENSOR ERROR Continued APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Input Speed Sensor harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the Speed Sensor circuit Is the resistance Below 5 0 ohms Yes Repair the Input Speed Sensor Signal circuit for a short to ground Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 8 Turn the ignition off to the lock position Disconnect the Input Speed Sensor harness connector Disconnect the TCM harness connec
178. nd 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 This DTC is set along with a gear ratio DTC Perform the appropriate test for the Gear Ratio DTC stored NOTE Check 1 trip failures if there are no Gear Ratio DTC s current If there are no possible causes remaining view repair Repair Refer to Transmission symptom list for the appropriate gear ratio DTC test Perform 41 TRANSMISSION VERIFICATION TEST VER 1 123 TRANSMISSION Symptom 1791 1 055 OF PRIME When Monitored and Set Condition 1791 1055 OF PRIME When Monitored If the transmission is slipping in any forward gear and the pressure switches not indicating pressure loss of prime test is run Set Condition If the Trans begins to slip in a forward gear amp the press s
179. ne Check and repair all engine DTC s prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 110 TRANSMISSION P1784 LR PRESSURE SWITCH SENSE CIRCUIT Continued ACTION APPLICABILITY With the DRBIII check for other Transmission DTC s Is DTC P1791 present in addition to the DTC that you are diagnosing Yes Refer to DTC list and perform symptom for P1791 Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 3 With the DRBIII read Transmission DTC s Are there any Transmission Control Relay related DTC s P1765 1767 or 1768 present Yes Refer to symptom list and perform the appropriate test for Transmission Relay re
180. no more than a few seconds CAUTION Do not overheat the transmission Did the dutch test pass Input speed remain at 0 Yes gt GoTo 4 GoTo 5 The conditions to set this DTC are not present at this time All Check the gearshift linkage adjustment Gear ratio DTC s can be set by problems in the Input and Output Speed Sensor circuits If the vehicle passes the clutch test and still sets Rear Ratio DTC s check the Speed Sensors for proper operation NOTE Remove the Starter Relay from the PDC This will prevent the vehicle from being started in gear Check the speed sensor wiring and connectors for good connection then perform a wiggle test using the Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 This DTC can also be set under extreme temperature conditions this is usually caused by an internal problem Verify if the problem is only experienced under extreme hot or cold conditions Were there any problems found Yes Repair as necessary Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No Test Complete With the DRBIII9 read Transmission Isa DTC P1787 OD Hydraulic Pressure Switch and or P 1781 OD Pressure Switch present also Yes Replacethe Solenoid Pressure switch assembly Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 6 If there are no possible causes remaining view repair Repair Repair internal transmission p
181. not complete refer to appropriate symptom No Repair is complete 158 APPLICABILITY COMPONENT LOCATIONS o 8 0 COMPONENT LOCATIONS 8 1 POWERTRAIN CONTROL MODULE d N HOOD agan INTELLIGENT T POWER MODULE NSISTS amp R POWERTRAIN CONTROL MODULE L o T N S 80964236 ROME 2 SD 9 e 8 3 INTELLIGENT POWER MODULE FRONT WIPER NMOTOR CONNECTOR HOOD AJAR A NN eia CG INTELLIGENT lt e POWER MODULE ux CONSISTS OF POWERTRAIN CONTROL MODULE 80964236 159 COMPONENT LOCATIONS 80a676df 8 4 PRESSURE PORT LOCATIONS P OVERDRIVE TORQUE LOW REVERSE CLUTCH CONVERTER N OFF N C T C L A A UNDERDRIVE REVERSE CLUTCH CLUTCH 2 4 CLUTCH N S 8 5 THROTTLE POSITION SENSOR 2 4L 80a68314 8 6 AUTOSTICK OD OFF eta f 8059a49c 160 COMPONENT LOCATIONS 8 7 TRANSMISSION COMPONENT LOCATIONS INPUT SPEED SENSOR Nc e L o T N S c TRANSMISSION SOLENOID TRANSMISSION PRESSURE SWITCH ASSEMBLY RANGE SENSOR 80c07175 161 NOTES 162 9 0 CONNECTOR PINOUTS BLACK CONNECTOR PINOUTS AUTOSTICK SWITCH BLACK 2 WAY
182. nsmission system then Miscellaneous functions then Quick Learn Follow the procedure instructions displayed on the DRBIII 3 3 9 CLUTCH VOLUMES The L R dutch volume is updated when doing a 2 1 or 3 1 coast down shift The transmission tem perature must be between 21 49C 70 120 F The dutch volume should be between 35 and 83 The 2 4 dutch volume is updated when doing a 1 2 shift The transmission temperature must be above 43C 110 F The dutch volume should be between 20 and 77 The OD dutch volume is updated when doing a 2 3 shift The transmission temperature must be above 43C 110 F The dutch volume should be between 40 and 150 The UD dutch volume is updated when doing a 4 3 or 4 2 shift Thetransmission temperature must be above 4 110 F The clutch volume should be between 24 and 70 3 3 10 ELECTRONIC PINION FACTOR The transmission output speed signal supplies distance pulses to the powertrain control module PCM which are used to calculate speed and mileage A pinion factor is stored in the transmis sion control module TCM in order to provide the appropriate distance pulses for the vehide The pinion factor is programmed into the TCM at the assembly plant Using the following steps the pinion factor can be checked and or reset using the DRBIII 1 Select Transmission system then Miscellaneous functions then Pinion Factor The DRBIII9 will display the current tire size If thetiresizei
183. ntrol Relay connector in the IPM Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit in the Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes GoTo 8 No Repair the Transmission Control Relay Output circuit for an open or high resistance Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the L R Pressure Switch Sense circuit from the TCM harness connector to the Transmission Solenoid Pressure Switch Assembly harness connector 15 the resistance above 5 0 ohms Yes Repair the L R Pressure Switch Sense circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 9 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the L R Pressure Switch Sense circuit Is the resistance below 5 0 ohms Yes Repair L R Pressure Switch Sense circuit for a sh
184. o that of a direct connection to the battery Does the test light illuminate brightly Yes 8 No Repair the Transmission Control Relay Output circuit for an open or high resistance Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the L R Pressure Switch Sense circuit from the TCM harness connector to the Transmission Solenoid Pressure Switch harness connector Is the resistance above 5 0 ohms Yes Repair the L R Pressure Switch Sense circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 9 Turn ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the L R Pressure Switch Sense circuit Is the resistance below 5 0 ohms Yes Repair the L R Pressure Switch Sense circuit for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 10 98 TRANSMISSION P1775 SOLENOID SWITCH VALVE LATCHED IN TCC POSITION Continued APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM
185. ol Relay Output circuit and the Fused B circuit in the IPM Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit in the Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes 7 No Repair the Transmission Control Relay Output circuit for an open or high resistance If the fuse is open make sure to check for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the L R Pressure Switch Sense circuit from the TCM harness connector to the Transmission Solenoid Pressure Switch Assembly harness connector 15 the resistance above 5 0 ohms Yes Repair the L R Pressure Switch Sense circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 8 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the L R Pressure Switch Sense circuit in
186. ome problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 140 TRANSMISSION P1798 NORN OUT BURNT TRANSAXLE FLUID continued APPLICABILITY Turn the ignition off Remove the Transmission Oil Pan and Oil Filter per the Service Information Install a new Transmission Oil Filter per Service Information Reinstall Transmission Oil Pan and refill with new Transmission Fluid per the Service Information Note The Transmission Cooler must be flushed before prodceeding Start the engine check and adjust the Transmission Fluid Level per Service Information Allow the engine to idle for 10 minutes in Park Flush the Transmission Oil Cooler per the Service Information Turn the ignition off Drain and refill the Transmission Fluid Flush the Transmission Oil Cooler again Start the engine check and adjust the Transmission Fluid Level per Service Information With the DRBIII perform a Battery Disconnect Note This must be done to re enable EMCC during an A C Clutch engage ment The vehicle may exhibit intermittent shudder during the first few hundred miles Note The oil will gradually penetrate the TCC friction material and the shudder should disappear Erase the DTC and return the vehicle to the customer Did the Code reset or does the vehicle still s
187. omplete 139 TRANSMISSION Symptom P1798 WORN OUT BURNT TRANSAXLE FLUID EE When Monitored and Set Condition P1798 WORN OUT BURNT TRANSAXLE FLUID When Monitored With each transition from full Torque Convertor to partial Torque Convertor engagement for A C bump prevention Set Condition When vehicle shudder is detected during partial engagement PEMCC POSSIBLE CAUSES WORN OUT BURNT TRANSMISSION FLUID APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTC s Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module S
188. on The control system automat ically adapts to changes in engine performance and friction element variations to provide consistent shift quality The control system ensures that clutch operation during upshifting and downshifting is more responsive without increased harshness The Transmission Control Module TCM contin uously checks for electrical problems mechanical problems and some hydraulic problems When a problem is sensed the TCM stores a diagnostic trouble code Some of these codes cause the tran saxle to go into limp in or default mode While in this mode electrical power is taken away from the transaxle via the TCM de energizing the transmission control relay and tak ing power from the solenoid pack When this hap pens the only transaxle mechanical functions are Park and Neutral Reverse Second Gear No upshifts or downshifts are possible The posi tion of the manual valve alone allows the three ranges that are available Although vehicle perfor mance is seriously degraded while in this mode it allows the owner to drive the vehicle in for service Once the DRBIII is in the EATX portion of the diagnostic program it constantly monitors the TCM to see if the system is in limp in mode If the transaxleisin limp in mode the DRBIII amp will flash the red LED 3 2 1 AUTOSTICK FEATURE This feature allows the driver to manually shift the transaxle when the shift lever is pulled back into the AutoStick position
189. on This DTC is set if the Transmission Control Module senses greater than 3 volts at the Transmission Control Relay Output terminal of the TCM prior tothe TCM energizing the relay POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS TRANSMISSION CONTROL RELAY STUCK CLOSED TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORT TO VOLTAGE TRANSMISSION RELAY CONTROL CIRCUIT SHORT TO VOLTAGE TCM TRANSMISSION RELAY ALWAYS ON ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTC s Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are correct
190. ontinued APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the 2 4 Solenoid Control circuit from the TCM harness connector to the Solenoid Pressure Switch Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the 2 4 Solenoid Control circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 8 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the 2 4 Solenoid Control circuit Is the resistance below 5 0 ohms Yes Repair the 2 4 Solenoid Control circuit for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 9 15 the voltage above 0 5 volt Yes Repair the 2 4 Solenoid Control circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 10 If there are no possible causes remaining view repair Repair Replace the Transmission Control Module WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FAC TOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 The conditions
191. open Crank Position Sensor Signal circuit No GoTo 6 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR The conditions necessary to set the DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Check the power and ground circuits of the Transmission Control Module Start the engine With the DRBIII9 monitor the Engine RPM Wiggle the wire harness between the and CK P Were any problems found and or did the Engine RPM change while wiggling the harness Yes Repair wiring and or connectors as necessary No Test Complete 47 TRANSMISSION Symptom P0725 E NGINE SPEED SENSOR CIRCUIT 3 5L When Monitored and Set Condition P0725 E NGINE SPEED SENSOR CIRCUIT 3 5L When Monitored Whenever the engine is running Set Condition Engine RPM less than 390 or greater than 8000 for more than 2 seconds while the engine is running POSSIBLE CAUSES INTERMITTENT WIRING amp CONNECTORS CONDITIONS EATX RPM SIGNAL CIRCUIT OPEN EATX RPM SIGNAL CIRCUIT SHORTED TO GROUND EATX RPM SIGNAL CIRCUIT SHORTED TO VOLTAGE PCM INTERNAL CONTROLLER TCM INTERNAL CONTROLLER APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid
192. ort to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 10 102 TRANSMISSION P1776 SOLENOID SWITCH VALVE LATCHED IN LR POSITION Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused B circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the L R Pressure Switch Sense drcuit in the TCM harness connector 15 the voltage above 0 5 volts Yes Repair the L R Pressure Switch Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 11 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Test drive the vehide Did you experience any 2nd gear launches or no TCC engagement Yes Inspect the valve body for signs of a stuck valve or other problem in the SSV area If no problems are found replace the Solenoid Pressure Switch Assembly If excessiv
193. ort to battery in 12 volt supply and or Trans mission Control Relay Output circuit s gt Short to voltage gt connector problems gt Name of code 1768 15 Relay Output Always Off When monitored Continuously Set condition This code is set when less than 3 volts are present at the Trans Relay Output switched battery terminals at the Transmission Control Module TCM when the TCM is energizing the relay Theory of operation The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode When the relay is off no power is supplied to the solenoid pack and thetransmission is in limp in mode The relay output is fed back to the TCM through pins 16 and 17 It is referred to as the Trans Relay Output circuit or a switched battery GENERAL INFORMATION After a controller reset ignition key turned tothe run position or after cranking engine the control ler energizes the relay Prior to this the TCM verifies that the contacts are open by checking for no voltage at the switched battery terminals After the relay is energized the TCM monitors the ter minals to verify that the voltage is greater than 3 volts Transmission Effects The MIL illuminates and the transmission system defaults to Relay Open limp in mode Possible causes gt Relay failure intermittent relay function caused by oxidized or contaminated relay contacts gt Short
194. ot pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 57 TRANSMISSION PO734 GEAR RATIO ERROR IN 4TH Continued ACTION APPLICABILITY With the DRBIII9 read Transmission Control Module DTC s If any of these DTC s are present perform their respective tests first Are DTC s P1791 P0715 P0720 P1794 P1720 present also Yes Refer to appropriate symptom in the Transmission category If any of these DTC s are present they will cause a gear ratio error Go to test P1791 first if it is present Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 NOTE Low fluid level can be the cause of many transmission problems Check and adjust the fluid level per the Service Information If the fluid level is low locate and repair the leak before returning the vehicle to the customer With the DRBIII9 perform the 4th gear clutch test Follow the instructions on the DRBIII Increase the throttle angle TPS Degree to 30 for no more than a few seconds CAUTION Do not overheat t
195. pen or high resistance If the fuse is open make sure to check for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair 120 TRANSMISSION P1788 2 4 HYDRAULIC PRESSURE TEST FAILURE Continued APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the 2 4 Pressure Switch Sense circuit from the harness connector to the Transmission Solenoid Pressure Switch Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the 2 4 Pressure Switch Sense circuit or an open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 10 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the 2 4 Pressure Switch Sense circuit Is the resistance below 5 0 ohms Yes Repairthe 2 4 Pressure Switch Sense circuit for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 11 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmis
196. pplicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 124 TRANSMISSION P1791 LOSS OF PRIME Continued ACTION APPLICABILITY The Transmission Fluid temperature must be above 21 C or 70 F prior to checking fluid level Adjusting fluid level on a cold transmission will result in an overfilled transmission Check the Transmission Fluid Level per the Service Information Is the Transmission Fluid Level at the proper level Yes GoTo 3 No gt Ifthe Transmission Fluid is low repair any Transmission Fluid leak as necessary and adjust the Transmission Fluid Level in accordance with the Service I nformation Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Place the gear selector in park Start the engine The Transmission must be at operating temperature prior to checking pressure A cold Transmission will give higher readings Place the Transmission in Reverse With the DRBIII observe the Transmission Pressure Switch states Are any of the Pressure Switches dosed Yes GoTo 4 No GoTo 6 The conditions necessary to set this DTC are not present at this time Test drive the vehicle Allow the Transmission to shift through all gears and ranges Did you experience any Delayed Engagement and or No Drive condition Yes gt GoTo 6 No GoTo 5 The conditions necessary to set this DTC are not present at this time Using the schematics as a
197. r to checking fluid level Adjusting fluid level on a cold transmission will result in an overfilled Transmission Check the Transmission Fluid Level per the Service Information Is the Transmission Fluid Level at the proper level Yes gt GoTo 7 No Adjust fluid level Repair cause of incorrect fluid level Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Repair Disassemble and inspect the Valve Body per service information and repair or replace as necessary If there are no problems found in the Valve Body replace the Transmission Solenoid Pressure Switch Assembly per the Service Information Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the used B circuit and Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit in the Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes gt GoTo 9 No Repair the Transmission Control Relay Output circuit for an o
198. re if the SSV is in the TCC position If the L R pressure switch indicates pressure while in PEMCC or FEMCC EMCC operation is aborted and inhibited to avoid inadvertent application of the L R clutch Partial will be attempted if GENERAL INFORMATION the L R pressure switch does not indicate pressure A second detection of L R pressure results in setting the code Transmission Effects At speeds above 72 Km h 45 MPH EMCC is inhibited Once speed falls below 72 Km h 45 MPH the transmission will go into relay open limp in mode and the MIL will illuminate Possible causes gt Valve body Solenoid valve stuck in L R position gt Intermittent short to ground or open circuit in L R Pressure Switch Sense circuit with code 24 only gt Solenoid pack with code P 1784 24 only gt TCM with code P 1784 24 only Name of Code P1793 48 Torque Reduction TRD Link Communication Error Note The MIL may set on some engines 3 3L 3 8L 3 5L When Monitored Whenever the engine is run ning Set condition This code is set when the TCM sends multiple torque reduction messages to the PCM andthe TCM does not receive a response from the PCM Theory of Operation During high torque shifts the TCM will send a message requesting that the PCM reduce engine power until the shift is com pleted This message is sent from the TCM to the Powertrain Control Module across the Torque M an agement Request Sense Circuit
199. repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the OD Pressure Switch Sense circuit in the TCM harness connector 15 the voltage above 0 5 volt Yes Repair the OD Pressure Switch Sense circuit for a short to voltage Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 If there are no possible causes remaining view repair Repair Replace the WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 87 TRANSMISSION P1765 SWITCHED BATTERY Continued ACTION APPLICABILITY The conditions necessary to set this DTC are not present at this time All Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 88 TRANSMISSION Symptom P1767 TRANSMI SSION RELAY ALWAYS ON When Monitored and Set Condition P1767 TRANSMISSION RELAY ALWAYS ON When Monitored When ignition key is turned from the OF F position tothe RUN position and or ignition is turned from the CRANK position to RUN position Set Conditi
200. ring a rebuild with code P0740 38 present gt Solenoid pack Name of code P0750 41 L R Solenoid Circuit P0755 42 2 4 Solenoid Circuit P0760 43 OD Solenoid Circuit 765 44 UD Solenoid Circuit When monitored key is turned from off position to run position and or ignition key is turned from crank position to run position then every 10 seconds thereafter or when a speed ratio or pressure switch error DTC is detected Set condition four solenoids are tested for continuity continuously immediately upon start up and during vehicle operation For solenoids that are currently energized power is momentarily inter rupted then reenergized For solenoids that are not currently energized the solenoid is momentarily energized then deenergized Under both situations if an inductive spike is not sensed by the Transmis sion Control Module TCM during the continuity check it is retested twice If it fails the test the third time the appropriate code is set GENERAL INFORMATION Gear UD OD Rev 2 4 L R Park X Reverse X X Neutral X 15 X X 2nd X X 3rd X X 4th X X Theory of operation Four solenoids are used to control the friction elements clutches The conti nuity of the solenoids circuits are periodically tested Each solenoid is turned on or off depending on it s current state An inductive spike should be detected by the TCM during this test If no spike is detected the
201. rm 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the Transmission Solenoid Pressure Switch harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Using a 12 volt test light connected to ground check the Transmission Control Relay Output circuit in the Solenoid Pressure Switch Assembly harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes gt 9 No Repair the Transmission Control Relay Output circuit for an open or high resistance If the fuse is open make sure to check for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Disassemble and inspect the Valve Body per service instructions 116 TRANSMISSION P1787 OD HYDRAULIC PRESSURE TEST FAILURE Continued ACTION APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measurethe resistance between
202. roblem If the transmission is to be repaired check all of the components related to the Underdrive and Overdrive clutches nspect the pump per service information and repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 56 TRANSMISSION Symptom PO734 GEAR RATIO ERROR IN 4TH EIL When Monitored and Set Condition PO734 GEAR RATIO ERROR IN 4TH When Monitored The Transmission Gear Ratio is monitored continuously while the Transmission is in Gear Set Condition If the ratio of the input RPM to the output RPM does not match the current Gear Ratio POSSIBLE CAUSES RELATED DTC S PRESENT RELATED PRESSURE SWITCH DTC S PRESENT INTERMITTENT GEAR RATIO ERRORS TRANSMISSION INTERNAL ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTC s Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII9 read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does n
203. rom being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 Ignition on engine not running With the DRBIII9 monitor the Trans Temp Volts On the Transmission Simulator place the Thermistor Voltage Selector Switch to all three positions Compare the DRBIII9 reading with the numbers on the Transmis sion Simulator Pick one that best matches your readings DRBIII readings always high GoTo 4 DRBIII9 readings simulator 0 25 V GoTo 9 readings always low GoTo 10 DRBIII readings erratic GoTo 12 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the TRS harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Speed Sensor Ground circuit from the TCM harness connector to the TRS harness connector 15 the resistance above 5 0 ohms Yes Repair the Speed Sensor Ground circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 5 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the TRS harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Transmission Temperature Sensor Signal circuit from the TCM harness connector to the TRS harness connector Is the resistance above 5 0 ohms Yes Repair the Transmission Temperature Sensor Si
204. running Using a 12 volt test light connected to ground check the Brake Shift nterlock F eed circuit in the Brake Shift Interlock harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes GoTo 4 GoTo 5 If there are no possible causes remaining view repair Repair Replacethe Brake Shift nterlock Solenoid in accordance with the Service Information 146 TRANSMISSION BRAKE SHIFT INTERLOCK OUTPUT OPEN Continued APPLICABILITY Turn the ignition off to the lock position Disconnect the Front Control Module harness connector Disconnect the Brake Shift Interlock harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Brake Shift Interlock Feed Circuit from the Front Control Module connector to the Brake Shift Interlock harness connector Is the resistance above 5 0 ohms Yes Repair the Brake Shift Interlock Feed Circuit for an open GoTo 7 Turn the ignition off to the lock position Disconnect the Front Control Module harness connector Disconnect the Brake Shift Interlock harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Brake Shift Interlock Control Circuit from the Front Control Module connector to the Brake Shift Interlock harness connector 15 the resis
205. s incorrect depress the E nter key and then select the correct size Depress the Page Back key to exit the reset procedure Notes About Electronic Pinion Factor Features Thenature of the electronic pinion factor requires that certain features must be taken into consideration gt f no pinion factor is stored an installed TCM the vehide speedometer will not operate engine speed will be limited to 2300 RPM and catalyst damage may gt Selecting a wrong tire size will cause the speed ometer to be inaccurate and will also cause any speed related features to operate improperly Note After replacing the TCM you must reprogram pinion factor 3 GENERAL INFORMATION 3 4 USING THE DRBIII Refer to the DRBIII9 users guide for instructions and assistance with reading trouble codes erasing trouble codes and other DRBII functions 3 5 DRBIII ERROR MESSAGES Under normal operation the DRBIII9 will dis play one of only two error messages User Requested WARM Boot User Requested COLD Boot If the DRBIII9 should display any other error message record the entire display and call the S T A R Center This is a sample of such an error message display ver 2 14 date 26 J ul93 file key itf cc date ul 26 1993 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 D
206. se circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 8 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the 2 4 Pressure Switch Sense circuit Is the resistance below 5 0 ohms Yes Repairthe 2 4 Pressure Switch Sense circuit for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 9 Ignition on engine not running Measure the voltage of the 2 4 Pressure Switch Sense circuit in the TCM harness connector 15 the voltage above 0 5 volt Yes Repair 2 4 Pressure Switch Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 10 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock posit
207. sense circuit open or shorted to ground between TCM and solenoid pack gt OD pressure switch sense circuit shorted to bat tery gt Solenoid pack gt Loose valve body bolts gt Plugged filter internal transmission or torque converter failure gt TCM Name of code P1782 22 2 4 Pressure Switch Sense Circuit When monitored Whenever the engine is run ning Set condition This code 15 set if the 2 4 pressure switch is open or closed at the wrong time a given gear see chart below Theory of operation The Transmission system uses three pressure switches to monitor the fluid pressure in the L R 2 4 and OD elements The pressure switches are continuously monitored for the correct states in each gear as shown below GENERAL INFORMATION Normal Pressure Switch States Ger LR 24 R OP OP OP N 1st CL OP OP 2nd OP CL OP 3rd OP OP CL Ath OP CL CL OP switch is open CL switch is closed Transmission Effects f the 2 4 pressure switch is identified as closed in P or N the code will imme diately be set and normal operation will be allowed for that given key start If the problem is identified for 3 successive key starts the transmission will go into relay open limp in mode If the 2 4 pressure switch is identified as being closed in 1st or 3rd gear and was not identified as being closed in P or N then 2nd gear or 4th gear will be substituted for 1st or 3rd gear depending on throttl
208. shift schedule the TCM is to use See Trans mission Operation and Shift Scheduling at Various Sump Temperatures in this diagnostic manual If the Temperature Sensor circuit fails to operate properly the TCM will use the calculated oil tem perature routine found in prior model year TCM If this occurs for three consecuti ve key starts the code will be set The TCM will then test the Temperature Sensor circuit after every 35 OBDII EURO STAGE OBD warm up starts If the Temperature Sen sor circuit is OK the Temperature Sensor data is used in place of the Calculated Oil Temperature data Transmission Effects f the Temperature Sensor indicates a temperature below 18C 0 F or above 115C 240 F at start up The TCM compares the calculated oil temperature to the indicated Temper ature Sensor oil temperature If the calculated oil temperature differs significantly from the Temper ature Sensor value the calculated oil temperature will be used for that key start GENERAL INFORMATION Possible Causes gt Wiring or Connector problems in the transmis sion temperature sensor signal circuit gt 5 gt Name of Code P1738 75 High Temperature Operation Activated When Monitored Whenever the engine is running Set Condition Immediately once the Overheat Shift Schedule is activated Theory of Operation f the transmission oil tem perature rises above 115C 240 F the overheat shift schedule is activa
209. sion Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the 2 4 Pressure Switch Sense circuit in the TCM harness connector 15 the voltage above 0 5 volt Yes Repair the 2 4 Pressure Switch Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 12 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 121 TRANSMISSION Symptom P1789 2 4 OD HYDRAULIC PRESSURE TEST FAILURE When Monitored and Set Condition 1789 2 4 00 HYDRAULIC PRESSURE TEST FAILURE When Monitored In any forward gear with engine speed above 1000 RPM shortly after a shift and every m
210. sor harness connector Is the resistance above 5 0 ohms Yes Repair the Speed Sensor Ground circuit for an open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 7 43 TRANSMISSION PO720 OUTPUT SPEED SENSOR ERROR Continued APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Output Speed Sensor harness connector Note Check connectors Clean repair as necessary Measurethe resistance between ground and the Output Speed Sensor Signal circuit Is the resistance Below 5 0 ohms Yes Repair the Output Speed Sensor Signal circuit for a short to ground Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 8 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused B and Transmission Control Relay Output circuits in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the Output Speed Sensor Signal circuit in the harness connector 15 the voltage above 0 5 volts Yes Repair the Output Speed Sensor Signal circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 9 T
211. ssary and adjust the Transmission Fluid Level in accordance with the Service Infor mation Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Perform Cooler Flow Check per Service Information Did the cooler flow test pass Yes gt GoTo 4 No Repair cause of plugged Transmission Oil Cooler Flush or replace Transmission Oil Cooler s as necessary per Service I nformation Perform 41 TRANSMISSION VERIFICATION TEST VER 1 83 TRANSMISSION 1738 TEMPERATURE OPERATION ACTIVATED Continued APPLICABILITY This DTC isan informational DTC designed to aid the Technician in diagnosing shift quality complaints This DTC indicates that the Transmission has been operating in the Overheat shift schedule which may generate a customer complaint The customer driving patterns may indicatethe need for an additional Transmission Oil Cooler Were any problems found Yes Repair cause of transmission overheating or if indicated install an additional Transmission Oil Cooler Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Test Complete 84 TRANSMISSION Symptom P1739 POWER UP AT SPEED When Monitored and Set Condition P1739 POWER UP AT SPEED When Monitored When TCM Transmission Control Module initially powers up Set Condition If the TCM powers up and senses a valid forward gear PRNDL DTC and the Output RPM is above 800 RPM approximately 32 Km h or 20 MPH then the
212. sure the resistance between ground and the L R Solenoid Control circuit Is the resistance below 5 0 ohms Yes Repair the L R Solenoid Control circuit for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 9 No GoTo 10 If there are no possible causes remaining view repair Repair Replace the Transmission Control Module WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FAC TOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No Test Complete Turn the ignition off to the lock position Disconnect the harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the L R Solenoid Control circuit in the harness connector 15 the voltage above 0 5 volt Yes
213. t all times If the linkage is incorrectly adjusted the TCM may sense a shift lever position that is not correct for the gear range chosen by the driver This may cause diagnostic trouble codes to be set and a possible limp in situation The following complaints may also be the result of an incorrectly adjusted or worn linkage Delayed clutch engagement or erratic shifts Vehicle able to drive in Neutral Engine not able to crank in Park or Neutral Gearshift linkage able to be shifted without the key in the ignition Not able to remove the ignition key in Reverse Parking pawl not engaging The shift linkage should also be adjusted when replacing the transaxle repairing the valve body or repairing any component between the shift lever and the transaxle Some questions to ask yourself when considering the road test are listed below 15 the complaint or concern what you think it is based the driver s description of the probl em Is the transaxle operating normally is there real problem When does the malfunction occur 15 the problem in only one gear range What temperature does the complaint occur e 15 the transaxle in limp in mode 4 3 3 ELECTRONIC PINION FACTOR WARNINGS The pinion factor must be set for all new trans mission control modules If the pinion factor is not set or if it is set incorrectly any speedometer speed control rolling door locks and other devic
214. t and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the O D Pressure Switch Sense circuit in the TCM harness connector 15 the voltage above 0 5 volt Yes Repair the O D Pressure Switch Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 10 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 106 TRANSMISSION Symptom P1782 2 4 PRESSURE SWITCH SENSE CIRCUIT When Monitored and Set Condition P1782 2 4 PRESSURE SWITCH SENSE CIRCUIT When Monitored Whenever the engine is running Set Condition The appropriate DTC is set if one of the Pressure Switches are open or closed at the wrong time in a given gear POSSIBLE CAUSES TRANSMISSION RELAY DTC S PRESENT INTERMITTENT WIRING AND CONNECTORS TRANSMISSION RELAY OUTPUT CIRCUIT OPEN 2 4 PRESSURE SWITCH
215. t recent code Code 1 the Starts Since Set counter counts the number of times the vehicle has started since it was last set The counter will count up to 255 starts Notethat this code only applies to the last code set When there no diagnostic trouble codes stored in memory the DRBIII9 will display NO DTC S GENERAL INFORMATION PRESENT and the reset counter will STARTS SINCE CLEAR XXX The number of starts helps determine if the diagnostic trouble code is hard or intermittent fthecount is less than 3 the code is usually a hard code f the count is greater than 3 it is considered an intermittent code This means that the engine has been started most of the time without the code recurring 3 3 5 TROUBLE CODE ERASURE A Diagnostic trouble code will be cleared from TCM memory if it has not reset for 40 warm up show A warm up cyde is defined as sufficient vehide operation such that the coolant temperature has risen by at least 4 4 40 F from engine starting and reaches a minimum temperature of 71C 160 F The Malfunction Indicator Lamp MIL will turn off after 3 good trips or when the 5 are cleared from the TCM 3 3 6 LIST OF DIAGNOSTIC TROUBLE CODES Detailed descriptions follow list The may report any of the following cycles DTC P Code Name of Code Limp in MIL 11 P0700 Internal Yes Yes 12 P1792 Battery was disconnected No No 13 700 Internal
216. t the TRS harness connector Disconnect the TCM harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the TRS T41 Sense circuit at the TCM harness connector 15 the voltage above 0 5 volt Yes Repair the TRS T41 Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 18 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TRS harness connector Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistance of the TRS T42 Sense circuit from the TCM harness connector to the TRS harness connector 15 the resistance above 5 0 ohms Yes Repair the TRS T42 Sense circuit for an open Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 No GoTo 20 Turn the ignition off to the lock position Disconnect the TRS harness connector Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistanc
217. t this time Check the gearshift linkage adjustment Gear Ratio DTC s can be set by problems in the Input and Output Speed Sensor circuits If the vehicle passes the clutch test and still sets Gear Ratio DTC s check the Speed Sensors for proper operation NOTE Remove the starter relay before installing the Transmission Simu lator Check the speed sensor wiring and connectors for good connection then perform a wiggle test using the Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1 This DTC can also be set under extreme temperature conditions this is usually caused by an internal problem Ask the customer if the problem is only experienced under extreme hot or cold conditions Were there any problems found Yes Repair as necessary No Test Complete If there are no possible causes remaining view repair Repair Repair internal transmission problem If the transmission is to be repaired check all of the components related to the Reverse and L R dutches Inspect the pump per service information and repair as necessary 60 TRANSMISSION Symptom 740 CONVERTER CLUTCH CONTROL CIRCUIT When Monitored and Set Condition P0740 TORQUE CONVERTER CLUTCH CONTROL CIRCUIT When Monitored During Electronically Modulated Converter Clutch EM CC Operation Set Condition A Transmission must be in EMCC with input speed gt than 1750 RPM TCC L R sol achieves th
218. tance above 5 0 ohms Yes Repair the Brake Shift Interlock Control Circuit for an open No GoTo 7 If there are no possible causes remaining view repair Repair Replace the Front Control Module in accordance with the Service Information The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary No Test Complete 147 TRANSMISSION Symptom CHECKING PARK NEUTRAL SWITCH OPERATION POSSIBLE CAUSES P N POSITION SWITCH SENSE CIRCUIT OPEN P N POSITION SWITCH SENSE CIRCUIT SHORTED TO GROUND TRANSMISSION RANGE SENSOR PCM P N POSITION SWITCH TEST APPLICABILITY Turn the ignition on With the DRBIII read the Park Neutral Position Switch input state While moving the gear selector through all gear positions Park to 1 and back to Park watch the DRBIII9 display Did the DRBIII9 display show P N and D R in the correct gear positions Yes Test Complete 2 Turn the ignition off Disconnect the PCM harness connectors Disconnect the Transmission Range Sensor harness connector Note Check connectors Clean repair as necessary Measure the resistance of the P N Position Switch Sense circuit 15 the resistance below 5 0 ohms Yes gt GoTo 3
219. ted refer to Transmission Operation as a function of Transmission Oil Tem perature and the code is set The DTC is an infor mation code only and is being set to aid the techni dan in determining root cause of a customer driveability issue The codeis also intended to alert the technician to determine if a cooling system malfunction has occurred or if an additional trans mission air to oil cooler should be added to the vehicle if the customer regularly drives in a manner that overheats the transmission Extended opera tion above 115C 240 F will reduce the durability of the transmission and should be avoided Correcting the cooling system malfunction or installing an additional transmission oil cooler will improve transmission durability especially for customers who operate in city construction stop and go traffic tow trailers regularly drive aggressively in low gear or drive regularly in mountainous areas Transmission Effects nformation only code Overheat shift schedule was activated no limp in condition occurs 2nd gear partial EM CC above 40 Km h 25 MPH 3rd gear from 45 69 Km h 28 43 MPH delayed 3 4 upshift at 69 Km h 43 MPH early 4 3 coastdown at 66 Km h 41 MPH EMCC operation under all conditions above 40 Kmyh 25 MPH except at closed throttle or 1st gear Possible Causes Transmission Overfilled with Oil Engine cooling fan failure Engine thermostat stuck dosed Radiator corroded or packed wi
220. ter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Using the DRBIII9 perform the Shift Lever Position Test Select the test outcome from the following Test passes GoTo 3 Test fails with DTC GoTo 4 Test fails without DTC Adjust the shift linkage per the Service I nformation Perform 41 TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 32 TRANSMISSION 705 SHIFTER SIGNAL Continued ACTION APPLICABILITY Turn the ignition off to the lock position CAUTION Remove the Starter Relay from the IPM This will prevent the vehicle from being started in gear Install Transmission Simulator Miller tool 8333 and the FWD Adapter Cable kit Miller tool 8333 1
221. termittent does not last long enough to set the code the customer will say that the transmission violently hunts between gears The TCM will use a calcu lated throttle angle supplied by the PCM over the PCI bus IfthePCI bus is unavailable the TCM will use a default throttle angle of 24 degrees for the key start in which the code was set The TCM will try to use the TPS signal again on the next key start Possible causes gt Open or shorted TPS signal and or ground cir cuits gt connector problems gt TPS or TPS connector Check PCM gt PCM gt Name of code P 1787 31 OD Hydraulic Pressure Test Failure 1788 32 2 4 Hydraulic Pressure Test Failure 1789 33 OD 2 4 Hydraulic Pressure Test Failure When monitored n 1st 2nd or 3rd gear with engine speed above 1000 RPM shortly after a shift and every minute thereafter Set condition mmediately after a shift into 1st 2nd or 3rd gear with engine speed above 1000 RPM the TCM momentarily turns on element pressure to the 2 4 and or OD clutch circuits to identify that the appropriate pressure switch doses If the pressure switch does not dose it is tested again If the switch does not close the second time the appropriate code is set Theory of operation The Transmission Control Module TCM tests the OD and 2 4 pressure switches when they are off OD and 2 4 aretested in 1st gear OD in 2nd gear and 2 4 in 3rd gear The test verifies th
222. th dirt Transmission Oil Cooler Plugged Customer driving pattern requires additional transmission cooling Name Of Code P 1739 76 Power U p at Speed When Monitored When TCM transmission con trol module initially powers up Set Condition f the TCM powers up whilein the Drive position and the vehicle is going above 32 Kmyh 20 MPH the code is set Theory of Operation If a vehicle loses power to the TCM the vehicle will go to the 2nd gear mode GENERAL INFORMATION since there is no power available to control the transmission solenoids However if power is re stored the TCM will power up and normal opera tion will be restored This DTC identifies that power to the TCM was restored when the gear selector was in a Drive position while the vehide was moving at speeds above 32 Km h 20 MPH If a person shifts to Neutral and cycles the ignition key and quickly shifts to Drive while moving before the TCM comes out of its START ROUTINE the DTC can be set Therefore it is critical that this DTC diagnosis repair procedure should only be used if the vehicle is experiencing intermittent 2nd gear operation and subsequently a return to normal operation during normal driving Transmission Effects No limp in condition The DTC is for information only when trying to diagno sis intermittent 2nd gear operation and subse quently a return to normal operation Possible Causes NoProblem if vehicle is started in neu
223. th the DRBIII9 monitor the L R Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator Did the Pressure Switch state change from OPEN to CLOSED when the test button was pressed Yes gt GoTo 5 GoTo 7 Check the Transmission Fluid Level per the Service Information Is the Transmission Fluid Level at the proper level Yes 6 No Ifthe Transmission Fluid is low repair any Transmission Fluid leak as necessary and adjust the Transmission Fluid Level in accordance with the Service I nformation Perform 41 TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Inspect the Solenoid Switch Valve in the valve body per the Service Information and repair or replace as necessary If no problems are found in valve body replace the Transmission Solenoid Pressure Switch Assembly per service information Perform 41 TRANSMISSION VERIFICATION TEST VER 1 101 TRANSMISSION P1776 SOLENOID SWITCH VALVE LATCHED IN LR POSITION Continued APPLICABILITY Turn the ignition off to the lock position Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused B circuit and the Transmission Control Relay Output circuit in the Transmission Co
224. the Transmission Solenoid Pressure Switch harness connector Is the resistance below 5 0 ohms Yes Repair the L R Pressure Switch circuit for a short to ground Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 9 112 TRANSMISSION P1784 LR PRESSURE SWITCH SENSE CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused B circuit and the Transmission Control Relay Output circuit in the IPM Ignition on engine not running Measure the voltage of the L R Pressure Switch Sense drcuit in the TCM harness connector 15 the voltage above 0 5 volt Yes Repair the L R Pressure Switch Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 10 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were
225. there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 113 TRANSMISSION Symptom P1787 OD HYDRAULIC PRESSURE TEST FAILURE E When Monitored and Set Condition P1787 0D HYDRAULIC PRESSURE TEST FAILURE When Monitored In any forward gear with engine speed above 1000 RPM shortly after a shift and every minute thereafter Set Condition After a shift into a forward gear with engine speed gt 1000 RPM the TCM momentarily turns on element pressure to the dutch ckts that don t have pressure to identify the correct pressure sw closes If the pressure sw does not dose 2 times the code sets POSSIBLE CAUSES INCORRECT FLUID LEVEL LOSS OF PRIME DTC P1791 PRESENT RELATED DTC S PRESENT INTERMITTENT WIRING AND CONNECTORS TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN OD PRESSURE SWITCH SENSE CIRCUIT OPEN OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE INTERNAL TRANSMISSION TCM O D HYDRAULIC TEST FAILURE 114 TRANSMISSION P1787 OD HYDRAULIC PRESSURE TEST FAILURE Continued APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms Wit
226. tic 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 SCREEN WHILE MOTION DO NOT HANG THE DRBIII FROM THE REAR VIEW MIRROR OR OPERATE IT YOURSELF HAVE AN ASSISTANT AVAILABLE TO OPERATE THE DRBIII Road testingis an essential step in the diagnostic process that must not be overlooked Along with diagnostic information obtained from the 2 Scan Tool and the original customer concern the road test helps to verify the problem and observe operation under actual vehicle driving conditions J ust as important as the road test is there are preliminary inspections that should be carried out prior to the road test Always check the fluid level and condition before going on a road test or per forming other tests Also try to determine the type of fluid being used Improper fluid can result in problems Additionally a variety of complaints can be caused by incorrect fluid level Some of the conditions caused by incorrect fluid level are as follows Delayed engagement Poor shifting or erratic shifts Excessive noise Overheating The next step is to verify that the shift linkage is correctly adjusted If the gearshift linkage is incor 20 rectly adjusted because of wear or incorrect adjust ment a number of complaints can result TheTCM monitors the Shift Lever Position SL P Sensor a
227. tion Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 130 TRANSMISSION P1793 TRD LINK COMMUNICATION ERROR Continued APPLICABILITY With the DRBIII9 read Transmission Are any of the following DTCs P1716 P0731 P0732 P0733 P0734 P1736 present also Yes If any of these codes are present disregard the P1793 DTC and refer to the symptom list for the other DTCs Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 With the DRBIII9 Check the STARTS SINCE SET counter Note This counter only applies to the last DTC set Is the STARTS SINCE SET equal to 0 Yes gt GoTo 4 No GoTo 9 Turn the ignition off to the lock position Disconnect the PCM harness connector Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Torque Management Request Sense circuit from the TCM harness connector to the PCM harness connector Is the resistance above 5
228. tly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes GoTo 8 No Repair the Fused B circuit for an open or high resistance If the fuse is open make sure to check for a short to ground Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Note Check connectors Clean repair as necessary Ignition on engine not running Using a 12 volt test light connected to ground check both Transmission Control Relay Output circuits in the TCM harness connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes 9 No Repair the Transmission Control Relay Output circuit for an open or high resistance Perform 41 TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Replace the WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 77 TRANSMISSION P1714 LOW BATTERY VOLTAGE Continued APPLICABILITY The conditions necessary to set this DTC are not present at this time Using the schematics as guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts
229. to battery Name of code 740 38 Torque Converter Clutch Control Circuit When monitored During Electronically Modu lated Converter Clutch EMCC Set condition a The transmission must be in EMCC with the input speed greater than 1750 RPM The TCC L R solenoid must achieve it s maximum duty and still not be able to pull the engine speed within 60 RPM of input speed b If the transmission is in FEMCC and the engine can slip the TCC by more than 100 RPM Engine speed Input speed for 10 seconds The code will be set if one of these event happens threetimes at a throttle angleless than 30 degrees Theory of operation When in 2nd 3rd or 4th gear the torque converter dutch TCC can be locked when certain conditions are met The TCC piston is electronically modulated by increasing the duty cyde of the L R TCC solenoid until the torque converter slip difference difference between engine and turbine speed is within 60 RPM Then the L R TCC solenoid is fully energized FEM CC 100 duty cyde Torque converter slip is monitored in FEMCC to ensure adequate clutch capacity Transmission Effects EMCC will still be avail able after code is set MIL will illuminate after 5 minutes of accumulated slip in FEMCC The trans mission will attempt normal operation no limp in even after the MIL is illuminated Possible causes gt Worn pump bushing and or failed torque con verter both should be replaced du
230. tor Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector Ignition on engine not running Measure the voltage of the Input Speed Sensor Signal circuit in the TCM harness connector 15 the voltage above 0 5 volts Yes Repair the Input Speed Sensor Signal circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 9 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the TRS harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused B circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the Speed Sensor Ground circuit in the TCM harness connector 15 the voltage above 0 5 volts Yes Repair the Speed Sensor Ground circuit for a short to voltage Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 10 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 40 TRANSMISS
231. tors Clean repair as necessary Connect a jumper wire between the Fused B circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the 2 4 Pressure Switch Sense circuit in the TCM harness connector 15 the voltage above 0 5 volt Yes Repair the 2 4 Pressure Switch Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the L R Pressure Switch Sense drcuit in the TCM harness connector Is the voltage above 0 5 volt Yes Repair L R Pressure Switch Sense circuit for a short to voltage Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Transmission Solenoid Pressure Switch Assembly harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean
232. tral at speeds above 32 Km h 20 MPH and shifted quickly to Drive before comes out of the START ROUTINE FOR INTERMITTENT 2ND GEAR OPER ATION AND THEN A SUBSEQUENT RE TURN TO NORMAL OPERATION WITH OUT CYCLING THE IGNITION KEY Intermittent Direct Battery connection be tween TCM 60 way pin 56 and battery Intermittent Fused Ignition Switch Output between TCM 60 way pin 11 and ignition switch Intermittent Ground to TCM 60 way pins 53 and 57 Name of code P1717 77 No Communication with Mechanical Instrument Cluster MIC When monitored Continuously with key on Set condition no PCI bus messages are received from the Mechanical Instrument Cluster MIC for 25 seconds Theory of operation The TCM communicates with the MIC using the PCI bus It relies on certain information to function properly The TCM contin uously monitors the PCI bus to check for messages broadcast from the PCM Transmission Effects Possible improper TCM AutoStick configuration Possible causes gt Open or shorted PCI bus circuit from MIC gt MIC gt TCM If other communications codes are stored in the TCM only Name of code P0600 78 Serial Communication Link Malfunction When monitored Continuously with key on Set condition f no PCI bus messages are received by the Transmission Control Module TCM for 10 seconds Theory of operation The TCM communicates with the other modules in the veh
233. ts Yes GoTo 5 No Replace the Autostick OD OFF switch assembly Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition on Select the Autostick position with the gear selector With the DRBIII observe the Autostick switch voltage Push the Autostick down switch 15 the voltage between 0 3 1 6 volts Yes GoTo 4 No Replace the Autostick OD OFF switch assembly 136 TRANSMISSION P1796 AUTOSTICK SENSOR CIRCUIT Continued ACTION APPLICABILITY Turn the ignition on Select the Drive position with the gear selector With the DRBIII observe the Autostick switch voltage Push the O D OFF switch 15 the voltage between 2 8 3 8 volts Yes Test Complete No Replace the Autostick OD OFF switch assembly Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the Autostick OD switch harness connector NOTE Check connectors Clean repair as necessary Measure the resistance of the Autostick OD Off Mux Input circuit between the Autostick OD switch harness connector and the TCM harness connector 15 the resistance below 5 0 ohms Yes gt GoTo 7 No Repair the open Autostick OD Off Mux Input circuit Perform 41TE TRANSMISSION VERIFICATION TEST VER 1 harness connector and ground Is the resistance below 5 0 ohms Yes 8 No Repair the open Autostick
234. ts may result in personal injury and or im proper system operation Only those components with approved repair and installation procedures in the service instructions should be serviced 19 GENERAL INFORMATION 4 2 4 DRBIII SAFETY INSTRUCTIONS WARNING EXCEEDING THE LIMITS OF THE DRB 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 speci fications at all times Do not use the if it has been damaged Do not use the test leads if the insulation is damaged or if metal is exposed To avoid electrical shock do not touch the test leads tips or the circuit being tested Choose the proper range and function for the measurement Do not try voltage or current mea surements that may exceed the rated capacity Donot exceed the limits shown in the table FUNCTION INPUT LIMIT Volts 0 500 peak volts AC 0 500 volts DC Ohms resistance 0 1 12 megohms Temperature Frequency Measured 0 10 kHz Frequency Generated 58 1100 F 50 600 C 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 peak AC Use caution when measuring voltage above 25v DC or 25v AC The dircuit being tested must be protected by a 10A f
235. up If the vehicle has any indications of a bus problem the bus must be repaired first Were any problems found Yes Repair wiring and or connector as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 155 TRANSMISSION Symptom TRANSMISSION SIMULATOR 8333 WILL NOT POWER UP APPLICABILITY NOTE If the Transmission Simulator Miller tool 8333 will not power up this is a symptom of the Transmission Relay being open such as Limp in and or this also could be a indication of the Transmission Simulator not installed correctly on the vehicle NOTE Check the Simulator ground cable connection NOTE Check all Transmission Simulator harness connections Repair these symptoms before having the Transmission Simulator Miller Tool 78333 repaired Continue Test Complete 156 VERIFICATION TESTS Verification Tests 41TE TRANSMISSION VERIFICATION TEST VER 1 APPLICABILITY 1 Connect the to the Data Link Connector DLC All 2 Reconnect any disconnected components 3 With the DRBIII9 erase all Transmission also erase the PCM DTC s NOTE Erase P0700 the PCM to turn the Malfunction Indicator Lamp MIL off after making Transmission repairs 5 With the DRBIII display Transmission Temperature Start and run the engine until the Transmission Temperature is HOT above 43 33 C or 110 F 6 Check the Transmission Fluid and
236. urn the ignition off to the lock position Disconnect the TCM harness connector Disconnect the TRS harness connector Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Connect a jumper wire between the Fused B and Transmission Control Relay Output circuits in the Transmission Control Relay connector in the IPM Ignition on engine not running Measure the voltage of the Speed Sensor Ground circuit in the TCM harness connector 15 the voltage above 0 5 volts Yes Repair the Speed Sensor Ground circuit for a short to voltage Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No GoTo 10 If there are no possible causes remaining view repair Repair Replace the TCM WITH THE DRBIII PERFORM QUICK LEARN AND REPROGRAM PINION FACTOR Perform 41 TRANSMISSION VERIFICATION TEST VER 1 44 TRANSMISSION 720 SPEED SENSOR ERROR Continued ACTION APPLICABILITY The conditions necessary to set this DTC are not present at this time All Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wiring while checking for shorts and open circuits Were there any problems found Yes Repair as necessary Perform 41 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 45 TRANSMISSION Symptom P0725 E NGINE SPEED SENSOR CIRCUIT 3 3L 3 8L When Monitored and Set
237. use or circuit breaker Usethelow current shunt to measure circuits up to 10A Use the high current damp to measure circuits exceeds 10A When testing for the presence of voltage or rent make sure the meter is functioning cor rectly Take a reading of a known voltage or current before attempting 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 When using the meter function keep the DRB away from spark plug or coil wires to avoid measuring error from outside interference GENERAL INFORMATION 4 3 WARNINGS 4 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 any control module use the terminal side not the wire end of the connector Do not probe a wire through the insulation this will damageit 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 can damage fuses or components Also a second code could be set making diagnosis of the original problem more difficult 4 3 2 ROAD TEST 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 diagnos
238. ve body solenoid switch valve stuck in LU position May be accompanied by a code P1775 37 gt Loose valve body bolts gt Plugged filter internal transmission or torque converter failure gt Name of code P0705 28 Check Shifter Signal When Monitored Continuously with the key on Set Condition 3 occurrences in one key start of an invalid PRNDL code which lasts for more than 0 1 second Theory of Operation The through C4 T1 T41 42 sense circuits communicate the shift lever position to the TCM Each circuit is termi nated at the transmission with a switch Each switch can be either open or dosed depending on the shift lever position The TCM can decode this information and determine the shift lever position Each shift lever position has a certain combination of switches which will be open and closed this is called a PRNDL code There are 4 switches there fore there are many possible combinations of open and closed switches codes owever there are only 9 valid codes 8 for Autostick one for each gear position and three recognized between gear codes The remainder of the codes should never occur these are called invalid codes The following chart shows the normal switch states for each shift lever position TRS Park T1 Rev T2 N T2 OD T3 3 AS T3 L T1 C4 OP OP CL CL CL CL CL OP CL CL T3 C3 CL CL CL CL T41 C1 CL C
239. vel of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for applicable TSB s related to the symptom Perform this procedure prior to Symptom diagnosis Continue GoTo 2 92 TRANSMISSION P1768 RELAY OUTPUT ALWAYS OFF continued APPLICABILITY With the DRBIII9 Check the STARTS SINCE SET counter Note This counter only applies to the last DTC set Is the STARTS SINCE SET counter set at 0 Yes gt GoTo 3 No GoTo 10 Turn the ignition off to the lock position Remove the Transmission Control Relay from the IPM Note Check connectors Clean repair as necessary Ignition on engine not running Using a 12 volt test light connected to ground check the Fused B circuit in the Transmission Control Relay connector NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes gt GoTo 4 No Repair the Fused B circuit for an open If the fuse is open make sure to check for a short to ground Perform 41 TRANSMISSION VERIFICATION TEST VER 1 the Transmission Control Relay connector and the TCM harness connector Is the resistance above 5 0 ohms Yes Repair the Transmission Control Relay Control circuit for an open Perform 41 TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 Turn the ignition off to the lock pos
240. will resume If three gear ratio problems are iden tified in a given key start the transmission will go into relay open limp in mode Possible causes Code P0736 50 Excludes geartrain failures which should be obvious upon disassembly gt f code P1791 35 is also set follow diagnostic procedure for code P 1791 35 first gt Valve body 1 ball check or LR switch valve sticking may also set code 0731 51 gt Speed sensor or associated wiring may also set codes P0731 51 715 56 or P0720 57 gt Failed or slipping LR dutch may also set code P0731 51 gt LR seal leakage Intermittent no drive or re verse gt Sticky LR accumulator seals Intermittent no drive or reverse gt Failed reverse clutch hard code OD Rev lip seal leakage Worn reaction shaft support seal rings Snapring out of position Code P0731 51 Excludes geartrain failures which should be obvious upon disassembly gt f code P1791 35 is also set follow diagnostic procedure for code P 1791 35 first gt Valve body 1 ball check or LR switch valve sticking may also set code P0736 56 or have no Reverse gt Speed sensor or associated wiring may also set codes P 0736 50 P0715 56 or 720 57 GENERAL INFORMATION gt Failed or intermittent slipping UD clutch may also set P0732 52 or P0733 53 UD seal leakage intermittent Worn input clutch hub bushing hard code at heavy throttle Stic
241. witch s that should be closed are open a loss of prime test begins Available elements are turned on by the TCM to see if pump prime exists The code sets if no pressure switches respond POSSIBLE CAUSES PLUGGED TRANSMISSION OIL FILTER SHIFT LEVER POSITION TRANSMISSION FLUID LEVEL INTERMITTENT WIRING AND CONNECTORS TRANSMISSION OIL PUMP ACTION APPLICABILITY NOTE Low fluid level can be the cause of many Transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTC s Check and repair all engine prior to performing Transmission Symptom Diagnostics With the DRBIII read Transmission DTC s Record all DTC s and 1 Trip Failures NOTE Diagnose 1 Trip Failures as a fully matured DTC Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Perform the Shift Lever Position Test If the test does not pass refer to Symptom test for P0705 Check Shifter Signal For Gear Ratio DTC s check and record all CVI s Most DTC s set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run NOTE Verify flash level of Transmission Control Module Some problems are corrected by software upgrades to the Transmission Control Module NOTE Check for a
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