Home

ENGINE CONTROL SYSTEM SECTION EC CONTENTS

1. Cont d TERMINAL WIRE NO COLOR ITEM CONDITION DATA Engine is running Ignition switch OFF 0 1V Engine control module L citer turning ignition 4 WG switch OFF Self shutoff Ignition switch OFF BATTERY VOLTAGE Following a few seconds delay after turn 11 14V ing ignition switch OFF and thereafter i Engine is running 6 B Engine control module Engine ground ground Idle speed 7 G B Approximately 14 Data link connector for Engine is running Approximately 3 5V 15 CONSULT II Idle speed DATA MONITOR screen Approximately 3 5V 23 G R Approximately 3 5V Engine is running BATTERY VOLTAGE 9 L_ Cooling fan is not operating 11 14V LG R Cooling fan relay 10 Engine is running Approximately OV L Cooling fan is operating Engine is running L Both A C switch and blower fan switch are Approximately OV 11 L W Air conditioner relay ON Engine is running BATTERY VOLTAGE L switch is OFF Engine is running 13 B Engine control module Engine ground ground L_ Idle speed Engine is running Warm up condition 1 2 1 8V Idle speed 16 Y Mass air flow sensor Engine is running Warm up condition 1 7 2 3 L Engine speed is 2 000 rpm Approximately 0 4 8V Engine coolant tem Output voltage varies 1
2. Fuel pump relay 1 Reconnect fuel pump relay fuel pump harness connector and ECM harness connector 2 Turn ignition switch to ON position 3 Turn fuel pump relay to ON position and OFF position in ACTIVE TEST mode with CONSULT II and check operat ing sound OR 24 Refer to COMPONENT INSPEC 43 TION below MONITOR CMPS RPM REF 775rpm Replace fuel pump relay 2 1 Fuel pump Refer to COMPONENT INSPECTION below Replace fuel pump OK Disconnect and reconnect harness connec tors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness connector Reconnect ECM harness connector and retest INSPECTION END COMPONENT INSPECTION Fuel pump relay _ o Check continuity between fuel pump relay terminals and 5 Conditions Continuity 12V direct current supply gt lt between terminals 1 2 is No current supply No If NG replace relay YEC344 DISCONNECT usc Fuel pump 5 1 Disconnect fuel pump harness connector b 2 Check resistance between terminals 1 and 2 Resistance 0 2 5 00 at 25 C 77 If NG replace fuel pump I V7
3. 22 Fuel Pressure Regulator Check 23 Injector Removal and Installation 23 Idle Speed Ignition Timing Idle Mixture Ratio 24 ON BOARD DIAGNOSTIC SYSTEM DESGBIPTION 22 2 32 Malfunction Indicator 32 hirn aE 36 Generic Scan Tool 43 TROUBLE DIAGNOSIS General Description 46 46 WOYK FIOW Em 47 Description for Work Flow 48 Diagnostic 49 Diagnostic Trouble Code DTC Chart 50 Fail Safe 52 Basic snn a 53 Fast Idle FIC Inspection and PAUSO pate Leo die Les 55 Symptom Matrix 56 CONSULT II Reference Value in Data Monitor 58 Major Sensor Reference Graph Data Monitor 60 ECM Terminals and Reference Value 62 TROUBLE DIAGNOSIS FOR POWER SUPPLY 69 Main Power Supply and Ground Circuit 69 TROUBLE DIAGNOSIS FOR DTC 11 73 Camshaft Position Sensor CMPS
4. 0 11911011 12 13 14 15 16 8 91011 12 13 14 YEC302 EC GA 132 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS DATA MONITOR MONITOR CMPS RPM REF 0 RPM M R F C MNT LEAN AE 17 35 G OR Neutral Position Switch Cont d When the gear position is in neutral position neutral position switch is ECM detects the position because the continu ity of the line the ON signal exists DIAGNOSTIC PROCEDURE INSPECTION START CHECK OVERALL FUNCTION INSPECTION END 1 Turn ignition switch to ON posi tion 2 Select P N POSI SW in DATA MONITOR mode with CONSULT II Check P N POSI SW sig nal under the following con ditions Neutral position ON Except neutral position OFF OR Check voltage between ECM terminal 8 and ground under the following condi tions Voltage Neutral position Approximately 0V Except neutral position Approximately 5V EC GA 133 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Neutral Position Switch Cont d AEO AD Neutral position switch CHECK GROUND CIRCUIT NG Repair harness or con 1 Turn ignition switch to LOCK posi nectors tion 2 Disconnect neutral position switch harness connector 3 Check harness continuity between AEC750 neutral position switch connector term
5. 10 MEC735B Heated Oxygen Sensor HO2S Cont d DIAGNOSTIC PROCEDURE INSPECTION START CHECK OXYGEN SENSOR CIRCUIT 1 Start engine and warm it up sufficiently 2 Make sure that F C MNT in DATA MONITOR mode indi cates RICH and LEAN peri odically more than 5 times during 10 seconds at 2 000 rpm OR Stop engine and set ECM Diag nostic Test Mode II Heated oxy gen sensor monitor 3 Restart engine and run it at about 2 000 rpm for about 2 min utes under no load 4 Keep engine speed at 2 000 and make sure that the malfunc tion indicator on the instrument panel goes on and off more than 5 times during 10 seconds CHECK INPUT SIGNAL CIRCUIT 1 Stop engine 2 Disconnect ECM harness connector and heated oxygen sensor harness connec tor 3 Check harness continuity between ECM connector terminal and heated oxy gen sensor connector terminal 2 Continuity should exist 4 Check harness continuity between ECM connector terminal or heated oxygen sensor connector terminal 2 and engine ground Continuity should not exist If OK check harness for short circuit 9 107 INSPECTION END Repair harness or connec tors TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Heated Oxygen Sensor HO2S Cont d ECM 102 101 SEF79
6. BRB OON ooo o If NG replace engine coolant temperature sensor Acceptable Resistance KQ os i ____ 1 20 0 20 40 60 80 100 4 32 68 104 140 176 212 SEF012P EC GA 84 TROUBLE DIAGNOSIS FOR DTC 21 5 SNIN K Ignition coil amp power transistor harness connector NEF379 Ignition Signal COMPONENT DESCRIPTION Ignition coil amp power transistor Built into distributor The ignition coil is built into the distributor The ignition signal from the ECM is sent to the power transistor The power transis tor switches the ignition coil primary circuit on and off As the primary circuit is turned on and off the required high voltage is induced in the coil of the secondary circuit Diagnostic Check Items Trouble Malfunction is detected when 2 Possible Cause Code No 21 e The ignition signal in the primary circuit is not e Harness or connectors entered to ECM during engine cranking or running The ignition primary circuit is open or shorted e Power transistor unit e Resistor e Camshaft position sensor e Camshaft position sensor circuit DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE Note If both DTC 11 and 21 are displayed perform TROUBLE DIAGNOSIS FOR DTC 11 first Refer to EC GA 73 1 ignition switch to ON position 2 Select DATA MONITOR mode with CONSULT II 3 Start
7. SEF470Q OK Disconnect and reconnect harness connec tors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness connector Reconnect ECM harness connector and retest INSPECTION END EC GA 87 TROUBLE DIAGNOSIS FOR DTC 21 Ignition Signal Cont d SNR CHECK INPUT SIGNAL CIRCUIT 1 Stop engine 2 Disconnect ignition coil harness connec tor 3 Strip tape covering resistor and discon nect the resistor connector 4 Disconnect ECM harness connector 5 Check harness continuity between igni tion coil connector terminal and resistor terminal 7 resistor connector terminal and ECM connector terminal Repair harness or connec tors NEF380 DISCONNECT DISCONNECT Continuity should exist If OK check harness for short circuit 2 O CONNECTOR F24 Fi F101 Resistor CHECK COMPONENTS Replace resistor connector Resistor Refer to COMPONENT INSPECTION on next page OK DISCONNECT DISCONNECT p A Disconnect and reconnect harness connec tors in the circuit Then retest Y PU 1 Trouble is not fixed Ignition coil connector Check ECM pin terminals for damage or the connection of ECM harness
8. 2 2 Check continuity between relay terminals 12V 0 25 applied Continuity 3 5 exists No voltage applied No continuity Replace engine control module relay OK NG CHECK GROUND CIRCUIT 1 Turn ignition switch to LOCK position Repair harness or connec tors 2 Loosen and retighten engine ground Screws 3 Disconnect ECM harness connector 4 Check harness continuity betveen ECM connector terminals 6 3 9 8 108 and engine ground Continuity should exist If OK check harness for short circuit Check ECM pin terminals for damage or the connection of ECM harness connector INSPECTION END EC GA 72 TROUBLE DIAGNOSIS FOR DTC 11 Sealed cover Camshaft Position Sensor CMPS The camshaft position sensor is a basic component of the engine control module It monitors engine speed and piston position These input signals to the ECM are used to control fuel injection ignition timing and other functions The camshaft position sensor has a rotor plate and a wave forming circuit The rotor plate has 4 slits for a 180 REF sig nal The wave forming circuit consists of Light emitting Diodes LED and photodiodes Rotor plate The rotor plate is positioned between the LED and the photo diode The LED transmits light to the photodiode the rotor plate turns the slits cut the light to generate rough shaped pulses These pul
9. IN we ltt SOD O SEF203Q EC GA 116 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS SYSTEM DESCRIPTION Idle Air Control Valve IACV Auxiliary Air Control AAC Valve Camshaft position sensor Engine speed Mass air flow sensor Amount of intake air Engine coolant temperature sensor Engine coolant temperature ooo Ignition switch Throttle position sensor Neutral position switch Start signal gt Throttle position gt Neutral position ECM Air conditioner switch Engine Air conditioner operation control IACV AAC valve gt module Power steering oil pressure switch Power steering load signal Battery Vehicle speed sensor Cooling fan relay Load switch Blower fan switch gt Battery voltage gt Vehicle speed gt Cooling fan operation gt Electrical load gt Blower fan operation gt Rear window defogger switch and headlamp switch This system automatically controls engine idle speed to a specified level Idle speed is controlled through fine adjustment of the amount of air which bypasses the throttle valve via IACV AAC valve The IACV AAC valve repeats ON OFF operation according to the signal sent from the ECM The camshaft position sensor detects the actual engine speed and sends a signal to the ECM The ECM
10. Throttle Position Sensor Cont d OVERALL FUNCTION CHECK Use this procedure to check the overall function of the throttle position sensor circuit During this check a DTC might not be confirmed 1 Turn ignition switch to ON position 2 Select THRTL POS SEN in DATA MONITOR SELECTION FROM MENU mode with CONSULT II 3 Change display mode to Line graph display 4 Press START 5 Monitor the display whilst the accelerator pedal is depressed 6 Check the following e The voltage when accelerator pedal is fully released is approximately 0 35 0 65V e The voltage rise is linear in response to accelerator pedal depression e The voltage when accelerator pedal is fully depressed is approximately 4V OR 50 1 Turn ignition switch to ON position 45 2 Check the voltage between ECM connector terminals and i ground and check the following e The voltage when accelerator pedal is fully released is approximately 0 35 0 65V e The voltage rise is linear in response to accelerator pedal depression e The voltage when accelerator pedal is fully depressed is approximately 4V EC GA 91 TROUBLE DIAGNOSIS FOR DTC 43 Throttle Position Sensor Cont d EC TPS 01 THROTTLE POSITION SENSOR Detectable line for DTC m Non detectable line for DTC CONNECTOR 1 JOINT 5 i De GY BR YEC322 EC GA 92 TROUBLE DIAGNOSIS FOR DTC 43 Throttle Position Sensor
11. mes R d To compressor Refer to HA A C LG gt To A C control panel EU Refer to HA A C F70 DUAL PRESSURE SWITCH E21 UR 11 iacv rico SOLENOID VALVE 5 J if Lis T REFER TO THE FOLLOWING FUSE BLOCK Junction Box J B E104 FUSE BLOCK Junction Box J B NZ Ww B LN CERES CEOS 6171818 av YEC299 EC GA 121 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS lt gt IACV FICD solenoid valve harness connector UM e ES B ji pu DISCONNECT x HE QE IACV FICD solenoid valve a L R oo YEC339 IACV FICD Solenoid Valve Cont d COMPONENT DESCRIPTION When the air conditioner is on the IACV FICD solenoid valve supplies additional air to adjust to the increased load Check if air conditioner compressor functions normally CHECK OVERALL FUNCTION 1 Start engine and warm it up suffi ciently 2 Check idle speed Models with daytime light sys tem 800 50 rpm Models without daytime light sys tem 700450 rpm If NG adjust idle speed 3 Turn air conditioner switch and blower fan switch to ON position 4 Recheck idle speed 900 rpm or more INSPECTION END Refer to TROUBLE DIAGNOSES section CHECK POWER SUPPLY NG 1 Turn air conditioner switch to OFF po
12. Dectable line for DTC m Non detectable line for DTC L LG R Y F103 Tur COMBINATION VEHICLE METER SPEED SPEEDOMETER SENSOR F25 OR W B LY 1 OR W 5 11 8 aa M50 F104 OR W 0 41 N lt lt if Ls REFER TO THE FOLLOWING FUSE BLOCK Junction Box J B YEC292 EC GA 95 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Vehicle Speed Sensor VSS Cont d The vehicle speed sensor is installed in the transaxle It contains a pulse generator which provides a vehicle speed signal to the speedometer The speedometer then sends a signal to the ECM Vehicle speed sensor AEC110 DIAGNOSTIC PROCEDURE INSPECTION START MONITOR NO DTC VEHICLE SPEED CHECK OVERALL FUNCTION 1 Jack up drive wheels 2 Read VHCL SPEED SE signal in DATA MONITOR mode with CONSULT II CONSULT II value should be the same as the speedometer polly indication Q on 24 2 Turn ignition switch to SR 32 3 Rotate drive wheel by hand 4 Check voltage between ECM connector terminal 2 and body ground Voltage should vary between approx 0 4 2V YEC332 i NG CHECK SPEEDOMETER FUNCTION Make sure that speedometer functions properly P N POSI SW OFF INSPECTION END Check vehicle speed sen
13. F70 COOLING COOLING LG R FAN 1 MOTOR 2 2 IL 1 2 B B LG R e rs RFRL ean a 22 F101 E11 E37 REFER TO THE FOLLOWING E127 FUSE BLOCK Junction Box J B COED pq 6 7 8 9 Gy a 21514151517 fo 15181218 elope D Le 91011 12 13 14 00 125 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS ACTIVE TEST COOLING FAN MONITOR COOLAN TEMP S SEF111X With air conditioner Cooling fan _ gt Gs 2 2 Without air conditioner Cooling fan orr l2 DV ta U MEF277G B DISCONNECT Cooling fan relay connector g3 amp BR YEC345 Cooling Fan Control Cont d DIAGNOSTIC PROCEDURE INSPECTION START CHECK OVERALL FUNCTION INSPECTION END 1 Turn ignition switch to ON position 2 Select COOLING FAN in ACTIVE TEST mode with CONSULT II OR With Air Conditioner Start engine Set temperature switch at full cold position Turn air conditioner switch to ON position Turn blower fan switch to ON position Run engine at idle for a few minutes with air conditioner operating Make sure that cooling fan oper ates Without Air Conditioner 1 Start engine 2 Kee
14. IGNITION SWITCH REFER TO THE FOLLOWING FUSE BLOCK Junction Box J B E109 E104 FUSE BLOCK Junction Box J B 41216 w o 2 is YEC293 EC GA 98 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Start Signal Cont d DIAGNOSTIC PROCEDURE INSPECTION START A CHECK OVERALL FUNCTION 1 Turn ignition switch to ON posi tion 2 Check START SIGNAL in DATA MONITOR mode with CONSULT II DATA MONITOR START SIGNAL OF CLSDTH P SW ON AIR COND SIG OFF INSPECTION END P N POSI SW ON PEF111P IGN START OR 24 1 Turn ignition switch to START position 2 Check voltage between ECM connector terminal and Q e z m e m ground Voltage Q d oo Ignition switch START 4 Battery voltage Except above Approximately 0V MEC725B 8 DISCONNECT DISCONNECT NG A 4 Check if 10A fuse 40A fusible link and bis Replace 10A fuse or 40A ETE operation of ignition switch is OK fusible link or repair igni ECM CONNECTOR tion switch 34 Ignition Suite connector CHECK INPUT SIGNAL CIRCUIT Check the following GA 1 Turn ignition switch to LOCK posi e Harness connectors tion 150 2 Disconnect ECM harness connector e Harness connectors MEC760B and ignition switc
15. O gt gt emn Oje O O JOJOJOJOJOJO Water gallery Cooling fan JOJOJOJOJOJO O Coolant level low Contaminated cool ant High Possibility Item Low Possibility Item EC GA 57 TROUBLE DIAGNOSIS General Description CONSULT II Reference Value in Data Monitor Mode Remarks e Specification data are reference values e Specification data are output input values which are detected or supplied by the ECM at the connector Specification data may not be directly related to their components signals values operations i e Adjust ignition timing with a timing light before monitoring IGN TIMING Specification data might be displayed even when ignition timing is not adjusted to specification This IGN TIMING monitors the data calculated by the ECM according to the input signals from the camshaft position sensor and other ignition timing related sensors e If the real time diagnosis results are NG and the on board diagnostic system results are OK when diag nosing the mass air flow sensor first check to see if the fuel pump control circuit is normal MONITOR ITEM CMPS RPM REF CONDITION Tachometer Connect Run eng
16. ON position Harness continuity n 4 Check voltage between ignition coil con between battery power TS nector terminal 7 and ground with supply and ignition df CONSULT II or tester Switch Ignition coil 7 8 Voltage Battery voltage Harness connectors harness connector D OK Harness connectors 5 Harness for open short circuit between igni tion and ignition switch If NG replace 40A fusible link or repair ignition switch B harness or connectors DISCONNECT B v NG X GA CHECK GROUND CIRCUIT Repair harness or connec TS 1 Turn ignition switch to LOCK position tors 2 Disconnect power transistor harness ARE 5 6 F33 connector Poweriransietoi 3 Check harness continuity between power CORDERO B transistor connector terminal 2 and engine ground E Continuity should exist If OK check harness for short circuit OK SEF469Q i CHECK INPUT SIGNAL CIRCUIT NG Repair harness or connec 1 Disconnect ECM harness connector tors 2 Check harness continuity between ECM 4 4 connector terminal 1 and power tran HS TS sistor connector terminal 1 Continuity should exist lt Lat CONNECTOR GEBED If OK check harness for short circuit WIB W B Power CHECK COMPONENTS Replace malfunctioning transistor Ignition coil power transistor 1 5 Refer to COMPONENT INSPECTION
17. perature sensor harness connector 2 Connect engine coolant temperature sensor harness connector to engine coolant temperature sensor MODE BACK LIGHT COPY C2QUD01 DATA MONITOR MONITOR NO DTC VEHICLE SPEED SE Replace heated oxygen sensor P N POSI SW OFF 1 See M R F C MNT in Data monitor mode 2 Maintaining engine at 2 000 rpm under no load engine is warmed up sufficiently check that the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds IGN 1 time RICH gt LEAN RICH 2 times RICH gt LEAN gt RICH gt LEAN EEA TROS m OR E C2DMM02 CHK 1 Set Heated oxygen sensor monitor in diag y gc Q8 nostic test mode II Data link connector for CONSULT See page 33 I Connect GHI ang oai terminals 2 Maintaining engine at 2 000 rpm under no load with a suitable harness ii YEC324 check that the malfunction indicator on the instrument panel goes ON and OFF more than 5 times during 10 seconds NG OK v 30 BASIC SERVICE PROCEDURE Idle Speed Ignition Timing Idle Mixture Ratio Adjustment Cont d Connect heated oxygen sensor harness connector to heated oxygen sensor Check fuel pressure regulator See page menna oo Check mass air flow sensor
18. 10 2 cylinder 112 No 4 cylinder SEF485Q NG Replace injector Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness con nector Reconnect ECM harness con nector and retest INSPECTION END COMPONENT INSPECTION Injector 1 Disconnect injector harness connector 2 Check resistance between terminals as shown in the figure Resistance 10 14Q at 25 C 77 F If NG replace injector 32 559 112 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Fuel Pump SYSTEM DESCRIPTION Engine speed Camshaft position sensor Start signal Ignition switch ECM Engine control The ECM activates the fuel pump for several sec onds after the ignition switch is turned on to improve engine startability If the ECM receives a 180 signal from the camshaft position sensor it knows that the engine is rotating and causes the pump to operate If the 180 signal is not received when the ignition switch is on the engine stalls The ECM stops pump operation and prevents bat tery discharging thereby improving safety The ECM does not directly drive the fuel pump It con trols the ON OFF fuel pump relay which in turn supplies voltage to the fuel pump Condition module Fuel pump operation Ignition switch is turned to ON Engine running and cranking Operates fo
19. O flow sensor is displayed value is indicated COOLAN TEMP S e The engine coolant temperature When the engine coolant temperature C or F determined by the signal voltage of sensor is open or short circuited ECM O the engine coolant temperature sen enters fail safe mode The engine sor is displayed coolant temperature determined by the ECM is displayed O2 SEN V e The signal voltage of the heated oxy O gen sensor is displayed M R F C MNT e Display of heated oxygen sensor sig After turning ON the ignition switch RICH LEAN nal during air fuel ratio feedback con RICH is displayed until air fuel mix trol ture ratio feedback control begins RICH means the mixture became e When the air fuel ratio feedback is O rich and control is being effected clamped the value just before the toward a leaner mixture clamping is displayed continuously LEAN means the mixture became lean and control is being effected toward a rich mixture VHCL SPEED SE e The vehicle speed computed from the km h or mph O vehicle speed sensor signal is dis played BATTERY VOLT V e The power supply voltage of ECM is O displayed START SIGNAL e Indicates ON OFF condition from the e After starting the engine OFF is dis ON OFF starter signal played regardless of the starter signal CLSD THL POSI e Indicates the closed throttle position ON OFF ON OFF determined by the throttle position sensor signal O ON Cl
20. SEF806S Cooling Fan Control Cont d COMPONENT INSPECTION Cooling fan relay Check continuity between cooling fan relay terminals and 5 Conditions Continuity 12V direct current supply between NM terminals 1 and 2 No current supply No If NG replace relay Cooling fan motors 1 and 2 1 Disconnect cooling fan motor harness connectors 2 Supply cooling fan motor terminals with battery voltage and check operation Terminals Cooling fan motor Cooling fan motor should operate If NG replace cooling fan motor EC GA 128 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Power Steering Oil Pressure Switch Pp dn EC PST SW 01 PWST PU W Detectable line for DTC Non detectable line for PU W F70 E65 PU W POWER STEERING OIL PRESSURE SWITCH L dn 11 7 LN HH GY 617 8 97 Gv fo Dus os propri er prio na pre 8 9 10 11 12 13 14 YEC301 EC GA 129 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Power Steering Oil Pressure Switch Cont d COMPONENT DESCRIPTION The power steering oil pressure switch is attached to the power steering high pressure tube and detects a power steering load When a power steering load is detected it signals the ECM The ECM adjusts the IACV AAC valve to increase the idle speed and adjust for the increased load Power stee
21. Select HI SPEED in DATA MONITOR with CONSULT II THRTL POS SEN CLSD THL POSI Below is the data for THRTL POS SEN and CLSD THL POSI when depressing the accelerator pedal with the ignition switch ON The signal of THRTL POS SEN should rise gradually without any intermittent drop or rise after CLSD THL POSI is changed from ON to OFF CLSD THL POSI 00 09 THRTL POS SEN 00 09 10 22 402 69 10 22 402 69 0 13 26 38 51 Full Release Full Depress SEF841S 5 REF MAS AIR FL SE THRTL POS SEN O2 SENSOR INJ PULSE Below is the data for CMPS RPM REF MAS AIR FL SE THRTL POS SEN O2 SENSOR and INJ PULSE when revving quickly up to 4 800 rpm under no load after warming up engine sufficiently Each value is for reference the exact value may vary CMPS RPM REF should increase gradually _8 while depressing the accelerator pedal x should decrease gradually after releasing the c pedal without any intermittent drop or rise c 58 68 On iu ot e gt MAS AIR FL SE should increase when S N depressing the accelerator pedal and should x decrease at the moment THRTL POS SEN is aa A ESA closed accelerator pedal is released d c p 1 Qu gt 8 SEF059P EC GA 60 TROUBLE DIAGNOSIS Gen
22. if one exists RUNNING Running engine is required for the ECM to detect a malfunction if one exists 2 The OVERALL FUNCTION is a simplified and effective way to inspect a component or circuit In some cases the OVERALL FUNCTION CHECK is used rather than a DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE When no DTC CONFIRMATION PROCEDURE is available the NG result of the OVERALL FUNCTION CHECK can be con sidered to mean the same as a DTC detection e During an NG OVERALL FUNCTION CHECK the DTC might not be confirmed EC GA 50 TROUBLE DIAGNOSIS General Description Diagnostic Trouble Code DTC Chart Cont d Check Items Possible Cause DTC i CONFIRMA TION PROCE DURE Quick Ref e OVERALL FUNC TION CHECK Quick Ref Fail Safe System X Applicable Not applicable Reference Page e Harness or connectors The sensor circuit is open or short circuited Camshaft position sensor Starter motor EL section Starting system circuit EL section Dead Weak battery RUNNING Harness or connectors The sensor circuit is open or short circuited e Mass air flow sensor e Harness or connectors The sensor circuit is open or short circuited e Engine coolant temperature sensor RUNNING IGN ON RUNNING e Harness or connectors The ignition primary circuit is open or short cir cuited Power transistor unit Resistor Cam
23. 2 Disconnect ECM harness connector from MEF031DB ECM 3 Disconnect heated oxygen sensor harness connector Then connect harness side termi nal for heated oxygen sensor to ground with H S a jumper wire ECM 4 Check for continuity between terminal No 19 19 of ECM harness connector and body ground T GA Continuity exists Continuity does not exist SEF194RA ACTIVE TEST COOLANT TEMP XXX MONITOR CMPS RPM REF INJ PULSE 1 Connect battery ground cable 2 Select ENG COOLANT TEMP in ACTIVE TEST mode 3 Set COOLANT TEMP to 20 68 F by touching Qu and Qd and UP DWN OR 24 1 Disconnect engine coolant tempera ture sensor harness connector Engine coolant temperature sensor 2 Connect a resistor 2 5 kQ between narngss connector terminals of engine coolant tempera 112 212 ture sensor harness connector M Start engine and warm it up until engine coolant SEF750S temperature indicator points to middle of gauge E SEF935W EC GA 29 BASIC SERVICE PROCEDURE Idle Speed Ignition Timing Idle Mixture Ratio Adjustment Cont d Race engine two or three times under no load then run engine at idle speed After checking CO 1 Touch BACK 24 1 Disconnect the resistor from terminals of engine coolant tem
24. 21 Camshaft position sensor connector F33 SEF788S 1 Start engine 2 Check voltage between camshaft position sensor connector terminal and ground with DC range or check pulse signal with oscilloscope under the following conditions Condition Idle 2 000 rpm Voltage 1 5 3 0V 1 5 3 0V 6 i 6 eee ee eee 4 4 4 0 NN L o2 DEB M UE UI Pulse signal NEF370 NEF371 3 If NG replace distributor assembly with camshaft position sensor After this inspection diagnostic trouble code No 11 might be displayed with camshaft position sensor functioning properly Erase the stored memory EC GA 76 TROUBLE DIAGNOSIS FOR DTC 12 Hot wire SEF154N SEF695K H Gee body 1 5 US So Mass air flow sensor harness connector Mass Air Flow Sensor MAFS The mass air flow sensor measures the intake air flow rate by analysing from the mass air flow sensor are received by the ECM as on electrical input signal which has a voltage level tional to a part of the entire flow Measurements the amount of heat emitted from the hot wire placed in the stream of the intake air When intake air flows into the intake manifold through a route around the hot wire the heat generated from the hot wire is taken connected away by the air The
25. 73 TROUBLE DIAGNOSIS FOR DTC 12 77 Mass Air Flow Sensor 77 TROUBLE DIAGNOSIS FOR 13 81 Engine Coolant Temperature Sensor 5 81 TROUBLE DIAGNOSIS FOR DTC 21 85 Fuel Pump ect ine trit 113 Ignition Signal esee 85 Idle Air Control Valve IACV Auxiliary Air TROUBLE DIAGNOSIS FOR DTC 43 90 Control AAC 117 Throttle Position Sensor 90 IACV FICD Solenoid Valve 121 TROUBLE DIAGNOSIS FOR Cooling Fan 2 124 NON DETECTABLE 95 Power Steering Oil Pressure Switch 129 Vehicle Speed Sensor 55 95 Neutral Position 132 Start Signal 98 Electrical Load 135 EGR Valve and EVAP Canister Purge Control MI Data Link Connectors 141 Solenoid 2 100 SERVICE DATA AND SPECIFICATIONS SDS 142 Heated Oxygen Sensor 25 105 General 142 ze 110 Inspection and Adjustment 142 When y
26. Continuity should exist switch fan switch and Blower fan switch OFF ground Continuity should not exist e Fan switch OK Refer to HA section If NG repair harness or connectors Disconnect and reconnect harness connectors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage or loose connection of ECM harness connector Reconnect ECM harness connector and retest INSPECTION END EC GA 138 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Electrical Load Signal Cont d 5 PROCEDURE A AE Check rear window defogger circuit Refer to REAR WINDOW DEFOGGER in EL sec tion Check if rear window defogger func tions normally Fuse block ECM CONNECTOR connector OK 33 40 ll R CHECK INPUT SIGNAL CIRCUIT Check the following 1 Turn rear window defogger switch e Harness connectors to OFF position 12 F103 2 Turn ignition switch to LOCK posi e Harness for open or tion short circuit between F101 3 Disconnect ECM harness connector and fuse block and fuse block harness connector If NG repair harness or 4 Check harness continuity between connectors YEC348 ECM connector terminal 9 and fuse block harness connector termi 4 Continuity should exist If OK check harness for short cir cuit
27. Lon Disconnect and reconnect harness connectors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness con nector Reconnect ECM harness con nector and retest INSPECTION END EC GA 139 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Electrical Load Signal Cont d PROCEDURE B DISCONNECT Combination switch HS lighting switch connector Check if lamps light when lighting NG Check lighting switch ECM lo CONNECTOR switch is turned to position circuit and headlamp cir 33 9 6 5 7 8 10 cuit Refer to NATION SWITCH and HEADLAMP EL sec tion 6c CHECK INPUT SIGNAL CIRCUIT NG Check the following as shown Headlamp relay LH 1 Turn ignition switch to LOCK posi e Harness connectors connector tion R Y 2 Disconnect ECM harness connector e Harness connectors 12 and lighting switch harness 52 tor or headlamp relay LH e Diode 3 Check harness continuity between e Harness for open or YEC349 ECM connector terminal 9 and short circuit between combination switch lighting switch lighting switch and connector terminal or headlamp ECM relay LH connector terminal e Harness for open or Continuity should exist short circuit between If OK check harness for sho
28. be kept small 4 Be sure to ground the radio to vehicle WHEN STARTING Do not depress accelerator pedal when starting Immediately after starting do not rev up engine unnecessarily FUEL PUMP Do not rev up engine just prior to shutdown Do not operate fuel pump when there is no fuel in lines Tighten fuel hose clamps to the specified torque Refer to EM section ENGINE CONTROL MODULE HARNESS HANDLING Correct engine control module harness connectors securely A poor connection can cause an extremely high surge voltage to develop in coil and condenser resulting in damage to ICs Keep engine control module harness at least 10 cm 3 9 in away from adjacent harnesses to prevent an engine control module system malfunction due to receiving external noise degraded operation of ICs etc Keep engine control module parts and harnesses dry Before removing parts turn off ignition switch and then disconnect battery ground cable NEF561 EC GA 4 PRECAUTIONS AND PREPARATION Precautions for Engine Control Module Trouble Diagnosis of Engine CAUTION Be sure to turn the ignition switch OFF and disconnect the negative battery terminal before any repair or inspection work The open short circuit of related switches sensors solenoid valves etc will cause malfunction Be sure to connect and lock the connectors securely after work A loose
29. disconnected the diagnostic trouble code will be lost from the backup memory within 24 hours e Becareful not to erase the stored memory before starting trouble diagnoses EC GA 34 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION Malfunction Indicator MI Cont d SELF DIAG RESULTS If the MI flashes or NATS MALFUNCTION is displayed on SELF DIAG RESULTS screen perform self diag nostic results mode with CONSULT II using NATS pro gram card NATS E960 Refer to EL section Confirm no self diagnostic results of NATS is displayed before touching ERASE in SELF DIAG RESULTS mode with CONSULT II When replacing ECM initialisation of NATS V 2 0 system and registration of all NATS V 2 0 ignition key IDs must be carried out with CONSULT II using NATS program card NATS E960 Therefore be sure to receive all keys from vehicle owner Regarding the procedures of NATS initialisation and NATS ignition key ID registration refer to CONSULT II operation manual NATS V 2 0 DIAGNOSTIC TEST MODE Il HEATED OXYGEN SENSOR MONITOR In this mode the MALFUNCTION INDICATOR displays the condition of the fuel mixture lean or rich which is monitored by the heated oxygen sensor MALFUNCTION INDICATOR Fuel mixture condition in the exhaust gas Air fuel ratio feedback control condition ON Lean Closed loop system OFF Rich 1 Remains ON or OFF Any condition Open loop system 1 Maintains conditions just before switching
30. engine OR 50 1 Turn ignition switch to ON position 2 Start engine 3 Turn ignition switch to LOCK position wait at least 5 seconds and then turn to ON position 4 Perform Diagnostic Test Mode II Self diagnostic results with ECM EC GA 85 Ignition Signal Cont d TROUBLE DIAGNOSIS FOR DTC 21 y o E o 58 42 5 o CIS LL A s 5 O 5 8 9 1 o Oo ra 2 5 5 5 2 2 0 wn 2 2 lt oc z fr HE 5 to x e pu gt gt E i 0 59 oc mja amp 5 lt Re WO I ga 5 2 2 amp wJo 9 EE 5 e lt A 95 EEG 5 GY Ww 2 BATTERY Los 718 i 41216 291 EC GA 86 TROUBLE DIAGNOSIS FOR DTC 21 Ignition Signal Cont d ev DIAGNOSTIC PROCEDURE INSPECTION START Turn ignition switch to LOCK position and Yes restart engine Is engine running NG m power Tum ignition switch to OFF position 404 fusible ink CONES 2 Disconnect ignition coil harness connec Condition and operation tor of ignition switch 3 Turn ignition switch to
31. for open or ing oil pressure connector terminal 2 short circuit between Continuity should exist ECM and power steering If OK check harness for short circuit oil pressure switch If NG repair harness or connectors CHECK COMPONENT NG Replace power steering oil Power steering oil pressure switch pressure switch Refer to COMPONENT INSPECTION below Los Disconnect and reconnect harness connec tors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage and check the connection of ECM harness con nector Reconnect ECM harness connector and retest INSPECTION END A 7 Power steering oil pressure Switch c AEC762 COMPONENT INSPECTION Power steering oil pressure switch 1 Disconnect power steering oil pressure switch harness con nector then start engine 2 Check continuity between power steering oil pressure switch terminals and Conditions Continuity Steering wheel is being turned Yes Steering wheel is not being turned No If NG replace power steering oil pressure switch EC GA 131 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Neutral Position Switch ECM F101 NEUT EC PNP SW 01 G OR Detectable line for DTC m Non detectable line for DTC NEUTRAL POSITION SWITCH NEUTRAL OTHER i e e
32. harness OK INSPECTION END Check CO x SS Replace heated oxygen sensor sary Check emission control parts and repair or replace if neces Check heated oxygen sensor function pO EC GA 24 BASIC SERVICE PROCEDURE Idle Speed Ignition Timing Idle Mixture Ratio Adjustment Cont d START Visually check the following e Air cleaner clogging e Hoses and ducts for leaks e Electrical connectors e Gasket SEF935W e Throttle valve and throttle position sensor operation e NVE I 3 5 Start engine and warm it up until engine coolant tem z 6 perature indicator points to the middle of gauge SE 4 Ensure engine stays below 1 000 rpm 7 1 Ox 8 7 1000 r min N Open engine hood and run engine at about 2 000 rpm SEF247F for about 2 minutes under no load Perform ECM on board diagnostic system Diagnostic test mode Il OK NG N Repair or replace components as neces sary SAT652J D y Run engine at about 2 000 rpm for about 2 minutes under no load Race engine two or three times under no load then run engine for about 1 minute at idle speed SEF248F EC GA 25 BASIC SERVICE PROCEDURE Idle Speed Ignition Timing Idle Mixture Ratio Adjustment Cont d 1 Tur
33. intensity of heat detected depends on the volume of air flow and in addition current com pensation is introduced so that the temperature of the hot wire is automatically controlled within a limited range C F Therefore when the volume of the air flow is increased it is nec essary to supply the hot wire with more electric current in order to maintain the temperature of the hot wire This enables the ECM to determine the volume of the air flow by means of the electric change Diagnostic Check Items Trouble Malfunction is detected when 2 Possible Cause Code No 12 e An excessively high or low voltage from the mass Harness or connectors air flow sensor is entered to ECM The sensor circuit is open or shorted e Mass air flow sensor DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE 1 Turn ignition switch to position and wait at least 6 seconds Select DATA MONITOR mode with CONSULT II 3 Start engine and wait at least 3 seconds AAA 1 Turn ignition switch to position and at least lt 6 seconds Start engine and at least 3 seconds 3 Turn ignition switch to LOCK position wait at least 5 seconds and then turn to position 4 Perform Diagnostic Test Mode Self diagnostic results with ECM EC GA 77 TROUBLE DIAGNOSIS FOR DTC 12 Mass Air Flow Sensor MAFS Cont d BATTERY EC MAFS 01 Refer to EL POWER De
34. is operating ON and or lighting switch is on LOAD SIGNAL e Ignition switch ON Rear window defogger is not operat 2 SPD OFF ing and lighting switch is not on Idle 2 4 3 2 msec INJ PULSE 2 000 rpm 1 9 3 2 msec EC GA 58 TROUBLE DIAGNOSIS General Description CONSULT II Reference Value Data Monitor Mode Cont d MONITOR ITEM CONDITION SPECIFICATION e Engine After warming up Idle 2 10 BTDC Sey e No load 2 000 rpm More than 20 BTDC e Engine After warming up Idle 0 40 IACV AAC V Air conditioner switch OFF Shift lever N e No load 2 000 rpm A F ALPHA Engine After warming up ae 000 75 125 AIR COND RLY e Air conditioner switch OFF OFF gt Ignition switch is turned to ON Operates for 5 seconds Engine running and cranking ON FUEL PUMP RLY When engine is stopped stops 1 0 seconds e Except as shown above OFF When cooling fan is stopped OFF COOLING FAN When cooling fan operates at low speed LOW When cooling fan operates at high speed HI Engine After warming up Idle ON Air conditioner switch OFF EGRC SOL V Shift lever Revving engine from idle to OFF No load 3 000 rpm in 1st position EC GA 59 TROUBLE DIAGNOSIS General Description Major Sensor Reference Graph in Data Monitor Mode The following are the major sensor reference graphs in DATA MONITOR mode
35. on Not turned on EC GA 49 TROUBLE DIAGNOSIS General Description Diagnostic Trouble Code DTC Chart ENGINE RELATED ITEMS Detected items Diagnostic trouble code Screen terms for CONSULT II Malfunction is detected when No SELF DIAG RESULTS mode 11 Camshaft position sensor circuit e 180 signal is not sent to the ECM for the first few seconds during CAMSHAFT POSI SEN engine cranking e The pulse width of 180 signal is smaller than the specified value 12 Mass air flow sensor circuit e An excessively high or low voltage is sent to ECM MASS AIR FLOW SEN 13 Engine coolant temperature sensor e An excessively high or low voltage from the sensor is sent to the circuit ECM COOLANT TEMP SEN 21 Ignition signal circuit e The ignition signal in the primary circuit is not sent to the ECM during IGN SIGNAL PRIMARY engine cranking or running 28 OVER HEAT e The engine coolant temperature sensor output voltage is below 0 35V 43 Throttle position sensor circuit e An excessively low or high voltage from the sensor is sent to the THROTTLE POSI SEN ECM 55 No failure e No malfunction is detected by the ECM NO SELF DIAGNOSTIC FAILURE INDICATED 1 This is Quick Reference of DTC CONFIRMATION PROCEDURE Details are described in each TROUBLE DIAGNOSIS FOR DTC Abbreviations are as follows IGN ON Turning the ignition switch ON is required for the ECM to detect a malfunction
36. output signal inspection before replacement OLD ONE REY al f g Y 7 d SAT652J Battery voltage Harness connector for solenoid valve SEF348N Value inspection and make sure ECM functions properly Refer to EC GA 62 After performing each TROUBLE DIAGNOSIS perform OVERALL FUNCTION CHECK or DTC Diagnostic Trouble Code CONFIRMATION PROCEDURE The DTC should not be displayed in the DTC CONFIR MATION PROCEDURE if the repair is completed suc cessfully The OVERALL FUNCTION CHECK should be a good result if the repair is completed successfully When measuring ECM signals with a circuit tester never allow the two tester probes to contact Accidental contact of probes will cause a short circuit and may damage the ECM power transistor EC GA 6 ircuit Diagram ENGINE AND EMISSION CONTROL OVERALL SYSTEM GA16DE C aH ideoxa P 5 1 10 dwejpeay NON3X 09 T S L VN HOLIMS n ON 1n0UlM v NOILISOd T HO LIMS ov WHLNAN fe 3unss3ud 710 ONINSSLS H3MOd pletet HOL
37. purge control solenoid valve control vacuum line valve To EGR valve and EVAP canister To intake 4 air ale This causes the port vacuum to be discharged into the atmosphere so that the EGR valve and EVAP canister purge line remains closed Engine starting Closed throttle position Low and high engine coolant temperature During deceleration Engine stopped Vehicle speed below 10 km h 6 mph Mass air flow sensor malfunction COMPONENT DESCRIPTION Exhaust gas recirculation EGR valve The EGR valve controls the amount of exhaust gas routed to the intake manifold Vacuum is applied to the EGR valve in response to the throttle valve opening The vacuum controls the movement of a taper valve connected to the vacuum diaphragm in the EGR EGR valve and EVAP canister purge control solenoid The EGR valve and EVAP canister purge control solenoid valve responds to signals from the ECM When the ECM sends an ON ground signal the coil in the solenoid valve is energized A Intake plunger will then move to cut the vacuum signal from the throttle body to the EGR valve and EVAP canister purge valve signal When the ECM sends an OFF signal the vacuum signal passes SEF240PF through the solenoid valve The signal then reaches the EGR valve and EVAP canister EC GA 100 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS EGR Valve and EVAP Canister Purge Control Solenoid Valve Cont d
38. replace EGR valve EGR valve MEF137D EGRC BPT valve 1 Plug one of two ports of EGRC BPT valve 2 Vacuum from the other port and check for leakage while applying a pressure above 0 981 kPa 9 81 mbar 100 mmH 0O 3 94 from under EGRC BPT valve 3 If a leakage is noted replace the valve SEF083P EGR valve and EVAP canister purge control solenoid valve Check air passage continuity Air passage Air passage Condition continuity continuity between and between and 12V direct current sup BATTERY ply between terminals Yes No MEC488B ome No supply No Yes If NG replace solenoid valve EC GA 104 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS SYSTEM DESCRIPTION Heated Oxygen Sensor HO2S Heated oxygen sensor heater control Engine speed Engine ECM Heated oxygen Crankshaft position sensor control mod ule sensor heater The ECM performs ON OFF control of the heated OPERATION oxygen sensor heater corresponding to the engine speed Holder Louver Heater pad Isolation Zirconia bearing tube SEF406H Output voltage V v 1 Rich 5 Ideal ratio ean Mixture ratio P RN Heated oxygen sensor harness connector A Engine speed rpm Heated oxygen sensor heater Above 3 200 OFF Below 3 200 ON COMPONENT DESCRIPTION The heated oxygen sensor is placed into the fr
39. to open loop To check the heated oxygen sensor function start engine in Diagnostic Test Mode Then warm it up until engine coolant temperature indicator points to middle of gauge Next run engine at about 2 000 rpm for about 2 minutes under no load conditions Make sure that the MAL FUNCTION INDICATOR comes ON more than 5 times within 10 seconds with engine running at 2 000 rpm under no load EC GA 35 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT II CONSULT II INSPECTION PROCEDURE 1 Turn off ignition switch 2 Connect CONSULT II to data link connector for CON SULT II Data link connector for CONSULT II is located behind the fuse box cover Data link connector for CONSULT II SAT703J 3 Turn on ignition switch 4 Touch START 5 Touch ENGINE 6 Perform each diagnostic test mode according to each service DIAGNOSIS MODE SELECTION procedure WORK SUPPORT For further information see the CONSULT II Operation Ma SELF DIAG RESULTS nual DATA MONITOR ACTIVE TEST DTC CONFIRMATION ECM PART NUMBER 2160 EC GA 36 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT II Cont d ENGINE CONTROL MODULE COMPONENT PARTS CONTROL SYSTEMS APPLICATION DIAGNOSTIC TEST MODE SELF DIAG NOSTIC RESULTS WORK SUPPORT Camshaft position sensor DATA MONITOR ACTIVE TEST Mass air flow senso
40. valve e Check for clicking sound when applying 12V direct current to IACV FICD solenoid valve terminals e Check plunger for seizing or sticking Washer e Check for broken spring C i Spring Plunger SEF163N EC GA 123 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Cooling Fan Control SYSTEM DESCRIPTION Vehicle speed Vehicle speed sensor ECM Engine Cooling control fan relay module The ECM controls the cooling fan corresponding to the vehicle speed engine coolant temperature and air conditioner ON signal The control system has 2 step control ON OFF Engine coolant temperature Engine coolant temperature sensor Air conditioner signal Air conditioner switch Operation 5 m Air conditioner switch is OFF E m Air conditioner switch is ON 50 8o o E g 2 t t s 5 97 207 9 97 207 m 20 80 20 80 12 50 12 50 Vehicle speed km h mph Vehicle speed km h mph 1 Cooling fans do not operate Cooling fans operate SEF799S Cooling fan relay 1 EC GA 124 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Cooling Fan Control Cont d EC COOL F 01 BATTERY via fusible link 5 FUSE A 10A BLOCK S 40A Refer to EL POWER E127 With G D gt BR Dectable line for DTC Non detectable line for DTC GIR ex
41. with CON SULT II or voltage tester Voltage Approximately 5V E pe CHECK GROUND CIRCUIT 1 Turn ignition switch to LOCK posi tion 2 Check harness continuity between engine coolant temperature sensor connector terminal 1 and engine ground Continuity should exist If OK check harness for short cir Cuit Check the following e Harness for open or short circuit between ECM and engine cool ant temperature sen sor If NG repair harness or connectors Check the following e Harness for open or short circuit between ECM and engine cool ant temperature sen sor If NG repair harness or connectors CHECK COMPONENT Engine coolant temperature sensor Refer to COMPONENT INSPEC TION on next page Replace engine coolant temperature sensor Disconnect and reconnect harness connectors in the circuits Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness con nector Reconnect ECM harness con nector and retest INSPECTION END EC GA 83 TROUBLE DIAGNOSIS FOR DTC 13 Engine Coolant Temperature Sensor ECTS Cont d COMPONENT INSPECTION Engine coolant temperature sensor Check resistance as shown in the figure Temperature C F Resistance kQ 20 68 21 28 50 122 0 68 1 00 SEF152P 90 194 0 236 0 260
42. with a suitable harness Wait at least 2 seconds 27 LI ae Jm Data link connector for CONSULT II Connect CHK and IGN terminals with a suitable harness DIAGNOSTIC TEST MODE II SELF DIAGNOSTIC RESULTS _ TERS ERE s mz Data link connector for CONSULT II Connect CHK and IGN terminals with a suitable harness l Wait at least 2 seconds 0 TERS TE 53 59 Data link connector for CONSULT II Connect CHK and IGN terminals with a suitable harness 9 Diagnostic Test Mode MALFUNCTION WARNING Start engine e Switching the diagnostic test mode is not possible when the engine is running When ignition switch is turned off during diagnosis power to ECM will drop after approx 5 seconds The diagnosis will automatically return to Diagnostic Test Mode I EC GA 33 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION Malfunction Indicator Cont d DIAGNOSTIC TEST MODE I BULB CHECK In this mode the MALFUNCTION INDICATOR on the instrument panel should stay ON If it remains OFF check the bulb Refer to EL section WARNING LAMPS AND CHIME or see EC GA 141 DIAGNOSTIC TEST MODE MALFUNCTION WARNING MALFUNCTION INDICATOR Condition ON Engine coolant temperature sensor circuit malfunction or overheating is detected or the ECM s CPU is malfunctioning No malfunc
43. 0 kg m 15 20 ft lb EC GA 23 BASIC SERVICE PROCEDURE Idle Speed Ignition Timing Idle Mixture Ratio Adjustment PREPARATION Make sure that the following parts good order 1 Battery 2 Ignition system 3 Engine oil and coolant levels 4 Fuses 5 ECM harness connector 6 Vacuum hoses 7 Air intake system Oil filler cap oil level gauge etc 8 Fuel pressure 9 10 Throttle valve 11 EGR valve operation 12 Evaporative emission system Overall inspection sequence INSPECTION _ On models equipped with air conditioner checks should be carried out while the air conditioner is OFF On models equipped with automatic trans axle when checking idle speed ignition timing and mixture ratio checks should be carried out while shift lever is in N posi tion When measuring CO percentage insert probe more than 40 cm 15 7 in into tail pipe Turn off headlamps heater blower rear window defogger Keep front wheels pointed straight ahead Make the check after the cooling fan has stopped Perform diagnostic test mode Self diagnostic results Check 8 adjust ignition timing Check amp adjust idle speed NG gt Repair or replace Check heated oxygen sensor function harness Check heated oxygen sensor Repair or replace
44. 0A fuse or engine control module relay E or repair harness or connec tors 4630 By CHECK GROUND CIRCUIT NG Repair harness or connec 1 Turn ignition switch to LOCK position tors 2 Loosen and retighten engine ground screws 3 Check harness continuity between cam shaft position sensor connector terminal 6 and engine ground Continuity should exist If OK check harness for short circuit WS CHECK INPUT SIGNAL CIRCUIT NG Repair harness or connec NEF126A 1 Disconnect ECM harness connector tors 2 Check harness continuity between cam shaft position sensor connector terminal Yn DISCONNECT T and ECM connector terminals 6 amp J Continuity should exist gt lt 41516 If OK check harness for short circuited 31 40 Camshaft position sensor connector 1 OK CHECK COMPONENT s Replace camshaft position id Camshaft position sensor sensor Refer to COMPONENT INSPECTION on Ga next page SEF787S OK Disconnect and reconnect harness connec tors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness connector Reconnect ECM harness connector and retest INSPECTION END EC GA 75 TROUBLE DIAGNOSIS FOR DTC 11 Camshaft Position Sensor CMPS COMPONENT INSPECTION Camshaft position sensor GELE
45. 1444546 47 48 SEF131RA EC GA 62 ECM INSPECTION TABLE NO TROUBLE DIAGNOSIS General Description ECM Terminals and Reference Value Specification data reference values and are measured between each terminal and terminal Engine control module ground TERMINAL WIRE COLOR ITEM CONDITION DATA 0 2 0 3V V 6 Engine is running Warm up condition meee es 158 Idle speed 0 NEF346 1 W B lgnition signal Approximately 0 7V V jg 6 Engine is running W nmn Engine speed is 2 000 rpm 1 pls NEF347 1 0 1 3V V 15 Engine is running Warm up condition L Idle speed tome NEF348 L OR Tachometer Approximately 3V v 15 Engine is running T 8 L Engine speed is 2 000 rpm sog NEF349 Approximately 13V 30 Engine is running Warm up condition SUECCEELET Y PU Ignition check NEF350 Engine is running L Engine speed is 2 000 rpm EC GA 63 Approximately 13V NEF351 TROUBLE DIAGNOSIS General Description ECM Terminals and Reference Value
46. 36 Approximately Vacuum hose is disconnected 294 2 94 3 0 43 Inspection and Adjustment Idle speed 1 rpm Models with daytime light system 800 50 No load 2 Models without daytime light system 750 50 Air conditioner ON 900 or more Ignition timing 10 2 BTDC Throttle position sensor 0 35 0 65 idle position 3 V 1 Feedback controlled and needs no adjustments 2 Under the following conditions Air conditioner switch OFF Electric load OFF Lights heater fan amp rear defogger 8 Engine is warmed up sufficiently IGNITION COIL Primary voltage 12 Primary resistance at 20 C 68 F Approximately 2 Secondary resistance at 20 C 68 F Approximately 12 Supply voltage Battery voltage 1 4 1 8 Engine is warmed up sufficiently and idling under no load Output voltage ENGINE COOLANT TEMPERATURE SENSOR Temperature Resistance 20 68 2 1 2 9 50 122 0 68 1 00 90 194 0 236 0 260 HEATED OXYGEN SENSOR HEATER Resistance at 25 C 77 2 3 4 3 FUEL PUMP Resistance at 25 C 77F Q Approximately 0 2 5 IACV AAC VALVE Resistance at 25 C 77F Q Approximately 10 INJECTOR Resistance at 25 77F Q Approximately 10 14 RESISTOR Resistance at 25 C 77 Approximately 2 2 THROTTLE POSITION SENSOR Resistance kQ Accelerator pedal conditions at 25 77 Co
47. 4S DISCONNECT Heated oxygen sensor connector SEF646P DISCONNECT dn DISCONNECT ECM chin 102 Heated oxygen sensor connector RIY SEF795S CHECK HEATED OXYGEN SENSOR HEATER CIRCUIT 1 Reconnect harness connectors 2 Start engine 3 Check voltage between ECM connector terminal and ground with CON SULT II or tester under the following conditions Voltage Engine speed is below 3 200 rpm Approximately Engine speed is above 3 200 rpm Battery voltage NG CHECK POWER SUPPLY 1 Stop engine 2 Disconnect heated oxygen sensor har ness connector 3 Turn ignition switch to ON position 4 Check voltage between heated oxygen sensor connector terminal 3 and ground Voltage Battery voltage CHECK OUTPUT SIGNAL CIRCUIT 1 Turn ignition switch to LOCK position 2 Disconnect ECM harness connector 3 Check harness continuity between heated oxygen sensor connector termi nal and ECM connector terminal 10 Continuity should exist If OK check harness for short circuit Loosen and retighten engine ground screws Go to CHECK COMPO Check the following Harness connectors Harness connector 10A fuse Harness for open or short circuit between heated oxygen sensor and fuse If NG replace fuse o
48. 8 L OR 9 Engine is running j perature sensor with engine coolant temperature 0 Approximately 1 0V V 1 5 Engine is running SNNNNNNNNE 19 L W Heated oxygen sensor B After warming up sufficiently and engine NEN speed is 2 000 rpm EC GA 64 NEF352 TROUBLE DIAGNOSIS General Description ECM Terminals and Reference Value Cont d TERMINAL WIRE ITEM CONDITION DATA NO COLOR Ignition switch Warm up condition 0 35 0 65V Accelerator pedal released 20 R Throttle position sensor Ignition switch ON Approximately 4V L Accelerator pedal fully depressed Ignition switch ON Approximately 1 5V 24 OR L Malfunction indicator Engine is running BATTERY VOLTAGE 11 14V 1 5 3 0V 6 Engine is running Warm up condition 2 L Idle speed 20ms 31 Camshaft position NEF370 LAN sensor Reference signal 1 5 3 0V Engine is running L Engine speed is 2 000 rpm NEF371 0 Approximately 4 2V Ignition switch ON Raise the vehicle In 1st gear position Vehicle speed is 40 km h 25 mph 32 OR W Vehicle speed sensor mm NEF357 Engine is running BATTERY VOLTAGE Rear window defogger is operating 11 14V L
49. ARD DIAGNOSTIC SYSTEM DESCRIPTION Fuel pump fuse 1 3 Fuel pump Data link connector SEF922W VTX GENERIC II PROGRAM CARD Press ENTER Sample screen SEF398S OBD II FUNCTIONS FO DATA LIST F1 FREEZE DATA F2 DTCS F3 SNAPSHOT F4 CLEAR DIAG INFO F5 02 TEST RESULTS F7 ON BOARD TESTS F8 EXPAND DIAG PROT F9 UNIT CONVERSION Sample screen SEF416S Generic Scan Tool GST Cont d GST INSPECTION PROCEDURE 1 Turn ignition switch OFF 2 Connect GST to data link connector Data link connector is located under the fuse box cover 3 Turn ignition switch ON 4 Enter the program according to instruction on the screen or in the operation manual Regarding GST screens in this section sample screens are shown 5 Perform each diagnostic mode according to each service procedure For further information see the GST Operation Manual of the tool maker EC GA 44 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION Generic Scan Tool GST Cont d FUNCTION Diagnostic test mode Function This mode gains access to current emission related data values including analog MODE 1 READINESS TESTS inputs and outputs digital inputs and outputs distance traveled while MI is acti vated and system status information This mode gains access to emission related data value which were stored by ECM NODES FREEZE DATA during the freeze f
50. Air Control AAC Valve Cont d A Z Thotleposion DIAGNOSTIC PROCEDURE Q INSPECTION START ay RICE X V Bo a 9 SS CHECK OVERALL FUNCTION ii INSPECTION END 1 Start engine and warm it up suffi ciently 2 Check idle speed uisi Models with daytime light system 800 50 rpm Models without daytime light sys Ed 54 700250 rpm If NG adjust idle speed 3 Perform IACV AAC V ADJ in WORK SUP Sm PORT mode with CON SULT II BR 24 Disconnect throttle posi Jes tion sensor harness con e nector 1 4 Make sure that idle speed drops MEC768B NG CHECK POWER SUPPLY 42 1 Stop engine 2 Disconnect valve harness Check the following e Harness connectors us connector e Harness connector 778rpm 3 Turn ignition switch to position 1 71 4 Check voltage between e 10A fuse 85 valve connector terminal 1 e Harness for open or ground short circuit between IACV AAC valve and fuse If NG replace 10A fuse or repair harness or con nectors Voltage Battery voltage 2 101 CHECK OUTPUT SIGNAL CIRCUIT 1 Turn ignition switch to LOCK posi tion 2 Reconnect IACV AAC valve harness connector and then start engine 3 Perform IACV AA
51. C GA 89 TROUBLE DIAGNOSIS FOR DTC 43 SEF089K Throttle Position Sensor The throttle position sensor responds to the accelerator pedal movement This sensor is a potentiometer which converts forms the throttle position into a proportional output voltage which is then used as an input voltage signal to the ECM In addition the sensor detects the opening and closing speed of the throttle valve and so also feeds the rate of change in voltage signal to the ECM Idle position of the throttle valve is determined by the ECM based upon the signal received from the throttle position sensor and also controls engine operation such as fuel cut fo lo Throttle position sensor Supply voltage 45 5V Applied between terminals No 1 and 3 2 and 3 V Output voltage between terminals 0 5 0 0 90 Throttle valve opening angle deg SEF520Q Diagnostic Check Items Trouble Malfunction is detected when Possible Cause Code No 43 e An excessively low or high voltage from the sensor e Harness or connectors is sent to ECM The sensor circuit is open or shorted e Throttle position sensor EC GA 90 TROUBLE DIAGNOSIS FOR DTC 43 THRTL POS SEN START SIGNAL DATA MONITOR MONITOR NO DTC THRTL POS SEN 0 60 V C2MNDO1 CONNECT F101 A 20 21 29 ground MEC722B
52. C V OPEN ING in ACTIVE TEST mode with CONSULT II OR C 2 Disconnect ECM harness con ds nector 3 Check harness continuity between ECM terminal and IACV AAC valve connec tor terminal 2 Continuity should exist If OK check harness for short Repair harness or con nectors connector SB SB MEC769B EC GA 119 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Idle Air Control Valve IACV Auxiliary Air Control AAC Valve Cont d 4 NG Replace IACV AAC IACV AAC valve valve Refer to COMPONENT INSPEC TION below Disconnect and reconnect harness connectors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness con nector Reconnect ECM harness con nector and retest COMPONENT INSPECTION IACV AAC VALVE Check IACV AAC valve resistance Resistance Approximately 100 at 25 C 77 F DISCONNECT e Check plunger for seizing or sticking c R 422 a SEF161N EC GA 120 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS IACV FICD Solenoid Valve IGNITION SWITCH FUSE ca Refer to EL POWER Detectable line for DTC 104 Non detectable line for DTC LG R LG R _ LG R LG R AIR CONDITIONER RELAY THERMO CONTROL AMPLIFIER THERMISTOR
53. Check the following 1 Stop engine e 10A fuse 2 Disconnect injector harness connec e Harness connectors tor 3 Turn ignition switch to e Harness for open or tion short circuit between 4 Check voltage between each injec injector and fuse tor connector terminal 2 and If NG replace fuse or ground with CONSULT II or tester repair harness or con Voltage Battery voltage nectors OK Fuel injector a 2 2 connector NEF385 4 DISCONNECT n gt lt n Injector connectors AEC755 EC GA 111 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Injector Cont d p DISCONNECT DISCONNECT LER 5 101 110 103 112 Injector 1 connectors bre OUTPUT SIGNAL CIRCUIT Check the following Turn ignition switch to LOCK posi e Harness for open or tion short circuit between 2 Disconnect ECM harness ECM and injector 3 tor If NG repair harness or FA 3 Check harness continuity between connectors each injector harness connector ter minal ECM connector termi nals C3 112 Continuity should exist If OK check harness for short cir cuit OK CHECK COMPONENT Injector Refer to COMPONENT INSPEC TION below OK Disconnect and reconnect harness connectors in the circuit Then retest 201 No 1 cylinder 103 3 cylinder
54. Cont d DIAGNOSTIC PROCEDURE DISCONNECT gt Throttle position 11213 F16 sensor connector PIL CHECK POWER SUPPLY Repair harness or connec 1 Turn ignition switch to LOCK position tors 2 Disconnect throttle position sensor har 60 ness connector 3 Turn ignition switch to ON position 4 Check voltage between throttle position sensor connector terminal and ground with CONSULT II or tester Voltage Approximately 5V m ae CHECK GROUND CIRCUIT NG Check the following 1 Turn ignition switch to LOCK position Harness for open or 2 Loosen and retighten engine ground short circuit between screws ECM and throttle position 3 Check harness continuity between sensor throttle position sensor connector termi If NG repair harness or nal and engine ground connectors Continuity should exist If OK check harness for short circuit OK CHECK INPUT SIGNAL CIRCUIT Repair harness or connec 1 Disconnect ECM harness connector tors 2 Check harness continuity between ECM connector terminal and throttle posi tion sensor connector terminal 2 Continuity should exist If OK check harness for short circuit LOK ADJUST THROTTLE POSITION SENSOR E Perform Basic Inspection DISCONNECT E Replace throttle position 3 Throt
55. E RATIO SELF LEARNING CONTROL The mixture ratio feedback control system monitors the mixture ratio signal transmitted from the heated oxygen sensor This feedback signal is then sent to the ECM The ECM controls the basic mixture ratio as close to the theoretical mixture ratio as possible However the basic mixture ratio is not necessarily con trolled as originally designed Both manufacturing differences mass air flow sensor hot film and characteristic changes during operation i e injector clogging directly affect mixture ratio Accordingly the difference between the basic and theoretical mixture ratios is monitored in this system This is then computed in terms of injection pulse duration to automatically compen sate for the difference between the two ratios EC GA 14 ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION No 1 2 No 3 Injection pulse inder NEC GN inder LL JE E 4 TL _ L 1 engine cycle ox Sequential multiport fuel injection system MEF522D No 1 cylinder Tp TIL No 2 cylinder JL TL No 3 cylinder he S 4 cylinder JL TL pm 1 Simultaneous multiport fuel injection system MEF523D Multiport Fuel Injection MFI System Cont d FUEL INJECTION TIMING Two types of systems are used Sequential multiport fuel injection system Fuel is inj
56. ECM Air conditioner relay Fuel Cut Control at no load amp high engine speed Vehicle speed sensor Vehicle speed Neutral position switch Neutral position Throttle position sensor Throttle position Engine coolant temperature sensor Engine coolant temperature Camshaft position sensor Engine speed ECM If the engine speed is above 3 950 rpm with no load for example in neutral and engine speed over 3 950 rpm fuel will be cut off after some time The exact time when the fuel is cut off varies based on engine speed Fuel cut will operate until the engine speed reaches 1 500 rpm then fuel cut is cancelled NOTE This function is different than deceleration control listed under Multiport Fuel Injection MFI System on EC GA 17 EVAPORATIVE EMISSION SYSTEM Description Fuel check valve Vapor vent line To air cleaner EGR valve amp EVAP canister purge control solenoid valve Throttle valve Intake manifold Fuel filler cap with vacuum relief valve Main purge orifice EVAP canister purge control valve Constant purge orifice EVAP canister C3 Air Woe MEF609DB SEF312N The evaporative emission system is used to reduce hydrocar bons emitted into the atmosphere from the fuel system This reduction of hydrocarbons is
57. ENGINE CONTROL SYSTEM SECTION CONTENTS GA16DE PRECAUTIONS AND PREPARATION 3 Special Service Tools 3 Precaution M 3 Engine Fuel amp Emission Control System 4 Precautions for Engine Control Module Trouble Diagnosis of Engine 5 PRECAUTIONS EE 5 ENGINE AND EMISSION CONTROL OVERALL SYSTEM ie irc reete 7 Circuit 7 System 8 Engine Control Module Component Parts PEE 9 Vacuum Hose 11 ENGINE AND EMISSION BASIC CONTROLSYSTEM DESCRIPTION 12 System ated tci 12 Multiport Fuel Injection MFI System 13 Distributor Ignition DI System 16 Air Conditioning Cut 17 Fuel Cut Control at no load amp high engine SPCC e pM 17 EVAPORATIVE EMISSION SYSTEM 18 nnns 18 tnr 18 POSITIVE CRANKCASE VENTILATION 20 ee EET 20 21 BASIC SERVICE PROCEDURE 22 Fuel Pressure Release 22 Fuel Pressure
58. F make sure that mark is aligned with mark as shown in the figure SEF147N 56 2 Disconnect engine coolant temperature sensor har a GE ness connector and check resistance of sensor as temperature shown the figure 3 When the resistance of engine coolant temperature sensor is 0 26 to 0 39 make sure that mark is aligned with mark as shown in the figure e lf NG adjust by turning adjusting screw Adjusting screw tightening torque 1 0 2 0 N m 10 20 kg cm 8 7 17 4 in Ib 4 Stop engine Peers eam 5 Turn ignition switch to ON position and see COOLAN TEMP S in DATA MONITOR mode with CONSULT II 6 When engine coolant temperature is 20 to 30 68 to 86 F make sure that mark is aligned with mark as shown in the figure 50 5 When the resistance of engine coolant temperature sensor is 1 65 to 2 40 kQ make sure that mark Mark is aligned with mark as shown in the figure SEF148N e lf NG replace thermo element and perform the above inspection and adjustment again EC GA 55 TROUBLE DIAGNOSIS General Description SYSTEM Basic engine control system Symptom Matrix Chart SYMPTOM ENGINE STALL HESITATION SURGING FLAT SPOT SPARK KNOCK DETONATION LACK OF POWER POOR ACCELERATION HIGH IDLE LOW IDLE ROUGH IDLE HUNTING IDLING VIBRATION Reference page EXCESSIVE OIL CONSUMPTION gt HARD NO STA
59. GNOSTIC WORKSHEET as shown on the next page Before confirming the concern check and write down print out using CONSULT II the Diagnostic Trouble STEP Code DTC then erase the code The DTC can be used when duplicating the incident at STEP Ill amp IV Study the relationship between the cause specified by DTC and the symptom described by the customer The Symptom Matrix Chart will be useful Refer to Try to confirm the symptom and under what conditions the incident occurs The DIAGNOSTIC WORK SHEET is useful to verify the incident Connect CONSULT II to the vehicle in STEP Ill DATA MONITOR AUTO TRIG mode and check real time diagnosis results If the incident cannot be verified perform INCIDENT SIMULATION TESTS Refer to section If the malfunction code is detected skip STEP IV and perform STEP V Try to detect the Diagnostic Trouble Code DTC by driving in or performing the DTC CONFIRMATION PROCEDURE Check and read the DTC by using CONSULT II During the DTC verification be sure to connect CONSULT II to the vehicle in DATA MONITOR AUTO TRIG mode and check real time diagnosis results STEP IV If the incident cannot be verified perform INCIDENT SIMULATION TESTS Refer to section In case the DTC CONFIRMATION PROCEDURE is not available perform the OVERALL FUNCTION CHECK instead The DTC cannot be displayed by this check however this simplified check is an effec tive alternative The NG resu
60. I System INPUT OUTPUT SIGNAL LINE Camshaft position sensor Engine speed and piston position Mass air flow sensor Amount of intake air Engine coolant temperature sensor Engine coolant temperature Heated oxygen sensor Density of oxygen in exhaust gas Throttle position sensor Throttle position Neutral position switch Gear position Throttle valve idle position ECM Injector Vehicle speed sensor Vehicle speed Ignition switch Start signal Air conditioner switch Air conditioner operation Power steering oil pressure switch Power steering load signal Battery Battery voltage BASIC MULTIPORT FUEL INJECTION SYSTEM The amount of fuel injected from the fuel injector is determined by the ECM The ECM controls the length of time the valve remains open injection pulse duration The amount of fuel injected is a program value in the ECM memory The program value is preset by engine operating conditions These conditions are determined by input signals for engine speed and intake air from both the camshaft position sensor and the mass air flow sensor VARIOUS FUEL INJECTION INCREASE DECREASE COMPENSATION In addition the amount of fuel injected is compen sated to improve engine performance under vari ous operating conditions as listed below Fuel increase e During warm up When star
61. IGNITION SWITCH ON or START EC EGRC V 01 FUSE BLOCK Refer to EL POWER J B line for DTC BR mame Non detectable line for DTC R B 221 F104 BR BR 21 EGR VALVE AND CANISTER PURGE CONTROL SOLENOID VALVE a VSP ECM F101 REFER TO THE FOLLOWING FUSE BLOCK Junction Box J B TEREE fo ele ara 248 294 EC GA 101 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS EGR Valve and EVAP Canister Purge Control Solenoid Valve Cont d DIAGNOSTIC PROCEDURE INSPECTION START LA CHECK OVERALL FUNCTION 1 Jack up drive wheels 2 Start engine and warm it up suffi ciently 3 Perform diagnostic test mode Self diagnostic results Make sure that diagnostic trouble code No 55 is displayed Set the shift lever to 1st position Make sure that EGR valve spring moves up and down Use your fin ger under the following conditions At idle Spring does not move Revving engine from idle to 3 000 INSPECTION END Vacuum hose connected rpm to EGR valve Spring moves up and down NG E CHECK VACUUM SOURCES TO OK CHECK COMPONENTS EGR VALVE AND EVAP CANISTER EGR valve EGRC BPT 1 Disconnect vacuum hoses to EGR valve and EVAP canis valve and EVAP canister ter 2 Make sure th
62. ITION SEN SOR IACV AAC VALVE ADJ SET ENGINE SPEED AT THE SPECIFIED VALUE UNDER THE FOLLOWING CONDITIONS e ENGINE WARMED UP e NO LOAD FUEL PRESSURE RELEASE FUEL PUMP WILL STOP BY TOUCHING START DURING IDLING CRANK A FEW TIMES AFTER ENGINE STALLS When releasing fuel pressure from fuel line SELF DIAGNOSTIC MODE Freeze Frame Data and 1st Trip Freeze Frame Data Freeze frame data tom Description ne e Engine control component part control system has a trouble code e Fuel injection system status at the moment a malfunction is detected is displayed e One mode in the following is displayed FUEL SYS B1 MODE 2 Open loop due to detected system malfunction MODE 3 Open loop due to driving conditions power enrichment deceleration enrichment MODE 4 Closed loop using heated oxygen sensor s as feedback for fuel control MODE 5 Open loop has not yet satisfied condition to go to closed loop CAL LD VALUE e The calculated load value at the moment a malfunction is detected is displayed COOLANT TEMP C or F e The engine coolant temperature at the moment a malfunction is detected is displayed e Short term fuel trim at the moment a malfunction is detected is displayed e The short term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel schedule S FUEL TRIM B1 e Long term fuel trim at the moment a malfunction is det
63. LAY AND GROUND Check voltage between engine control mod ule relay connector terminals 2 5 and ground with CONSULT II or voltage tester Voltage Battery voltage Repair harness or connec tors Engine control module relay YEC327 DISCONNECT Wm DISCONNECT NG 7 y CHECK OUTPUT SIGNAL CIRCUIT Check the following HS TS ae Check harness continuity between ECM mao connector terminal and engine control M65 o module relay BECA terminal 1 e Harness for open or 275109 i x12 Continuity should exist short circuit between Engine control module If OK check harness for short circuit ECM and engine control relay connector module relay WR OK If NG repair harness or connectors 52 AEA Engine control module relay connector 5 W 1pq2 28 29 DISCONNECT DISCONNECT Engine control module relay connector ECM __ 0 sm 1 52 W G YEC330 EC GA 71 TROUBLE DIAGNOSIS FOR POWER SUPPLY oper Er O CONNECTOR 6 13 39 48 107 108 116 SEF461Q Main Power Supply and Ground Circuit Cont d CHECK ENGINE CONTROL MODULE RELAY 1 Apply 12V direct current between relay terminals 1
64. NJECTOR INJECTOR No 3 4 L B REFER TO THE FOLLOWING FUSE BLOCK B B B B Junction Box J B 515101121314 Ds YEC296 EC GA 110 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Injector Cont d COMPONENT DESCRIPTION The fuel injector is a small precise solenoid valve When the ECM supplies a ground to the injector circuit the coil in the injector is energized The energized coil pulls the needle valve back and allows fuel to flow through the injector into the intake manifold The amount of fuel injected depends upon the injection pulse duration Pulse duration is the length of time the injector remains open The ECM controls the injection pulse duration based on engine fuel needs C TOI me SEF596K ACTIVE TEST POWER BALANCE MONITOR CMPS RPM REF XXX rpm DIAGNOSTIC PROCEDURE INSPECTION START MAS AIR FL SEN XXXV IACV AAC V XXX CHECK OVERALL FUNCTION INSPECTION END 1 Start engine 2 Perform POWER BAL ANCE in ACTIVE TEST mode with CONSULT II 3 Make sure that each circuit produces a momentary engine speed drop OR E p Start engine At idle Listen to each injector oper ating sound Clicking noise should be heard Suitable tool NG SEF730L CHECK POWER SUPPLY NG
65. NT MANU TRIG If the malfunction is displayed as soon as DATA MONITOR is selected reset CONSULT II to MANU TRIG By select ing MANU TRIG you can monitor and store the data The data can be utilized for further diagnosis such as a compari son with the value for the normal operating condition EC GA 42 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION DATA MONITOR SET RECORDING CONDITION SET RECORDING CONDITION SELECTION FROM MENU AUTO TRIG AUTO TRIG ECM INPUT SIGNALS MANUTRIG MAIN SIGNALS TRIGGER POINT TRIGGER POINT SELECTION FROM MENU es 1 gt gt gt gt 0 20 40 60 80 100 0 20 40 60 80 100 Recording speed Recording speed MIN MAX MIN MAX lt lt lt lt Pee 164 32 16 8 4 2 FULL 164 132 16 8 4 2 FULL MODE BACK LIGHT COPY MODE BACK LIGHT COPY SETTING AUTO TRIG MANU TRIG A malfunction can be displayed A malfunction can not be displayed on DATA MONITOR screen on DATA MONITOR screen automatically if detected automatically even if detected SEF720X Generic Scan Tool GST DESCRIPTION Generic Scan Tool OBDII scan tool complying with ISO15031 4 has 9 different functions explained on the next page 1509141 is used as the protocol The name GST or Generic Scan Tool is used in this service manual Generic Scan Tool GST Sample SEF139P EC GA 43 ON BO
66. ON BATTERY Always use a 12 volt battery as power source Do not attempt to disconnect battery cables while engine is running ENGINE CONTROL MODULE PARTS HANDLING Handle mass air flow sensor carefully to avoid damage Do not disassemble mass air flow sensor Do not clean mass air flow sensor with any type of detergent Do not disassemble IACV AAC valve Even a slight leak in the air intake system can cause serious problems Do not shock or jar the camshaft position sensor Engine Fuel amp Emission Control System ECM WIRELESS EQUIPMENT Do not disassemble ECM Engine control When installing C B ham radio or a module mobile phone be sure to observe the Do not turn diagnosis mode selector following as it may adversely affect forcibly electronic control systems depending on f a battery terminal is disconnected the its installation location memory will return to the ECM value 1 Keep the antenna as far away as The ECM will now start to self control at possible from the ECM its initial value Engine operation can 2 Keep the antenna feeder line more than vary slightly when the terminal is 20 cm 7 9 in away from the harness of disconnected However this is not an electronic controls indication of a problem Do not replace Do not let them run parallel for a long parts because of a slight variation distance 3 Adjust the antenna and feeder line so that the standing wave ratio can
67. ORE STARTING 1 Check service records for any recent repairs that may indicate a related problem or the current need for sched uled maintenance 2 Open engine hood and check the follow ing e Harness connectors for faulty connec tions e Vacuum hoses for splits kinks or faulty connections e Wiring for faulty connections pinches or cuts 5 68 CONNECT CONSULT II TO THE VEHICLE Connect CONSULT II to the data link con nector for CONSULT II and select ENGINE from the menu Refer to DOES ENGINE START Yes light SEF284G CHECK IGNITION TIMING 1 Warm up engine sufficiently 2 Stop engine and disconnect throttle posi tion sensor harness connector 3 Start engine 4 Check ignition timing at idle using timing light Ignition timing 10 x 2 BTDC d Go to on next page EC GA 53 NG Go to B Adjust ignition timing by turning distributor TROUBLE DIAGNOSIS General Description Basic Inspection Cont d m CHECK IDLE ADJ SCREW INITIAL SET RPM Idle speed 625 50 rpm Adjust engine speed by turning idle adjusting screw Reconnect throttle position sensor harness connector adjusting screw CX IACV AAC valve Idle speed 27 7 69 NG CONNECT AS CHECK THROTTLE POSITION SENSOR Adjust output v
68. RT RESTART Z SLOW NO RETURN IDLE 2 OVERHEATS WATER TEMPERATURE HIGH gt Fuel Fuel pump circuit Fuel pressure regulator system e EXCESSIVE FUEL CONSUMPTION I BATTERY DEAD UNDER CHARGE Injector circuit Evaporative emission system Air Positive crankcase ventilation system IACV AAC valve circuit IACV FICD solenoid valve circuit Ignition EGR Main power supply and ground circuit Cooling Incorrect ignition timing adjustment Ignition circuit EGR valve amp EVAP canister purge control solenoid valve circuit EGR system Cooling fan circuit gt gt gt gt gt gt gt gt 0 gt 0 gt DI gt D CO ojo gt N Do IN A Air conditioner circuit HA section CONTROL MODULE Camshaft position sensor circuit Mass air flow sensor circuit Heated oxygen sensor circuit gt D n Engine coolant temperature sensor circuit Incorrect throttle position sensor adjustment Vehicle speed sensor circuit ECM Start signal circuit Neutral position switch circuit O O OIO Power steering oil pressure switch circuit O High Possibility Item Low Possibility Item EC GA 56 e continued on next TROUBLE DIAGNOSIS General De
69. S N ISNA gt lt fis no povio gt ANT 3181515 HOL93NNOO HOLIMS NOLLINOI ANIT VL VG YEC287 EC GA 7 ENGINE AND EMISSION CONTROL OVERALL SYSTEM System Diagram sApejeo 99141 Jejsiueo 4oinquisip 205095 uonisod yeysweo J0 S SUBJ joo yue lang 1ejsiueo ALA HOSA Josues juejooo 1 EU JT LiB 3 Buiooo L LLL uet O is xreds LL YOUMs peeds uonisod OV V AOVI uonisod ainssaid jan 0014 1524 Shean 1 4 al poq epoJu peo 1 Josues Ie SSEW YOUMS Jeuonipuoo 8 ENGINE AND EMISSION CONTROL OVERALL SYSTEM Engine Control Module Component Parts Location Fast idle cam Mass air flow sensor Throttle position sensor EGR valve amp EVAP can
70. SINYSHL 8i HOLIMS NVJ HOSN3S 3univu3dWaL se SNIDNA 62 wo FIL OWdSHL HOLIMS 0 HOSN3S 3unssaud 1 NOILISOd 31LLOHHL uiv Qv o Sv 61 Ee o z HOLON 1 HOLOW HOSN3S Nv gn N3OAXO LNA NITOOD 1 1291 TOH1NOO WIL 4HVdS 91 HOSN3S youms MODUIM 1291 01 Sy 55 Q 6 amp T bi HOSN3S ds NOILISOd youms T LHVHSWVO 10 YMS L AV T3H NVA i o MOOD bunuDi 01 lo L H3SN3QNOO 9 HH HT iz oy JosseJduioo 01 d JAYA GIONS10S 801 H1 durejpeeu oL QOlJ AOVI 401 Q 1518 601 Q HOLSISNVHL i H3MOd HOISIS3H 5 IB i L JMV 2 2 OL 901 ee GION310S H31SINVO dVA3 HOLIMS 8 i T 03395 Tans YON E ejqisny ei aiv ae 201 201 AH3LLVS N T 901 ZON gt NO AW144 HOLIMS NOLLINSI 4 5 93345 LOL 9 T L ON xj 2 m HOLO3fNI 1 S 4 91 2 4 75 3504 Ea lt gt lt gt gt lt gt lt a DJY 3snd lHVIS 10 NO HOLIM
71. accomplished by activated char coals in the EVAP canister The fuel vapor from the sealed fuel tank is routed into the EVAP canister when the engine is off The fuel vapor is then stored in the EVAP canister The EVAP canister retains the fuel vapor until the EVAP canister is purged by air When the engine is running the air is drawn through the bottom of the EVAP canister The fuel vapor will then be fed into the intake manifold When the engine runs at idle the EVAP canister purge control valve is closed Only a small amount of vapor flows into the intake manifold through the constant purge orifice As the engine speed increases and the throttle vacuum rises the EVAP canister purge control valve opens The vapor is sucked through both main purge and constant purge orifices Inspection EVAP CANISTER Check EVAP canister as follows 1 Blow air in port and ensure that there is no leakage 2 Apply vacuum to port Approximately 13 3 to 20 0 kPa 7 133 to 200 mbar 100 to 150 mmHg 3 94 to 5 91 inHg 3 Cover port b with hand 4 Blow air in port and ensure free flow out of port 8 EC GA 18 EVAPORATIVE EMISSION SYSTEM Inspection Cont d FUEL CHECK VALVE 20 Check valve operation eer 1 Blow air through connector on fuel tank side A considerable resistance should be felt and a portion of air Air flow should be directed toward the EVAP canister side vapor 2 Blow
72. air e When the engine is stopped a certain fuel ratio feedback correction factor value is indicated per cycle e This data also includes the data for the air fuel ratio learning control AIR COND RLY Indicates the air conditioner relay con ON OFF trol condition determined by ECM according to the input signal COOLING FAN e Indicates the control condition of the ON OFF cooling fans determined by ECM according to the input signal ON Operating OFF Stopped O FUEL PUMP RLY e Indicates the fuel pump relay control ON OFF condition determined by ECM accord ing to the input signals EGRC SOL V e Indicates the control condition of the ON OFF EGR valve amp EVAP canister purge control solenoid valve determined by ECM according to the input signal ON EGR system operation cut off OFF EGR system operation not cut off VOLTAGE e Voltage measured by the voltage V probe PULSE e Pulse width frequency or duty cycle e Only is displayed if item is unable msec or Hz or measured by the pulse probe to be measured e Figures with lt are temporary ones They are the same figures as an actual piece of data which was just previously measured EC GA 40 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT II Cont d ACTIVE TEST MODE TEST ITEM CONDITION JUDGEMENT CHECK ITEM REMEDY FUEL INJECTION Engine Return to the original trouble co
73. air through connector EVAP canister side EVAR canister side Air flow should be smoothly directed toward fuel tank side lt 3 If fuel check valve is suspected of not functioning properly in steps 1 and 2 above replace it FUEL TANK VACUUM RELIEF VALVE 1 Wipe clean valve housing 2 Suck air through the cap A slight resistance accompanied by valve clicks indicates that valve A is in good mechanical condition Note also that by further sucking air the resis tance should disappear with valve clicks 3 Blow air on fuel tank side and ensure that continuity of air passage exists through valve B 4 If valve is clogged or if no resistance is felt replace as an assembly SEF427N EC GA 19 POSITIVE CRANKCASE VENTILATION Description This system returns blow by gas to the intake manifold collector The positive crankcase ventilation PCV valve is provided to conduct crankcase blow by gas to the intake manifold During partial throttle operation of the engine the intake manifold sucks the blow by gas through the PCV valve Normally the capacity of the valve is sufficient to handle any blow by and a small amount of ventilat ing air The ventilating air is then drawn from the air duct into the crankcase In this process the air passes through the hose connecting air inlet tubes to rocker cover Under full throttle condition the manifold vacuum is insufficient to draw the blow by flow th
74. al When accelerating Poor acceleration Fail safe system activating condition when ECM is malfunctioning The computing function of the ECM was judged to be malfunctioning When the fail safe system activates i e if the ECM detects a malfunction condition in the CPU of ECM the MALFUNCTION INDICATOR on the instrument panel lights to warn the driver Engine control with fail safe system operates when ECM is malfunctioning When the fail safe system is operating fuel injection ignition timing fuel pump operation IACV AAC valve operation and cooling fan operation are controlled under certain limita tions Operation Engine speed Engine speed will not rise more than 3 000 rpm Fuel injection Simultaneous multiport fuel injection system Ignition timing Ignition timing is fixed at the preset valve Fuel pump Fuel pump relay is when engine is running and OFF when engine stalls IACV AAC valve Full open Cooling fans Cooling fan relay ON when ovs running and OFF when engine EC GA 52 TROUBLE DIAGNOSIS General Description Y c SEF142I Basic Inspection Precaution Perform Basic Inspection without electrical or mechanical loads applied e Headlamp switch is off Air conditioner switch is off e e Rear window defogger switch is off e Steering wheel is in the straight ahead position etc Data link connector 4 CONSULT II Il saTz03 BEF
75. al order 0 2 9 38 QC 0 30 0 39 kg m 26 34 in Ib D Injector Upper W insulator NEF547 y 3 Engine a PO E Sead Ho LE e e ce a A Tighten in numerical order i AEC793 Fuel Pressure Regulator Check 1 Stop engine and disconnect fuel pressure regulator vacuum hose from intake manifold 2 Plug intake manifold with a rubber cap 3 Connect variable vacuum source to fuel pressure regulator 4 Start engine and read indication of fuel pressure gauge as vacuum is changed Fuel pressure should decrease as vacuum increases If results are unsatisfactory replace fuel pressure regulator Injector Removal and Installation 1 Release fuel pressure to zero 2 Remove injector tube assembly with injectors from intake manifold 3 Remove injectors from injector tube assembly e Push injector tail piece e Do not pull on the connector Install injectors Clean exterior of injector tail piece Use new O rings e Face metal plate of upper insulator to injector CAUTION After properly connecting injectors to fuel tube assembly check connections for fuel leakage 5 Assemble injectors to injector tube assembly 6 Install injector tube assembly to intake manifold ees 7 Tighten fuel tube bolts to 9 3 10 8 N m 0 95 1 10 kg m 82 96 in Ib as shown in the figure Then tighten the bolts to 20 6 26 5 N m 2 10 2 7
76. amp 2 connector terminals 2 and body ground Continuity should exist If OK check harness for short cir Repair harness con nectors Cooling fan motor 1 amp 2 connectors fa Cooling fan ECM relay connector 9 Q3 1542125 LG R CHECK OUTPUT SIGNAL CIRCUIT 1 Disconnect ECM harness connec tor 2 Check harness continuity between ECM connector terminal 9 and cooling fan relay connector terminal Check the following e Harness connectors e Harness for open or short circuit between ECM and cooling fan YEC347 Continuity should exist If NG repair harness or If OK check harness for short cir connectors cuit CHECK COMPONENT Replace cooling fan Cooling fan relay relay Refer to COMPONENT INSPEC TION on next page CHECK COMPONENTS Cooling fan motors Refer to COMPONENT INSPEC TION on next page Disconnect and reconnect harness Replace cooling fan motors connectors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage and check the connection of ECM har ness connector Reconnect ECM har ness connector and retest INSPECTION END EC GA 127 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Cooling fan relay SEF511P DISCONNECT TS Cooling fan motor connector
77. and its circuit See page ______ _____ Check injector and its circuit See page Clean or replace if necessary Check engine coolant temperature sensor and its circuit See page EC GA 81 I Check ECM function by substituting another known good ECM ECM may be the cause of a problem but this is rarely the case EC GA 31 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION Condition Engine stopped Ignition switch in ON posi tion Engine 0 running us Malfunction Indicator Ml 1 malfunction indicator will light when the ignition switch N is turned ON without the engine running This is a bulb check e malfunction indicator does not light up refer to EL sec tion WARNING LAMPS AND CHIME or see 2 When the engine is started the malfunction indicator should go off SAT652J Diagnostic Diagnostic Test Mode I Test Mode BULB CHECK SELF DIAGNOSTIC RESULTS HEATED OXYGEN SENSOR MONITOR MALFUNCTION WARNING EC GA 32 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION Malfunction Indicator MI Cont d HOW TO SWITCH DIAGNOSTIC TEST MODES Turn ignition switch to position Do not start engine Pp Diagnostic Test Mode BULB CHECK IGN 000000000000 Data link connector for CONSULT II Connect CHK and IGN terminals
78. at vacuum exists under Refer to COMPONENT the following conditions INSPECTION See At idle page Vacuum hose connected Vacuum should not exist NG to EVAP canister MEC296BC Revving engine from idle to 3 000 rpm Vacuum should exist Replace malfunctioning component s HS NG Po ECM O CONNECTOR I CHECK CONTROL FUNCTION CHECK VACUUM Check voltage between ECM connec HOSE tor terminal and ground under the Check vacuum hose for following conditions clogging cracks or Voltage improper connection At idle Approximately 0V 25 Engine speed is 2 000 rpm Battery voltage C Crack i Clogging a 3 Improper connection SEF816F EC GA 102 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS EGR Valve and EVAP Canister Purge Control DISCONNECT EGR valve and TS EVAP canister m purge control 2 F45 Solenoid valve connector BR eo SEF488Q DISCONNECT DISCONNECT SS TS amp D valve and EVAP canister purge control EC valve connector c 2 SEF489Q Solenoid Valve Cont d CHECK POWER SUPPLY NG 1 Stop engine 2 Disconnect EGR valve amp EVAP canister purge control solenoid valve harness connector 3 Turn ignition switch to ON posi tion 4 Check voltage between EGR valve amp EVAP canister purge control sole noid valve conn
79. cleaner 3 connector to 3 way con ter EGR valve amp EVAP canister nector EGR valve amp EVAP canister purge control solenoid valve to 3 way connector EC GA 11 purge control solenoid valve to throttle body ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION Camshaft position sensor Mass air flow sensor __ Engine coolant tempera ture sensor Ignition switch c Throttle position sensor gt Neutral position switch gt Air conditioner switch __ Battery voltage gt Power steering oil pres sure switch Vehicle speed sensor Heated oxygen sensor Electrical load e Rear window defogger switch gt e Lighting switch e Blower fan switch ECM System Chart Fuel injection amp mixture ratio control Injectors Distributor ignition system IACV AAC valve and IACV FICD solenoid valve Idle air control system Fuel pump control Fuel pump relay Heated oxygen sensor Malfunction indicator monitor amp On board diag On the instrument panel nostic system Cooling fan control Cooling fan relay Air conditioner cut control during acceleration EGR amp EVAP canister EGR valve amp EVAP canister purge control purge control solenoid valve Air conditioner relays EC GA 12 ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION Multiport Fuel Injection MF
80. connector Reconnect ECM harness connector and retest SEF471Q INSPECTION END EC GA 88 TROUBLE DIAGNOSIS FOR DTC 21 Ignition coil harness connector xi AEG Ignition coil harness connector Ul Ju A Distributor head YEC334 terminals Power transistor 2 TS wr PN 2 NEF382 Resistor NEF383 Ignition Signal Cont d COMPONENT INSPECTION Ignition coil 1 Disconnect ignition coil harness connector 2 Check resistance as shown in the figure Resistance at 25 C 77 Approximately 1 Q Terminal 7 7 secondary terminal distribu tor head Secondary Approximately 10 kQ If NG replace ignition coil 3 For checking secondary coil remove distributor cap 4 Check resistance between ignition coil harness connector terminal and the secondary terminal on the distributor head If NG replace distributor Power transistor 1 Disconnect power transistor harness connector 2 Check power transistor resistance between terminals and 8 Terminals Not 02 OK ene 00 NG If NG replace distributor Result Resistor 1 Disconnect resistor harness connector 2 Check resistance between resistor terminals 1 2 Resistance Approximately 2 2 at 25 C 77 F If NG replace resistor E
81. ected into each cylinder during each engine cycle according to the firing order This system is used when the engine is running Simultaneous multiport fuel injection system Fuel is injected simultaneously into all four cylinders twice each engine cycle In other words pulse signals of the same width are simultaneously transmitted from the ECM The four injectors will then receive the signals twice for each engine cycle This system is used when the engine is being started and or if the fail safe system CPU is operating FUEL SHUT OFF Fuel to each cylinder is cut off during deceleration or operation of the engine and the vehicle at excessively high speeds EC GA 15 ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION Distributor Ignition DI System INPUT OUTPUT SIGNAL LINE Engine speed and piston position Camshaft position sensor Amount of intake air Mass air flow sensor Engine coolant temperature Engine coolant temperature sensor m Throttle position Throttle position sensor P Throttle valve idle position Vehicle speed sensor i transistor Vehicl Vehicle speed sensor ehicle speed Start signal Ignition switch Neutral position switch Gear position Battery voltage Battery Tp SYSTEM DESCRIPTION 4 The ignition timing is controlled by the ECM to maintain the best air fuel ratio for every operati
82. ected is displayed e The long term fuel trim indicates much more gradual feedback compensation to the base fuel schedule than short term fuel trim L FUEL TRIM B1 ENGINE SPEED rom VHCL SPEED km h or mph ABSOL PRESS e The absolute pressure at the moment a manlfunction is detected is displayed kPa kg cm or psi B FUEL SCHDL e The base fuel schedule at the moment a malfunction is detected is displayed msec e The engine speed at the moment a malfunction is detected is displayed e The vehicle speed at the moment a malfunction is detected is displayed INT A TEMP SE e The intake air temperature at the moment a malfunction is detected is desplayed C The items are the same as those of 1st trip freeze frame data EC GA 38 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT II Cont d SELF DIAGNOSTIC MODE Regarding items detected in SELF DIAG RESULTS mode refer to Diagnostic Trouble Code DTC Chart Refer to DATA MONITOR MODE Monitored item Main Unit signals Description Remarks CMPS RPM e Indicates the engine speed computed e Accuracy becomes poor if engine REF rpm from the REF signal 180 signal of speed drops below the idle rpm O the camshaft position sensor e f the signal is interrupted while the engine is running an abnormal value may be indicated MAS AIR FL SE V e The signal voltage of the mass air e When the engine is stopped a certain
83. ector terminal 2 and ground Voltage Battery voltage OK CHECK OUTPUT SIGNAL CIRCUIT 1 Turn ignition switch to LOCK posi tion 2 Disconnect ECM harness connec tor 3 Check harness continuity between ECM connector terminal and EGR valve amp EVAP canister purge control solenoid valve connector terminal Continuity should exist If OK check harness for short cir cuit CHECK COMPONENT NG EGR valve amp EVAP canister purge control solenoid valve Refer to COMPONENT INSPEC TION on next page connectors the circuit Then retest Disconnect and reconnect harness Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness con nector Reconnect ECM harness con nector and retest INSPECTION END EC GA 103 Check the following e Harness connectors 5o e 10A fuse e Harness for open or short circuit between EGR valve amp EVAP canister purge control solenoid valve and fuse If NG replace 10A fuse or repair harness or con nectors Repair harness or con nectors Replace EGR valve amp EVAP canister purge control solenoid valve TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS EGR Valve and EVAP Canister Purge Control Solenoid Valve Cont d COMPONENT INSPECTION EGR valve Apply vacuum to EGR vacuum port with a hand vacuum pump EGR valve spring should lift If NG
84. ed e Engine coolant temperature sensor DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE 1 Turn ignition switch to ON position 2 Select DATA MONITOR mode with CONSULT II 3 Wait at least 5 seconds QR 1 ignition switch to ON position and wait at least 5 seconds 2 Turn ignition switch to LOCK position wait at least 5 seconds and then turn to ON position 3 Perform Diagnostic Test Mode Self diagnostic results with ECM EC GA 81 TROUBLE DIAGNOSIS FOR DTC 13 Engine Coolant Temperature Sensor ECTS EC ECTS 01 SENSOR ENGINE COOLANT TEMPERATURE Detectable line for mam Non detectable line for DTC GI GY YEC416 EC GA 82 TROUBLE DIAGNOSIS FOR DTC 13 Engine coolant temperature sensor harness connector 5 67 DISCONNECT temperature sensor connector L OR SEF518Q Ss DISCONNECT 5 Engine coolant temperature gt lt sensor connector amp 187 SEF519Q Engine Coolant Temperature Sensor ECTS Cont d DIAGNOSTIC PROCEDURE INSPECTION START CHECK POWER SUPPLY 1 Turn ignition switch to LOCK posi tion 2 Disconnect engine coolant tempera ture sensor harness connector 3 Turn ignition switch to ON posi tion 4 Check voltage between engine cool ant temperature sensor connector terminal 2 and ground
85. emental air bag modules for a frontal collision the supplemental side air bag used along with the seat belt help to reduce the risk or severity of injury to the driver and front passenger in a side collision The supplemental side air bag consists of air bag modules located in the outer side of front seats satellite sensor diagnosis sensor unit one of components of supplemental air bags for a frontal collision wiring harness warning lamp one of components of supplemental air bags for a frontal collision Information necessary to service the system safely is included in the RS section of this Service Manual WARNING e Toavoid rendering the SRS inoperative which could increase the risk of personal injury or death in the event of a collision which would result in air bag inflation all maintenance must be per formed by an authorized NISSAN dealer e maintenance including incorrect removal and installation of the SRS can lead to per sonal injury caused by unintentional activation of the system e Do not use electrical test equipment on any circuit related to the SRS unless instructed in this Service Manual SRS wiring harnesses except SEAT BELT PRE TENSIONER connector can be identified with yellow harness connector and with yellow harness protector or yellow insula tion tape before the harness connectors Do not use electrical test equipment on any circuit related to the SRS EC GA 3 PRECAUTIONS AND PREPARATI
86. eral Description Major Sensor Reference Graph in Data Monitor Mode Cont d 00 06 04 67 x0 1V THRTL POS SEN 09 25 00 06 04 67 x0 01V 2 SEN 09 25 00 06 04 67 msec INJ PULSE 09 25 ip oN 3 THRTL POS SEN should increase while depressing the accelerator pedal and should decrease while releasing it 256 192 128 02 SEN may increase immediately after depressing the accelerator pedal and may decrease after releasing the pedal 64 20 15 lt e INJ PULSE should increase when depressing the accelerator pedal and should decrease when the pedal is released SEF259QA EC GA 61 TROUBLE DIAGNOSIS General Description ECM Terminals and Reference Value PREPARATION 1 ECM is located behind the center console panel For this inspection remove the center console under cover 2 Remove ECM harness protector ECM harness protector MEF140D 3 When checking ECM output voltages perform all voltage measurements with the connectors connected Extend tester probe as shown to perform tests easily ECM HARNESS CONNECTOR TERMINAL LAYOUT 40102 103104405 06107 08 112131415161 7 15 16 17 1819201211221 31132133134 3536 37 38 39 p 109110 11 12 73114115116 8 9119 1112 13 14 23 24 25 26 27 28 29 30 140 41 42143
87. f e 1121314151617 15116 17 18 19 20 21 22 8 9110 11 12 13 14 may H S YEC288 EC GA 69 TROUBLE DIAGNOSIS FOR POWER SUPPLY Main Power Supply and Ground Circuit Cont d CONNECT 54 INSPECTION START Ecm o coNNECTOR 44 Start engine CHECK POWER SUPPLY I Is engine running 1 Tum ignition switch to ON B R 9 n position Yes 2 Check voltage between ECM connector terminal and ground with CON SULT II or tester Voltage Battery voltage B If NG check the following 40 fusible link CONNECT e Condition and operation of LEA ignition switch Harness connectors ECM O CONNECTOR 152 4 Harness connectors YEC325 H BE 6 W L e Harness for open or short circuit between ECM and ignition switch If NG replace 40A fusible link repair ignition switch har D e D ness or connectors P EP 0 Go to CHECK GROUND ECM CIRCUIT 38 47 109 F101 oo _ CHECK POWER SUPPLY II NG Check the following 1 Stop engine Harness connectors 2 Check voltage between ECM connec F104 60 tor terminal and ground with e Harness connectors M70 1 CONSULT II or tester 7 YEC326 Voltage Battery voltage 10A fuse Harness for open or short OK circuit be
88. g Idle Mixture Ratio Adjustment Cont d Check idle speed Models with daytime light system 800 50 rpm Models without daytime light system 700 50 rpm Check IACV AAC valve and replace if necessary Check IACV AAC valve harness and repair if neces sary Check ECM function by substituting another known good ECM ECM may be the cause of a problem but this is rarely the case See F C in Data monitor mode 2 Run engine at about 2 000 rpm for about 2 minutes under no load 3 Maintaining engine at 2 000 rpm under no load engine is warmed up sufficiently check that the monitor fluctuates between LEAN and RICH more than 5 times dur ing 10 seconds 1 time RICH LEAN RICH 2 times RICH LEAN RICH RICH OR LEAN Set Heated oxygen sensor monitor in diagnostic test mode ll See page 2 Run engine at about 2 000 rpm for about 2 minutes under no load 3 Maintaining engine at 2 000 rpm under no load check that the malfunction indicator on the instrument panel goes ON and OFF more than 5 times during 10 seconds nd END EC GA 28 BASIC SERVICE PROCEDURE Idle Speed Ignition Timing Idle Mixture Ratio Adjustment Cont d sensor connecter F34 DISCONNECT Eo Check heated oxygen sensor harness 1 Turn off engine and disconnect battery ground cable
89. g fuel line release fuel pressure from fuel line to eliminate danger 1 Turn ignition switch to the ON position 2 Perform FUEL PRESSURE RELEASE in WORK SUPPORT mode with CONSULT II 3 Start engine 4 After engine stalls crank it two or three times to release all fuel pressure 5 Turn ignition switch to the LOCK position OR 120 1 Remove fuse for fuel pump Jey 2 Start engine 3 After engine stalls crank it two or three times to release all fuel pressure 4 Turn ignition switch off and reconnect fuel pump fuse Fuel Pressure Check When reconnecting fuel line always use new clamps Make sure that clamp screw does not contact adjacent parts Use a torque driver to tighten clamps Use Pressure Gauge to check fuel pressure Do not perform fuel pressure check with system operat ing Fuel pressure gauge may indicate false readings Release fuel pressure to zero Disconnect fuel hose between fuel filter and fuel tube engine side Install pressure gauge between fuel filter and fuel tube Start engine and check for fuel leakage Read the indication of fuel pressure gauge At idling With vacuum hose connected Approximately 245 kPa 2 45 bar 2 5 kg cm 36 psi With vacuum hose disconnected Approximately 294 kPa 2 94 bar 3 0 kg cm 43 psi If results are unsatisfactory perform Fuel Pressure Regula tor Check EC GA 22 BASIC SERVICE PROCEDURE Vacuum Fuel pressure Loosen in numeric
90. h harness connec tor e Harness for open or Check harness continuity between short circuit between ECM connector terminal and ECM and ignition ignition switch connector terminal switch 5 If repair harness or Continuity should exist connectors If OK check harness for short cir cuit Disconnect and reconnect harness connectors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness con nector Reconnect ECM harness con nector and retest INSPECTION END EC GA 99 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS EGR Valve and EVAP Canister Purge Control Solenoid Valve SYSTEM DESCRIPTION Camshaft position sensor Engine speed Engine coolant temperature sensor Mass air flow sensor Engine coolant temperature EGR valve amp Amount of intake air EVAP canister purge control solenoid valve ECM Throttle position sensor Throttle position Start signal Ignition switch Vehicle speed sensor Vehicle speed This system cuts and controls the port vacuum applied to the EGR valve and EVAP canister purge control solenoid valve to suit engine operating con ditions This cut and control operation is accomplished through the ECM When the ECM detects any of the following conditions current flows through the solenoid valve in the EGR valve and EVAP canis ter
91. ighting switch is ON Engine is running Rear window defogger is not operating Lighting switch is OFF 33 R Electrical load switch OV 34 B Y Start signal Ignition switch ON Ignition switch START EC GA 65 Approximately BATTERY VOLTAGE 11 14V TROUBLE DIAGNOSIS General Description ECM Terminals and Reference Value Cont d TERMINAL WIRE NO COLOR ITEM CONDITION DATA Ignition switch ON OV Neutral position 35 G OR Neutral position switch Ignition switch ON Approximately 5V L Except the above gear position 37 P L Throttle position sensor Ignition switch Approximately 5V power supply 38 rs BATTERY VOLTAGE 47 W R Power supply for Ignition switch 11 14V 39 Engine control module Engine is running B Engine ground 48 ground L Idle speed Engine is running _ Both air conditioner switch and blower fan APProximately OV 41 G Y Air conditioner switch switch are ON Engine is running BATTERY VOLTAGE Air conditioner switch is OFF 11 14V Engine is running OV i L Steering wheel is being turned 43 PU W Power steering oil pres 0 0 sure switch Engine is running Approximately 5V L S
92. inal 2 and body ground Continuity should exist DISCONNECT DISCONNECT 4 If OK check harness for short cir HS TS cuit ECM CONNECTOR ded F28 position Switch connector CHECK INPUT SIGNAL CIRCUIT G OR 1 Disconnect ECM harness connec tor Check harness continuity between ECM connector terminal 5 and neutral position switch connector terminal 1 Continuity should exist If OK check harness for short cir Repair harness con nectors gt SEF503Q CHECK COMPONENT Neutral position switch Refer to MT section Replace neutral position switch Disconnect and reconnect harness connectors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage and check the connection of ECM har ness connector Reconnect ECM har ness connector and retest INSPECTION END EC GA 134 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Electrical Load Signal EC LOAD 01 ECM H FAN LG B Detectable line for DTC Non detectable line for DTC With air conditiner Without air conditioner a LG B 27 B B CONTROL PANEL 4 L 22 m 189 112151315 617 fo ESpermeroporp s ros properans na pre Le 9 10 11 12 13 14 YEC303 EC GA 135 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Electrical Load Signal Cont d EC LOAD 02 PESE mm
93. ine and compare tachometer indication with the CONSULT II SPECIFICATION Almost the same speed as the CON SULT II value value e Engine After warming up Idle 12 1 8V MAS AIR FL SE e Shift lever No load 2 000 1 7 2 3 COOLAN TEMP S e Engine After warming up More than 70 C 158 F 2 SEN M R F C MNT Engine After warming up Maintaining engine speed at 2 000 rpm 0 0 3V e 0 6 1 0V LEAN lt gt RICH Changes more than 5 times during 10 seconds VHCL SPEED SE Turn drive wheels and compare speedometer indication with the CON Almost the same speed as SULT II value the CONSULT II value BATTERY VOLT e Ignition switch ON Engine stopped 11 14V iti itch Throttle valve fully closed 0 35 0 65V THRTL POS SEN Ignition switch ON Engine stopped Throttle valve fully opened Approx 4 0V START SIGNAL e Ignition switch ON START gt OFF ON OFF a 75 on CLSD THL POSI Ignition switch ON Engine stopped Throttle valve OFF Slightly open A C switch OFF OFF e Engine After warming up idle the AIR COND SIG engine A C switch ON ON Compressor operates Shift lever P or N ON P N POSI SW e Ignition switch ON Except above OFF Steering wheel in neutral position OFF PW ST SIGNAL e 1 After warming up idle the forward direction The steering wheel is turned ON Rear window defogger
94. isplayed If MANU TRIG STOP is touched on the screen during Recording Data xx REAL TIME DIAG screen is also displayed TRIGGER POINT The recording time after the malfunction detection and the TEREE recording speed can be changed by TRIGGER POINT and 0 20 40 60 80 100 Recording Speed Refer to CONSULT II OPERATION MANUAL 888 2 MANU TRIG Manual trigger 64 132 116 8 4 2 FULL SEF707X e DTC 1st trip DTC and malfunction item will not be displayed automatically on CONSULT II screen even though a mal function is detected by ECM DATA MONITOR can be performed continuously even though a malfunction is detected Use these triggers as follows ili AUTO TRIG While trying to detect the DTC 1st trip DTC by performing the DTC Confirmation Procedure be sure to select DATA MONITOR AUTO TRIG mode You can confirm the mal function at the moment it is detected While narrowing down the possible causes CONSULT II should be set in DATA MONITOR AUTO TRIG mode especially in case the incident is intermittent When you are inspecting the circuit by gently shaking or twisting the suspicious connectors components ness in the DTC Confirmation Procedure the moment a malfunction is found the DTC 1st trip DTC will be displayed Refer to GI section Incident Simulation Tests in HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDE
95. ister purge control solenoid valve EVAP canister Power steering oil EGRC BPT valve EGR valve Fuel filter Engine coolant temperature sensor IACV FICD solenoid valve Fuel pressure regulator IACV AAC valve Distributor with built in camshaft position sensor power transistor and ignition coil Heated oxygen sensor GST p Mass air flow sensor EGR valve amp EVAP canister Ke IACV FICD solenoid valve Tore i C bn purge control solenoid valve ul Injector E SN 1 IACV AAC valve Throttle position sensor Engine coolant temperature sensor EC GA 9 NEF365 ENGINE AND EMISSION CONTROL OVERALL SYSTEM Engine Control Module Component Parts Location Cont d Behind the center console ECM harness connector SEF452Q EC GA 10 ENGINE AND EMISSION CONTROL OVERALL SYSTEM Vacuum Hose Drawing Fuel pressure regulator EGR valve 3 way connector Pe canister L ie D To air cleaner C EGR valve amp EVAP canister purge control solenoid valve Throttle body EGRC BPT valve NEF366 D Fuel pressure regulator to intake EGRC BPT valve to 3 way con 7 EGR valve amp EVAP canister manifold nector purge control solenoid valve to 2 EGR valve to 3 way connector 3 way connector to EVAP canis air
96. kfire Exhaust backfire Others Startability O Idling Symptoms Surge Lack of power Driveability Engine stall Incident occurrence At the time of start While accelerating Just after stopping Just after delivery In the morning At night While idling While decelerating While loading Recently In the daytime Frequency Weather conditions All the time Under Not affected Sometimes certain conditions Temperature Fine Hot Raining Warm Others Humid Snowing Cool Cold Engine conditions Cold Engine speed 0 During warm up After warm up a ee lg Il lI 2 000 4 000 6 000 8 000 rpm Road conditions Driving conditions In suburbs In town Not affected At starting O While accelerating O While decelerating O While idling Highway Off road up down At racing While cruising While turning RH LH Vehicle speed 1 0 10 20 30 40 70 80 90 100 mph Malfunction indicator O Turned
97. l pump relay makes the oper e Harness and connector RELAY e Tur the fuel pump relay TON ating sound Fuel pump relay and OFF using CONSULT II and listen to operating sound e Ignition switch ON EGRC SOLENOID VALVE SELF LEARNING CONT Turn solenoid valve ON and OFF with the CONSULT II and listen to operating sound Solenoid valve makes an operat ing sound Harness and connector Solenoid valve In this test the coefficient of self learning control mixture ratio returns to the original coefficient by touching CLEAR on the screen EC GA 41 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT II Cont d L UNTER REAL TIME DIAGNOSIS IN DATA MONITOR MODE RECORDING VEHICLE DATA ENG SPEED CONSULT II has two kinds of triggers and they can be selected MAS A F SE B1 XXXV by touching SETTING in DATA MONITOR mode Et poate 1 AUTO TRIG Automatic trigger MIEL PEED ce We Lan e The malfunction will be identified the CONSULT II screen in real time In other words DTC 1st trip DTC and malfunction item will be displayed if the malfunction is detected by ECM At the moment a malfunction is detected by ECM MONI ed TOR in DATA MONITOR screen is changed to Record ing Data xx as shown at left and the data after the mal function detection is recorded Then when the percentage AUTO TRIG reached 100 REAL TIME DIAG screen is d
98. lt of the OVERALL FUNCTION CHECK is the same as the DTC detection Take the appropriate action based on the results of STEP I through IV enn If the malfunction code is indicated proceed to TROUBLE DIAGNOSIS FOR DTC Refer to EC GA 50 If the normal code is indicated proceed to the BASIC INSPECTION Refer to EC GA 53 Then perform inspections according to the Symptom Matrix Chart Refer to Identify where to begin diagnosis based on the relationship study between symptom and possible causes Inspect the system for mechanical binding loose connectors or wiring damage using tracing Harness Lay outs Gently shake the related connectors components or wiring harness with CONSULT II set in DATA MONI TOR AUTO TRIG mode STEP VI Check the voltage of the related ECM terminals or monitor the output data from the related sensors with CONSULT II Refer to The DIAGNOSTIC PROCEDURE in EC section contains a description based on open circuit inspection A short circuit inspection is also required for the circuit check in the DIAGNOSTIC PROCEDURE For details refer to GI section HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT Circuit Inspection Repair or replace the malfunction parts Once you have repaired the circuit or replaced a component you need to run the engine in the same condi tions and circumstances which resulted in the customer s initial complaint Perform the DTC CONFIRMATION PROCEDURE and confirm
99. m Detectable line for DTC BLOCK J B Non detectable line for DTC Refer to With XENON headlamp or daytime light system EL POWER Except CONTROL UNIT B96 COMBINATION R SWITCH LIGHTING IL J SWITCH F103 R E111 x1 With XENON headlamp R W Except XENON 2 With daytime light system 1 Without daytime light system 2 e With daytime light sytem 2 Without daytime light system 1 RY gt DIODE relay LH Pk Rt TRADES 5 5 52 470 EL H LAMP T R ECM F101 REFER TO THE FOLLOWING 21 5 6 7 FUSE BLOCK 10 11 12013 1415 16 Junction J B 3141516 gt F109 23 o trop atone DM 5 8 9110 11 12 13 14 This connector is not shown in HARNESS LAYOUT of EL section YEC304 EC GA 136 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Electrical Load Signal Cont d DIAGNOSTIC PROCEDURE INSPECTION START CHECK OVERALL FUNCTION I 1 Turn ignition switch to ON posi tion 2 Check LOAD SIGNAL in DATA MONITOR mode with CONSUL T II Rear window defogger switch is ON Rear window defogger switch is OFF OFF Ci 2 Check voltage between ECM connector terminal 8 and ground under the following conditions Voltage Rear window defogger s
100. m in 1st position 44 14V Raise the vehicle Ignition switch ON L For 5 seconds after turning ignition switch ON Approximately 0 9V Engine is running 106 B P Fuel pump relay Ignition switch ON B BATTERY VOLTAGE Following a 5 seconds delay after turning 11 14V ignition switch ON and thereafter Engine is ground i B Injector ground Engine ground Idle speed EC GA 67 TROUBLE DIAGNOSIS General Description ECM Terminals and Reference Value Cont d TERMINAL WIRE ITEM CONDITION DATA NO COLOR BATTERY VOLTAGE 11 14V V D i Engine is running L Idle speed 1 HH 02 2 113 SB IACV AAC valve NEF585 1 10V V P E i Engine is running Engine speed is 2 000 rpm i ms 585 Engine is running 116 B Injector ground Engine ground L Idle speed EC GA 68 TROUBLE DIAGNOSIS FOR POWER SUPPLY Main Power Supply and Ground Circuit BATTERY 10A Refer to EL POWER BATTERY EC MAIN 01 Refer to EL POWER IGNITION SWITCH ENGINE CONTROL MODULE i RELAY R E125 R W R E65 5 F70 GA M52 T SSOFF ECMP CRTN E Detectable line for DTC Non detectable line for DTC i
101. mpletely released Approximately 0 5 0 5 4 Partially released Completely depressed Approximately 4 Engine is warmed up sufficiently EC GA 142
102. n off engine and disconnect throttle position sensor harness connector 2 Start engine Race engine 2 000 3 000 rpm 2 or 3 times under no load and then run engine at idle speed Check ignition timing with a timing light Ignition timing 10 2 BTDC Adjust ignition timing to the specified value by turning distributor after loosening bolts which secure distributor Ignition timing 10 2 BTDC 1 Turn off engine and disconnect throttle position sensor harness connector 2 Start engine lt 26 BASIC SERVICE PROCEDURE Idle Speed Ignition Timing Idle Mixture Ratio Adjustment Cont d Check base idle speed 625450 rpm Race engine 2 000 3 000 rpm 2 or 3 times under no load and run engine at idle speed Adjust idle speed by turning idle speed adjusting screw Base idle speed 625450 rpm 1 Turn off engine and connect throttle position sensor harness connec tor 2 Start engine Start engine Race engine 2 000 3 000 rpm 2 or 3 times under no load and run engine at idle speed EC GA 27 BASIC SERVICE PROCEDURE CMPS RPM REF XXX rpm RICH 02 MNTR PEF054P Data link connector for CONSULT Connect and IGN terminals with a suitable harness N 5 652 Idle Speed Ignition Timin
103. ndition e Change the amount of fuel injection using CONSULT II If trouble symptom disappears see CHECK ITEM Harness and connector Fuel injectors Heated oxygen sensor IACV AAC N OPENING ENG COOLANT TEMP Engine After warming up idle the engine Change the IACV AAC valve opening percent using CON SULT II Engine Return to the original trouble condition e Change the engine coolant temperature indication using CONSULTI Engine speed changes according to the opening percent If trouble symptom disappears see CHECK ITEM Harness and connector IACV AAC valve Harness and connector Engine coolant temperature sensor Fuel injectors e Engine Return to the original trouble If trouble symptom disappears IGNITION TIMING e Timing light Set e Adjust initial ignition timing Siar ree see CHECK ITEM e Retard the ignition timing using CONSULT II e Engine After warming up idle e Harness and connector the engine e Compression POWER switch OFF Engine runs rough or dies e Injectors BALANCE e Shift lever e Power transistor e Cut off each injector signal one e Spark plugs at a time using CONSULT II e Ignition coils e Ignition switch ON e Harness and connector COOLING FAN e Turn the cooling fan ON and Cooling fan moves and stops e Cooling fan motor OFF using CONSULT II e Cooling fan relay e Ignition switch ON Engine FUEL PUMP stopped Fue
104. ng condition of the engine a The ignition timing data is stored in the ECM This data forms the map shown 2 The ECM receives information such as the injection pulse width S M and camshaft position sensor signal Computing this information 075 5 ignition signals are transmitted to the power transistor 1 800 rpm 1 50 msec 600 1 000 1 400 1 800 2 200 A BTDC Engine speed rpm SEF742M During the following conditions the ignition timing is revised by the ECM according to the other data stored in the ECM e At starting During warm up At idle Hot engine operation During acceleration EC GA 16 ENGINE AND EMISSION BASIC CONTROL INPUT OUTPUT SIGNAL LINE SYSTEM DESCRIPTION Air Conditioning Cut Control Air conditioner switch Air conditioner signal Neutral position switch NUES position Throttle position sensor gt Throttle valve opening angle Camshaft position sensor Engine speed Engine coolant temperature Engine coolant temperature sensor Ignition switch gt Start signal Vehicle speed sensor MSHI SPSS Power steering oil pressure switch Power steering load signal SYSTEM DESCRIPTION This system improves acceleration when the air conditioner is used When the accelerator pedal is fully depressed the air conditioner is turned off for a few seconds INPUT OUTPUT SIGNAL LINE
105. oltage to E E G8 IDLE POSITION 0 50V 0 1V by rotating Measure output voltage of throttle position throttle position sensor Throttle position sensor using voltmeter and check that it is body sensor connector approx 0 35 to 0 65V Throttle valve fully F16 closed OK RESET IDLE POSITION MEMORY 1 Warm up engine suffi ciently 2 Select CLSD THL POSI in DATA MONI TOR mode with CONSULTI 3 Stop engine and wait at least 5 seconds 4 Turn ignition switch to ON position 4 5 Tu rn ignition switch to the LOCK position and wait at least 5 seconds 6 Repeat steps 4 and 5 until CLSD THL POSI in DATA MONITOR mode with CON SULT II changes to ON 24 Repeat steps 4 E SEF781S and 5 20 times y CHECK IDLE SPEED Check idle speed Models with daytime light system 800 50 rpm Models without daytime light system 700 50 rpm Adjust idle speed by turning idle adjusting screw After this inspection unnecessary diagnos tic trouble code No might be displayed Erase the stored memory in ECM INSPECTION END EC GA 54 TROUBLE DIAGNOSIS General Description Fast Idle Cam FIC Inspection and Adjustment COOLANTEMP S C 1 Start engine and warm it up 2 See COOLAN TEMP S in DATA MONITOR mode with CONSULT II 3 When engine coolant temperature is 75 to 85 C 167 to 185
106. on Check voltage between fuel pump relay connector terminals 1 5 and ground with CONSULT II or tester Voltage Battery voltage CHECK GROUND CIRCUIT 1 Turn ignition switch to LOCK position 2 Disconnect fuel pump harness connec tor 3 Check harness continuity between fuel pump connector terminal 2 and body ground fuel pump connector terminal 1 and fuel pump relay connector terminal Q Continuity should exist If OK check harness for short circuit m CHECK OUTPUT SIGNAL CIRCUIT 1 Disconnect ECM harness connector 2 Check harness continuity between ECM connector terminal and fuel pump relay connector terminal 2 Continuity should exist If OK check harness for short circuit OK EC GA 115 OK NG INSPECTION END Check the following 15 fuse Harness for open or short circuit between bat tery and fuel pump relay If NG replace 15A fuse or repair harness or connec tors Check the following Harness for open or short circuit between fuel pump and body ground Harness for open or short circuit between fuel pump and fuel pump relay If NG repair harness or connectors Check the following Harness connectors wo Harness for open or short between ECM and fuel pump relay If NG repair harness or connectors TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Fuel Pump Cont d
107. on switch to LOCK position tors E 2 Loosen and retighten engine ground screws Check harness continuity between mass DISCONNECT air flow sensor connector terminal 2 2 F38 and engine ground Mass air flow Continuity should exist sensor connector If OK check harness for short circuit _ GA CHECK INPUT SIGNAL CIRCUIT Repair harness Disconnect ECM harness connector tors 2 Check harness continuity between mass air flow sensor connector terminal 1 and ECM connector terminal 46 Continuity should exist DISCONNECT If OK check harness for short circuit At o 1 SEF790S ECM Replace mass air flow sen 16 F38 Mass air flow sensor sor s Refer to COMPONENT INSPECTION on flow next page sensor OK GA y Y connector SEF791S Disconnect and reconnect harness connec tors in the circuits Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness connector Reconnect ECM harness connector and retest INSPECTION END EC GA 79 TROUBLE DIAGNOSIS FOR DTC 12 y CONNECT Mass air flow 24 1 54 SEF695K Hot wire SEF154N Mass Air Flow Sensor MAFS Cont d COMPONENT INSPECTION Mass ai
108. ont exhaust tube It detects the amount of oxygen in the exhaust gas compared to the outside air The heated oxygen sensor has a closed end tube made of ceramic zirconia The zirconia generates voltage from approximately 1V in richer conditions to OV in leaner conditions The heated oxygen sensor signal is sent to the ECM The ECM adjusts the injection pulse duration to achieve the ideal air fuel ratio The ideal air fuel ratio occurs near the radical change from 1V to OV EC GA 105 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Heated Oxygen Sensor HO2S Cont d IGNITION SWITCH EC HO2S 01 FUSE 2 BLOCK Refer to EL POWER J B Dectable line for DTC Non detectable line for DTC R B 221 F104 BR HEATED OXYGEN SENSOR JOINT CONNECTOR 1 5 1 r1 B B B i eJ a F15 REFER TO THE FOLLOWING FUSE BLOCK HETSETEE 101010 Junction Box WB eeu za 815101121314 D 295 106 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS DATA MONITOR MONITOR CMPS RPM REF M R F C MNT Y 7 SAT652J DISCONNECT DISCONNECT AE TS Heated oxygen sensor 1 ECM o CONNECTOR connector 2 19 101 4 L W L W DISCONNECT DISCONNECT HS __ Lees connec oxygen sensor
109. osed throttle position OFF Other than closed throttle posi tion AIR COND SIG e Indicates ON OFF condition of the ON OFF O air conditioner switch as determined by the air conditioning signal P N POSI SW e Indicates ON OFF condition from the ON OFF O park neutral position switch signal PW ST SIGNAL Indicates ON OFF condition of the ON OFF power steering oil pressure switch O determined by the power steering oil pressure signal NOTE Any monitored item that does not match the vehicle being diagnosed is deleted from the display automati cally EC GA 39 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT II Cont d Monitored item ECM Unit input signals Main signals Description Remarks LOAD SIGNAL ON OFF e Indicates ON OFF condition from the rear defogger signal and or lighting switch ON Rear defogger is operating and or lighting switch is on OFF Rear defogger is not operating and lighting switch is not on INJ PULSE msec Indicates the actual fuel injection e When the engine is stopped a certain pulse width compensated by ECM computed value is indicated according to the input signals IGN TIMING BTDC Indicates the ignition timing computed by ECM according to the input sig nals e Indicates the idle air control valve AAC valve control value computed by ECM according to the input sig IACV AAC V nals A F ALPHA e Indicates the mean value of the
110. ou read wiring diagrams e Read section HOW TO READ WIRING DIAGRAMS e See EL section POWER SUPPLY ROUTING for power distribution circuit e See EL section for NATS information and wiring diagram When you perform trouble diagnoses read section HOW TO FOLLOW FLOW CHART IN TROUBLE DIAGNOSES and HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT For clarification of system component abbreviations and terminology read Gl section SAE J1930 TERMINOLOGY LIST EC GA 2 PRECAUTIONS AND PREPARATION Special Service Tools X Applicable Not applicable Tool number Tool name EG11140000 Ignition coil adapter harness Description Measuring engine speed X NT338 KV10117100 Loosening or tightening heated oxy Heated oxygen sensor gen sensor wrench X NT630 Precautions SUPPLEMENTAL RESTRAINT SYSTEM SRS AIR and SEAT BELT PRE TENSIONER The Supplemental Restraint System Air Bag and Seat Belt Pre tensioner used along with a seat belt help to reduce the risk or severity of injury to the driver and front passenger in a frontal collision The Supplemental Restraint System consists of an air bag module located in the center of the steering wheel on the instrument panel on the passengers side where fitted seat belt pre tensioners a diagnosis sensor unit warning lamp wiring harness and spiral cable In addition to the suppl
111. p engine speed at about 2 000 rpm until engine is warmed up suffi ciently 3 Make sure that cooling fan begins to operate during warm up CHECK POWER SUPPLY NG 1 Turn air conditioner switch to OFF Check the following e Harness connector position 2 Turn blower fan switch to OFF 40 fusible link position e 10A fuse e Harness for open or short circuit between fuse and cooling fan relay e Harness for open or short circuit between battery and cooling fan relay Step 1 and 2 are only performed for models with air conditioner Stop engine Disconnect cooling fan relay Turn ignition switch to ON posi tion Check voltage between cooling fan relay connector terminals gi amp and ground If NG replace fuse or Voltage Battery voltage fusible link or repair har ness or connectors 4 126 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Cooling Fan Control Cont d DISCONNECT DISCONNECT 7 p TS Cooling fan cba C 26 relay connector cba E CHECK GROUND CIRCUIT 1 Turn ignition switch to LOCK posi tion 2 Disconnect cooling fan motor 1 har ness connector and cooling fan motor 2 harness connector 3 Check harness continuity between cooling fan motor 1 amp 2 connector terminals 1 and cooling fan relay connector terminal 5 cooling fan motor 1
112. pts input signals from sensors and instantly drives actua tors It is essential that both input and output signals are correct and stable At the same time it is important that there are no problems such as vacuum leaks fouled spark plugs or other problems with the engine It is much more difficult to diagnose a problem that occurs inter mittently rather than catastrophically Most intermittent problems are caused by poor electrical connections or faulty wiring In this case careful checking of suspected circuits may help prevent the unnecessary replacement of good parts A visual check only may not find the cause of the problems A road test with CONSULT II or a circuit tester connected should be performed Follow the Work Flow on the next page Before undertaking actual checks take just a few minutes to talk with a customer who approaches with a driveability complaint The customer can supply good information about such problems especially intermittent ones Find out what symptoms are present and under what conditions they occur A Diagnostic Worksheet like the example on EC GA 49 should be used Start your diagnosis by looking for conventional problems first This will help troubleshoot driveability problems on a vehicle equipped with an electronically controlled engine EC GA 46 TROUBLE DIAGNOSIS General Description Work Flow CHECK IN y Listen to customer complaints Get symptoms y Check p
113. r Engine coolant temperature sensor Heated oxygen sensor Vehicle speed sensor Throttle position sensor Ignition switch start signal Air conditioner switch Neutral position switch Power steering oil pressure switch Electrical load signal Battery voltage OUTPUT ENGINE CONTROL MODULE COMPONENT PARTS X Applicable FUNCTION Injectors X Ignition Power transistor Ignition timing signal IACV AAC valve Air conditioner relay Fuel pump relay Cooling fan EGR valve amp EVAP canister purge control solenoid valve Diagnostic test mode Function Work support A technician can adjust some devices faster and more accurately by following indications CONSULT II Self diagnostic results Self diagnostic results can be read and erased quickly Data monitor Input Output data in the ECM can be read Active test CONSULT II drives some actuators apart from the ECM s and also shifts some parameters in a specified range ECM part numbers ECM part numbers can be read EC GA 37 ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT II Cont d WORK SUPPORT MODE WORK ITEM CONDITION USAGE IGNITION TIMING ADJ IGNITION TIMING FEEDBACK CONTROL WILL BE When adjusting initial ignition HELD BY TOUCHING START AFTER DOING SO timing ADJUST IGNITION TIMING WITH A TIMING LIGHT BY TURNING THE CAMSHAFT POS
114. r 5 seconds Operates When engine is stopped Except as shown above COMPONENT DESCRIPTION A turbine type design fuel pump is used in the fuel tank EC GA 113 Stops in 1 second Stops TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Fuel Pump Cont d EC F PUMP 01 IGNITION SWITCH ON or START FUSE Emm Dectable line for DTC BLOCK J B Refer to EL POWER wmm Non detectable line for 1 27 SIS 1 18 m v E mm REFER TO THE FOLLOWING FUSE BLOCK Junction Box J B 2 2 GY FUSE BLOCK Junction box J B YEC297 EC GA 114 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Fuel Pump Cont d DIAGNOSTIC PROCEDURE INSPECTION START Q Fuel pump relay connector 3 YEC336 6 6 Fuel pump relay GID 3 connector B Y B30 1 2 Fuel B pump connector YEC337 DISCONNECT Iss DISCONNECT AE 3 O CONNECTOR 106 1 42 Fuel pump relay connector B P 52 YEC338 CHECK OVERALL FUNCTION 1 Turn ignition switch to ON position 2 Pinch fuel feed hose with fingers Fuel pressure pulsation should be felt on the fuel feed hose for 5 seconds after ignition switch is turned to position CHECK POWER SUPPLY 1 Turn ignition switch to LOCK position Disconnect fuel pump relay Turn ignition switch to ON positi
115. r flow sensor 1 Turn ignition switch to ON position 2 Start engine and warm it up sufficiently 3 Check voltage between mass air flow connector terminal 1 and ground Conditions Voltage V Ignition switch ON position Engine stopped Less than 1 0 Idle Engine is warmed up sufficiently 1 2 1 8 4 If NG remove mass air flow sensor from air duct Check hot wire for damage or dust EC GA 80 TROUBLE DIAGNOSIS FOR DTC 13 Terminal Sensor SEF594K Engine Coolant Temperature Sensor ECTS The engine coolant temperature sensor is used to detect the engine coolant temperature The sensor modifies a voltage sig nal from the ECM The modified signal returns to the ECM as the engine coolant temperature input The sensor uses a thermistor which is sensitive to the change in temperature The electrical resistance of the thermistor decreases as temperature increases Reference data 10 8 522 Voltage Resistance g 4 Acceptable V C F 8 10 10 14 44 7 0 11 4 04 20 68 3 5 24 29 02 50 122 2 2 0 6 1 0 01720 0 20 40 60 80 100 90 194 0 9 0 23 0 26 4 32 68 104 140 176 212 Temperature C F SEFO12P Diagnostic heck Trouble Code Malfunction is detected when ie No 13 e An excessively high or low voltage from the sensor e Harness or connectors is entered to ECM The sensor circuit is open or short
116. r repair harness or connectors Repair harness or connec tors CHECK COMPONENT Heated oxygen sensor heater Refer to COMPONENT INSPECTION on next page Disconnect and reconnect harness connec tors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness connector Reconnect ECM harness connector and retest Trouble is not fixed Replace heated oxygen sensor EC GA 108 NG Replace heated oxygen sensor TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Heated oxygen sensor connector wa TS DISCONNECT SEF586Q Heated Oxygen Sensor HO2S Cont d COMPONENT INSPECTION Heated oxygen sensor heater Check resistance between heated oxygen sensor connector ter minals 3 and 1 Resistance 2 3 4 30 at 25 77 F Check continuity between terminals 2 and 1 3 and 2 Continuity should not exist If NG replace the heated oxygen sensor CAUTION e Discard any oxygen sensor which has been dropped from a height of more than 0 5 m 19 7 in onto a hard surface such as a concrete floor and replace with a new one EC GA 109 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Injector IGNITION SWITCH FUSE Refer to EL POWER BLOCK J B Dectable line for DTC wmmm Non detectable line for DTC B R B R F104 B R D B R ell I
117. r to EL POWER W L Detectable line for DTC Non detectable line for DTC ENGINE CONTROL MODULE RELAY W R DISTRIBUTOR CAMSHAFT POSITION SENSOR 4 ILS W G W R W R L W B I s e JOINT CONNECTOR 1 F107 Quer p 18 15 SSS L GY 6 7 8 9 GY 101 102 103104105 105107 18 1 2 3 4 5 6 7 o 15116 17 18 19 20 21 22 8 9 10 11 12 13 14 HS YEC289 EC GA 74 TROUBLE DIAGNOSIS FOR DTC 11 Camshaft Position Sensor CMPS DIAGNOSTIC PROCEDURE und em INSPECTION START position 5 6 sensor harness CHECK POWER SUPPLY Check the following W R Turn ignition switch to LOCK position e 10A fuse in fusible link Disconnect camshaft position sensor holder harness connector e Operation of engine con Turn ignition switch to ON position trol module relay Check voltage between camshaft posi e Harness connectors tion sensor connector terminal 5 and CE ground with CONSULT II or tester e Harness for open or Voltage Battery voltage short circuit between camshaft position sensor lt SEF524Q Wmd ami A and engine control mod TS GA ule relay Harness for open or 1 short circuit between engine control module 2 4 5 6 relay and battery power supply If NG replace 1
118. rame For details refer to Freeze Frame Data EC GA 38 This mode gains access to emission related power train trouble codes which were stored by ECM This mode can clear all emission related diagnostic information This includes e Clear number of diagnostic trouble codes MODE 1 e Clear diagnostic trouble codes MODE 3 MODE 4 CLEAR DIAG INFO e Clear trouble code for freeze frame data MODE 1 e Clear freeze frame data MODE 2 e Reset status of system monitoring test MODE 1 e Clear on board monitoring test results MODE 6 and 7 MODE 3 DTCs This mode accesses the results of on board diagnostic monitoring tests of specific MODE E ON BOARD TESTS components systems that are not continuously monitored This mode enables the off board test drive to obtain test results for emission re MODE 7 ON BOARD TESTS lated powertrain components systems that are continuously monitored during nor mal driving conditions MODE 8 This mode is not applicable on this vehicle This mode enables the off board External test equipment to request specific MODE 9 CALIBRATION ID vehicle information such as Vehicle Identification Number VIN and Calibration IDs EC GA 45 TROUBLE DIAGNOSIS General Description Sensors Actuators MEFO036D SEF234G Introduction The engine has an ECM to control major systems such as fuel control ignition control idle air control system etc The ECM acce
119. ring oil pressure switch DIAGNOSTIC PROCEDURE MONITORING NO FAIL PW ST SIGNAL CHECK OVERALL FUNCTION INSPECTION END 1 Start engine and warm it up sufficiently 2 Check PW ST SIGNAL in DATA MONITOR mode with CONSULT II Steering is in neutral position OFF Steering is turned 5911 ON OR Check voltage between ECM connector terminal and ground Voltage When steering wheel is turned quickly Approximately 0V Except above Approximately 5V EC GA 130 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS DISCONNECT TS Power steering oil pressure switch connector GIO B YE 342 Power Steering Oil Pressure Switch Cont d 24 24 ECM 43 PU W Power steering oil pressure switch PU W YEC343 3 CHECK GROUND CIRCUIT NG Repair harness or connec 1 Turn ignition switch to LOCK position tors 2 Disconnect power steering oil pressure switch harness connector Check harness continuity between power steering oil pressure switch connector terminal and engine ground Continuity should exist If OK check harness for short circuit OK CHECK INPUT SIGNAL CIRCUIT NG Check the following 1 Disconnect ECM harness connector Harness connectors 2 Check harness continuity between ECM FI connector terminal and power steer e Harness
120. rint out or write down erase Diagnostic Trouble Code DTC No symptoms but Malfunction Code exists at STEP Symptoms collected Verify the symptom by driving in the condition the customer described Malfunction Code at STEP Il Normal Code at STEP Il Choose the appropriate action Malfunction Code at STEP II or IV y BASIC INSPECTION SYMPTOM BASIS at STEP I or III Perform inspections according to Symptom Matrix Chart TROUBLE DIAGNOSIS FOR DTC Refer to REPAIR REPLACE Verify the DTC by performing the DTC CONFIRMATION PROCEDURE STEP Ill Normal Code at both STEP II and IV STEP VI NG FINAL CHECK Confirm that the incident is completely fixed by performing BASIC INSPECTION and DTC CONFIRMATION PROCEDURE or OVERALL FUNCTION CHECK STEP VII CHECK OUT 1 If the incident cannot be duplicated refer to section Incident Simulation Tests HOW TO PERFORM EFFI CIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT 2 If the on board diagnostic system cannot be performed check main power supply and ground circuit Refer to TROUBLE DIAGNOSIS FOR POWER SUPPLY EC GA 47 TROUBLE DIAGNOSIS General Description Description for Work Flow STEP DESCRIPTION STEP Get detailed information about the conditions and the environment when the incident symptom occurred using the DIA
121. rough the valve The flow goes through the hose connection in the reverse direction On vehicles with an excessively high blow by the valve does not meet the requirement This is because some of the flow will go through the hose connection to the intake manifold collector under all conditions Cruising PCV valve Acceleration or high load PCV valve PCV valve operation Filter Engine not running or Cruising backfiring Idling or Acceleration decelerating or high load PAR Eni gt gt Fresh Air mb Blow by gas SEF780S EC GA 20 POSITIVE CRANKCASE VENTILATION AEC904 Inspection PCV Positive Crankcase Ventilation VALVE With engine running at idle remove PCV valve from rocker cover A properly working valve makes a hissing noise as air passes through it A strong vacuum should be felt immediately when a finger is placed over the valve inlet PCV HOSE 1 Check hoses and hose connections for leaks 2 Disconnect all hoses and clean with compressed air If any hose cannot be freed of obstructions replace EC GA 21 BASIC SERVICE PROCEDURE FUEL PRES RELEASE FUEL PUMP WILL STOP BY TOUCHING START DURING IDLE CRANK A FEW TIMES AFTER ENGINE STALL PEF823K Fuel pump fuse oN PENES YEC323 E NEF367 Fuel Pressure Release Before disconnectin
122. rt headlamp relay LH OK and ECM If NG repair harness or connectors Disconnect and reconnect harness connectors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness con nector Reconnect ECM harness con nector and retest INSPECTION END EC GA 140 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS amp Data Link Connectors EC MIL DL 01 Detectable line for DTC IGNITION SWITCH ON or START FUSE BLOCK Refer to EL POWER J B wmmm Non detectable line for DTC B R 9 CONNECTOR COMBINATION METER M59 MALFUNCTION INDICATOR Iz 4 3 16 5 12 18 LG B FUSE BLOCK G B LG J B OR L CCE CO CS 02 icr F104 GB GW Gh GYL UJ GB GW Gh GYL l B B B J J 5 e e L In F18 F15 M28 M26 REFER TO THE FOLLOWING FUSE BLOCK gt 117 18 19 20 uneon LL 2 3 4 15 6 7 8 910112 2 3 4 5 16171819110 props ra rs te 17 te 19 20 21 22 23 24 may HS 11213 415 6 7 e 8 9110 1112 1314 05 EC GA 141 SERVICE DATA AND SPECIFICATIONS SDS General Specifications PRESSURE REGULATOR Fuel pressure at idling kPa kg cm psi Approximately Vacuum hose is connected 245 2 45 2 5
123. scription Symptom Matrix Chart Cont d SYMPTOM SYSTEM Engine mechanical amp other Reference page HESITATION SURGING FLAT SPOT SPARK KNOCK DETONATION LACK OF POWER POOR ACCELERATION HIGH IDLE LOW IDLE SLOW NO RETURN TO IDLE OVERHEATS WATER TEMPERATURE HIGH EXCESSIVE FUEL CONSUMPTION eels ro pepe o afroa HARD NO START RESTART IDLING VIBRATION bep ebbe gt Pepper BATTERY DEAD UNDER CHARGE Fuel Fuel tank Fuel piping Vapor lock Valve deposit Poor fuel Heavy weight gasoline Low octane Air Air duct Air cleaner Air leakage from air duct Mass air flow sensor throttle body Throttle body Throttle wire Air leakage from intake manifold Collector Gasket Cranking Battery Starter circuit Flywheel Engine Cylinder head Cylinder head gasket Cylinder block Piston Piston ring Connecting rod Bearing Crankshaft Valve Timing chain mechanism Camshaft Exhaust valve Exhaust Exhaust manifold Tube Muffler Gasket Three way catalyst Lubrication Oil pan Oil strainer Oil pump Oil filter Oil gallery Oil level Low Filthy oil Cooling Radiator Hose Radiator filler cap Thermostat Water pump FE section Je OJO EL section OlOlejejejejojojo e Olo lol Ol
124. ses are converted into on off signals by the wave forming circuit and sent to the ECM The distributor is not repairable and must be replaced as an assembly except distributor cap Rotor head Light emitting diode Photodiode Wave forming circuit 180 signal slit for No 1 cylinder 180 signal Rotor plate SEF194N b 7 7 Camshatt position sensor harness connector NEF375 Diagnostic T Check Items s Code Malfunction is detected when Possible cause e Harness or connectors The camshaft position sensor circuit is open or short circuited Camshaft position sensor Starter motor Refer to EL section Starting system circuit Refer to EL section Dead Weak battery 180 signal is not sent to ECM for the first few sec onds during engine cranking e The pulse width of 180 signal is smaller than the specified value DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE 1 ignition switch to ON position and select DATA MONITOR mode with CONSULT II 2 Crank engine for at least 2 seconds OR 1 Crank engine for at least 2 seconds amp 2 Turn ignition switch to LOCK position wait at least 5 seconds and then turn to ON position 3 Perform Diagnostic Test Mode Self diagnostic results with ECM EC GA 73 TROUBLE DIAGNOSIS FOR DTC 11 Camshaft Position Sensor CMPS EC CMPS 01 BATTERY 10A Refe
125. shaft position sensor e e e e Camshaft position sensor circuit RUNNING Refer to Overheat cause analysis ENGINE COOL ING SYSTEM in LC section LC section e Harness or connectors The sensor circuit is open or short circuited e Throttle position sensor e No failure EC GA 51 IGN ON EC GA 90 TROUBLE DIAGNOSIS General Description Fail Safe Chart The ECM enters fail safe mode if any of the following DTCs is recorded due to an open or short circuit DTC No Detected items Engine operating condition in fail safe mode 12 Mass air flow sensor Engine speed will not rise more than 2 400 rpm due to the fuel cut circuit 13 Engine coolant Engine coolant temperature will be determined based on the time after turning ignition temperature sensor switch to ON or START position circuit Condition Engine coolant temperature decided Just as ignition switch is turned ON or Start 35 95 F 7 than 4 5 minutes after ignition or 80 C 176 tart 35 80 C 95 176 F Except as shown above Depends on the time When the fail safe system for engine coolant temperature sensor is activated the cooling fan operates while engine is running 43 Throttle position Throttle position will be determined based on the injected fuel amount and the engine sensor circuit speed Therefore acceleration will be poor Condition Driving condition When engine is idling Norm
126. sition and stop engine 2 Disconnect IACV FICD solenoid valve harness connector 3 Restart engine then turn air condi tioner switch and blower fan switch Check the following e Harness connectors CER e Harness for open or short circuit between IACV FICD solenoid valve and air condi to ON position tioner relay 4 Check voltage between IACV FICD If NG repair harness or solenoid valve connector terminal connectors and ground with CONSULT II or voltage tester Voltage Battery voltage OK 9 122 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS IACV FICD Solenoid Valve Cont d n DISCONNECT CHECK GROUND CIRCUIT NG Repair harness or con valve connector ee P T F40 1 Turn ignition switch to LOCK posi nectors tion 2 Check harness continuity between IACV FICD solenoid valve connec tor terminal 2 and body ground Continuity should exist If OK check harness for short cir cuit CHECK COMPONENT Replace IACV FICD IACV FICD solenoid valve solenoid valve Refer to COMPONENT INSPEC TION below E Disconnect and reconnect harness connectors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness con nector Reconnect ECM harness con nector Then retest INSPECTION END COMPONENT INSPECTION IACV FICD solenoid
127. sor and circuit Refer to Inspection Speedometer and Vehicle Speed Sensor of METER AND GAUGES EL sec tion EC GA 96 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Vehicle Speed Sensor VSS Cont d E DISCONNECT a DISCONNECT CHECK INPUT SIGNAL CIRCUIT 1 Turn ignition switch to LOCK posi tion 2 Disconnect ECM harness connector and combination meter harness Check the following e Harness connectors e Harness for open or short circuit between 32 Combination meter connector speedometer Y G 1314 1516 17 18 19 20 11213 415 67 8 9 101112 connector ECM and combination 3 Check harness continuity between meter EDS ECM connector terminal and If NG repair harness or combination meter connector termi connectors nal 9 Continuity should exist If OK check harness for short cir cuit Disconnect and reconnect harness connectors in the circuit Then retest Trouble is not fixed Check ECM pin terminals for damage or the connection of ECM harness con nector Reconnect ECM harness con nector and retest INSPECTION END EC GA 97 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Start Signal EC S SIG 01 BATTERY Refer to EL POWER Detectable line for DTC mama Non detectable line for
128. tectable line for Non detectable line for DTC ENGINE CONTROL MODULE RELAY MASS AIR FLOW SENSOR F38 Q a JOINT CONNECTOP 1 2 1 77 B B B F18 F15 Piers tas ot o Eeee 819 290 78 TROUBLE DIAGNOSIS FOR DTC 12 Mass Air Flow Sensor MAFS Cont d DIAGNOSTIC PROCEDURE INSPECTION START gt 3 F38 Mass air CHECK POWER SUPPLY NG Check the following flow connector 1 Turn ignition switch to LOCK position 10 fuse in fusible link 2 Disconnect mass air flow sensor harness holder connector Operation of engine con 3 Turn ignition switch to position trol module relay 4 Check voltage between mass air flow Harness connectors connector terminal 2 and ground with CONSULT II or tester Harness for open or Voltage Battery positive voltage short circuit between mass air flow sensor and OK engine control module relay Harness for open or short circuit between engine control module relay and battery power supply If NG replace 10A fuse or engine control module relay or repair harness or connec tors a Y NG CHECK GROUND CIRCUIT Repair harness or connec 1 Turn igniti
129. teering wheel is not being turned Ignition switch OFF ov 44 B R Ignition switch B i BATTERY VOLTAGE Ignition switch ON 11 14V Engine is running Approximately L Blower fan switch is ON 45 LG B Blower fan switch Engine is running Approximately 5V Blower fan switch is OFF BATTERY VOLTAGE 46 W L Power supply Back up Ignition switch OFF 11 14V EC GA 66 TROUBLE DIAGNOSIS General Description ECM Terminals and Reference Value Cont d TERMINAL WIRE NO COLOR ITEM CONDITION DATA BATTERY VOLTAGE 11 14V 101 Injector No 1 V wre 40 _ 20 Ll Engine is running Warm up condition 50 L Idle speed 103 G B Injector No NEF358 BATTERY VOLTAGE 11 14V 110 Y B Injector No 2 Engine is running L Engine speed is 2 000 rpm 20ms 112 L B Injector No 4 NEF359 Engine is running BATTERY VOLTAGE EISE Heated oxygen sensor L Engine speed is above 3 200 rpm 11 14V heater ground Engine is running Approximately OV L_ Engine speed is below 3 200 rpm Engine is running Warm up condition Approximately OV EGR valve amp EVAP Idle speed 105 P canister purge control Engine is running Warm up condition solenoid valve BATTERY VOLTAGE Engine speed is 2 000 rp
130. the normal code Diagnostic trouble code STEP VII No 55 is detected If the incident is still detected in the final check perform STEP VI by using a different method from the previous one Before returning the vehicle to the customer be sure to erase the unnecessary already fixed DTC in ECM Refer to EC GA 48 TROUBLE DIAGNOSIS General Description Diagnostic Worksheet There are many operating conditions that lead to the malfunction KEY POINTS of engine components A good grasp of such conditions can WHAT Vehicle amp engine model make troubleshooting faster and more accurate WHEN Date Frequencies In general each customer feels differently about a problem It is WHERE Road conditions important to fully understand the symptoms or conditions for a HOW Operating conditions customer complaint Weather conditions Symptoms Utilize a diagnostic worksheet like the one shown below in order to organize all the information for troubleshooting SEF907L WORKSHEET SAMPLE Customer name 5 VIN Mileage Model amp Year Trans Engine Incident Date Manuf Date In Service Date Partial combustion Impossible to start No combustion Partial combustion affected by throttle position Partial combustion NOT affected by throttle position Possible but hard to start Others No fast idle Unstable O High idle Low idle Others Stumble O Knock Intake bac
131. then controls the IACV AAC valve so that engine speed coincides with the target value memorized in ECM The target engine speed is the lowest speed at which the engine can operate steadily The optimum value stored in the ECM is determined by taking into consideration various engine conditions such as during warm up deceleration and engine load air conditioner power steering and cooling fan operation Cub uu IACV FICD solenoid p RA IACV AAC valve COMPONENT DESCRIPTION IACV AAC valve The IACV AAC valve is moved by ON OFF pulses from the ECM The longer the ON pulse the greater the amount of air that will flow through the valve The more air that flows through the valve the higher the idle speed EC GA 117 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Idle Air Control Valve IACV Auxiliary Air Control AAC Valve Cont d IGNITION SWITCH ON or START 01 FUSE BLOCK Refer to EL POWER J B line for DTC BR Non detectable line for DTC BR Y M50 221 F104 BR BR IACV AACG VALVE 58 58 5 REFER TO THE FOLLOWING FUSE BLOCK Junction Box J B 111 02 1011418 18 7 18 4 2 3 4 5 6 7 o 15 16 17 18 19 20 21 22 19 10 11 eo prio na pre 8 91011 12 13 14 H S 298 118 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Idle Air Control Valve IACV Auxiliary
132. ting the engine During acceleration Hot engine operation High load high speed operation Fuel decrease e During deceleration EC GA 13 ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION Multiport Fuel Injection MFI System CLOSED LOOP Cont d MIXTURE RATIO FEEDBACK CONTROL CLOSED E Injection pulse LOOP CONTROL Feedback sonal module The mixture ratio feedback system provides the best air fuel mixture ratio for driveability and emission control The three way catalyst can then minimize CO HC and NOx emissions This system uses a heated oxygen sensor in the exhaust manifold to Combustion Fuel injection monitor if the engine operation is rich or lean The ECM adjusts o the injection pulse width according to the sensor voltage signal This maintains the mixture ratio within the stoichiometric range ideal air fuel mixture This stage is referred to as the closed loop control condition sensor MEFO25DD OPEN LOOP CONTROL The open loop system condition refers to when the ECM detects any of the following conditions Feedback control stops in order to maintain stabilized fuel combustion e Deceleration and acceleration High load high speed operation Engine idling Malfunction of heated oxygen sensor or its circuit Insufficient activation of heated oxygen sensor at low engine coolant temperature High engine coolant temperature e During warm up e When starting the engine MIXTUR
133. tion e These Diagnostic Trouble Code Numbers are clarified in Diagnostic Test Mode II SELF DIAGNOSTIC RESULTS DIAGNOSTIC TEST MODE SELF DIAGNOSTIC RESULTS In this mode a diagnostic trouble code is indicated by the number of flashes of the MALFUNCTION INDI CATOR as shown below Example Diagnostic trouble code No 12 and No 43 0 6 0 3 0 6 0 3 OFF 0 9 0 3 21 0 6 0 9 21 4 Unit second Diagnostic trouble code No 12 Diagnostic trouble code No 43 AEC490 Long 0 6 second flashes indicate the number of ten digits and short 0 3 second flashes indicate the number of single digits For example the malfunction indicator flashes 4 times for about 2 5 seconds 0 6 sec x 4 times and then flashes three times for about 1 second 0 3 sec x 3 times This indicates the DTC 43 and refers to the malfunction of the throttle position sensor In this way all the detected malfunctions are classified by their diagnostic trouble code numbers The DTC 55 refers to no malfunction See DIAGNOSTIC TROUBLE CODE CHART refer to HOW TO ERASE DIAGNOSTIC TEST MODE Self diagnostic results The diagnostic trouble code can be erased from the backup memory in the ECM when the diagnostic test mode is changed from Diagnostic Test Mode II to Diagnostic Test Mode Refer to HOW TO SWITCH DIAGNOSTIC TEST MODES on previous page e If the battery terminal is
134. tle adis Throttle position sensor sensor To adjust it perform Refer to COMPONENT INSPECTION on Basic Inspection B next page 155 Disconnect and reconnect harness connec tors in the circuit Then retest x SEF481Q Trouble is not fixed DISCONNECT DISCONNECT Check ECM pin terminals for damage or the HS 54 connection of ECM harness connector Reconnect ECM harness connector and ECM O CONNECTOR retest 2 FS P INSPECTION END sensor GA connector SEF482Q EC GA 93 TROUBLE DIAGNOSIS FOR DTC 43 DISCONNECT GB Throttle 3 201 position SEF146R Throttle Position Sensor Cont d COMPONENT INSPECTION Throttle position sensor 1 Disconnect throttle position sensor harness connector 2 Make sure that resistance between throttle position sensor terminals 2 and changes when opening throttle valve manually Throttle valve conditions Resistance at 25 C 77 F Completely closed Approximately 0 5 kQ Partially open 0 5 4 0 kQ Completely open Approximately 4 0 If NG replace throttle position sensor To adjust it perform Basic Inspection EC GA 53 EC GA 94 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Vehicle Speed Sensor VSS IGNITION SWITCH EC V 01 ON or START C VSS 0 FUSE BLOCK J B Refer to EL POWER
135. tween ECM and battery If NG replace 7 5A fuse or repair harness or connectors CHECK POWER SUPPLY III BR Go to CHECK GROUND 1 Turn ignition switch to and then CIRCUIT to LOCK position 2 Check voltage between ECM connec tor terminals 8 8 and ground with CONSULT II or tester After turning ignition switch to LOCK position battery voltage will exist for a few seconds then drop to approximately OV NG Case2 y Goto 2 CHECK ENGINE CONTROL MODULE RELAY on next page Case 1 Battery voltage does not exist for a few seconds Case 2 Battery voltage exists for more than a few sec onds EC GA 70 TROUBLE DIAGNOSIS FOR POWER SUPPLY Main Power Supply and Ground Circuit Cont d Passenger side m CHECK HARNESS CONTINUITY BETWEEN ENGINE CONTROL MODULE RELAY AND ECM 1 Disconnect ECM harness connector 2 Disconnect engine control module relay 3 Check harness continuity between ECM Check the following Harness connectors ues e Harness for open or short circuit between ECM and engine control connector terminals 8 47 and module relay engine control module relay connector If NG repair harness or terminal 3 connectors Continuity should exist If OK check harness for short circuit CHECK VOLTAGE BETWEEN ENGINE CONTROL MODULE RE
136. unlocked connector will cause malfunction due to the open circuit Be sure the connector is free from water grease dirt bent terminals etc Be sure to route and clamp the harnesses properly after work The interference of the harness with a bracket etc may cause malfunction due to the short circuit Be sure to connect rubber tubes properly after work A misconnected or disconnected rubber tube may cause malfunction Be sure to erase the unnecessary malfunction information repairs completed in the ECM before returning the vehicle to the customer Precautions e Before connecting or disconnecting the ECM harness connector turn ignition switch OFF and disconnect negative battery terminal Failure to do so may damage the ECM because battery voltage is applied to ECM even if ignition switch is turned off SEF289H e When connecting ECM harness connector tighten securing bolt until red projection is in line with connec Red tor face projection 9 3 0 5 0 N m 0 3 0 5 kg m 26 43 in Ib Protector SEF725H When connecting or disconnecting pin connectors into or from ECM take care not to damage pin terminals bend or break Make sure that there are not any bends or breaks on ECM pin terminal when connecting pin connectors Bend Break SEF291H EC GA 5 PRECAUTIONS AND PREPARATION Precautions Cont d e Before replacing ECM perform Terminals and Reference Perform ECM input
137. witch is Battery voltage Rear window defogger switch is OFF Approximately Check rear window defogger circuit Go to Procedure DISCONNECT AE Qe 33 CHECK OVERALL FUNCTION II 1 Turn rear window defogger switch to OFF position C2DMMO4 2 Check LOAD SIGNAL in DATA MONITOR mode E ES fy with CONSULT II 22 Lighting switch is _ o connectoa Lighting switch is OFF Fio F101 OFF Check lighting switch circuit Go to Procedure B LI OR 24 2 Turn ignition switch to gt LOCK position 3 Check voltage between ECM connector terminal 3 and ground under the following conditions Voltage Lighting switch is Battery voltage Lighting switch is OFF Approximately 0V 9 SEF802S EC GA 137 TROUBLE DIAGNOSIS FOR NON DETECTABLE ITEMS Electrical Load Signal Cont d CHECK POWER AND GROUND NG Check the following CIRCUIT e Harness connectors 1 Turn ignition switch to LOCK posi 150 tion e Harness connectors 2 Check continuity between ECM con MD nector terminal and ground e Harness continuity SEF803S Blower fan switch between ECM and fan

ENGINE CONTROL SYSTEM SECTION EC CONTENTS

Contents

Download Pdf Manuals

Related Search

Related Contents