| Model | Year | Engine identification | System |
|---|---|---|---|
| 2.5TL | 1995-98 | G25A4 | PGM-FI |
General information
- Refer to the front of this manual for general test conditions, terminology, detailed descriptions of wiring faults and a general trouble shooter for electrical and mechanical faults.
- Engine control module (ECM) incorporates self-diagnosis function.
- Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
- ECM operates in backup mode if sensors fail, to enable vehicle to be driven to workshop.
- Trouble codes can be displayed by using a Scan Tool connected to the data link connector (DLC) 1 [1] or by the malfunction indicator lamp (MIL) with the service check connector jumped [1] [2].
NOTE: The use of a Scan Tool is essential to obtain full diagnostic information.
Accessing
- Ensure ignition switched OFF.
- Jump service check connector terminals [1] [2].
- Switch ignition ON.
- Check MIL is flashing.
- Trouble codes 1-9 are indicated as follows:
o Individual short flashes display trouble code [1] [A].o A short pause separates each flash [2] [B].o A long pause separates each trouble code [2] [C).o For example: Trouble code 3 displayed [2].
- Trouble codes greater than 9 are indicated as follows:
o Long flashes indicate the ‘tens’ of the trouble code [3] [A].o Short flashes indicate the ‘units’ of the trouble code [3] [C].o A short pause separates each flash [3] (B).o A long pause separates each trouble code [3] [D].o For example: Trouble code 12 displayed [3].
- Count MIL flashes and compare with trouble code table.
- Switch ignition OFF.
- Remove jump lead.
Erasing
- After the faults have been rectified, trouble codes can be erased by using a Scan Tool connected to the data link connector (DLC) or as follows:
- Switch ignition OFF.
- Remove radio fuse No.39 (1OA) from underhood fusebox for 10 seconds minimum [4].
- Reinstall fuse.
- Repeat checking procedure to ensure no data remains in ECM fault memory.
Trouble code identification
Flash code | OBD·II code | Fault location | Probable cause |
| – | PO, P2,uo | Refer to OBD-11 trouble code tables | – |
| 1 | – | Heated oxygen sensor (H02S) – front – circuit malfunction | Wiring, H02S |
| 4 | – | Crankshaft position (CKP) sensor 1 – range/performance problem/circuit malfunction | Wiring, CKP sensor, valve timing, ECM |
| 6 | – | Engine coolant temperature (ECT) sensor – circuit/voltage low/high | Wiring, ECT sensor, ECM |
| 7 | – | Throttle position (TP) sensor – circuit/ voltage low/high | Wiring, TP sensor, ECM |
| 7 | P1121 | Throttle position (TP) sensor – position lower than expected | TP sensor |
| 7 | P1122 | Throttle position (TP) sensor – position higher than expected | TP sensor |
| 8 | P1359 | Crankshaft position (CKP) sensor/engine speed (RPM) sensor – connector disconnection | Wiring |
| 8 | P1361 | Engine speed (RPM) sensor – intermittent signal | RPM sensor |
| 8 | P1362 | Engine speed (RPM) sensor- no signal | Wiring, RPM sensor, ECM |
| 9 | P1381 | Camshaft position (CMP) sensor – intermittent signal | CMP sensor |
| 9 | P1382 | Camshaft position (CMP) sensor- no signal | Wiring, CMP sensor, ECM |
| 10 | – | Intake air temperature (IAT) sensor- range/ performance problem/circuiUvoltage low | Wiring, IAT sensor, ECM |
| 12 | P1491 | Exhaust gas recirculation (EGR) system – valve lift insufficient | Wiring, EGR valve/position sensor, EGR solenoid, hose leak/blockage, ECM |
| 12 | P1498 | Exhaust gas recirculation (EGR) valve position sensor – voltage high | Wiring, EGR valve/position sensor, ECM |
| 13 | P1106 | Barometric pressure (BARO) sensor- range/performance problem | ECM |
| 13 | P1107 | Barometric pressure (BARO) sensor- circuiUvoltage low | ECM |
| 13 | P1108 | Barometric pressure (BARO) sensor- circuiUvoltage high | ECM |
| 14 | – | Idle control system – malfunction | lAC valve, fast idle thermo valve, throttle body |
| 14 | P1508 | Idle air control (lAC) valve – circuit failure | Wiring, lAC valve, ECM |
| 17 | – | Vehicle speed sensor (VSS)- voltage low | Wiring, VSS, ECM |
| 20 | P1297 | Electrical load sensor – circuiUvoltage low | Wiring, electrical load sensor, ECM |
| 20 | P1298 | Electrical load sensor – circuiUvoltage high | Wiring, electrical load sensor, ECM |
| 23 | – | Knock sensor (KS) – front- voltage low | Wiring, KS, ECM |
| 23 | – | Knock sensor (KS) – front – voltage high | Wiring, KS, ECM |
| 30 | P1681 | AT to ECM – signal A – input low | Wiring, TCM, ECM |
| 30 | P1682 | AT to ECM – signal A – input high | Wiring, TCM, ECM |
| 31 | P1686 | AT to ECM – signal B – input low | Wiring, TCM, ECM |
| 31 | P1687 | AT to ECM – signal B – input high | Wiring, TCM, ECM |
| 41 | – | Heated oxygen sensor (H02S)- heater circuit malfunction | Wiring, ECM |
| 45 | – | Mixture too lean/rich | Fuel system, front H02S, MAF sensor, mechanical fault |
| 50 | – | Mass air flow (MAF) sensor – range/ performance problem/voltage low/high | Wiring open circuit, MAF sensor, ECM |
| 50 | P1102 | Mass air flow (MAF) sensor – signal higher than expected | MAF sensor |
| 50 | P1103 | Mass air flow (MAF) sensor – signal higher than expected | MAF sensor |
| 53 | – | Knock sensor (KS) – rear- voltage low/ high | Wiring, KS, ECM |
| 54 | P1336 | Crankshaft position (CKP) sensor 2 – intermittent signal interruption | CKP sensor |
| 54 | P1337 | Crankshaft position (CKP) sensor 2 – no signal | Wiring, CKP sensor, ECM |
| 61 | – | Heated oxygen sensor (H02S) -front- slow response | H02S, exhaust system |
| 63 | – | Heated oxygen sensor (H02S) – rear- slow response | Wiring, H02S, ECM |
| 65 | – | Heated oxygen sensor (H02S) – rear- heater circuit malfunction | Wiring, ECM |
| 67 | – | Catalytic converter – efficiency below limit | Catalytic converter, rear H02S |
| 70 | – | AT·-Iock-up clutch not engaging/no gear shift | Wiring, mainshaft speed sensor, countershaft speed sensor, lock-up control system, shift solenoid (SS) AlB, TCM |
| 70 | P1660 | AT to TCM – data line failure | Wiring, ECM, TCM |
| 70 | P1705 | AT- gear shift malfunction | Wiring, range position switch, TCM |
| 70 | P1705 | AT – lock-up clutch not engaging | Wiring, range position switch, TCM |
| 70 | P1706 | AT – gear shift malfunction | Wiring, range position switch, TCM |
| 70 | P1706 | AT- lock-up clutch malfunction | Wiring, range position switch, TCM |
| 70 | P1753 | AT- lock-up clutch not engaging/ disengaging | Wiring, lock-up control solenoid A, TCM |
| 70 | P1758 | AT – no gear shift | Wiring, lock-up control solenoid B, TCM |
| 70 | P1768 | AT – no gear shift | Wiring, linear solenoid, TCM |
| 70 | P1768 | AT – lock-up clutch not engaging | Wiring, linear solenoid, TCM |
| 70 | P1786 | AT – poor gear shift | Communication wire, TCM |
| 70 | P1787 | AT – lock-up clutch malfunction | Communication wire, TCM |
| 70 | P1790 | AT- lock-up clutch not engaging | Wiring, TP sensor, TCM |
| 70 | P1791 | AT – lock-up clutch not engaging | Wiring, VSS, TCM |
| 70 | P1792 | AT – lock-up clutch not engaging | Wiring, ECT sensor, TCM |
| 70 | P1794 | Automatic transmission – BARO signal | Wiring, ECM, TCM |
| 71 | – | Cylinder No.1 – misfire | Wiring, injector, ignition system, mechanical fault |
| 72 | – | Cylinder No.2 – misfire | Wiring, injector, ignition system, mechanical fault |
| 73 | – | Cylinder No.3 – misfire | Wiring, injector, ignition system, mechanical fault |
| 4 | – | Cylinder No.4 – misfire | Wiring, injector, ignition system, mechanical fault |
| 75 | – | Cylinder No.5 – misfire | Wiring, injector, ignition system, mechanical fault |
| 76 | – | Random misfire | lgnition/fuei/EGR system, MAF sensor, lAC valve |
| 80 | – | Exhaust gas recirculation (EGR) solenoid – insufficient flow | EGR valve, hose/pipe leak or blockage |
| 86 | – | Engine coolant temperature (ECT) sensor – range/performance problem | ECT sensor, cooling system |
| 91 | – | Fuel tank pressure sensor- circuiUvoltage low/high | Wiring, pressure sensor, ECM |
| 92 | – | Evaporative emission (EVAP) canister purge system – leak detected/incorrect flow | Wiring, hose leak/blockage, fuel tank/ pressure sensor, fuel filler cap, EVAP valve/bypass solenoid/flow switch, EVAP two way valve, EVAP canister/vent valve, throttle body, ECM |
| 92 | P1459 | Evaporative emission (EVAP) canister purge system – switch malfunction | Wiring, flow switch, hose leak/blockage, ECM |