| 92-95 4.3L VIN Z, W |
|---|
| Flash code | Fault location | Probable cause |
|---|
| 12 | Start of diagnosis | No engine speed (RPM) signal received |
| 13 | Oxygen sensor (02S)/heated oxygen sensor (H02S) | Wiring open circuit, oxygen sensor(02S)/ heated oxygen sensor (H02S), ECM |
| 14 | Engine coolant temperature (ECT) sensor -high temperature indicated | Wiring short circuit to ground, ECT sensor, ECM |
| 15 | Engine coolant temperature (ECT) sensor -low temperature indicated | Wiring open circuit, ECT sensor, ECM |
| 16 | Battery voltage -low | Wiring; alternator |
| 16 (VIN W) | Vehicle speed sensor (VSS) buffer -signal low | Wiring, VSS buffer, ECM |
| 17 | Camshaft position (CMP) sensor | Wiring open circuit/short circuit to ground/ short circuit to positive, CMP sensor, mechanical fault, ECM |
| 19 | Ignition control module (ICM) -7X reference circuit malfunction | Wiring, CKP sensor, PROM, ECM |
| 21 | Throttle position (TP) sensor -voltage high | Wiring open circuit/short circuit to positive, TP sensor, ECM |
| 22 | Throttle position (TP) sensor -voltage low | Wiring open circuit/short circuit to ground, TP sensor, ECM |
| 23 | Intake air temperature (IAT) sensor -low temperature indicated | Wiring open circuit, IAT sensor, ECW. |
| 24 | Vehicle speed sensor (VSS) | Wiring open circuit/short circuit to ground, VSS, ECM |
| 25 | Intake air temperature (IAT) sensor -high temperature indicated | Wiring short circuit to ground, IAT sensor, ECM |
| 26 | Engine control module quad driver/output driver | Wiring, ECM controlled components, ECM |
| 27 | Engine control module quad driver/output driver | Wiring, ECM controlled components, ECM |
| 28 | Transmission range (TR) switch | Wiring open circuit/short circuit to ground/short circuit to positive, TR switch, ECloI |
| 29 | Engine control module quad driver/output driver | Wiring, ECM controlled components, ECM |
| 31 | Park/neutral position (PNP) switch | Wiring short circuit to ground, incorrectly adjusted, PNP switch, ECM |
| 32 | Exhaust gas recirculation (EGR) solenoid | Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM |
| 33 | Manifold absolute pressure (MAP) sensor -voltage high, low vacuum indicated | Wiring short circuit to positive, hose blocked/leaking, MAP sensor, ECM |
| 34 | Manifold absolute pressure (MAP) sensor -voltage low, high vacuum indicated | Wiring open circuit/short circuit to ground, MAP sensor, ECM |
| 35 | Idle air control (lAC) valve | Wiring open circuit/short circuit to ground/short circuit to positive, lAC valve, intake system leaking, fuel system, PCV valve, A/C system, mechanical fault, ECM |
| 36 | 24X crankshaft position sensor (CKP) -circuit malfunction | Wiring open circuit/short circuit to ground, 24X CKP sensor, ECM |
| 37 | Brake pedal position (BPP) switch | Wiring open circuit/short circuit to grounc incorrectly adjusted, BPP switch, ECM |
| 39 | Clutch pedal position (CPP) switch | Wiring open circuit/short circuit to ground incorrectly adjusted, CPP switch, ECM |
| 42 | Ignition control module (ICM) -circuit malfunction | Wiring open circuit/short circuit to ground, ignition control module (ICM), ECM |
| 43 | Knock sensor (KS) | Wiring open circuit/short circuit to ground/ short circuit to positive, KS incorrectly fitted, KS, insecure PROM, ECM |
| 44 | Oxygen sensor (02S)/heated oxygen sensor (H02S) -mixture lean | Wiring open circuit/short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 02S/H02S, ECM |
| 45 | Oxygen sensor (02S)/heated oxygen sensor (H02S) -mixture rich | Wiring open circuit, fuel pressure high, injector(s) leaking, 02S contamination, evaporative emission (EVAP) canister purge valve, throttle position (TP) sensor, EGR system, 02S/H02S, ECM |
| 46 | Immobilizer control module -fuel enable signal | Incorrect ignition key, wiring open circuit/ short circuit to ground/short circuit to positive, immobilizer control module, ECM |
| 51 | Engine control module (ECM) -PROM | Insecure PROM, incorrect PROM, ECM |
| 52 | Engine control module (ECM) | ECM |
| 53 | Battery voltage -high/low | Wiring, alternator |
| 54 | Fuel pump circuit -voltage low | Wiring open circuit/short circuit to ground, fuel pump relay, engine oil pressure warning lamp switch |
| 58 | Transmission fluid temperature (TFT) sensor -voltage low | Wiring short circuit to ground, TFT sensor, ECM |
| 59 | Transmission fluid temperature (TFT) sensor -voltage high | Wiring open circuit, TFT sensor, ECM |
| 61 | Oxygen sensor (02S)/heated oxygen sensor (H02S) | Oxygen sensor (02S)/heated oxygen sensor (H02S) |
| 62 | Transmission gear switch signal circuit | Wiring open circuit/short circuit to ground, 2nd gear switch, 3rd gear switch, ECM |
| 65 | Injectors -circuit malfunction | Wiring open circuit/short circuit to ground/ short circuit to positive, injectors, ECM |
| 66 | A/C refrigerant pressure sensor -voltage low | Wiring open circuit/short circuit to ground/ short circuit to positive, A/C refrigerant pressure sensor, ECM |
| 70 | A/C refrigerant pressure sensor -voltage high | Wiring open circuit/short circuit to positive, A/C refrigerant pressure sensor, ECM |
| 72 | Vehicle speed sensor (VSS) | Wiring open circuit/short circuit to ground, VSS, ECM |
| 75 | Exhaust gas recirculation (EGR) valve solenoid 1 | Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM |
| 76 | Exhaust gas recirculation (EGR) valve solenoid 2 | Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM |
| 77 | Exhaust gas recirculation (EGR) valve solenoid 3 | Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM |
| 82 | Ignition control module (ICM) -3X reference circuit malfunction | Wiring open circuit/short circuit to ground, 3X CKP signal sensor, ICM |
| 85 | Engine control module (ECM) -PROM | Insecure PROM, incorrectly coded |
| 85 | Engine control module (ECM) -PROM | Insecure PROM, incorrectly coded |
| 86 | Engine control module (ECM) -analogue/ digital converter | A/C refrigerant pressure sensor/knock sensor (KS)/engine coolant temperature (ECT) sensor/fuel pump monitor circuit short circuit to battery voltage |
| 87 | Engine control module (ECM) -EEPROM | Insecure PROM, incorrectly coded |
| 90 | Torque converter clutch (TCC) -stuck ON | Wiring open circuit/short circuit to ground transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM |
| 96 | Engine control module (ECM) -ignition supply voltage low | Wiring open circuit, alternator, ECM |
| 98 | Engine control module (ECM) -incorrectly coded | ECM incorrectly coded, ECM |
| 99 | Engine control module (ECM) -incorrectly coded | ECM incorrectly coded, ECM |
