| 92-93 3.1, 3.4L VIN T/M, X |
| Flash Code |
Fault Location |
Probable Cause |
| 12 |
Start of diagnosis |
No engine speed (RPM) signal received |
| 13 |
Oxygen sensor (O2S)/heated oxygen sensor (HO2S) |
Wiring open circuit, O2S/HO2S, ECM |
| 14 |
Engine coolant temperature (ECT) sensor – voltage high/low |
Wiring, ECT sensor, ECM |
| 15 |
Engine coolant temperature (ECT) sensor – voltage high |
Wiring open circuit, ECT sensor, ECM |
| 16 |
System voltage – high/low |
Wiring, battery, alternator |
| 17 |
Camshaft position (CMP) sensor – circuit malfunction |
Wiring, CMP sensor, mechanical fault, ECM |
| 19 |
Crankshaft position (CKP) sensor, 7X/58X signal – circuit malfunction |
Wiring, CKP sensor, ECM |
| 21 |
Throttle position (TP) sensor – voltage high/low |
Wiring, 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 – voltage high/low |
Wiring, IAT sensor, ECM |
| 24 |
Vehicle speed sensor (VSS) – no signal |
Wiring, VSS, ECM |
| 25 |
Intake air temperature (IAT) sensor – voltage low |
Wiring short circuit to ground, IAT sensor, ECM |
| 26 |
Engine control module (ECM), quad driver/output driver – circuit malfunction |
Wiring, ECM controlled components, ECM |
| 27 |
Engine control module (ECM), quad driver/output driver – circuit malfunction |
Wiring, ECM controlled components, ECM |
| 28 |
Engine control module (ECM), quad driver/output driver – circuit malfunction |
Wiring, ECM controlled components, ECM |
| 29 |
Engine control module (ECM), quad driver/output driver – circuit malfunction |
Wiring, ECM controlled components, ECM |
| 31 |
Transmission range (TR) switch – malfunction |
Wiring, TR switch, ECM |
| 32 |
Exhaust gas recirculation (EGR) solenoid |
Wiring, poor connections, EGR valve, ECM |
| 33 |
Manifold absolute pressure (MAP) sensor – voltage high/low |
Wiring, hose blocked/leaking, MAP sensor, ECM |
| 34 |
Manifold absolute pressure (MAP) sensor – voltage low |
Wiring open circuit/short circuit to ground, MAP sensor, ECM |
| 35 |
Idle air control (IAC) valve |
Wiring, IAC valve, intake system leaking, fuel system, PCV valve, A/C system, mechanical fault, ECM |
| 36 |
Crankshaft position (CKP) sensor, at crankshaft pulley – 24X signal circuit malfunction |
Wiring, CKP sensor, ECM |
| 39 |
Clutch pedal position (CPP) switch |
Wiring, incorrectly adjusted, CPP switch, ECM |
| 41 |
Engine control module (ECM), programming – malfunction |
ECM incorrect programming, ECM failure |
| 42 |
Ignition control, timing signal – circuit malfunction |
Wiring, poor connections, ICM, ECM |
| 43 |
Knock sensor (KS) – circuit malfunction |
Wiring, KS, ECM |
| 44 |
Oxygen sensor (O2S)/heated oxygen sensor (HO2S) – mixture lean |
Wiring short circuit to ground, fuel pressure low, MAP sensor, misfire, fuel contamination, exhaust system leaking, O2S/HO2S, ECM |
| 45 |
Oxygen sensor (O2S)/heated oxygen sensor (HO2S) – mixture rich |
Fuel pressure high, injector(s) leaking, O2S contamination, EVAP canister purge valve, TP sensor, MAP sensor, EGR system, O2S/H2OS, ECM |
| 46 |
Immobilizer system, code – malfunction |
Incorrect key, ECM |
| 51 |
Engine control module (ECM) – PROM |
Poor connections, incorrect programming, ECM |
| 52 |
Engine control module (ECM) – malfunction |
ECM |
| 53 |
System Voltage – high |
Alternator |
| 54 |
Fuel pump circuit – voltage low |
Wiring open circuit/short circuit to ground, fuel pump relay, fuel pump, engine oil pressure warning lamp switch, ECM |
| 55 |
Engine control module (ECM) – malfunction |
ECM |
| 61 |
Oxygen sensor (O2S) – malfunction |
O2S |
| 62 |
Transmission gear switch signal circuit |
Wiring open circuit/short circuit to ground, 2nd gear switch, 3rd gear switch, ECM |
| 65 |
Injector(s) – circuit malfunction |
Wiring, injector(s) |
| 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 |
CAN data bus, ECM to instrumentation control module – lost communication |
Wiring, poor connections, instrumentation control module, ECM |
| 75 |
Exhaust gas recirculation (EGR) solenoid 1 – circuit malfunction |
Wiring, EGR valve, ECM |
| 76 |
Exhaust gas recirculation (EGR) solenoid 2 – circuit malfunction |
Wiring, EGR valve, ECM |
| 77 |
Exhaust gas recirculation (EGR) solenoid 3 – circuit malfunction |
Wiring, EGR valve, ECM |
| 79 |
Vehicle speed sensor (VSS) – voltage high |
Wiring, VSS, ECM |
| 80 |
Vehicle speed sensor (VSS) – voltage high |
Wiring, VSS, ECM |
| 81 |
Brake pedal position (BPP) switch, TCC – circuit malfunction |
Wiring, BPP switch, ECM |
| 82 |
Crankshaft position (CKP) sensor, in cylinder block – 3X signal circuit malfunction |
Wiring open circuit/short circuit to ground, CKP sensor, ICM |
| 85 |
Engine control module (ECM), PROM – malfunction |
Poor connections, incorrect programming, ECM |
| 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 – malfunction |
Poor connections, incorrect programming, ECM |
