| 1993 2.2L VIN 4 & 1992-1993 3.3L VIN N |
|---|
| Flash code | Fault location | Probable cause |
| 12 | Start of diagnosis | No engine speed (RPM) signal received |
| 13 | Oxygen sensor (02S) | Wiring open circuit, 02S, ECM |
| 14 | Engine coolant temperature (ECT) sensor – high temperature indicated | Wiring short circuit to ground, ECT sensor, ECM |
| 14 (Cutlass Ciera 2.2L) | Engine coolant temperature (ECT) sensor – circuit malfunction | Wiring open circuit/short circuit to ground/short circuit to positive, ECT sensor, ECM |
| 15 | Engine coolant temperature (ECT) sensor – low temperature indicated | Wiring open circuit, ECT sensor, ECM |
| 16 | Battery voltage – low | Wiring, alternator |
| 21 | Throttle position (TP) sensor – voltage high | Wiring open circuit/short circuit to positive, TP sensor, ECM |
| 21 (Cutlass Ciera 2.2L) | Throttle position (TP) sensor – circuit malfunction | Wiring open circuit/short circuit to ground/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 – circuit malfunction | Wiring open circuit/short circuit to ground/short circuit to positive, IAT sensor, ECM |
| 24 | Vehicle speed sensor (VSS) | Wiring open circuit/short circuit to ground, VSS, ECM |
| 26 | Engine control module (ECM), quad driver/ output driver -circuit malfunction | Wiring, ECM controlled components, ECM |
| 27 | Transmission gear switch, signal circuit 2nd gear | Wiring open circuit/short circuit to ground, 2nd gear switch, ECM |
| 28 | Transmission gear switch signal circuit 3rd gear | Wiring open circuit/short circuit to ground, 3rd gear switch, ECM |
| 29 | Transmission gear switch signal circuit 4th gear | Wiring open circuit/short circuit to ground, 4th gear switch, ECM |
| 31 | Park/neutral position (PNP) switch – malfunction | Wiring short to ground, incorrectly adjusted, PNP switch, ECM |
| 32 | Exhaust gas recirculation (EGR) solenoid | Wiring open circuit/short circuit to ground, supply wire, PNP switch, EGR valve, ECM |
| 33 | Manifold absolute pressure (MAP) sensor – circuit malfunction | Wiring open circuit/short circuit to ground/short circuit to positive, hose blocked/leaking, MAP sensor, ECM |
| 34 | Mass airflow (MAF) sensor – circuit malfunction | Wiring open circuit/short circuit to ground, MAF sensor, ECM |
| 38 | Brake pedal position (BPP) switch | Wiring open circuit/short circuit to ground/short circuit to positive, incorrectly adjusted, BPP switch, ECM |
| 39 | Torque converter clutch (TCC) – circuit malfunction | Wiring open circuit, TCC solenoid, 2nd gear switch, ECM |
| 42 | Ignition control module (ICM) | Wiring open circuit/short circuit to ground, 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) – mixture lean | Wiring open circuit/short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 02S, ECM |
| 45 | Oxygen sensor (02S) – mixture rich | Wiring open circuit, fuel pressure high, injector(s) leaking, 02S, 02S contamination, EVAP canister purge valve, TP sensor, EGR system, ECM |
| 46 | Power steering pressure (PSP) switch – circuit malfunction | Wiring open circuit/short circuit to ground, PSP switch, ECM |
| 48 | Misfire detected | Ignition system, fuel system, O2S |
| 51 | Engine control module (ECM), PROM | Insecure PROM, incorrect PROM, ECM |
| 66 | A/C refrigerant pressure sensor – circuit malfunction | Wiring open circuit/short circuit to ground/short circuit to positive, A/C refrigerant pressure sensor, ECM |
