| 93-95 2.2L VIN 4 |
|---|
| Flash Code | Fault Location | Probable Cause |
| 12 | Start of diagnosis | No engine speed (RPM) signal received |
| 13 | Oxygen sensor voltage stays between 0.35 and 0.55 volts for 3 seconds during closed loop operation and will set code after 40 seconds for Century. System can go into open loop after 15 seconds. | Wiring open circuit, O2S/HO2S, ECM |
| 14 | Coolant temperature sensor signal indicates a temperature of over 275°
F for 3 seconds. | Wiring short circuit to ground, ECT sensor, ECM |
| 15 | Coolant temperature sensor signal indicates a temperature colder than
-22° F after the engine has been running for 2 minutes. | Wiring open circuit, ECT sensor, ECM |
| 16 | Battery voltage – high or low | Wiring, alternator, ECM |
| 17 | Spark reference circuit | Wiring open circuit/short circuit to ground, ICM, ECM |
| 18 | Camshaft position (CMP) signal/crankshaft position (CKP) signal error | Wiring open circuit/short circuit to ground, CKP sensor, CMP sensor, crankshaft pulley/balancer |
| 19 | Crankshaft position (CKP) sensor intermittent 7x signal | Wiring, CKP sensor, PROM, ECM |
| 21 | TPS voltage was above 2.5 volts for 2 seconds when the MAP sensor signal
showed manifold vacuum to be 15 pounds or more under 1800 RPM. | Wiring open circuit/short circuit to positive, TP sensor, ECM |
| 22 | TPS voltage was under 0.2 volts for 2 seconds when the engine was running. | Wiring open circuit/short circuit to ground, TP sensor, ECM |
| 23 | Inlet ATS signal showed an air temperature of -22° F after the engine
has been running for 1 minute. | Wiring open circuit, IAT sensor, ECM |
| 24 | Throttle position signal was less than 2% with engine speed between 1400
and 4400 RPM and the MAP signal showed low voltage and high manifold vacuum.
Transmission was not in park or neutral. | Wiring open circuit/short circuit to ground, PROM, VSS, ECM |
| 25 | Inlet ATS signal showed an air temperature over 275° F for more than 2
seconds after the engine has been running for 5 minutes and vehicle speed
was greater than 44 MPH. | Wiring short circuit to ground, IAT sensor, ECM |
| 26 | Engine control module quad driver/output driver | Wiring open circuit/short circuit to ground/short circuit to positive, ECM controlled components, ECM (*see below for additional information) |
| 27 | Engine control module quad driver/output driver | Wiring open circuit/short circuit to ground/short circuit to positive, ECM controlled components, ECM (*see below for additional information) |
| 28 | Engine control module quad driver/output driver | Wiring open circuit/short circuit to ground/short circuit to positive, ECM controlled components, ECM (*see below for additional information) |
| 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 | Wiring open circuit/short circuit to ground, incorrectly adjusted, PNP switch, ECM |
| 32 | EGR open command did not change the fuel mixture when the command was
given during off idle operation. EGR opening should cause the mixture to
be slightly richer because of the low oxygen content of exhaust gas. | Wiring open circuit/short circuit to ground, EGR valve, ECM |
| 33 | MAP sensor signal voltage was too high (low vacuum) for at least 5 seconds
when throttle opening was under 2%. | Wiring open circuit/short circuit to positive, hose blocked/leaking, MAP sensor, ECM |
| 34 | MAP sensor signal voltage was too low (high vacuum) when engine speed
was under 1200 RPM or when engine speed was over 1200 RPM with throttle
opening was over 20%. | Wiring open circuit/short circuit to ground, MAP sensor, ECM |
| 35 | Idle speed was over 150 RPM outside the desired engine speed commanded
by the ECM. | Wiring open circuit/short circuit to ground/short circuit to positive, IAC valve, ECM |
| 36 | Shift solenoids (SS) | Wiring open circuit/short circuit to ground, SS |
| 37 | Brake pedal position (BPP) switch for torque converter clutch (TCC) | Wiring open circuit/short circuit to ground, incorrectly adjusted BPP switch, BPP switch, ECM |
| 38 | Brake pedal position (BPP) switch/ torque converter clutch (TCC) | Wiring open circuit/short circuit to ground, supply wire, BPP switch, TCC switch, ECM |
| 39 | Torque converter clutch (TCC) | Wiring open circuit/short circuit to ground, TCC solenoid, BPP switch, cooling fan fuse, transmission mechanical fault, ECM |
| 41 | Camshaft position (CMP) sensor | Wiring open circuit/short circuit to ground, CMP sensor, ICM, ECM |
| 42 | The EST signal did not change when the ECM applied bypass voltage to the
ignition module. | Wiring open circuit/short circuit to ground, ICM, ECM |
| 43 | Knock sensor (KS) | Wiring open circuit/short circuit to ground/short to positive, KS, PROM, ECM |
| 44 | Oxygen sensor voltage was under 0.2 volts for 60 seconds of closed loop
operation. | Wiring short circuit to ground, fuel pressure low, MAP sensor, misfire, fuel contamination, exhaust system leaking, O2S/HO2S, ECM |
| 45 | Oxygen sensor voltage was above specification. Century and Cutlass Ciera
was over 0.75 volts for 50 seconds in a closed loop. Lumina was over 0.7
volts for 30 seconds and throttle angle was between 3% and 45%. | Fuel pressure high, injector(s) leaking, O2S contamination, EVAP canister purge valve, TP sensor, MAP sensor, EGR system, O2S/H2OS, 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 | PROM error. | Insecure PROM, incorrect PROM, ECM |
| 53 | Charging system voltage was greater than 16.9 volts for more than 50 seconds.
Repair charging system. | Wiring open circuit, alternator, ECM |
| 54 | Exhaust gas recirculation (EGR) valve solenoid 2 | Wiring open circuit/short circuit to ground, exhaust system blocked, EGR valve, ECM |
| 55 | Fuel lean monitor – lean during acceleration | Fuel contamination, injector(s) blocked, fuel system, misfire |
| 56 | Engine control module quad driver/output driver | Wiring, ECM controlled components, ECM |
| 57 | Boost control problem | Wiring short circuit to ground, hoses blocked/leaking, boost bypass actuator, boost control solenoid, ECM |
| 58 | Immobilizer control module – fuel enable signal | Incorrect ignition key, wiring open circuit/short circuit to ground/short circuit to positive, immobilizer control module, ECM |
| 59 | Transmission fluid temperature (TFT) sensor -voltage high | Wiring open circuit, TFT sensor, ECM |
| 61 | Cruise control vent solenoid | Wiring open circuit/short circuit to ground/short to positive, cruise control servo, ECM |
| 62 | Cruise control vacuum solenoid | Wiring open circuit/short circuit to ground/short to positive, cruise control servo, ECM |
| 63 | Cruise control servo position sensor – circuit malfunction | Wiring open circuit/short circuit to ground/short to positive, hoses leaking, cruise control servo, ECM |
| 65 | Cruise control servo position sensor – circuit malfunction | Wiring open circuit/short circuit to ground/short to positive, cruise control servo, ECM |
| 66 | A/C refrigerant pressure sensor – circuit malfunction | Wiring open circuit/short circuit to ground/short to positive, A/C refrigerant pressure sensor, ECM |
| 67 | Cruise control switch – circuit malfunction | Wiring open circuit/short circuit to positive, cruise control switch, brake pedal vacuum valve, ECM |
| 68 | Cruise control servo – servo position sensor high | Hoses blocked, brake pedal vacuum valve, cruise control servo, cruise control cable binding |
| 69 | A/C refrigerant pressure switch – engine coolant blower motors | Wiring short circuit to ground, A/C refrigerant pressure switch, 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 |
| 79 | Transmission fluid temperature (TFT) – high | Transmission mechanical fault, towing |
| 80 | Torque converter clutch (TCC) – slipping | Wiring open circuit/short circuit to ground, supply wire, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM |
| 82 | Ignition control module (ICM) – 3X reference circuit malfunction | Wiring open circuit/short circuit to ground, supply wire, CKP signal sensor, ICM, ECM |
| 85 | Engine control module (ECM) – PROM | Insecure PROM, incorrectly coded |
| 86 | Engine control module (ECM) – analogue/digital converter | A/C refrigerant pressure sensro/KS/ECT sensor/fuel pump monitor circuit short circuit to battery voltage |
| 87 | Engine control module (ECM) – PROM error | 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 | Cruise control – power management mode | Hoses blocked, brake pedal vacuum valve, cruise control servo, cruise control cable binding |
