GM GM 94-95 3.1L VIN M Trouble Code Info

GM

94-95 3.1L VIN M
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
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 Engine control module quad driver/output driver Wiring, ECM controlled components, ECM
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
41 Ignition control module (lCM) -circuit malfunction Wiring open circuit, ignition control module (ICM), 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
55 Fuel system -lean during acceleration Fuel filter, fuel pump, H02S, injectors
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
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, 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