| 93-95 3.4L VIN S |
|---|
| Flash Code | Fault Location | Probable Cause |
| 12 | Start of diagnosis | No engine speed (RPM) signal received |
| 13 | Oxygen sensor (O2S), bank 2 | Wiring open circuit, O2S, 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 | System voltage – signal low | Wiring, alternator |
| 17 | Camshaft position (CMP) sensor – circuit malfunction | Wiring, CMP sensor, mechanical fault, ECM |
| 18 | Injector(s) – circuit malfunction | Wiring, injector(s) |
| 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 | Wiring open circuit, IAT sensor, ECM |
| 24 | Vehicle speed sensor (VSS) | Wiring, VSS, ECM |
| 25 | Intake air temperature (IAT) sensor – high temperature | Wiring short circuit to ground, IAT sensor, ECM |
| 26 | Evaporative emission (EVAP) canister purge valve – open/short circuit | Wiring, EVAP canister purge valve, ECM |
| 27 | Exhaust gas recirculation (EGR) solenoid | Wiring, poor connections, EGR valve, ECM |
| 28 | Transmission range (TR) switch | Wiring open circuit/short circuit to ground/short circuit to positive, TR switch, ECM |
| 29 | Secondary air injection (AIR) pump relay – circuit malfunction | Wiring, AIR pump relay, ECM |
| 32 | Exhaust gas recirculation (EGR) solenoid | Wiring open circuit/short circuit to ground, EGR valve, ECM |
| 33 | Manifold absolute pressure (MAP) sensor – circuit malfunction | Wiring open circuit/short circuit to positive, hose blocked/leaking, MAP sensor, ECM |
| 34 | Manifold absolute pressure (MAP) sensor – circuit malfunction | 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 |
| 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 | Clutch pedal position (CPP) switch | Wiring, incorrectly adjusted, CPP switch, ECM |
| 41 | Ignition control, timing signal – circuit malfunction | Wiring, poor connections, ICM, ECM |
| 42 | Ignition control, bypass signal – circuit malfunction | Wiring, poor connections, ICM, ECM |
| 43 | Knock sensor (KS) | Wiring open circuit/short circuit to ground/short to positive, KS, ECM |
| 44 | Oxygen sensor (O2S), bank 2 – mixture lean | Wiring open circuit/short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, O2S, ECM |
| 45 | Oxygen sensor (O2S), bank 2 – mixture rich | Wiring open circuit, injector(s) leaking, fuel pressure high, EVAP purge valve, TP sensor, O2S, EGR system, ECM |
| 46 | Immobilizer system, code – malfunction | Incorrect key, ECM |
| 47 | Knock control module, removable part in engine control module (ECM) – circuit malfunction | Wiring, poor connection, missing knock control module, ECM |
| 48 | Mass airflow (MAF) sensor – no signal | Wiring, poor connections, MAF sensor, ECM |
| 51 | Engine control module (ECM) – PROM | Insecure PROM, incorrect PROM, ECM |
| 52 | Engine oil temperature sensor – voltage high | Wiring, engine oil temperature sensor, 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) | Ground wiring open circuit, insecure PROM, ECM |
| 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 | A/C system – performance | Refrigerant low, wiring, A/C refrigerant pressure sensor, A/C evaporator temperature sensor, ECM |
| 62 | Engine oil temperature sensor – voltage low | Wiring, engine oil temperature sensor, ECM |
| 63 | Oxygen sensor (O2S), bank 1 | Wiring open circuit, O2S, ECM |
| 64 | Oxygen sensor (O2S), bank 1 – mixture lean | Wiring open circuit/short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, O2S, ECM |
| 65 | Oxygen sensor (O2S), bank 1 – mixture rich | Wiring open circuit, injector(s) leaking, fuel contamination, fuel pressure high, TP sensor, EGR system, EVAP purge valve, O2S, ECM |
| 66 | A/C refrigerant pressure sensor – voltage low | Wiring open circuit/short circuit to ground, A/C refrigerant pressure sensor, ECM |
| 67 | A/C refrigerant pressure sensor – circuit malfunction | Wiring open circuit, A/C refrigerant pressure sensor, ECM |
| 68 | A/C compressor clutch relay – circuit malfunction | Wiring short circuit, A/C compressor clutch relay, ECM |
| 69 | A/C compressor clutch relay – circuit malfunction | Wiring open circuit, A/C compressor clutch relay, ECM |
| 70 | A/C refrigerant pressure sensor – voltage high | Wiring open circuit/short circuit to positive, A/C refrigerant pressure sensor, ECM |
| 71 | A/C evaporator temperature sensor – voltage high | Wiring open circuit/short circuit to positive, A/C evaporator temperature sensor |
| 72 | Vehicle Speed Sensor (VSS) | Wiring open circuit/short circuit to ground, VSS, ECM |
| 73 | A/C evaporator temperature sensor – voltage low | Wiring, poor connections, A/C evaporator temperature sensor |
| 74 | Traction control system (TCS), active signal – malfunction | Wiring short to ground, ABS/TCS, 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 |
| 78 | Engine coolant blower motor relay 2 – circuit malfunction | Wiring open circuit/short circuit to ground/short circuit to positive, engine coolant blower motor relay, ECM |
| 79 | Transmission fluid temperature (TFT) – high | Transmission mechanical fault, towing weight limit exceeded |
| 80 | Torque converter clutch (TCC) – slipping | Wiring open circuit/short circuit to ground, supply wire, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM |
| 81 | Brake pedal position (BPP) switch, torque converter clutch (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 |
| 83 | Reverse gear inhibit solenoid – circuit malfunction | Wiring, reverse gear inhibit solenoid, ECM |
| 84 (Automatic Transmission) | Transmission 3rd-2nd control solenoid – circuit malfunction | Wiring, control solenoid, ECM |
| 84 (Manual Transmission) | 2nd-3rd gear inhibit relay – circuit malfunction | Wiring, inhibit relay, ECM |
| 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/KS/ECT sensor/fuel pump monitor circuit short circuit to battery voltage |
| 87 | Engine control module (ECM), EEPROM – malfunction | Poor connections, incorrect programming, ECM |
| 90 | Torque converter clutch (TCC) – circuit malfunction | Wiring, TCC solenoid, ECM |
| 91 | Skip shift warning lamp – circuit malfunction | Wiring, skip shift warning lamp, ECM |
| 93 | Transmission fluid pressure (TFP) control solenoid – circuit malfunction | Wiring, poor connection, TFP solenoid |
| 95 | Change oil lamp – circuit malfunction | Wiring open circuit/short circuit to ground/short circuit to positive, instrument panel, engine oil life lamp bulb, ECM |
| 96 | Engine control module (ECM) – ignition supply voltage low | Wiring open circuit, alternator, ECM |
| 97 | Engine control module (ECM), vehicle speed sensor (VSS) output signal – circuit malfunction | Wiring, poor connections, ECM |
| 98 | Engine control module (ECM) – incorrectly coded | ECM incorrectly coded, ECM |
| 99 | Engine control module (ECM) – incorrectly coded | ECM incorrectly coded, ECM |
What kind of obd reader/scanner tool is required so that I will be able to see codes from ecm ? I have a 95 3.4l camaro vin S with a aldl connection that has the following pins – 2,4,5,6,8,9 and 16.
OK, as far as I can tell, that’s not an ALDL connector. ALDL was 5, 10, or 12 pins, but you’re describing a 16-pin OBD connector. It looks like a modern OBD2 connector but requires a GM OBD1 scanner. Some forums say Scanmaster is a good tool for this, but that’s a permanent installation. If you can find a scanner compatible with GM OBD1, I think you can jump OBD1 Pin A to OBD2 Pin 5 and OBD1 Pin M to OBD2 Pin 9 to get a data feed.