| Model | Year | Engine identification | System |
|---|---|---|---|
| Fleetwood 5.7L | 1993-95 | VIN position 8 = 7/P | GM |
General information
- Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
- ECM operates in backup mode if sensors fail, to enable vehicle to be driven to repair shop.
- Trouble codes can be displayed by the MIL, the AlC control panel, or by using a Scan Tool connected to the data link connector (OLC).
Accessing
Without using A/C control panel
- Access data link connector (DLC).
- Jump data link connector (DLC) terminals A and B [1].
- Switch ignition ON. D0 NOT start engine.
- MIL should flash.
- Long flashes indicate the ‘tens’ of the trouble code [2] [A].
- Short flashes indicate the ‘units’ of the trouble code [2] [C].
- A short pause separates each flash [2] [B].
- A long pause separates each trouble code [2] [D].
- For example: Trouble code 12 displayed [2] .
- Trouble code 12 will be displayed 3 times.
- Each trouble code will be displayed three times.
- If no trouble codes are stored, code 12 will continue to be displayed.
- Trouble codes can also be displayed by using a Scan Tool connected to the data link connector (DLC) [1], located below center of fascia near SRS control module.
Using A/C control panel
- Switch ignition ON.
- Simultaneously press and hold ‘OFF’ and ‘TEMP UP’ buttons [3]- [1] & [2].
- When all segments of the display H [3]-3 illuminate: Release the ‘OFF’ and ‘TEMP UP’ buttons [3]- [1] & [2].
- Parameter number ‘-00’ (ECM codes) will be displayed [3] 3.
- Press and release the ‘OUT TEMP’ button [3] 4.
- Buttons ‘FAN SPEED UP’ and ‘FAN SPEED DOWN’ [3] 5 increase or decrease the parameter numbers.
- Display will alternate between ECM parameter number ‘-00’ and the trouble code at 1.6 second intervals [3] 3.
- Trouble codes will be displayed in ascending order.
- Cycle will be repeated after all ECM trouble codes have been displayed.
- If no ECM trouble codes are stored, trouble code ’00’ will be displayed.
- To end diagnosis:
- Press the ‘AUTO’ button [3] 6 .
Erasing
Without using A/C control panel
- Ensure ignition switched OFF.
- Disconnect battery ground cable for 30 seconds.
- Reconnect battery ground cable.
- Repeat checking procedure to ensure no trouble codes remain in ECM fault memory.
NOTE: Disconnecting battery ground lead may also erase memory from electronic units, such as radio.
• Trouble codes can also be erased by using a Scan Tool connected to the data link connector (DLC) [1].Using A/C control panel
- Access ECM trouble codes.
- During trouble code display:
o Press and hold ‘OFF’ [3] 2.
• When ’00’ is displayed [3] 3:
o Release the ‘OFF’ button [3] 2.
• To end diagnosis:
o Press the ‘AUTO’ button [3] 5.
Trouble code identification
| Trouble code | Fault location | Probable cause |
| 00 [1] | No fault found | – |
| 11 | Malfunction indicator lamp (MIL) -circuit malfunction | Wiring open circuit/short circuit to ground/ short circuit to positive, MIL bulb, supply wire, ECM |
| 12 | Start of diagnosis | No RPM signal received |
| 13 [2] | Oxygen sensor (02S) | Wiring open circuit, 025, ECM |
| 13 [3] | Heated oxygen sensor (H02S), bank 1 circuit malfunction | Wiring open circuit, 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 | Ignition system -low resolution pulse | Wiring open circuit/short circuit to ground/ short circuit to positive, distributor, ECM |
| 18 | Injector(s) -circuit malfunction | Wiring open circuit/short circuit to ground/ short circuit to ground, supply wire, injectors, ECM |
| 21 | Throttle position (TP) sensor -voltage high | Wiring open circuit/short circuit to positive, TP sensor, TP sensor interface module, ECM |
| 22 | Throttle position (TP) sensor -voltage low | Wiring open circuit/short circuit to ground, TP sensor, TP sensor interface module, ECM |
| 23 | Intake air temperature (IAT) sensor -low temperature indicated | Wiring open circuit, IAT sensor, ECM |
| 24 | Vehicle speed sensor (VSS) | Wiring open circuit/short circuit to ground, VSS, VSS buffer module, park neutral position circuit, ECM |
| 25 | Intake air temperature (IAT) sensor -high temperature indicated | Wiring short circuit to ground, IAT sensor, ECM |
| 26 [2] | Engine control module (EeM) quad driver! output driver | Wiring open circuit/short circuit to ground/ short circuit to positive, ECM controlled components, ECM a |
| 26 [3] | Evaporative emission (EVAP) canister purge valve -circuit malfunction | Wiring open circuit/short circuit to ground/ short circuit to positive, supply wire, EVAP canister purge valve, ECM |
| 27 | Exhaust gas recirculation (EGR) vacuum control -circuit malfunction | Wiring open circuit/short circuit to ground/ short circuit to positive, EGR valve, ECM |
| 28 | Transmission range (TR) pressure switch | Wiring open circuit/short circuit to ground, ECM |
| 29 | Secondary air injection (AIR) system | Wiring open circuit/short circuit to ground/ short circuit to positive, AIR valve relay, ECM |
| 32 | Exhaust gas recirculation (EGR) solenoid | Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM, hoses blocked/leaking, exhaust system blocked |
| 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 |
| 36 | Ignition system high resolution or extra low resolution pulse -circuit malfunction | Wiring open circuit/short circuit to ground! short circuit to positive, distributor, ECM |
| 37 | Brake switch stuck ON | Wiring open circuit/short circuit to ground! short circuit to positive, brake switch, ECM |
| 38 | Brake switch stuck OFF | Wiring open circuit/short circuit to ground! short circuit to positive, brake switch, ECM |
| 41 | Ignition control module (leM) -electronic spark timing (EST)!ignition control (Ie) circuit malfunction | Wiring open circuit, 01 control module, ECM |
| 42 | Ignition control module (ICM) -electronic spark timing (EST)/ignition control (IC)/bypass circuit malfunction | Wiring open circuit/short circuit to ground, 01 control module, ECM |
| 43 | Knock sensor (KS) | Wiring open circuit/short circuit to ground/ short circuit to positive, KS, insecure PROM, ECM |
| 44 [2] | Oxygen sensor (02S) mixture lean | Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, MAP sensor, 02S, ECM |
| 44 [3] | Heated oxygen sensor (H02S). bank 1 mixture lean | Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, secondary air system, H02S, ECM |
| 45 [2] | Oxygen sensor (02S) mixture rich | Wiring open circuit, fuel pressure high, injector(s) leaking, EVAP canister purge valve, TP sensor, MAP sensor, ECM |
| 45 [3] | Heated oxygen sensor (H02S), bank 1 mixture rich | Wiring open circuit, fuel pressure high, fuel pressure regulator, injector(s) leaking, EVAP canister purge valve, TP sensor, EGR system,H02S, MAF sensor, 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 |
| 47 | Knock sensor (KS) -circuit malfunction | Insecure PROM, ECM |
| 48 | Mass air flow (MAF) sensor -circuit malfunction | Wiring open circuit/short circuit to ground/ short circuit to positive, MAF sensor, ECM |
| 50 | System voltage low | Wiring open circuit/short circuit to ground, alternator, ECM |
| 51 [2] | Engine control module (ECM) -PROM | Insecure PROM, incorrect PROM, ECM |
| 51 [3] | Engine control module (ECM) -EEPROM | Insecure EEPROM, incorrect EEPROM, ECM |
| 53 | System voltage high | Alternator, ECM |
| 54 | Fuel pump circuit -voltage low | Wiring open circuit/short circuit to ground, fuel pump relay, engine oil pressure warning lamp switch, fuel pump, ECM |
| 55 | Engine control module (ECM). fuel lean monitor | Fuel filter/lines blocked, fuel pump |
| 58 | Transmission fluid temperature (TFT) sensor high temperature indicated | Wiring short circuit to ground, TFT sensor, ECM |
| 59 | Transmission fluid temperature (TFT) sensor lowtemperature indicated | Wiring open circuit, TFT sensor, ECM |
| 63 | Heated oxygen sensor (H02S). bank 2 -opencircuit | Wiring open circuit/short circuit to ground/ short circuit to positive, H02S, ECM |
| 64 | Heated oxygen sensor (H02S), bank 2 mixture lean | Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, secondary air system, ECM |
| 65 | Heated oxygen sensor (H02S), bank 2 mixture rich | Fuel pressure high, injector(s) leaking, EVAP canister purge valve, TP sensor, EGR system, H025 contamination, MAF sensor, ECM |
| 66 | Ale refrigerant pressure sensor circuit -open or short circuit | Wiring open circuit/short circuit to ground/ short circuit to positive, AlC refrigerant pressure sensor, ECM |
| 67 | Ale refrigerant pressure sensor circuit -circuit malfunction | Wiring open circuit/short circuit to ground/ short circuit to positive, AlC refrigerant pressure sensor |
| 68 | Ale compressor clutch relay -circuit malfunction | Wiring short circuit to ground!short circuit to positive, AlC compressor clutch relay, ECM |
| 69 | Ale compressor clutch -circuit malfunction | Wiring open circuit, AlC compressor clutch relay, ECM |
| 70 | Ale compressor clutch relay -circuit malfunction | Wiring open circuit/short circuit to ground/ short to positive, AlC compressor clutch relay, ECM |
| 72 | Vehicle speed sensor (VSS) -circuit malfunction | Wiring open circuit, V55, ECM |
| 73 | Pressure control solenoid -circuit malfunction | Wiring open circuit/short circuit to ground/ short to positive, ECM |
| 74 | Traction control system (TeS), circuit malfunction | Wiring short circuit to ground, ABS control module trouble code(s) stored, ECM |
| 75 | Transmission system -voltage low | Supply wire, alternator, ECM |
| 77 | Engine coolant blower motor relay 1 -circuit malfunction | Wiring open circuit/short circuit to ground/short circuit to positive, engine coolant blower motor relay, ECM |
| 78 | Engine coolant blower motor relay 2 -circuitmalfunction | Wiring open circuit/short circuit to ground! short circuit to positive, engine coolant blower motor relay, ECM |
| 79 | Transmission fluid -overtemp | Wiring open circuit/short circuit to ground, TFT sensor, ECM |
| 81 | Transmission shift solenoid (SS), 2nd-3rd circuit malfunction | Wiring open circuit/short circuit to ground, 55, ECM |
| 82 | Transmission shift solenoid (SS), 1st-2nd circuit malfunction | Wiring open circuit/short circuit to ground, 55, ECM |
| 83 | Torque converter clutch (Tee) solenoid, pulse width modulated -circuit malfunction | Wiring open circuit/short circuit to ground/ short circuit to positive, TCC solenoid, ECM |
| 84 | Transmission shift solenoid (55), 3rd-2nd circuit malfunction | Wiring open circuit/short circuit to ground, 55, ECM |
| 85 | Torque converter clutch (Tee) stuck ON | Wiring open circuit/short circuit to ground, transmission mechanical fault, TCC solenoid |
| 90 | Transmission Tee solenoid -circuit malfunction | Wiring open circuit/short circuit to ground, TCC solenoid, ECM |
| 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 oil level warning lamp -circuit malfunction | Wiring open circuit/short circuit to ground/ short circuit to positive, instrument panel, engine oil level lamp bulb, oil level sensor, ECM |
| 97 | Vehicle speed sensor (VSS) -circuit malfunction | Wiring open circuit/short circuit to ground/ short circuit to positive, VSS, ECM |
[1] Code 00 is displayed when accessing trouble codes with the A/C control panel.
[2]Except 5.7L 1994-95 D
[3] 5.7L 1994-95
[4] Depending on model, year and equipment level, the following components may be connected to this circuit.
Use of the vehicle wiring diagram is recommended to confirm which components are fitted.
o NC compressor clutch relay
o NC condenser blower motor relay
o Engine coolant blower motor relay
o Engine coolant ‘hot’ warning lamp
o Evaporative emission (EVAP) canister purge valve
o Exhaust gas recirculation (EGR) solenoid
o Malfunction indicator lamp (MIL)
o Torque converter clutch (Tee) solenoid
o Transmission shift solenoids (SS)
o Transmission shift warning lamp (MT)