Oldsmobile OBD/OBD2 Codes >> Eighty Eight – Ninety Eight/Regency – Silhouette – Toronado/Trofeo (1992 – 1993)

ModelYearEngine identificationSystem
Eighty Eight 3.8L1992-93VIN  position 8 =  L  GM
Ninety Eight/Regency 3.8L1992-93VIN  position 8 =  L  GM
Silhouette 3.8L1992-93VIN  position 8 =  LGM
Toronado/Trofeo 3.8L1992VIN  position 8 =  LGM

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 (some models), or by using a Scan Tool connected to the data link connector (DLC).

Accessing

• Access data link connector (DLC):
o Toronado/Trofeo  1
o Except Toronado/Trofeo  2
  • Jump data link connector (DLC) terminals A and B.
  • Switch ignition ON. 00 NOT start engine.
  • Count MIL flashes. Note trouble codes. Compare with trouble code table.
  • Firstly trouble code 12 will be displayed 3 times.
  • Trouble codes consist of 2 groups, displayed as follows:
o First group indicates the ‘tens’ of the trouble code [3] [A].
o Second group indicates the ‘units’ of the trouble code [3] [C].
o A short pause separates each group [3] [B].
o A long pause separates each trouble code D [D].
o For example: Trouble code 12 displayed [3]. Start of diagnosis.
• Each additional trouble code will now be displayed 3 times, in ascending order.
NOTE: If no additional 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).

Erasing

NOTE: Disconnecting battery ground lead may cause driveability problems until the engine management system relearns basic values.
  • 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)

Trouble code  identification

Flash codeFault locationProbable cause
12Start of diagnosisNo engine speed (RPM) signal received
13Oxygen sensor (02S)Wiring open circuit, oxygen sensor (025), ECM
14Engine coolant temperature (ECT) sensor high temperature indicatedWiring short circuit to ground, ECT sensor, ECM
15Engine coolant temperature (ECT) sensor low temperature indicatedWiring open circuit, ECT sensor, ECM
16Battery voltage highllowWiring, alternator
17Spark reference circuitWiring open circuit/short circuit to ground, ICM,ECM
18Camshaft pOSition (CMP) signal/fuel control signalWiring open circuit/short circuit to ground, CKP sensor, CMP sensor, ICM, ECM
21Throttle position (TP) sensor -voltage highWiring open circuit/short circuit to positive, TP sensor, ECM
22Throttle position (TP) sensor -voltage lowWiring open circuit/short circuit to ground, TPsensor, ECM
23Intake air temperature (IAT) sensor -low temperature indicatedWiring open circuit, IAT sensor, ECM
24Vehicle speed sensor (VSS)Wiring open circuit/short circuit to ground, V55, ECM
25Intake air temperature (IAT) sensor -high temperature indicatedWiring short circuit to ground, IAT sensor, ECM
26Engine control module (ECM) quad driver! output driverWiring, ECM controlled components, ECM 0
31Park/neutral pOSition (PNP) switchWiring short circuit to ground, incorrectly adjusted,PNP switch, ECM
32Exhaust gas recirculation (EGR) solenoidWiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
34Mass air flow (MAF) sensorWiring open circuit/short circuit to ground! short circuit to positive, MAF sensor, ECM
36Shift solenoids (SS)Wiring open circuit/short circuit to ground, 55
38Brake pedal position (BPP) switchWiring open circuit/short circuit to ground! shortcircuit to positive, BPP switch incorrectly adjusted, BPP switch, ECM
39Torque converter clutch (TCC)Wiring open circuit/short circuit to ground, TCC solenoid, BPP switch incorrectly adjusted,transmission mechanical fault, ECM
41Camshaft position (CMP) sensorWiring, CMP sensor, mechanical fault, ECM
42Ignition control module (ICM) -circuit malfunctionWiring open circuit/short circuit to ground, ICM, ECM
43Knock sensor (KS)Wiring open circuit/short circuit to ground! short circuit to positive, K5 incorrectly fitted, K5, insecure PROM, ECM
44Oxygen sensor (02S) -mixture leanWiring open circuit/short circuit to ground,injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 025, ECM
45Oxygen sensor (02S) -mixture richWiring open circuit, fuel pressure high, injector(s) leaking, 025 contamination, EVAP canister purge valve, TP sensor, EGR system, 025, ECM
51Engine control module (ECM) -PROMInsecure PROM, incorrect PROM, ECM
53Exhaust gas recirculation (EGR) valve solenoid 1Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
54Exhaust gas recirculation (EGR) valve solenoid 2Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
55Exhaust gas recirculation (EGR) valve solenoid 3Wiring open circuit/short circuit to ground, supplywire, EGR valve, ECM
56Engine control module (ECM) quad driver! outputdriverWiring, ECM controlled components, ECM 0
58Immobilizer control module -fuel enable signalIncorrect ignition key, wiring open circuit/ shortcircuit to ground!short circuit to positive, immobilizer control module, ECM
61Cruise control vent solenoidWiring open circuit/short circuit to ground! shortcircuit to positive, cruise control vent solenoid,cruise control servo, ECM
62Cruise control vacuum solenoidWiring open circuit/short circuit to ground! shortcircuit to positive, cruise control vacuum solenoid, cruise control servo, ECM
63Cruise control servo -servo position sensor lowHoses leaking, cruise control servo
65Cruise control servo position sensor circuit malfunctionWiring open circuit/short circuit to ground/ short circuit to positive, cruise control servo, ECM
66Low AlC refrigerant chargeLow AlC refrigerant charge, wiring open circuit/short circuit to ground/short circuit to positive, AlC refrigerant low pressure switch, ECM
67Cruise control switch -circuit malfunctionWiring open circuit/short circuit to ground/ short circuit to positive, cruise control switch, ECM
68Cruise control servo -servo position sensor highHoses blocked/leaking, brake pedal vacuum valve, cruise control servo
69Ale refrigerant pressure switch -engine coolant blower motorsWiring open circuit, AlC refrigerant pressure switch, ECM
99Cruise control -power management modeCruise control accelerator cable adjustment, hoses blocked, brake pedal vacuum valve, cruise control servo