Oldsmobile Eighty Eight – Ninety Eight/Regency – Silhouette – Toronado/Trofeo (1992 – 1993) Trouble Code Info

Model Year Engine identification System
Eighty Eight 3.8L 1992-93 VIN  position 8 =  L   GM
Ninety Eight/Regency 3.8L 1992-93 VIN  position 8 =  L   GM
Silhouette 3.8L 1992-93 VIN  position 8 =  L GM
Toronado/Trofeo 3.8L 1992 VIN  position 8 =  L GM

General information

  • Refer to the front of this manual for general test conditions, terminology, detailed descriptions of wiring faults and a general trouble shooter for electrical and mechanical faults.
  • 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). Eighty-Eight1Eighty-Eight2

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.
Eighty-Eight3 • Trouble codes can also be erased by using a Scan Tool connected to the data link connector (DLC)

Trouble code  identification

Flash code Fault location Probable cause
12 Start of diagnosis No engine speed (RPM) signal received
13 Oxygen sensor (02S) Wiring open circuit, oxygen sensor (025), 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 highllow Wiring, alternator
17 Spark reference circuit Wiring open circuit/short circuit to ground, ICM,ECM
18 Camshaft pOSition (CMP) signal/fuel control signal Wiring open circuit/short circuit to ground, CKP sensor, CMP sensor, ICM, 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, TPsensor, 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, V55, ECM
25 Intake air temperature (IAT) sensor -high temperature indicated Wiring short circuit to ground, IAT sensor, ECM
26 Engine control module (ECM) quad driver! output driver Wiring, ECM controlled components, ECM 0
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
34 Mass air flow (MAF) sensor Wiring open circuit/short circuit to ground! short circuit to positive, MAF sensor, ECM
36 Shift solenoids (SS) Wiring open circuit/short circuit to ground, 55
38 Brake pedal position (BPP) switch Wiring open circuit/short circuit to ground! shortcircuit to positive, BPP switch incorrectly adjusted, BPP switch, ECM
39 Torque converter clutch (TCC) Wiring open circuit/short circuit to ground, TCC solenoid, BPP switch incorrectly adjusted,transmission mechanical fault, ECM
41 Camshaft position (CMP) sensor Wiring, CMP sensor, mechanical fault, ECM
42 Ignition control module (ICM) -circuit malfunction Wiring open circuit/short circuit to ground, ICM, ECM
43 Knock sensor (KS) Wiring open circuit/short circuit to ground! short circuit to positive, K5 incorrectly fitted, K5, insecure PROM, ECM
44 Oxygen sensor (02S) -mixture lean Wiring open circuit/short circuit to ground,injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 025, ECM
45 Oxygen sensor (02S) -mixture rich Wiring open circuit, fuel pressure high, injector(s) leaking, 025 contamination, EVAP canister purge valve, TP sensor, EGR system, 025, ECM
51 Engine control module (ECM) -PROM Insecure PROM, incorrect PROM, ECM
53 Exhaust gas recirculation (EGR) valve solenoid 1 Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
54 Exhaust gas recirculation (EGR) valve solenoid 2 Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
55 Exhaust gas recirculation (EGR) valve solenoid 3 Wiring open circuit/short circuit to ground, supplywire, EGR valve, ECM
56 Engine control module (ECM) quad driver! outputdriver Wiring, ECM controlled components, ECM 0
58 Immobilizer control module -fuel enable signal Incorrect ignition key, wiring open circuit/ shortcircuit to ground!short circuit to positive, immobilizer control module, ECM
61 Cruise control vent solenoid Wiring open circuit/short circuit to ground! shortcircuit to positive, cruise control vent solenoid,cruise control servo, ECM
62 Cruise control vacuum solenoid Wiring open circuit/short circuit to ground! shortcircuit to positive, cruise control vacuum solenoid, cruise control servo, ECM
63 Cruise control servo -servo position sensor low Hoses leaking, cruise control servo
65 Cruise control servo position sensor circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, cruise control servo, ECM
66 Low AlC refrigerant charge Low AlC refrigerant charge, wiring open circuit/short circuit to ground/short circuit to positive, AlC refrigerant low pressure switch, ECM
67 Cruise control switch -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, cruise control switch, ECM
68 Cruise control servo -servo position sensor high Hoses blocked/leaking, brake pedal vacuum valve, cruise control servo
69 Ale refrigerant pressure switch -engine coolant blower motors Wiring open circuit, AlC refrigerant pressure switch, ECM
99 Cruise control -power management mode Cruise control accelerator cable adjustment, hoses blocked, brake pedal vacuum valve, cruise control servo