Code Definitions
- 11: System "Passes" test procedure.
- 12: Idle RPM not within specifications.
- 13: Idle Speed Control (ISC) RPM too high.
- 14: Erratic ignition signal from PIP.
- 15: Power interruption to Keep Alive Memory (KAM), Pin No. 1.
- 16: Idle Speed Control (ISC) RPM too high or throttle pedal touched during KOER SELF-TEST.
- 17: Idle Speed Control (ISC) RPM too low.
- 18: Spark timing incorrect.
- 19: Idle Speed Control (ISC) RPM too low,
- 21: Engine Coolant Temperature (ECT) sensor/signal out of range.
- 22: Manifold Absolute Pressure (MAP) sensor/signal out of range.
- 23: Throttle Position Sensor (TPS) signal/out of range.
- 28: Ambient temperature less than 50°F (10°C).
- 29: Vehicle Speed Sensor (VSS) not functioning.
- 31: EGR circuit open.
- 32: EGR Control solenoid (EGRC) signal failure.
- 33: EGR valve not operating or sticking.
- 34: EGR Control solenoid (EGRC) signal failure.
- 35: RPM too low for EGR testing or EGR circuit short.
- 38: Idle Tracking Switch (ITS) sticking or open in signal circuit.
- 39: Converter by-pass clutch not operating correctly.
- 41: Heated Exhaust Gas Oxygen (HEGO) sensor, lean signal in closed loop.
- 42: Heated Exhaust Gas Oxygen (HEGO) sensor signal rich in closed loop. Excessive fuel pressure or volume.
- 43: Heated Exhaust Gas Oxygen (HEGO) sensor signal lean during WOT test.
- 47: Idle speed control (by-pass Air), low flow of unmetered air.
- 48: Idle speed control (by-pass Air), high flow of unmetered air.
- 51: Engine Coolant Temperature (ECT) sensor, signal circuit open.
- 52: Power Steering Pressure Switch (PSPS) signal open or shorted, steering wheel not turned during KOER SELF-TEST.
- 53: Throttle Position Sensor (TPS) signal circuit short.
- 55: Key power check circuit open (CFI engines).
- 57: Neutral Pressure Switch (NPS) failed in neutral.
- 58: Vane Air Temperature (VAT) sensor circuit open.
- 59: Transmission Hydraulic Switch (THS), 4/3 pressure switch, failed in open position.
- 61: Engine Coolant Temperature (ECT) sensor, signal circuit short.
- 62: Transmission Hydraulic Switch (THS) 4/3 pressure switch failed in closed position.
- 63: Throttle Position Sensor (TPS) signal circuit open.
- 65: Did not go to closed loop fuel control on HEGO switching. Faulty HEGO signal.
- 67: Neutral Drive Switch (NDS), A/C input, Neutral Pressure Switch (NPS) signal interrupted.
- 68: Vane Air Temperature (VAT) sensor circuit short.
- 69: Transmission Hydraulic Switch (THS) 3/2 pressure switch failed in closed position.
- 71: Idle Tracking Switch (ITS) shorted to ground or stuck closed.
- 73: Throttle Position Sensor (TPS) did not rotate more than 25% during dynamic response test.
- 74: Brake On/Off (BOO) switch always open or not applied during KOER SELF-TEST.
- 75: Brake On/Off (BOO) switch always closed, or signal circuit shorted.
- 77: ECA request for Dynamic Response Test.
- 79: Neutral Drive Switch (NDS), A/C input, Neutral Position Switch (NPS) signal interrupted.
- 81: Open or shorted signal from turbo boost solenoid.
- 82: Integrated Controller Relay Module (ICRM), electric fan processor signal shorted to ground or open.
- 83: Integrated Controller Relay Module (ICRM), high speed electric fan processor signal shorted to ground or open.
- 84: EGR Valve Regulator (EVR) resistance signal out of range.
- 85: Fuel mixture made leaner (Adaptive Fuel) to accommodate canister purge function or excessive fuel pressure or volume.
- 86: Fuel mixture made richer (Adaptive Fuel) due to low fuel pressure or low volume.
- 87: Open in fuel pump circuit or VPWR circuit between EEC power relay and fuel pump relay.
- 88: Integrated Controller Relay Module (ICRM), electric fan processor signal shorted to ground or open.
- 89: Converter by-pass clutch solenoid always open or closed.
- 91: Heated Exhaust Gas Oxygen (HEGO) sensor, lean signal in closed loop.
- 92: Heated Exhaust Gas Oxygen (HEGO) sensor signal rich in closed loop. Excessive fuel pressure or volume.
- 93: Throttle linkage, DC motor idle speed control/idle tracking switch and Throttle Position Sensor (TPS)
- 95: Inertia switch or fuel pump circuit shorted or open.
- 96: No power to fuel pump relay.
- 98: Vehicle did not pass KOEO SELF-TEST. Code 11 necessary to proceed with KOER test.
- 99: ECA has not stored enough information to control idle speed.