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.