Service Code Definitions
SERVICE CODE DEFINITIONS
| Codes | Definition |
|---|---|
| 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 interrupted 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 |
| 24 | Air Charge Temperature (ACT) sensor/signal out of range |
| 25 | Knock sensor signal not received by ECA |
| 26 | Mass Air Flow sensor (MAF) signal out of range |
| 27 | Vehicle Speed Sensor (VSS) signal not received (2.3L Turbo MPFI) |
| 28 | Ambient temperature less than 50°F (10°C) |
| 29 | Vehicle Speed Sensor (VSS) not functioning |
| 31 | Pressure Feedback EGR (PFE) circuit open |
| 32 | EGR Control solenoid (EGRC) or EGR Vent solenoid (EGRV) signal failure |
| 33 | EGR valve not operating or sticking |
| 34 | EGR Control solenoid (EGRC) or EGR Vent solenoid (EGRV) signal failure |
| 35 | RPM too low for EGR testing or Pressure Feedback EGR (PFE) 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. (On 5.0L MA SEFI, indicates RH sensor) |
| 42 | Heated Exhaust Gas Oxygen (HEGO) sensor signal rich in closed loop. Excessive fuel pressure or volume (On 5.0L MA SEFI, indicates RH sensor) |
| 43 | Heated Exhaust Gas Oxygen (HEGO) sensor signal lean during WOT test |
| 44 | Air management system (TAB/TAD solenoids) |
| 45 | Thermactor Air Diverter (TAD) system operation |
| 46 | Thermactor Air By-pass (TAB) system operation |
| 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) open/shorted, steering wheel not turned during KOER SELF-TEST |
| 53 | Throttle Position Sensor (TPS) signal circuit short |
| 54 | Air Charge Temperature (ACT) sensor circuit open |
| 55 | Key power check circuit open (CFI engines) |
| 56 | Vane Airflow (VAF) sensor or Mass Air Flow (MAF) sensor, shorted VREF to SIG circuit |
| 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 Temp. (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 |
| 64 | Air Charge Temperature (ACT) sensor circuit short |
| 65 | Did not go to closed loop fuel control on HEGO switching. Faulty HEGO signal |
| 66 | Vane Airflow (VAF) sensor or Mass Air Flow (MAF) sensor, shorted SIG to SIG RTN circuit |
| 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 |
| 72 | Fault in VPWR circuit to EEC power relay |
| 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 |
| 76 | Vane Airflow (VAF) sensor, no voltage signal increase during Dynamic Response Test |
| 77 | ECA request for Dynamic Response Test |
| 78 | Power supply circuit to EEC power relay interrupted |
| 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 (on 5.0L MA SEFI, indicates LH sensor) |
| 92 | Heated Exhaust Gas Oxygen (HEGO) sensor signal rich in closed loop; excessive fuel pressure or volume (on 5.0L MA SEFI, indicates LH sensor) |
| 93 | Throttle linkage, DC motor idle speed control/idle tracking switch and Throttle Position Sensor (TPS) (1.9L & 2.5L CFI) |
| 94 | Air management system (TAB/TAD solenoids) |
| 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 |