Fault Codes
FAULT CODES
| Code | Component | Circuit Fault |
|---|---|---|
| 12 | HEI Reference Signal | KOEO (Normal Condition) |
| 13 | Oxygen Sensor (O2) | Open Circuit |
| 14 | Coolant Temperature Sensor (CTS) | High Temp Signal |
| 15 | Coolant Temperature Sensor (CTS) | Low Temp Signal |
| 21 | Throttle Position Sensor (TPS) | Signal Voltage High |
| 22 | Throttle Position Sensor (TPS) | Signal Voltage Low |
| 23 | Manifold Air Temperature (MAT) Sensor | Temp Too Low |
| 24 | Vehicle Speed Sensor (VSS) | Signal Fault |
| 25 | Manifold Air Temperature (MAT) Sensor | Temp Too High |
| 32 | EGR System | System Error |
| 33 | Manifold Absolute Pressure (MAP) | Signal Voltage High (Low Vacuum) |
| 34 | Manifold Absolute Pressure (MAP) | Signal Voltage Low (High Vacuum) |
| 35 | Idle Air Control Valve (IACV) | Idle Speed Signal Error |
| 42 | Electronic Spark Timing (EST) Circuit | Signal Fault |
| 44 | Oxygen Sensor (O2) Circuit | Lean Exhaust Signal |
| 45 | Oxygen Sensor (O2) Circuit | Rich Exhaust Signal |
| 51 | Faulty MEM-CAL | Circuit Fault |
| 53 | System Voltage | Overvoltage Signal |