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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