Trouble Code Charts
TROUBLE CODE IDENTIFICATION CHART
| Code No. | System Affected | Probable Cause |
|---|---|---|
| 12 | System Normal | System Normal |
| 13 | Oxygen Sensor Circuit | Sensor or Sensor Circuit, ECM |
| 14 | Shorted Coolant Temperature Sensor | Temp. Sensor or Sensor Circuit, ECM |
| 15 | Open Coolant Temperature Sensor | Temp. Sensor or Sensor Circuit, ECM |
| 21 | Throttle Valve Switch (Idle & Full Throttle) | Switch or Switch Circuit, ECM |
| 22 | Starter Signal | Wiring Circuit, ECM |
| 23 | Power Transistor Circuit | Transistor or Circuit, ECM |
| 25 | Pressure Regulator VSV | VSV or Circuit, ECM |
| 26, 27 | Canister Purge VSV | VSV or Circuit, ECM |
| 32 | EGR System Malfunction | EGR Valve, Backpressure Transducer, Vacuum Switching Valve |
| 33 | Fuel Injector Circuit (Open or Grounded) | Wiring, Dropping Resistor, ECM |
| 34 | EGR Gas Temperature Sensor | Sensor or Sensor Circuit, ECM |
| 35 | Power Transistor Circuit | Transistor or Circuit, ECM |
| 41 | Crank Angle Sensor Signal | Sensor or Sensor Circuit, ECM |
| 43 | Throttle Valve Switch (Idle Position) | Switch or Switch Circuit, ECM |
| 44, 45 | Oxygen Sensor Lean/Rich Fuel Mixture | Injectors, Fuel Pressure, Airflow Sensor, Oxygen Sensor & Wiring, Coolant Temperature Sensor, ECM |
| 51 | Faulty ECM ROM | Defective ECM |
| 52 | Faulty ECM RAM | Defective ECM |
| 53 | Pressure Regulator VSV | VSV or Circuit, ECM |
| 54 | Power Transistor Circuit | Transistor or Circuit, ECM |
| 61, 62 | Airflow Sensor Signal | Sensor or Sensor Circuit, ECM |
| 63 | Vehicle Speed Sensor Signal | Sensor or Sensor Circuit, ECM |
| 64 | Fuel Injector Circuit | Wiring Harness, ECM (ECM Transistor) |
| 65 | Throttle Valve Switch | Switch or Switch Circuit, ECM |
| 66 | Knock Sensor | Sensor or Sensor Circuit, ECM |
| 71 | Throttle Position Sensor | TPS or Circuit, ECM |
| 72, 73 | EGR VSV Circuit | Wiring Circuit, ECM |