Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Controls - Tests W/Codes: Summary
If no hard fault codes are present, driveability symptoms exist or intermittent codes exist, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.
| Code | System Affected | Probable Cause | ||||
|---|---|---|---|---|---|---|
| 0 | ECU | No Signal to ECU | ||||
| 1 | O2 Sensor (Left) | Open/Shorted Signal Circuit | ||||
| 2 | O2 Sensor (Right) | Open/Shorted Signal Circuit | ||||
| 3 | MAP Sensor | MAP Sensor Electrical Problem | ||||
| 4 | Crank Angle No. 1 | Sensor Circuit Problem | ||||
| 5 | MAP Sensor | MAP Sensor Mechanical Problem | ||||
| 6 (2) | Coolant Temp Sensor (TW) | Open/Shorted Signal Circuit | ||||
| 7 (2) | Throttle Angle Sensor | Open/Shorted Signal Circuit | ||||
| 9 | No. 1 Cylinder Position | Problem in CYL Sensor Circuit | ||||
| 10 | Intake Air Temperature | Open/Shorted Signal Circuit | ||||
| 12 | EGR System | No EGR Action | ||||
| 13 | Atmospheric Pressure | Open/Shorted Signal Circuit | ||||
| 14 | Electronic Air Control Valve (EACV) | EACV Circuit Problem | ||||
| 15 | Ignition Output Signal | Open/Shorted Signal Circuit | ||||
| 16 | Fuel Injector | Open/Shorted Signal Circuit | ||||
| 17 (2) | Vehicle Speed Sensor (VSS) | No VSS Signal | ||||
| 18 | Ignition Timing Adjuster | Open/Shorted Signal Circuit | ||||
| 23 | Left Knock Sensor | Open/Shorted Signal Circuit | ||||
| 41 | Left O2 Sensor Heater | Open/Shorted Signal Circuit | ||||
| 42 | Right O2 Sensor Heater | Open/Shorted Signal Circuit | ||||
| 43 | Left Fuel Supply System | Open/Shorted O2 Circuit | ||||
| 44 | Right Fuel Supply System | Open/Shorted O2 Circuit | ||||
| 45 | Left Fuel Metering | Injectors Control | ||||
| 46 | Right Fuel Metering | Injectors Control | ||||
| 53 | Right Knock Sensor | Open/Shorted Signal Circuit | ||||
| 54 | Crank Angle No. 2 | Sensor Circuit Problem | ||||
| 59 | No. 2 Cylinder Position | Problem in CYL Sensor Circuit | ||||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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