h13: Check HEGO Sensor on Engines with VAM
| Steps | _Key Off
_Disconnect HEGO sensor from vehicle harness _Remove air cleaner to gain access to air meter inlet. Using a standard wood lead pencil, prop the air meter door partway open. _Connect DVOM to HEGO Signal at the sensor and battery negative post _DVOM on 20 volt scale _Start the engine and run at approximately 2000 rpm for 2 minutes |
| Result | Does the DVOM indicate greater than 0.5 volts within 1 minute? |
| Direction | YES
GO to Continue NO Remove pencil from Air Meter. Reinstall air cleaner. Replace HEGO sensor. Rerun Quick Test |
| Notes | Vacuum/air leaks in non-EEC-IV areas could also cause Code 41. Check for:
Leaking vacuum actuator (e.g. A/C control motor) Engine sealing EGR system PCV system Lead contaminated HEGO sensor Unmetered air leak between Air Meter and throttle body |
| Component | Heated Exhaust Gas Oxygen Sensor |
| Description | The HEGO sensor supplies the EEC with a signal that indicates a rich or lean condition during engine operation. |
| Location | Threaded into the turbo outlet elbow |
| Wire Colors | Dark Green with Purple stripe
Grey with Yellow stripe Black with Light Green stripe |
| Image |   "> |