Engine Controls - Tests W/Codes: Summary

If no hard fault codes (or only pass codes) are present, driveability symptoms exist or intermittent codes exist, proceed to H - W/O CODES article for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.

The abbreviations for wire colors used in the individual CIRCUIT TEST diagrams are as follows:

• Bk - Black
• Bl - Blue
• Gn - Green
• R - Red
• W - White
• Y - Yellow