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 the TESTS W/O CODES article for diagnosis by symptom (ie, ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.

If no hard fault codes are present, driveability symptoms exist or intermittent codes exist, proceed to INTRODUCTION  .

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. If no fault codes are present after entering self-diagnostics, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.