Engine Controls - Tests W/Codes - Except OBD-II: Summery

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