Section 7 (Engine Controls - Tests W/Codes): Summary
WARNING: This page is about a different car, the 1991 Mitsubishi 3000GT. However, it is still accessible from the selected car via links, so may be relevant.
If no hard fault codes (or only pass codes) are present, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.