Section 6 (Engine Controls - Tests W/Codes): Summary
WARNING: This page is about a different car, the 1995 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
If no hard trouble codes are present, driveability symptoms exist or intermittent trouble codes exist, see TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent procedures.