Section 42 (Engine Controls - Self-Diagnostics): Summary
WARNING: This page is about a different car, the 2003 Isuzu Axiom. However, it is still accessible from the selected car via links, so may be relevant.
If no hard fault codes are present, driveability symptoms are present or intermittent codes are present, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.