Section 1 (Engine Controls - Tests W/Codes): Summary
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1990 Jaguar XJ6, 1990 Jaguar XJ-S, 1989 Jaguar XJ6, 1989 Jaguar XJ-S, and 1988 Jaguar XJ6. However, it is still accessible from the selected car via links, so may be relevant.
If no hard fault codes are present, see TESTS W/O CODES article in this section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.