Section 53 (Engine Controls - Basic Testing - 4.0L): Summary
WARNING: This page is about a different car, the 1997 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed to TESTS W/CODES - 4.0L article. If no hard codes are found in self-diagnostics, proceed to appropriate TESTS W/O CODES - 4.0L article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.