Engine Controls - Basic Testing 4.0 & 5.0L: Summary

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed to SELF-DIAGNOSTICS in appropriate article:

• For 4.0L vehicles, see TESTS W/CODES - 4.0L.
• For 5.0L vehicles, see TESTS W/CODES - 5.0L.

If no trouble codes are found in self-diagnostics, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.