Engine Controls - Basic Testing - 4.0L: Summary

If no faults were found while performing procedures in BASIC DIAGNOSTIC TESTING article, proceed to appropriate G -TESTS W/CODES article in the ENGINE PERFORMANCE section below. If no hard codes are found in self-diagnostics, proceed to appropriate article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures:

• TESTS W/CODES - EEC-IV (4.0L) (for Aerostar & Explorer)
• TESTS W/CODES - EEC-V (4.0L) (for Ranger)
• TESTS W/O CODES - EEC-IV (for Aerostar)
• TESTS W/O CODES - EEC-IV (for Explorer)
• TESTS W/O CODES - EEC-V (for Ranger)