Engine Controls - Tests W/Codes - 4.0L: Summary

If no hard failure DTCs are present, driveability symptoms exist or intermittent DTCs exist, proceed to TEST NTC-1A  - NO TROUBLE CODES TEST MENU, or the appropriate TESTS W/O CODES article for diagnosis by symptom. See following list.

• 4.0L, see: TESTS W/O CODES - 4.0L 6-CYL .
• 5.2L, see: TESTS W/O CODES - 5.2L V8 .