Engine Controls - Tests W/Codes - 2.5L & 4.0L: Introduction: Notes

NOTE: For Grand Cherokee with 5.2L engine, see G - 5.2L TESTS W/ CODES article in the ENGINE PERFORMANCE.

If no faults were found while performing F - 2.5L & 4.0L BASIC TESTING, proceed with self-diagnostics. If no fault codes or only pass codes are present after entering self-diagnostics, proceed to TESTS W/O CODES article in the ENGINE PERFORMANCE Section for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.).