Engine Controls - Basic Testing - 3.3L CNG: Summary

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, go to TESTS W/CODES - 3.3L CNG article in the ENGINE PERFORMANCE section. If no hard codes are found in self-diagnostics, go to TESTS W/O CODES - CNG article in the ENGINE PERFORMANCE section for diagnosis by symptom (i.e., ROUGH IDLE, NO-START, etc.) or intermittent diagnostic procedures.