Section 20 (Engine Controls - Tests W/Codes - 3.3L CNG): Summary
WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
If no hard DTCs (or only pass codes) are present, driveability symptoms exist or intermittent codes exist, proceed to TEST NTC-1A in for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or INTERMITTENTS in CHRYSLER CORP. TROUBLE SHOOTING - NO CODES - 3.3L CNG article.