Engine Controls - Tests W/Codes - 3.3L CNG: Introduction

If no faults were found while performing steps in the CHRYSLER CORP. - BASIC DIAGNOSTIC PROCEDURES - 3.3L CNG article, proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) or only pass codes are present after entering self-diagnostics, proceed to TEST NTC-1A and TEST NS-1A in this article and CHRYSLER CORP. TROUBLE SHOOTING - NO CODES - 3.3L CNG in the ENGINE PERFORMANCE section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).