Engine Controls - Basic Diagnostic Procedures - 3.8L: Summary

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, no trouble codes (or only intermittent ones) were found while performing ON-BOARD DIAGNOSTIC SYSTEM CHECK and driveability problems exist, proceed to ENGINE CONTROL SYSTEMS - TESTS W/O CODES - 3.8L ENGINE article for diagnosis by symptom (i.e., ROUGH IDLE, NO-START, etc.) or intermittent diagnostic procedures.