Engine Controls - Basic Diagnostic Procedures: Summary

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed to 1989 SELF-DIAGNOSTICS -- ALLANTE or 1990 SELF-DIAGNOSTICS -- ALLANTE article. If no hard codes are found in self-diagnostics, (if vehicle has self-diagnostic system) proceed to 1989 TROUBLE SHOOTING - NO CODES -- ALLANTE or 1990 TROUBLE SHOOTING - NO CODES -- ALLANTE article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.