Engine Controls Self-Diagnostics: Summary

If no hard fault DTCs are present, driveability symptoms exist or intermittent DTC(s) exist, proceed to TROUBLE SHOOTING - NO CODES - 5.7L CORVETTE article for diagnosis by symptom (i.e., ROUGH IDLE, NO-START, etc.) or intermittent diagnostic procedures, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.