Engine Controls - Tests W/Codes - 1.8L 4-CYL: Summary

If no hard DTCs (or only pass DTCs) are present, driveability symptoms exist, or intermittent DTCs exist, proceed to TESTS W/O CODES - 1.8L 4-CYL article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.