Engine Controls - Basic Testing - 4-CYL: Summary

If no faults were found while performing the basic diagnostic procedures in this BASIC TESTING article, proceed to the appropriate G - TESTS W/ CODES article in the ENGINE PERFORMANCE section. If no hard codes are found in self-diagnostics, proceed to TESTS W/O CODES article in the ENGINE PERFORMANCE section for diagnosis by symptom (i.e., ROUGH IDLE, NO-START, etc.), or intermittent diagnostic procedures.