Diagnostic Strategy: Diagnostics

• Carry out on-board diagnostic procedures key on/engine off (KOEO) and key on/engine running (KOER).
• Record all diagnostic trouble codes (DTCs).
• Repair all non-transmission codes first.
• Repair all transmission codes second.
• Erase all continuous codes and attempt to repeat them.
• Repair all continuous codes which reappear.
• If only pass codes are obtained, proceed to DIAGNOSIS BY SYMPTOM  in this article for further information and diagnosis.

Follow the diagnostic sequence to diagnose and repair the concern the first time.