Visual/Physical Inspection

Visually/physically inspect the following items:
- Check for corrosion on terminals.
- Check for terminal tension (at the HO2S and at the ECM).
- Check for damaged wiring.
- Check the HO2S ground circuit for a good connection
- Check front and rear HO2S for connections being reversed.
Was a problem found in any of the above areas?
YES
- Repair as necessary and Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Go to next step as below.