Terminal And Connector Inspection

Ignition "ON" & Engine "OFF".
Monitor the O2 SNSR VOL.-B1/S2 parameter on the GDS data list while wiggling the wiring harness and related connectors. Refer to (Figure).
The value should remain more or less unchanged. If not, check for the following conditions:
- Check for corrosion on terminals.
- Check for terminal tension (at the HO2S and at the PCM)
- Check for damaged wiring.
- Check the HO2S ground circuit for a good connection.
- Check the 15A sensor 2 fuse.
- 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 below.