Terminal and Connector Inspection

Ignition "ON" & Engine "OFF"
Monitor the HO2S SNSR VOL.-B1/S2 parameter on the GDS data list while wiggling the wiring harness and related connectors. Refer to Signal Waveform & Data in the "General Information" procedure.
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 sensor2 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 as below.