Ignition "ON" & Engine "OFF".

Monitor the O2 SNSR VOL.-B1/S2 parameter on the Scantool 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/ECM)

- 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?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to next step as below.