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).

- 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 are as?

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