W/Harness Inspection

Engine Control
P2271 O2 Sensor Signal Stuck Rich (Bank 1 Sensor 2) - Inspection/Repair:_:W/Harness Inspection

Terminal and Connector Inspection

1. Ignition "ON" & Engine "OFF".
2. Monitor the O2 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.
3. 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.
4. Was a problem found in any of the above areas?