H92 - Check HO2S Switching

- Key "OFF".

- Inspect Electronic Engine Controls (EEC) wire harness for proper routing and insulation; burnt, chafed, intermittently shorted or open. Service as necessary.

- Disconnect Powertrain Control Module (PCM) 60 pin connector and inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- Install breakout box and connect PCM to breakout box.

- Connect analog voltmeter to the suspect Heated Oxygen Sensor (HO2S) test pin and HO2S GND at the breakout box.

- Test drive vehicle at 55 mph with minimum road load for five miles.

- Observe voltmeter for HO2S switching from 0.3 to 0.9 volts within three seconds.

- Did HO2S voltage switch?

Yes -- Unable to duplicate or identify fault at this time. Clear continuous memory Diagnostic Trouble Codes (DTC). Clearing Diagnostic Trouble Codes

For further diagnosis, refer to Diagnosis by Symptom (Diagnostic Routines).

No -- Replace HO2S. Remove breakout box. Reconnect PCM. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)