H22 - Check Continuity of Power Ground Circuit

- Key "OFF".

- Heated Oxygen Sensor (HO2S) disconnected.

- Measure resistance between PWR GND circuit at the HO2S vehicle harness connector and battery negative post.

- Is resistance less than 5.0 ohms?

Yes -- For Diagnostic Trouble Codes (DTC) 136, 172 and 176 go to H23. H23 - Attempt to Eliminate DTC 136, 172 or 176

No -- Service open in PWR GND circuit. Reconnect HO2S sensor. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)