H47 - Check HO2S Heater Wiring Continuity

- Key "OFF".

- Heated Oxygen Sensor(s) (HO2S) disconnected.

- HO2S heater relay removed from power distribution box.

- Measure resistance between HO2S heater test pin in the power distribution box and HO2S heater test pins at the HO2S vehicle harness connectors.

- Is the resistance less than 5.0 ohms?

Yes -- Go to H48

No -- Service open circuit. Reconnect all components. Do not rerun Quick Test.