| Fig. 1: The HO2S can be monitored with an appropriate
and Data-stream capable scan tool
|
WARNING
Do not pierce the wires when testing this sensor; this can lead to wiring harness
damage. Backprobe the connector to properly read the voltage of the HO2S.
- Disconnect the HO2S.
- Measure the resistance between PWR and GND terminals of the sensor. Resistance
should be approximately 6 ohms at 68°F (20°C). If resistance is
not within specification, the sensor's heater element is faulty.
- With the HO2S connected and engine running, measure the voltage with a Digital
Volt-Ohmmeter (DVOM) between terminals HO2S and SIG
RTN (GND) of the oxygen sensor connector. Voltage should fluctuate
between 0.01–1.0 volts. If voltage fluctuation is slow or voltage is
not within specification, the sensor may be faulty.
