Power Circuit Inspection
- Ignition "OFF".
- Refer to HEATED OXYGEN SENSOR (HO2S) and disconnect Upstream O2 Sensor connector.
- Ignition "ON".
- Measure voltage between Pin No. 4 (Power) terminal of Upstream O2 Sensor harness connector and chassis ground.
Specification : B+
- Is the measured value within specification?
YES
- Go to "Control Circuit Inspection " procedure.
NO
- Repair open or short in power circuit between Upstream O2 Sensor and Battery and then go to "Verification of Vehicle Repair " procedure.