Power Circuit Inspection
- Ignition "OFF".
- Refer to HEATED OXYGEN SENSOR (HO2S) and disconnect Downstream O2 Sensor connector.
- Ignition "ON".
- Measure voltage between Pin No. 3 (Power) terminal of Downstream O2 Sensor harness connector and chassis ground.
Specification: B+
- Is the measured value within specification?
YES
- Go to "Control Circuit Inspection" procedure below.
NO
- Repair open or short in power circuit between Downstream O2 Sensor and Battery and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.