Signal Circuit Inspection
- Ignition "OFF"
- Refer to " HEATED OXYGEN SENSOR (HO2S) " and disconnect Downstream O2 Sensor connector.
- Ignition "ON"
- Measure voltage between Pin No. 1 (Signal) terminal of Downstream O2 Sensor harness connector and chassis ground.
Specification: Approx. 0.5 V
- Is measured value within specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Repair open or short in signal circuit between Downstream O2 Sensor and ECM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.