W/Harness Inspection

Engine Control
P0138 O2 Sensor Circuit High Voltage (Bank 1 / Sensor 2) - Inspection/Repair:_:W/Harness Inspection

Terminal & Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Signal Circuit Inspection

Check Short to power in signal circuit
1. IG KEY "OFF".
2. Disconnect HO2S(S2) connector.
3. IG KEY "ON" & ENG "OFF".
4. Measure the voltage between signal terminal of HO2S(S2) harness connector and chassis ground.

Specification :Approx 0.45V




5. Is the measured voltage within specification ?