W/Harness Inspection

Engine Control
P2270 O2 Sensor Signal Stuck Lean (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 voltage
1. IG "OFF" and disconnect HO2S(B1/S2) connector.
2. IG "ON".
3. Measure voltage between signal terminal of HO2S(B1/S2) harness connector and chassis ground.

Specification :Approx. 0.45V




4. Is the measured voltage within specification ?






Ground Circuit Inspection

Check open in harness
1. IG "ON" and disconnect HO2S(B1/S2) connector.
2. Measure voltage between signal terminal of HO2S(B1/S2) harness connector and chassis ground.(Measurement "A")
3. Measure voltage between signal and ground terminals of HO2S(B1/S2) harness connector.(Measurement "B")

Specification :Voltage difference between measurement "A" and "B" is below 200mV.








4. Is the measured voltage within specification ?