W/Harness Inspection

Engine Control
P2251 O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) - 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?






Vertual Ground Output Circuit Inspection

Check Open or Short in signal circuit
1. IG KEY "OFF".
2. Disconnect HO2S(S1) connector.
3. IG KEY "ON" & ENG "OFF".
4. Measure the voltage between Vertual Ground Output terminal of HO2S(S1) harness connector and chassis ground.

Specification :Approx 2.5V




5. Is the measured voltage within specification ?