W/Harness Inspection

Terminal and 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

1. IG "OFF" and disconnect HO2S (B1/S2) connector.
2. IG "ON" and ENG "OFF"
3. Measure voltage between terminal 3 of HO2S (B1/S2) harness connector and chassis ground.

Specification : Approx. 0.45V - when pumping current is OFF





4. Is the measured voltage within specification ?






Ground Circuit inspection

1. IG "ON" and disconnect HO2S (B1/S2) connector.
2. Measure voltage between terminal 3 of HO2S (B1/S2) harness connector and chassis ground.
3. Measure voltage between terminals 3 and 4 of HO2S (B1/S2) harness connector.

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





4. Is the measured voltage within specification ?