W/Harness Inspection

Power Supply Circuit Inspection

1. Ignition "OFF"
2. Disconnect HO2S connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between Heater Power terminal of the HO2S harness connector and chassis ground.

Specification : B+





5. Is voltage within specification?






Control Circuit Inspection

1. Ignition "OFF"
2. Disconnect HO2S connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between Heater Control terminal of the HO2S harness connector and chassis ground.

Specification : 4 - 5V





5. Is voltage within specification?






Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) 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?