Check open in harness
- IG "ON" and disconnect HO2S (B1/S2) connector.
- Measure voltage between signal terminal of HO2S (B1/S2) harness connector and chassis ground (Measurement "A").
- 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.
- Is the measured voltage within specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Repair contact resistance or open in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.