Control Circuit Inspection
- Check short to ground
- IG "OFF". Disconnect HO2S (B1/S2) connector.
- Measure resistance between control terminal of HO2S (B1/S2) heater harness connector and chassis ground.
Specification: Infinite
- Is the measured resistance within specification?
YES
- Go to "CONTROL CIRCUIT INSPECTION " procedure.
NO
- Repair short to ground in HO2S (B1/S2) heater control circuit. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- Check Open In Harness
- IG "OFF". Disconnect HO2S (B1/S2) and PCM connector.
- Measure resistance between control terminal of HO2S (B1/S2) heater harness connector and heater control terminal of PCM harness connector.
Specification: Approx. below 1Ω
- Is the measured resistance within specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Repair open in HO2S (B1/S2) heater control circuit. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.