Control Circuit Inspection
- Check Short in control circuit
- IG "OFF" & Disconnect HO2S (S2)_DOWN connector.
- IG "ON".
- Measure the voltage between heater control terminal "4" of HO2S (S2)_DOWN harness connector and chassis ground.
Specification : Approx. 3.5V
- Is the measured voltage within specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Repair Short to ground in control circuit and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.