Control Circuit Inspection

IG "OFF" & disconnect HO2S (B1/S1) connector.
IG "ON" & ENG "OFF".
Measure voltage between terminal 2 of HO2S (B1/S1) harness connector and chassis ground.
Specification: Approx. 0 V
Is the measured voltage within specification?
YES
- Go to HO2S (B1/S1) "COMPONENT INSPECTION " procedure.
NO
- Repair short to battery in HO2S (B1/S1) Heater control circuit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.