Power Circuit Inspection

■ Check voltage 

1. IG "OFF". Disconnect HO2S (B2/S1) connector.
2. IG "ON".
3. Measure voltage between power terminal of HO2S (B2/S1) heater harness connector and chassis ground.

   Specification:  B+

4. Is the measured voltage within specification?

   YES 

   • Go to "Control Circuit Inspection" procedure below.

   NO 

   • Repair open or short to ground in HO2S (B2/S1) Heater power circuit. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.