Ground Circuit Inspection

■ Check Open in Harness 

1. IG "ON". Disconnect HO2S (B1/S1) connector.
2. Measure voltage between signal terminal of HO2S (B1/S1) harness connector and chassis ground (Measurement "A").
3. Measure voltage between signal and ground terminals of HO2S (B1/S1) harness connector (Measurement "B").

   Specification:  Voltage difference between measurement "A" and "B" is below 200mV.

4. Is the measured voltage within specification?

   YES 

   • Go to "COMPONENT INSPECTION " procedure.

   NO 

   • Repair contact resistance or open in harness. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.