Ground Circuit Inspection

■ Check open in harness 

1. IG "ON" and disconnect HO2S (B1/S2) connector.
2. Measure voltage between signal terminal of HO2S (B1/S2) harness connector and chassis ground.(Measurement "A")
3. Measure voltage between signal and ground terminals of HO2S (B1/S2) harness connector.(Measurement "B")

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

   Fig 1: Measuring Voltage Between Signal Terminal Of HO2S (B1/S2) Harness Connector And Chassis Ground (Measurement A)

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 2: Measuring Voltage Between Signal And Ground Terminals Of HO2S (B1/S2) Harness Connector (Measurement B)

   Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured voltage within specification?

   YES 

   • Go to "Component Inspection" procedure below.

   NO 

   • Repair contact resistance or open in harness and go to "Verification of Vehicle Repair " procedure.