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.
  
  NO
  
  Repair contact resistance or open in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.