Ground Circuit Inspection

Check Open in ground circuit
1. IG KEY "OFF".
2. Disconnect HO2S (S2) connector.
3. Measure resistance between ground terminal of HO2S (S2) and chassis ground.
  Specification: below 1Ω
  
  Fig 1: Measuring Resistance Between Ground Terminal Of HO2S (S2) And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 2: Identifying Oxygen Sensor (Down), PCM And ECM Connector Terminals
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured resistance within specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair Open circuit and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.