Power Circuit Inspection

Check Open or Short in power circuit
1. IG "OFF" & Disconnect HO2S (S2) connector.
2. IG "ON".
3. Measure the voltage between power terminal of HO2S (S2) harness connector and chassis ground.
  Specification: Approx B+
  
  Fig 1: Measuring Voltage Between Power Terminal Of HO2S (S2) Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 2: Identifying Oxygen Sensor, ECM And PCM Connector Terminals
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured voltage within specification?
  YES
  - Go to "CONTROL CIRCUIT INSPECTION " procedure.
  NO
  - Repair Open or Short circuit and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.