Virtual Ground Output Circuit Inspection

Check Open or Short in signal circuit
1. IG KEY "OFF".
2. Disconnect HO2S (S1) connector.
3. IG KEY "ON" & ENG "OFF"
4. Measure the voltage between Virtual Ground Output terminal of HO2S (S1) harness connector and chassis ground.
  Specification: Approx 2.5V
  
  Fig 1: Measuring Voltage Between Virtual Ground Output Terminal Of HO2S (S1) Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 2: Oxygen Sensor (UP), PCM And ECM Connector Terminals
  Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured voltage within specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair Open or Short circuit and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.