Signal Circuit Inspection

Check Voltage
1. IG "OFF" and disconnect HO2S (S2) connector.
2. IG "ON".
3. Measure voltage between signal terminal of HO2S (BS2) harness connector and chassis ground.
  Specification: Approx. 0.45V
  
  Fig 1: Measuring Voltage Between Signal Terminal Of HO2S (BS2) Harness Connector And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
  
  Fig 2: Identifying Oxygen Sensor Connector Terminals
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured voltage within specification?
  YES
  
  Go to "GROUND CIRCUIT INSPECTION " procedure.
  
  NO
  
  Repair short to battery in harness, and go to "VERIFICATION OF VEHICLE REPAIR " procedure.