Control Circuit Inspection

Check open in harness
1. IG "OFF" & Disconnect HO2S (S1) connector.
2. IG "ON".
3. Measure voltage between control terminal of HO2S (S1) heater harness connector and chassis ground.
  Specification: Approx. 3.5V
  
  Fig 1: Measuring Voltage Between Control Terminal Of HO2S (S1) Heater Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured voltage within specification?
  YES
  
  Go to "COMPONENT INSPECTION " procedure.
  
  NO
  
  Repair or replace as necessary and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.