Control Circuit Inspection

Check for open in control harness.
1. Ignition "OFF".
2. Disconnect HO2S and PCM connectors
3. Measure resistance between terminals 6 of the HO2S heater harness connector and 8 of the PCM harness connector
  Specification: Approx 0Ω
  
  Fig 1: Measuring Resistance Between Terminals
  Courtesy of HYUNDAI MOTOR CO.
4. Is resistance within the specification?
  YES
  - Go to next step as below
  NO
  - Repair as necessary and go to VERIFICATION OF VEHICLE REPAIR procedure.
Check for short to battery in control circuit.
1. Reconnect the PCM connector.
2. Ignition "ON" & Engine "OFF"
3. Measure voltage between terminal 3 of the HO2S heater harness connector and chassis ground.
  Specification: Approx 0V
  
  Fig 2: Measuring Voltage Between Terminal And Ground
  Courtesy of HYUNDAI MOTOR CO.
4. Is voltage within the specification?
  YES
  - Go to COMPONENT INSPECTION procedure
  NO
  - Repair as necessary and go to VERIFICATION OF VEHICLE REPAIR procedure.