Control Circuit Inspection

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