Control Circuit Inspection

Check for open in control harness.
1. Ignition "OFF".
2. Disconnect the PCM connector
3. Measure resistance between terminals 4 of the HO2S heater harness connector and 9 of the PCM harness connector.
  Specification : Approx 0Ω
  
  Fig 1: Measuring Resistance Between Terminals 4 Of HO2S Heater Harness Connector And 9 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 4 of the HO2S heater harness connector and chassis ground.
  Specification : infinite
  
  Fig 2: Measuring Resistance Between Terminal 4 Of HO2S Heater Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
2. Is resistance within the specification?
  YES
  - Go to COMPONENT INSPECTION procedure
  NO
  - Repair as necessary and go to VERIFICATION OF VEHICLE REPAIR procedure.