Signal Circuit Inspection

Check for short to heater control in harness
1. Ignition "OFF"
2. Disconnect HO2S sensor connector and PCM connector.
3. Ignition "ON" & Engine "OFF"
4. Measure resistance between terminal 2, 3 of sensor harness connector.
  Specification: infinite
  
  Fig 1: Measuring Resistance Between Terminal 2, 3 Of Sensor Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
5. Is measure resistance within Specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Short circuit between HO2S signal circuit and heater control circuit.
  - Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.