4. Check For Short To Power In Harness

1. Turn ignition switch to OFF position.
2. Disconnect ECM and HO2S connectors.
3. Turn ignition switch to ON position.
4. Measure voltage between terminal 4 of the HO2S harness connector and chassis ground.
   Fig 1: Checking HO2S Harness For Short To Voltage

   Courtesy of HYUNDAI MOTOR CO.

• Specification : below 0.5V 

Is voltage within specification? 

Yes: Go to next step.

No: Repair short to power in harness.