4. Check For Short To Ground In Harness

1. Turn ignition switch to OFF position and disconnect ECM connector.
2. Measure resistance between terminal 4 of the HO2S harness connector and chassis ground.
   Fig 1: Checking HO2S Harness For Open Circuit

   Courtesy of HYUNDAI MOTOR CO.

• Specification : infinite 

Does resistance indicate open? 

Yes: Proceed with ECM problem procedure.

No: Repair short to chassis ground in harness.