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Home >> Hyundai >> 2004 >> Elantra GLS, Standard >> Repair and Diagnosis >> Engine Mechanical >> Fuel System >> DTC Trouble Shooting Procedures >> DTC P0131: O2 Sensor Circuit Low Input (Bank 1, Sensor 1) >> Inspection Procedures >> 1. Check For Short To Ground In Harness

1. Check For Short To Ground In Harness

  1. Turn ignition switch to OFF position and disconnect HO2S and ECM connectors.
  2. Measure resistance between terminal 1 of the HO2S harness connector and chassis ground.
  3. Measure resistance between terminal 2 of the HO2S harness connector and chassis ground.
  4. Measure resistance between terminal 3 of the HO2S harness connector and chassis ground.
  5. Measure resistance between terminal 4 of the HO2S harness connector and chassis ground.
    Fig 1: Checking HO2S Harness For Short To Ground
    G00749221Courtesy of HYUNDAI MOTOR CO.
    • Specifications : infinite 

Does each resistance indicate open? 

Yes: Go to next step.

No: Repair short to chassis ground in harness.

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