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Home >> Hyundai >> 2004 >> Accent GL, 2D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 2) >> DTC Troubleshooting Procedures >> DTC P0137: O2 Sensor Circuit Low Input (Bank1/SESN0R2) >> Signal Circuit Inspection
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Signal Circuit Inspection

  1. Check for short to chassis ground in harness
    1. Ignition "OFF"
    2. Disconnect HO2S sensor connector and PCM connector.
    3. Ignition "ON" & Engine "OFF"
    4. Measure resistance between terminal 2 of sensor harness connector and chassis ground.

      Specification: infinite

      Fig 1: Measuring Resistance Between Terminal 2 Of Sensor Harness Connector And Chassis Ground
      G03851814Courtesy of HYUNDAI MOTOR CO.
    5. Is measure resistance within Specification?

      YES 

      • Go to "Check for short to ground in harness" below.

      NO 

      • Short circuit between HO2S signal circuit and chassis ground.
      • Short to chassis ground between PCM harness connector and HO2S harness connector.
      • Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  2. Check for short to ground in harness
    1. Ignition "OFF"
    2. Disconnect HO2S sensor connector and PCM connector.
    3. Ignition "ON" & Engine "OFF"
    4. Measure resistance between terminal 1, 2 of sensor harness connector.

      Specification: infinite

      Fig 2: Measuring Resistance Between Terminals 1 & 2 Of Sensor Harness Connector
      G03851815Courtesy of HYUNDAI MOTOR CO.
    5. Is measure resistance within Specification?

      YES 

      NO 

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