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HOMESERVICE MANUALSHYUNDAI2005SANTA FE GLS, 2.7 D, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (ENGINE CONTROL SYSTEM DIAGNOSIS (3.5L) (1 OF 2))DTC TROUBLESHOOTING PROCEDURESDTC P0031: HO2S HEATER CIRCUIT LOW (BANK 1/SENSOR 1)POWER CIRCUIT INSPECTION
2005 Hyundai Santa Fe GLS, 2.7 D, AWD

Power Circuit Inspection

2005 Hyundai Santa Fe GLS, 2.7 D, AWDSECTION Power Circuit Inspection
WARNING: This page is about a different variant/trim than selected.
  1. Check Voltage
    1. Ignition "OFF"
    2. Disconnect HO2 sensor connector
    3. Ignition "ON" & Engine "OFF"
    4. Measure voltage between terminal 3 of HO2 sensor harness connector and chassis ground.

      Specification : Approx. B+

      Fig 1: Measuring Voltage Between Terminal 3 Of HO2 Sensor Harness Connector And Chassis Ground
      G03845343Courtesy of HYUNDAI MOTOR CO.
    5. Is the measured voltage within specification?

      YES 

      NO 

      • Go to next step .
  2. Check for open in harness
    1. Ignition "OFF"
    2. Disconnect HO2 sensor and Control Relay.
    3. Measure resistance between terminal "3" of HO2 sensor harness connector and terminal "87" of Control Relay harness connector.

      Specification : Approx. below 1Ω

      Fig 2: Measuring Resistance Between Terminal Of HO2 Sensor Harness Connector And Terminal Of Control Relay Harness Connector
      G03845344Courtesy of HYUNDAI MOTOR CO.
    4. Is the measured resistance within specification?

      YES 

      NO 

      • Check for open in harness.
      • Check that PCM #1 fuse 20A between HO2S and Control Relay is installed or blown off.
      • Repair or replace as necessary. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.