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HOMESERVICE MANUALSHYUNDAI2005SANTA FE GLS, 2.7 D, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM DIAGNOSIS (2.7L) (2 OF 2)DTC TROUBLESHOOTING PROCEDURESDTC U0101: SERIAL COMMUNICATION PROBLEM WITH TCU (TIMEOUT)CAN HIGH LINE INSPECTION
2005 Hyundai Santa Fe GLS, 2.7 D, AWD

Can High Line Inspection

2005 Hyundai Santa Fe GLS, 2.7 D, AWDSECTION Can High Line Inspection
  1. Check for Open in harness
    1. Ignition "OFF".
    2. Disconnect ECM and TCM connectors.
    3. Measure resistance between terminals 36 of the ECM harness connector and 3 of the TCM harness connector.

      Specification: Approx. 0Ω

      Fig 1: Measuring Resistance Between Terminals 36 Of ECM Harness Connector And 3 Of TCM Harness Connector
      G03846031Courtesy of HYUNDAI MOTOR CO.
    4. Is resistance within the specification?

      YES 

      • Go to next step.

      NO 

  2. Check for short to ground in harness.
    1. Measure resistance between terminal 36 of the ECM harness connector and chassis ground.

      Specification: Infinite

      Fig 2: Measuring Resistance Between Terminal 36 Of ECM Harness Connector And Chassis Ground
      G03846032Courtesy of HYUNDAI MOTOR CO.
    2. Is resistance within the specification?

      YES 

      • Go to next step.

      NO 

  3. Check for short to battery in harness.
    1. Reconnect the ECM connector.
    2. Ignition "ON" & Engine "OFF"
    3. Measure voltage between terminal 36 of the ECM harness connector and chassis ground.

      Specification: Approx. 0V

      Fig 3: Measuring Voltage Between Terminal 36 Of ECM Harness Connector And Chassis Ground
      G03846033Courtesy of HYUNDAI MOTOR CO.
    4. Is voltage within the specification?

      YES 

      NO 

RENDER: 1.0x

NO RELATED

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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.