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Home >> Hyundai >> 2007 >> Accent GLS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) >> DTC Troubleshooting Procedures >> DTC U0001 Can Communication Bus >> Signal Circuit Inspection

Signal Circuit Inspection

  1. Check CAN BUS Short to Ground.
    1. Key "OFF".
    2. Disconnect ECM/PCM connector.
    3. Measure the resistance between terminal 12/C01-2 of ECM/PCM harness connector and chassis ground. [A/T]

      Measure the resistance between terminal 84/C01 of ECM/PCM harness connector and chassis ground. [M/T]

    4. Measure the resistance between terminal 27/C01-2 of ECM/PCM harness connector and chassis ground. [A/T]

      Measure the resistance between terminal 62/C01 of ECM/PCM harness connector and chassis ground. [M/T]

      Specification: Infinite

      Fig 1: Measuring Resistance Between Terminal 12 & 27/C01-2 Of PCM Connector & Chassis Ground (A/T)
      G04801871Courtesy of HYUNDAI MOTOR CO.
      Fig 2: Measuring Resistance Between Terminal 84 & 62/C01 Of ECM Connector & Chassis Ground (M/T)
      G04801872Courtesy of HYUNDAI MOTOR CO.
    5. Is the measured resistance within specification?

      YES  : --> Go to "CAN BUS Terminus Resistance Check (Harness side)" procedure.

      NO  : --> Repair Short in signal circuit and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

  2. CAN BUS Terminus Resistance Check (Harness side)
    1. Key "OFF".
    2. Disconnect ECM/PCM connector.
    3. Measure the resistance between terminal 12 and 27 of ECM/PCM harness connector. (C01-2) [A/T]

      Measure the resistance between terminal 84 and 62 of ECM/PCM harness connector. (C01) [M/T]

      Specification: 120 ± 10Ω

      Fig 3: Measuring Resistance Between Terminal 12 & 27/C01-2 Of PCM Connector & Chassis Ground (A/T)
      G04801871Courtesy of HYUNDAI MOTOR CO.
      Fig 4: Measuring Resistance Between Terminal 84 & 62/C01 Of ECM Connector & Chassis Ground (M/T)
      G04801872Courtesy of HYUNDAI MOTOR CO.
    4. Is the measured resistance within specification?

      YES  : --> Go to "COMPONENT INSPECTION " procedure.

      NO  : --> In case the measured resistance is around 1.0Ω: Repair Short in signal circuit and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

      --> In case the measured resistance is Infinite: Repair Open in signal circuit and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

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