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Home >> Hyundai >> 2009 >> Elantra GLS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> DTC Troubleshooting Procedures >> DTC U0001 Can Communication Malfunction >> Signal Circuit Inspection >> Check Can Communication Line For Open

Check Can Communication Line For Open

  1. Ignition "OFF"
  2. Disconnect ECM harness connector
  3. Measure resistance between terminals 77 and 78 of the ECM harness connector.
    Fig 1: Measuring Resistance Between Terminals 77 And 78 Of ECM Harness Connector
    G05363920Courtesy of HYUNDAI MOTOR CO.
  4. Is resistance within the specification?

    YES 

    • Go to next step as below

    NO 

    • Check for open in wiring related to the CAN communication (ECM, EPS, MTS and vertical resistor at the junction box). Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure
    NOTE: Vertical Resistor Resistance: Approx. 110-1300.
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