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Home >> Kia >> 2013 >> Optima SX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) - 2.0L >> DTC U0001: High Speed CAN Communication Bus Off >> Inspection Repair >> W/Harness Inspection >> Check CAN Communication Line For Open
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Check CAN Communication Line For Open

  1. Ignition "OFF".
  2. Disconnect PCM harness connector.
  3. Measure resistance between High signal terminal and Low signal terminal of PCM harness connector.

    Specification :  Approx. 110~130Ω

    Fig 1: Measuring Resistance Between High Signal Terminal & Low Signal Terminal Of PCM Harness Connector
    G07383065Courtesy of KIA MOTORS AMERICA, INC.
  4. Is resistance within the specification?

    YES 

    • Go to next step as below.

    NO 

    • Check for open in wiring related to the CAN communication (PCM, 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. 110~130Ω
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