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Home >> Kia >> 2019 >> Sorento EX, 4WD >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> 4WD Control Diagnosis >> DTC U0122: Lost Communication With Vehicle Dynamics Control Module >> Wiring Inspection >> CAN Communication Line Inspection >> CAN Signal Inspection

CAN Signal Inspection

  1. Ignition switch "OFF"
  2. Connect VMI to KDS and launch the oscilloscope (2 Channel):

    Channel A (+): Pin No. 13 (P-CAN High) terminal (IGPM connector)

    Channel A (-): Ground

    Channel B (+): Pin No. 14 (P-CAN Low) terminal (IGPM connector)

    Channel B (-): Ground

  3. Ignition switch "ON"

    Specification:  C-CAN High voltage - Approx. 2.8V/C-CAN Low voltage - Approx. 2.2V (Average)

    G12841259Courtesy of KIA MOTORS AMERICA, INC.
  4. Is the measured value within specification?

    YES 

    • Fault might be intermittent and caused either by poor contact in connectors or wiring harness, or it has been repaired and control module memory is not cleared yet. Thoroughly check terminal of battery, all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.
    • Repair or replace as necessary and then go to "VERIFICATION OF REPAIR " procedure.

    NO