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Home >> Hyundai >> 2017 >> Sonata Plug-In Hybrid >> Repair and Diagnosis >> External Pages >> Different car >> Section 328 (4WD Control System Diagnosis) >> DTC U0122: Lost Communication With Vehicle Dynamics Control Module >> Wiring Inspection >> CAN Register And Communication Line Inspection

CAN Register And Communication Line Inspection

WARNING: This page is about a different car, the 2017 Hyundai Santa Fe Sport. However, it is still accessible from the selected car via links, so may be relevant.

■ CAN register and communication line inspection 1 

  1. IG KEY OFF.
  2. Connect PCM, 4WD ECU, TCM, ABS connector.
  3. Measure resistance between terminal 3 and 11 of diagnostic connector.

    Specification:  About 60 Ω

  4. Is the measured resistance within specification?

    YES 

    • Check 4WD ECU connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair " procedure.
    • Go to next procedure.

    NO 

    • If the measured value is out of specification, repair or replace 120Ω CAN register (Inside of PCM and Cluster) and then, go to "Verification of Vehicle Repair " procedure.
    • If the measured value is lower than 10Ω, repair or replace CAN High and CAN Low are short each other. And then, go to "Verification of Vehicle Repair " procedure.
    • If the measured value is ∞ Ω, repair or replace the open in CAN High/CAN Low circuit. And then, go to "Verification of Vehicle Repair " procedure.
    • Go to next procedure.

■ CAN register and communication line inspection 2 

  1. IG KEY OFF
  2. Disconnect PCM connector and Cluster connector.
  3. Measure resistance between terminal CAN Low and CAN High of PCM.

    Specification:  About 120 Ω

  4. Is the measured value within specification?

    YES 

    • Go to next procedure.

    NO 

    • If the measured value is out of specification, repair or replace 120Ω CAN register (Inside of PCM and Cluster) and then, go to "Verification of Vehicle Repair " procedure.
    • If the measured value is lower than 10Ω, repair or replace CAN High and CAN Low are short each other. And then, go to "Verification of Vehicle Repair " procedure.
    • If the measured value is ∞ Ω, repair or replace the open in CAN High/CAN Low circuit. And then, go to "Verification of Vehicle Repair " procedure.
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