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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 57 (Engine Control System Diagnosis (2 Of 2) (HEV)) >> DTC U1001: High Speed CAN Communication Bus (H-CAN) >> W/Harness Inspection >> H-CAN register and communication line inspection

H-CAN register and communication line inspection

WARNING: This page is about a different variant/trim than selected.

■ H-CAN register and communication line inspection 1 

  1. IG KEY OFF.
  2. Connect PCM, MCU, HCU, BMS connector.
  3. Measure resistance between terminal H-CAN High and H-CAN Low of PCM connector.

    Specification:  About 60 Ω

    Fig 1: Measuring Resistance Between Terminal H-CAN High And H-CAN Low Of PCM Connector
    G10607020Courtesy of HYUNDAI MOTOR AMERICA
  4. Is the measured resistance within specification?

    YES 

    • Check Each Module 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 HCU and BMS) and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • If the measured value is lower than 10Ω, repair or replace H-CAN High and H-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 H-CAN High/H-CAN Low circuit. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • Go to next procedure.

    ■ H-CAN register and communication line inspection 2 

    1. IG KEY OFF
    2. Disconnect HCU, BMS connector.
    3. Measure resistance between terminal H-CAN Low and H-CAN High of HCU.
    4. Measure resistance between terminal H-CAN Low and H-CAN High of PCM.

      Specification:  About 120 Ω

      Fig 2: Measuring Resistance Between Terminal H-CAN Low And H-CAN High Of HCU And PCM
      G10607021Courtesy of HYUNDAI MOTOR AMERICA
    5. Is the measured value within specification?

      YES 

      • Go to next procedure.

      NO 

      • If the measured value is out of specification, repair or replace 120Ω H-CAN register (Inside of HCU and BMS) and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
      • If the measured value is lower than 10Ω, repair or replace H-CAN High and H-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 H-CAN High/H-CAN Low circuit. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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