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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 64 (HEV Motor System Diagnosis (HEV)) >> DTC U1004: Lost Communication With Hybrid Powertrain Control Module (H-CAN) >> W/Harness Inspection >> H-CAN Communication Circuit Inspection

H-CAN Communication Circuit Inspection

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

■ H-CAN Communication Line Inspection 

  1. IG KEY OFF.
  2. Disconnect HCU connector and MCU connector.
  3. Measure the resistance between H-CAN-HIGH Terminal of HCU harness connector and H-CAN-HIGH Terminal of MCU harness connector.
  4. Measure the resistance between H-CAN-LOW Terminal of HCU harness connector and H-CAN-LOW Terminal of MCU harness connector.

    Specification:  Below 1

    Fig 1: Measuring Resistance Between HCU Harness Connector And MCU Harness Connector
    G10602622Courtesy of HYUNDAI MOTOR AMERICA
  5. 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.
    • Substitute with a known-good HCU and check for proper operation. If the problem is corrected, replace HCU and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

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