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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 65 (Automatic Transaxle System Diagnosis (HEV)) >> DTC U1004: Lost Communication With Hybrid Powertrain Control Module (H-CAN) >> W/Harness Inspection >> Signal Circuit Inspection

Signal Circuit Inspection

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

■ All Circuit Inspection 

  1. Ignition "OFF".
  2. Measure resistance between CAN high terminal and CAN low terminal of PCM/TCM harness connector.

    Specification:  Approx. 60 Ω ± 10Ω (PCM connector connected)

    Fig 1: Measuring Resistance Between CAN High And Low Terminal Of PCM/TCM Harness Connector
    G10603873Courtesy of HYUNDAI MOTOR AMERICA
  3. Is the measured resistance within specifications?

    YES 

    • Go to "Resistance Inspection" procedure below.

    NO 

    • Substitute with a known-good PCM/TCM and check for proper operation. If the problem is corrected, replace PCM/TCM and Go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Resistance Inspection 

  1. Ignition "OFF".
  2. Disconnect "PCM/TCM" connector.
  3. Measure resistance between CAN high terminal and CAN low terminal of PCM/TCM harness connector.

    Specification:  Approx. 120 Ω ± 10Ω (Disconnect PCM connector)

    Fig 2: Measuring Resistance Between CAN High And Low Terminal Of PCM/TCM Harness Connector
    G10603874Courtesy of HYUNDAI MOTOR AMERICA
  4. Is the measured resistance within specifications?

    YES 

    • Substitute with a known-good PCM/TCM and check for proper operation. If the problem is corrected, replace PCM/TCM and Go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    • Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage and resistor for CAN communication is open. Repair as necessary and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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