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ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1438

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DTC Code DTC Name
C1438 Lost Communication with HV ECU
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DESCRIPTION

The skid control ECU assembly receives signals from the power management control ECU via the CAN communication system.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1438 Lost Communication with HV ECU

154

157

  • INF Code: 154


    • When IG2 terminal is 9.5 V or more, the signal that indicates the brake data cannot be received from the power management control ECU is received for 2 seconds or more.

  • INF Code: 157


    • When IG2 terminal voltage is 9.5 V or more, the signal that indicates the brake date cannot be received from the power management control ECU once or more within 5 seconds occurs 10 times in succession.

  • CAN communication system

  • Skid control ECU assembly

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PROCEDURE


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    CONFIRM DTC


    1. Clear the DTCs.

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      1. Chassis > ABS/VSC/TRC > Clear DTCs


    2. Turn the power switch off.

    3. Turn the power switch on (IG).

    4. Check that no CAN communication system DTC is output.


      1. Chassis > ABS/VSC/TRC > Trouble Codes


      Tip:

      If CAN communication system DTCs and relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for the ABS, VSC and/or electronically controlled brake system) after the CAN communication system returns to normal.

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      Result
      Result Proceed to
      DTC (C1438) is not output A
      DTC (C1438) is output B
      DTC (CAN communication system DTC) is output C