ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1438/59

DTC Code DTC Name
C1438/59 Lost Communication with HV ECU

DESCRIPTION

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

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1438/59 Lost Communication with HV ECU 154 When terminal IG1 voltage is 9.5 V or more, the signal that indicates the brake data cannot be received from the power management control ECU for 2 seconds or more.

  • CAN communication line

  • Skid control ECU assembly

 Electronically controlled brake system DTC

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the GTS, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      HV Communication Open Hybrid vehicle communication open detection Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      HV Communication Open
      OK
      There are no momentary interruptions.

      Tech Tips

      Perform the above inspection before disconnecting any sensors or connectors.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch on (READY).

    4. Drive the vehicle at a speed of 15 km/h (9 mph) or more and turn the steering wheel to the right and left.

    5. Check that no CAN communication system DTCs are output.

      Click here

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1438/59 is not output. A
      DTC C1438/59 is output. B
      CAN communication system DTCs are output. C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

  3. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Turn the power switch off.

    2. Repair or replace the harness or connector.

    3. Check for any momentary interruptions between the skid control ECU assembly and the power management control ECU.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch on (READY).

    4. Drive the vehicle at a speed of 15 km/h (9 mph) or more and turn the steering wheel to the right and left.

    5. Check that no CAN communication system DTCs are output.

      Click here

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1438/59 is not output. A
      DTC C1438/59 is output. B
      CAN communication system DTCs are output. C

    A

    END

    B

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here