ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:U0073, U0114

DTC Code DTC Name
U0073 Control Module Communication Bus OFF
U0114 Lost Communication with 4WD Control ECU

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the 4 wheel drive control ECU via the CAN communication system.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0073 Control Module Communication Bus OFF The condition that the bus OFF state occurs once or more within 0.1 seconds occurs 10 times in succession while the voltage at the IG1 terminal is between 10 and 17.4 V. (Sent signals cannot be received.) CAN communication system
U0114 Lost Communication with 4WD Control ECU The CAN signal from the 4 wheel drive control ECU is lost or malfunctioning for 1 second.

  • CAN communication system

  • Skid control ECU (Brake actuator assembly)

  • 4 wheel drive control ECU

PROCEDURE


  1. CHECK IF EACH ECU CONNECTOR IS SECURELY CONNECTED


    1. Turn the ignition switch off.

    2. Check if 4 wheel drive control ECU or skid control ECU (brake actuator assembly) is securely connected.

      OK
      Each connector is securely connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTOR TO EACH ECU CORRECTLY

    OK

  2. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Record the output DTCs (for ABS and CAN communication).

      for ABS: Click here

      for CAN communication system for LHD: Click here

      for CAN communication system for RHD: Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      Tech Tips

      If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for ABS) after the CAN communication system returns to normal.

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

    A

    CHECK CAN COMMUNICATION SYSTEM for LHD: Click here
    CHECK CAN COMMUNICATION SYSTEM for RHD: Click here

    B

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC Click here

    C

    USE SIMULATION METHOD TO CHECK Click here