СИСТЕМА ECD, Diagnostic DTC:U0129

DTC Code DTC Name
U0129 Lost Communication with Brake System Control Module

DESCRIPTION

The ECM receives signals sent from the skid control ECU via the CAN communication system. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding ECU or sensor.

DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 5 seconds

The following conditions are met for 2.22 seconds (1 trip detection logic):


  • The battery voltage is 10.5 V or higher.

  • There is no communication between the ECM and skid control ECU.

  • CAN communication system

  • Brake actuator assembly (Skid control ECU)

  • ECM

INSPECTION PROCEDURE

PROCEDURE


  1. CLEAR DTC AND PERFORM ROAD TEST


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Clear the DTCs Click here.

      Tech Tips

      Write down the currently output DTCs before clearing them.

    4. Start the engine and drive the vehicle at a low speed.


    NEXT

  2. CHECK DTC OUTPUT (DTC U0129)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / DTC.

    4. Read the DTCs.

      Result
      Result Proceed to
      DTC U0129 is not output A
      DTC U0129 is output B

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here