CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM(for 1ZR-FAE), 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 CAN communication. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before performing troubleshooting for each corresponding ECU or sensor.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
U0129 Lost Communication with Brake System Control Module

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. The ignition switch is ON.

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

  3. 2.22 seconds

  4. 1-trip detection logic

  • CAN communication system

  • Brake actuator assembly (Skid control ECU)

  • ECM

 Comes on DTC stored

CAUTION / NOTICE / HINT

Tech Tips

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Turn the ignition switch to ON and wait for 3 seconds or more.

  2. Check for DTCs again.

    Click here

PROCEDURE


  1. CLEAR DTC AND PERFORM ROAD TEST


    1. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

      Tech Tips

      Write down any currently output DTCs before clearing them.

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

      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK DTC OUTPUT (DTC U0129)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.


      Powertrain > Engine and ECT > Trouble Codes

    5. Read the DTCs using the GTS.

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

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    GO TO CAN COMMUNICATION SYSTEM w/o Central Gateway ECU: Click here
    GO TO CAN COMMUNICATION SYSTEM w/ Central Gateway ECU: Click here