ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:U0073

DTC Code DTC Name
U0073 Control Module Communication Bus OFF

DESCRIPTION

The skid control ECU (brake actuator assembly) receives the signal sent from the ECM and Combination meter assembly via the CAN communication system. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

DTC No. DTC Detection Condition Trouble Area
U0073

When either of following conditions detected:


  1. With the IG terminal voltage in the normal range, a condition where data cannot be received occurs 10 times or more consecutively.

  2. With terminal IG1 10 V or more, bus off condition occurs once or more within 0.1 seconds, and this state continues 10 times or more.

  • ECM

  • Combination meter assembly

  • CAN communication system

INSPECTION PROCEDURE

PROCEDURE


  1. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Turn the ignition switch off.

    3. Start the engine.

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

    5. Check for DTCs Click here.

      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 system) is output B
      DTC is not output C

    B

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

    CHECK CAN COMMUNICATION SYSTEM Click here