ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:U0073/51, U0100/53, U0124/55, U0129/52, U1103/57

DTC Code DTC Name
U0073/51 Control Module Communication Bus OFF
U0100/53 Lost Communication with ECM/PCM
U0124/55 Lost Communication with Lateral Acceleration Sensor Module
U0129/52 Lost Communication with Brake System Control Module
U1103/57 Lost Communication with Stop and Start Control Module

DESCRIPTION

The electric parking brake ECU uses CAN communication with the ECM, skid control ECU, main body ECU and yaw rate sensor.

DTC Code DTC Detection Condition Trouble Area
U0073/51 CAN communication malfunctions. CAN communication system
U0100/53

One of the following conditions is met:


  • The vehicle speed is 15 km/h (9 mph) or more, and data cannot be sent to the ECM.

  • When a signal is received with a wrong application checksum, the data may be erroneous. As a consequence, the signal is rejected by the electric parking brake ECU.

  • When a signal is received with a shorter length than the one specified, data may be missing or the signal mapping may be erroneous. As a consequence, the signal is rejected by the electric parking brake ECU.

  • CAN communication system

  • ECM

  • Electric parking brake ECU (Parking brake with bracket actuator assembly)
U0124/55

Either condition is met:


  • Data from the yaw rate sensor cannot be received.

  • When a signal is received with a wrong application checksum, the data may be erroneous. As a consequence, the signal is rejected by the electric parking brake ECU.

  • CAN communication system

  • Yaw rate sensor

  • Electric parking brake ECU (Parking brake with bracket actuator assembly)
U0129/52

One of the following conditions is met:


  • Data from the skid control ECU cannot be received.

  • When a signal is received with a wrong application checksum, the data may be erroneous. As a consequence, the signal is rejected by the electric parking brake ECU.

  • When a signal is received with a shorter length than the one specified, data may be missing or the signal mapping may be erroneous. As a consequence, the signal is rejected by the electric parking brake ECU.

  • CAN communication system

  • Skid control ECU (Brake actuator assembly)

  • Electric parking brake ECU (Parking brake with bracket actuator assembly)
U1103/57 CAN communication from the engine stop and start ECU stops for 3 seconds or more.

  • CAN communication system

  • Engine stop and start ECU

  • Electric parking brake ECU (Parking brake with bracket actuator assembly)

PROCEDURE


  1. CHECK DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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