ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:U0073/51, U0124/55, U0129/52, U0293/54

DTC Code DTC Name
U0073/51 Control Module Communication Bus OFF
U0124/55 Lost Communication with Lateral Acceleration Sensor Module
U0129/52 Lost Communication with Brake System Control Module
U0293/54 Lost Communication with HV ECU

DESCRIPTION

The parking brake ECU assembly communicates with the hybrid vehicle control ECU, skid control ECU (brake booster with master cylinder assembly) and deceleration sensor (airbag ECU assembly) via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
U0073/51 Control Module Communication Bus OFF With the power switch on (IG), the bus is off (communication with other ECUs is not possible) CAN communication system Yes An electric parking brake system malfunction is displayed on the multi-information display.
U0124/55 Lost Communication with Lateral Acceleration Sensor Module With the power switch on (IG) and the vehicle being driven at 7 km/h (4.3 mph) or more, the parking brake ECU assembly cannot receive signals from the deceleration sensor (airbag ECU assembly).

  • CAN communication system

  • Deceleration sensor (Airbag ECU assembly)

 Yes An electric parking brake system malfunction is displayed on the multi-information display.
U0129/52 Lost Communication with Brake System Control Module With the power switch on (IG), the parking brake ECU assembly cannot receive signals from the skid control ECU (brake booster with master cylinder assembly) for approximately 1 second or 10 seconds (malfunction duration differs depending on the signal).

  • CAN communication system

  • Skid control ECU (Brake booster with master cylinder assembly)

 Yes An electric parking brake system malfunction is displayed on the multi-information display.
U0293/54 Lost Communication with HV ECU With the power switch on (IG), the parking brake ECU assembly cannot receive signals from the hybrid vehicle control ECU for approximately 1 second or 10 seconds (malfunction duration differs depending on the signal).

  • CAN communication system

  • Hybrid vehicle control ECU

 Yes An electric parking brake system malfunction is displayed on the multi-information display.

PROCEDURE


  1. GO TO CAN COMMUNICATION SYSTEM


    1. Go to CAN communication system.



      Result
      Proceed to
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    END