ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:U0073, U0110, U0120, U0124, U0126, U0128, U0293

DTC Code DTC Name
U0073 Control Module Communication Bus Off
U0110 Lost Communication with Drive Motor Control Module "A"
U0120 Lost Communication With Starter / Generator Control Module
U0124 Lost Communication With Lateral Acceleration Sensor Module
U0126 Lost Communication With Steering Angle Sensor Module
U0128 Lost Communication With EPB Module
U0293 Lost Communication with Hybrid Vehicle Control System

DESCRIPTION

The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

The skid control ECU (brake booster with master cylinder assembly) receives signals from the hybrid vehicle control ECU, steering angle sensor, certification ECU (smart key ECU assembly), inverter with converter assembly and yaw rate and acceleration sensor (airbag sensor assembly) via CAN communication.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
U0073 Control Module Communication Bus Off

461

462

463

  • INF Code: 461


    • Either of the following is detected:


      1. Yaw rate and acceleration sensor communication is disabled for 1 second or more.

      2. Yaw rate and acceleration sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.


  • INF Code: 462


    • Either of the following is detected:


      1. Steering angle sensor communication is disabled for 1 second or more.

      2. Steering angle sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.


  • INF Code: 463


    • Bus off occurs once or more per 0.1 seconds 10 times repeatedly.

  • INF Code: 461


    • CAN communication line

    • Yaw rate and acceleration sensor (airbag sensor assembly)

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


  • INF Code: 462


    • CAN communication line

    • Steering angle sensor

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


  • INF Code: 463


    • CAN communication line

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

 Electronically controlled brake system DTC
U0110 Lost Communication with Drive Motor Control Module "A"

1153

1154

  • INF Code: 1153


    • When terminal IG2 voltage is 9.5 V or more, data from the inverter with converter assembly cannot be received for 2 seconds or more.

  • INF Code: 1154


    • When terminal IG2 voltage is 9.5 V or more, the condition in which data from the inverter with converter assembly cannot be received once or more within 5 seconds occurs 10 times in succession.

  • CAN communication line

  • Inverter with converter assembly

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

 Electronically controlled brake system DTC
U0120 Lost Communication With Starter / Generator Control Module 1158 Push start switch data is invalid for 3 seconds or more.

  • CAN communication line

  • Certification ECU (smart key ECU assembly)

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

 Electronically controlled brake system DTC
U0124 Lost Communication With Lateral Acceleration Sensor Module

591

592

  • INF Code: 591


    • Acceleration sensor communication is disabled for 1 second or more.


  • INF Code: 592


    • Acceleration sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.

  • CAN communication line

  • Acceleration sensor (airbag sensor assembly)

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

 ABS DTC
U0126 Lost Communication With Steering Angle Sensor Module

741

742

  • INF Code: 741


    • Steering angle sensor communication is disabled for 1 second or more.


  • INF Code: 742


    • Steering angle sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.

  • CAN communication line

  • Steering angle sensor

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

 VSC DTC
U0128 Lost Communication With EPB Module 425 With terminal IG1 voltage at 10 V or more, data cannot be received from the electric parking brake ECU for 1 second or more.

  • CAN communication line

  • Electric parking brake ECU

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

 Brake hold DTC
U0293 Lost Communication with Hybrid Vehicle Control System

411

412

413

  • INF Code: 411, 413


    • When terminal IG2 voltage is 9.5 V or more, data from the hybrid vehicle control ECU cannot be received for 2 seconds or more.

  • INF Code: 412


    • When terminal IG2 voltage is 9.5 V or more, the condition in which data from the hybrid vehicle control ECU cannot be received once or more within 5 seconds occurs 10 times in succession.

  • CAN communication line

  • Hybrid vehicle control ECU

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

 Electronically controlled brake system DTC
DTC Detection Conditions: U0073 INF Code: 461
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status Yaw rate and acceleration sensor communication is disabled. ○ -
Communication with the yaw rate and acceleration sensor is invalid once or more within 5 seconds. - ○
Detection Time 1 second or more Occurs 10 times or more within 60 seconds
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: U0073 INF Code: 462
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status Steering angle sensor communication is disabled. ○ -
Communication with the steering angle sensor is invalid once or more within 5 seconds. - ○
Detection Time 1 second or more Occurs 10 times or more within 60 seconds
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

PROCEDURE


  1. CHECK DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (IG).

    4. Check if the same DTC is output.


      Chassis > ABS/VSC/TRC > Trouble Codes

      Tech Tips

      If CAN communication system DTCs and relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for the ABS, VSC and/or electronically controlled brake system) after the CAN communication system returns to normal.

      Click here

      Result
      Result Proceed to
      CAN communication system DTCs are output. A
      DTCs are not output. B

    A

    INSPECT CAN COMMUNICATION SYSTEM Click here

    B

    USE SIMULATION METHOD TO CHECK Click here