ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:U0073/94, U0123/62, U0124/95, U0126/63, U0293/59

DTC Code DTC Name
U0073/94 Control Module Communication Bus OFF
U0123/62 Lost Communication with Yaw Rate Sensor Module
U0124/95 Lost Communication with Lateral Acceleration Sensor Module
U0126/63 Lost Communication with Steering Angle Sensor Module
U0293/59 Communication Error from HV ECU

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) receives signals from the power management control ECU, steering angle sensor and yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.

DTC No. INF Code DTC Detection Condition Trouble Area
U0073/94 461

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.

  • CAN communication line (V bus)

  • Yaw rate and acceleration sensor (Airbag sensor assembly)

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

  • CAN communication line (V bus)

  • Steering angle sensor

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

463

464

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

  • CAN communication line

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

465

466

 Sending does not complete within 5 seconds after data is output from the skid control ECU (brake booster with master cylinder assembly). ↑
U0123/62 731 Yaw rate sensor communication is disabled for 1 second or more.

  • CAN communication line (V bus)

  • Yaw rate and acceleration sensor (Airbag sensor assembly)

  • Skid control ECU (Brake booster with master cylinder assembly)
↑ 732 Yaw rate sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds. ↑
U0124/95 591 Acceleration sensor communication is disabled for 1 second or more.

  • CAN communication line (V bus)

  • Yaw rate and acceleration sensor (Airbag sensor assembly)

  • Skid control ECU (Brake booster with master cylinder assembly)
↑ 592 Acceleration sensor communication is disabled once per 5 seconds 10 times or more within 60 seconds. ↑
U0126/63 741 Steering angle sensor communication is disabled for 1 second or more.

  • CAN communication line (V bus)

  • Steering angle sensor

  • Skid control ECU (Brake booster with master cylinder assembly)
↑ 742 Steering angle sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds. ↑
U0293/59

411

412

413

Either of the following is detected:


  1. With the IG2 terminal voltage 9.5 V or more, data from the power management control ECU cannot be received for 2 seconds or more.

  2. With the IG2 terminal voltage 9.5 V or more, data from the power management control ECU cannot be received once or more within 5 seconds occur 10 times in succession.

  • CAN communication line (Sub bus 15)

  • Power management control ECU

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

WIRING DIAGRAM

A0007LGE11

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the GTS, check for any momentary interruptions in the wire harness and connector corresponding to a DTC Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Yaw Rate Open Yaw rate sensor open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      Steering Open Steering angle sensor open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      HV Communication Open Hybrid vehicle communication open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      Result
      Result Proceed to
      There is a constant open circuit. A
      There are no momentary interruptions. B
      There are momentary interruptions. C

      Tech Tips

      Perform the above inspection before disconnecting any sensors or connectors.


    B

    RECONFIRM DTC Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    A

  2. CHECK IF EACH CONNECTOR IS SECURELY CONNECTED (POWER MANAGEMENT CONTROL ECU, SENSOR)


    1. Turn the power switch off.

    2. Check if each sensor and ECU connector is securely connected.

      OK
      Each sensor and ECU connector is securely connected.

    NG

    CONNECT CONNECTOR TO EACH SENSOR OR ECU CORRECTLY

    OK

  3. RECONFIRM DTC


    1. Turn the power switch off.

    2. Record the output DTCs (for ABS, VSC, electronically controlled brake system, and/or CAN communication system) (See page for ABS, VSC and/or electronically controlled brake system, or Click here for CAN communication system).

      Tech Tips

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

      Result
      Result Proceed to
      DTCs are not output. A
      ABS, VSC and/or electronically controlled brake system DTCs are output. B
      CAN communication system DTCs are output. C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

  4. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Turn the power switch off.

    2. Repair or replace the harness or connector.

    3. Check for any momentary interruptions between the skid control ECU (brake booster with master cylinder assembly) and each sensor or ECU Click here.


    NEXT

  5. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs Click here.

    3. Turn the power switch on (READY).

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

    5. Check that no CAN communication system DTCs are output Click here.

    6. If ABS, VSC and/or electronically controlled brake system DTCs are output, record them Click here.

      Result
      Result Proceed to
      DTCs are not output. A
      ABS, VSC and/or electronically controlled brake system DTCs are output. B
      CAN communication system DTCs are output. C

      Tech Tips

      The CAN communication system must be normal when performing troubleshooting for sensor DTCs (for ABS, VSC and/or electronically controlled brake system).


    A

    END

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here