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 assembly receives signals from the power management control ECU, steering angle sensor and yaw rate and acceleration sensor via CAN communication.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
U0073/94 Control Module Communication Bus OFF

400

401

402

405

407

410

412

  • INF Code: 400


    • Either of the following is detected:


      1. When terminal IG1 voltage is 10 V or more, data from the yaw rate sensor cannot be received for 1 second or more. (Yaw rate sensor response malfunction)

      2. When terminal IG1 voltage is 10 V or more, the condition in which data from the yaw rate sensor cannot be received once or more within 5 seconds, occurs 10 times in succession.


  • INF Code: 401


    • Either of the following is detected:


      1. When terminal IG1 voltage is 10 V or more, data from the acceleration sensor cannot be received for 1 second or more. (Acceleration sensor response malfunction)

      2. When terminal IG1 voltage is 10 V or more, the condition in which data from the acceleration sensor cannot be received once or more within 5 seconds, occurs 10 times in succession.


  • INF Code: 402


    • Either of the following is detected:


      1. When terminal IG1 voltage is 10 V or more, data from the steering angle sensor cannot be received for 1 second or more. (Steering angle sensor response malfunction)

      2. When terminal IG1 voltage is 10 V or more, the condition in which data from the steering angle sensor cannot be received once or more within 5 seconds, occurs 10 times in succession.


  • INF Code: 405, 407, 410, 412


    • CAN communication line has open or short, and cannot perform communication.

  • INF Code: 400, 401


    • CAN communication line

    • Yaw rate and acceleration sensor

    • Skid control ECU assembly


  • INF Code: 402


    • CAN communication line

    • Steering angle sensor

    • Skid control ECU assembly


  • INF Code: 405, 407, 410, 412


    • CAN communication line

    • Skid control ECU assembly

 Electronically controlled brake system DTC
U0123/62 Lost Communication with Yaw Rate Sensor Module

338

339

  • INF Code: 338


    • When terminal IG1 voltage is 10 V or more, data from the yaw rate sensor cannot be received for 1 second or more.


  • INF Code: 339


    • When terminal IG1 voltage is 10 V or more, the condition in which data from the yaw rate sensor cannot be received once or more within 5 seconds occurs 10 times in succession.

  • CAN communication line

  • Yaw rate sensor (Yaw rate and acceleration sensor)

  • Skid control ECU assembly

 VSC DTC
U0124/95 Lost Communication with Lateral Acceleration Sensor Module

319

320

  • INF Code: 319


    • When terminal IG1 voltage is 10 V or more, data from the acceleration sensor cannot be received for 1 second or more.


  • INF Code: 320


    • When terminal IG1 voltage is 10 V or more, the condition in which data from the acceleration sensor cannot be received once or more within 5 seconds occurs 10 times in succession.

  • CAN communication line

  • Acceleration sensor (Yaw rate and acceleration sensor)

  • Skid control ECU assembly

 ABS DTC
U0126/63 Lost Communication with Steering Angle Sensor Module

350

601

  • INF Code: 350


    • When terminal IG1 voltage is 10 V or more, data from the steering angle sensor cannot be received for 1 second or more.


  • INF Code: 601


    • When terminal IG1 voltage is 10 V or more, the condition in which data from the steering angle sensor cannot be received once or more within 5 seconds occurs 10 times in succession.

  • CAN communication line

  • Steering angle sensor

  • Skid control ECU assembly

 VSC DTC
U0293/59 Communication Error from HV ECU

152

153

Either of the following is detected:


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

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

  • CAN communication line

  • Power management control ECU

  • Skid control ECU assembly

 Electronically controlled brake system DTC

WIRING DIAGRAM


  1. for LHD

    A00232AE01

  2. for RHD

    A01MTC3E02

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


      Chassis > ABS/VSC/TRC > Data List
      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

      		 -
      Deceleration Open Acceleration 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

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Yaw Rate Open
      Deceleration Open
      Steering Open
      HV Communication Open
      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

    GO TO STEP 3 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.
      Result
      Proceed to
      OK
      NG

    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 the ABS, VSC, electronically controlled brake system and/or CAN communication system).

      for the ABS, VSC and Electronically Controlled Brake System: Click here

      for the CAN Communication System: Click here


      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.

      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 assembly and each sensor or ECU.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    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


      Chassis > ABS/VSC/TRC > Trouble Codes
      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 the 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