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

DTC Code INF Code DTC Detection Condition Trouble Area
U0073/94

400

401

Either of the following is detected:


  1. With IG1 terminal voltage 10 V or more, communication with yaw rate sensor does not occurred for 5 seconds or more. (Yaw rate sensor response malfunction)

  2. With IG1 terminal voltage 10 V or more, communication with acceleration sensor does not occurred for 5 seconds or more. (Acceleration sensor response malfunction)

  • CAN communication system (CAN No. 1 bus)

  • Yaw rate and acceleration sensor

  • Skid control ECU
↑ 402 With IG1 terminal voltage 10 V or more, communication with steering angle sensor does not occur within specified time. (Steering angle sensor response malfunction)

  • CAN communication system (CAN No. 1 bus)

  • Steering angle sensor

  • Skid control ECU
↑

406

411

 CAN communication line (power management bus) has open or short, and cannot perform communication.

  • CAN communication system (Power management bus)

  • Skid control ECU
↑

407

412

 CAN communication line (CAN No. 1 bus) has open or short, and cannot perform communication.

  • CAN communication system (CAN No. 1 bus)

  • Skid control ECU
U0123/62 338 With the IG1 terminal voltage 10 V or more, data from the yaw rate sensor cannot be received for 1 second or more.

  • CAN communication system

  • Yaw rate and acceleration sensor

  • Skid control ECU
↑ 339

With the IG1 terminal voltage 10 V or more, the following occurs 10 times in succession:


  • Data from the yaw rate sensor cannot be received once or more within 5 seconds.

 ↑
U0124/95 319 With the IG1 terminal voltage 10 V or more, data from the acceleration sensor cannot be received for 1 second or more.

  • CAN communication system

  • Yaw rate and acceleration sensor

  • Skid control ECU
↑ 320

With the IG1 terminal voltage 10 V or more, the following occurs 10 times in succession:


  • Data from the acceleration sensor cannot be received once or more within 5 seconds.

 ↑
U0126/63 350 With the IG1 terminal voltage 10 V or more, data from the steering angle sensor cannot be received for 1 second or more.

  • CAN communication system

  • Steering angle sensor

  • Skid control ECU
↑ 601

With the IG1 terminal voltage 10 V or more, the following occurs 10 times in succession:


  • Data from the steering angle sensor cannot be received once or more within 5 seconds.

 ↑
U0293/59 152 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.

  • CAN communication system

  • Power management control ECU

  • Skid control ECU
↑ 153 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. ↑

WIRING DIAGRAM

A01NG9FE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the intelligent tester, 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
      HV Communication Open Hybrid vehicle communication 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

      		 -
      Yaw Rate Open Yaw rate sensor 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 removing any sensor or connector.


    B

    RECONFIRM DTC Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    A

  2. CHECK IF EACH SENSOR AND ECU CONNECTOR ARE SECURELY CONNECTED


    1. Turn the power switch off.

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

      OK
      Each sensor and ECU connector are 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) Click here for ABS, VSC and/or electronically controlled brake system, or Click here for CAN communication system).

      Tech Tips

      If the CAN communication system DTC and the 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
      DTC is not output A
      DTC (ABS, VSC and/or electronically controlled brake system DTC) is output B
      DTC (CAN communication system DTC) is output C

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS 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 interruption between the skid control ECU and each sensor or ECU Click here.

    4. Check that there are no momentary interruptions.


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

    5. Check that no CAN communication system DTC is output Click here.

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

      Result
      Result Proceed to
      DTC is not output A
      DTC (ABS, VSC and/or electronically controlled brake system DTC) is output B
      DTC (CAN communication system DTC) is output C

      Tech Tips

      The CAN communication system must be normal when repairing each sensor DTC (for ABS, VSC and/or electronically controlled brake system).


    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

    END