ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ Vacuum Brake Booster), Diagnostic DTC:C1447

DTC Code DTC Name
C1447 External System Malfunction

DESCRIPTION

The skid control ECU (brake actuator assembly) acquires the steering sensor zero point every time the engine switch is turned on (IG) and the vehicle is driven at 35 km/h (22 mph) or more for approximately 5 seconds. The ECU also stores previous zero points.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1447 External System Malfunction Due to the VGRS system calibration request, the steering sensor zero point value has been cleared.

  • Speed sensor

  • Steering sensor

  • Yaw rate sensor

  • VGRS ECU (front steering control ECU)

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PROCEDURE


  1. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG) again and check that no CAN communication system DTCs are output.

      Click here

    4. Start the engine.

    5. Drive the vehicle at a speed of 35 km/h (22 mph) or more and turn the steering wheel to the right and left and check that no speed sensor or yaw rate sensor DTCs are output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      Tech Tips


      • When CAN communication DTCs are output, inspect and repair the trouble areas indicated by CAN communication first.

      • If a speed sensor or the yaw rate sensor is malfunctioning, DTCs for the steering sensor may be stored even though the steering sensor is normal.

      • If speed sensor and yaw rate sensor DTCs are output simultaneously, repair these malfunctions and then inspect the steering sensor.

      • If DTC C1447 is not output again, the DTC may have been stored due to a temporary loss of steering sensor zero point calibration, such as a loss of calibration due to the power source voltage being low.

      Result
      Result Proceed to
      DTC C1447 is output. A
      CAN communication system DTCs are output. B
      Speed sensor, yaw rate sensor and/or steering sensor (spiral with sensor cable sub-assembly) DTCs are output. C
      DTCs are not output. D

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    C

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    D

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. CHECK STEERING SENSOR ZERO POINT CALIBRATION


    1. Drive the vehicle straight ahead at 35 km/h (22 mph) or more for at least 5 seconds.

    2. Check that the steering wheel is correctly centered while driving straight ahead.

      Tech Tips

      If front wheel alignment and steering are adjusted as a result of an off-center steering wheel, acquire the yaw rate sensor zero point again after the adjustments are completed.

      OK
      The steering wheel is correctly centered.
      Result
      Proceed to
      OK
      NG

    NG

    ADJUST FRONT WHEEL ALIGNMENT OR STEERING for AWD: Click here
    ADJUST FRONT WHEEL ALIGNMENT OR STEERING for 2WD: Click here

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Start the engine.

    3. Drive the vehicle at a speed of 35 km/h (22 mph) or more and turn the steering wheel to the right and left and check that no speed sensor or yaw rate sensor DTCs are output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      Tech Tips

      If DTC C1447 is not output again, the DTC may have been stored due to a temporary loss of the steering sensor zero point calibration, such as a loss of calibration due to the power source voltage being low.

      Result
      Result Proceed to
      DTC C1447 is output. A
      DTCs C1447 is not output. B

    A

    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here

    B

    END