VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1447

DTC Code DTC Name
C1447 External System Malfunction

DESCRIPTION

The skid control ECU (brake actuator assembly) acquires the steering angle 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
C1447 External System Malfunction Due to the VGRS system calibration request, the steering angle sensor zero point value has been cleared.

  • Speed sensor

  • Steering angle sensor

  • Yaw rate and acceleration sensor

  • Front Steering control ECU

PROCEDURE


  1. CHECK 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 and acceleration sensor DTCs are output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1447 is output. A
      CAN communication system DTCs are output. B
      Speed sensor, yaw rate and acceleration sensor and/or steering sensor DTCs are output. C
      DTCs are not output. D

      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 and acceleration sensor is malfunctioning, DTCs for the steering angle sensor may be stored even though the steering angle sensor is normal.

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

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


    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 ANGLE 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 and acceleration 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 Click here

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the engine switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 35 km/h (22 mph) or more and turn the steering wheel to the right and left.

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1447 is output. A
      DTC C1447 is not output. B

      Tech Tips

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


    A

    REPLACE FRONT STEERING CONTROL ECU for LHD: Click here
    REPLACE FRONT STEERING CONTROL ECU for RHD: Click here

    B

    END