VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1439, C1445

DTC Code DTC Name
C1439 Steering Angle Sensor Initialization Incomplete
C1445 Vehicle Driven with Steering Angle Sensor not Initialized

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
C1439 Steering Angle Sensor Initialization Incomplete After the steering angle sensor zero point calibration is cleared due to, for example, fluctuations in the power source, the steering angle sensor zero point calibration cannot be obtained for 0.048 seconds of continuous driving.
  • Steering angle sensor

  • Yaw rate and acceleration sensor

C1445 Vehicle Driven with Steering Angle Sensor not Initialized Steering angle sensor zero point calibration cannot be obtained when the vehicle is driven without a record of steering angle sensor zero point calibration at a speed of 10 km/h (6 mph) or more for 30 seconds or more without the brake pedal being depressed.
  • Steering angle sensor

  • Yaw rate and acceleration sensor

CAUTION / NOTICE / HINT

Note

Because this DTC is related to a temporary loss of steering angle sensor zero point calibration, before proceeding with the inspection, it is useful to confirm whether the power source voltage was interrupted by an operation such as removal or disconnection of the battery.

Tech Tips

When a speed sensor or the yaw rate and acceleration sensor is malfunctioning, DTCs for the steering angle sensor may be stored even when the steering angle sensor is normal. When DTCs for a speed sensor or yaw rate and acceleration sensor are output together with DTCs for the steering angle sensor, inspect and repair the speed sensor or yaw rate and acceleration sensor first, and then inspect and repair the steering angle sensor.

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
      DTCs C1439 and/or C1445 are output. A
      CAN communication system DTCs are output. B
      Speed sensor, yaw rate and acceleration sensor and/or steering angle sensor DTCs are output. C
      DTCs C1439 and C1445 are not output. D

      Tech Tips


      • 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 C1439 and/or C1445 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
    C
    D
    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
    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
      DTCs C1439 and C1445 are not output. A
      Yaw rate and acceleration sensor and/or steering angle sensor DTCs are output. B

      Tech Tips

      If DTC C1439 and/or C1445 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
    B