ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1439/66, C1445/66

DTC Code DTC Name
C1439/66 Steering Angle Sensor Initialization Incomplete
C1445/66 Vehicle Driven with Steering Angle Sensor not Initialized

DESCRIPTION

The skid control ECU assembly acquires the steering angle sensor zero point every time the power 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.

DTCs C1439/66 and C1445/66 will be cleared when the power switch is turned off.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1439/66 Steering Angle Sensor Initialization Incomplete 352 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

  • Skid control ECU assembly

 VSC DTC
C1445/66 Vehicle Driven with Steering Angle Sensor not Initialized 353 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 36 km/h (22 mph) or more for 30 seconds or more.

  • Steering angle sensor

  • Yaw rate and acceleration sensor

  • Skid control ECU assembly

 ABS DTC

CAUTION / NOTICE / HINT

Note

Before proceeding with the inspection, explain to the customer that the output DTC is related to temporary loss of the steering angle zero point calibration, such as when the power source voltage drops when the auxiliary battery is removed. Confirm whether this condition occurred.

Tech Tips


  • When DTC U0073/94, U0123/62, U0124/95 and/or U0126/63 is output together with DTC C1439/66 and/or C1445/66, inspect and repair the trouble areas indicated by DTC U0073/94, U0123/62, U0124/95 and/or U0126/63 first.

    Click here

  • When a speed sensor or the yaw rate and acceleration sensor is malfunctioning, DTCs for the steering angle sensor may be output even when the steering angle sensor is normal. When DTCs for a speed sensor or the yaw rate and acceleration sensor are output together with other DTCs for the steering angle sensor, inspect and repair the speed sensor and 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 power switch off.

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

      Click here

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

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1439/66 and/or C1445/66 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 C1439/66 and C1445/66 are not output. D

      Tech Tips


      • When CAN communication system DTCs are output, repair the CAN communication system before repairing each corresponding sensor.

      • If there is a malfunction in a speed sensor or the yaw rate and acceleration sensor, an abnormal value may be output although the steering angle sensor is normal.

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

      • If DTC C1439/66 and/or C1445/66 is not output again, the DTC may have been stored due to a temporary loss of the steering angle zero point calibration, such as when the power source voltage drops.


    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 centered correctly while driving straight ahead.

      Tech Tips

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

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

    NG

    ADJUST FRONT WHEEL ALIGNMENT OR STEERING POSITION Click here

    OK

  3. 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 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 C1439/66 and C1445/66 are not output. A
      Yaw rate and acceleration sensor and/or steering angle sensor DTCs are output. B

      Tech Tips

      If DTC C1439/66 and/or C1445/66 is not output again, the DTC may have been stored due to a temporary loss of the steering angle zero point calibration, such as when the power source voltage drops.


    A

    END

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here