Dtc C1439 Steering Angle Sensor Initialization Incomplete

Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131

DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC

PERFORM STEERING ANGLE SENSOR ZERO POINT CALIBRATION

RECONFIRM DTC

DTC C1439 Steering Angle Sensor Initialization Incomplete

DTC C1445 Vehicle Driven with Steering Angle Sensor not Initialized


DESCRIPTION

The skid control ECU (brake actuator assembly) acquires steering angle sensor zero point every time the ignition switch is turned to ON and the vehicle is driven at 35 km/h (22 mph) or more for approximately 5 seconds. The ECU also stores the previous zero point.
The steering angle sensor zero point malfunction warning is canceled by turning the ignition switch off.

DTC No.
DTC Detection Condition
Trouble Area
C1439
After the steering angle sensor zero point calibration is cleared due to, for example, fluctuations in the power source, the steering angle zero point calibration cannot be obtained for 60 seconds of continuous driving.
  1. Steering angle sensor (Spiral cable sub-assembly)
  2. Yaw rate and deceleration sensor (yaw rate sensor)
  3. skid control ECU (brake actuator assembly)
C1445
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 35 km/h (22 mph) or more for 30 seconds or more without the brake pedal being depressed.

INSPECTION PROCEDURE

NOTICE:
  1. Before proceeding with the inspection, explain to the customer that the output DTC is related to temporary loss of the steering angle zero calibration, such as when the power voltage drops when the battery is removed, and confirm that this condition occurred.
  2. When replacing the master cylinder solenoid, perform calibration (YARIS_NCP93 RM000000XHR07EX.html).
HINT:
  1. When DTC U0073, U0123, U0124 and/or U0126 is output together with DTC C1439 and/or C1445, inspect and repair the trouble areas indicated by DTC U0073, U0123, U0124 and/or U0126 first (YARIS_NCP93 RM000000YUO0FEX.html).
  2. When the speed sensor or the yaw rate and deceleration sensor (yaw rate sensor) has trouble, DTCs for the steering angle sensor (spiral cable sub-assembly) may be output even when the steering angle sensor is normal. When DTCs for the speed sensor or the yaw rate and deceleration sensor (yaw rate sensor) are output together with DTCs for the steering angle sensor (spiral cable sub-assembly), inspect and repair the speed sensor and yaw rate and deceleration sensor (yaw rate sensor) first, and then inspect and repair the steering angle sensor (spiral cable sub-assembly).
1.CHECK DTC

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0D3X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON again and check that no CAN communication system DTC is output.

  1. Drive the vehicle at a speed of 40 km/h (25 mph) and turn the steering wheel to the right and left, and then check that no speed sensor and yaw rate and acceleration sensor DTCs are output (YARIS_NCP93 RM000000XHV0D3X.html).

    Result
    Result
    		Proceed to
    DTC is output
    		C1439 and/or C1445
    		A
    Relating to CAN communication system
    		B
    Relating to speed sensor or yaw rate and deceleration sensor (yaw rate sensor)
    		C
    DTC is not output
    		D

    HINT:
    1. If there is a malfunction in the speed sensor or the yaw rate and deceleration sensor (yaw rate sensor), an abnormal value may be output although the steering angle sensor (spiral cable sub-assembly) is normal.
    2. If the speed sensor and the yaw rate and deceleration sensor (yaw rate sensor) DTCs are output simultaneously, repair the sensors and inspect the steering angle sensor (spiral cable sub-assembly).
    3. If DTC C1439 or C1445 is not output again, the DTC may have been stored due to a temporary loss of the steering angle zero calibration, such as when the power voltage drops.


B
CHECK CAN COMMUNICATION SYSTEM (YARIS_NCP93 RM000001RSO05UX.html)

C
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (YARIS_NCP93 RM000000XHU092X.html)

D
USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM000000UZ309WX.html)
A


2.PERFORM 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.

  1. Check that the centered position of the steering wheel is correctly set while driving straight ahead.

    HINT:
    If the front wheel alignment and steering position are adjusted as a result of an abnormal centered position of the steering wheel, acquire the yaw rate and acceleration sensor zero point again after the adjustments are completed.
    OK:
    The centered position of the steering wheel is correctly set.


NG
ADJUST FRONT WHEEL ALIGNMENT OR STEERING POSITION
OK


3.RECONFIRM DTC

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0D3X.html).

  1. Turn the ignition switch off.

  1. Start the engine.

  1. Drive the vehicle at a speed of 40 km/h (25 mph) or more and turn the steering wheel to the right and left.

  1. Check if the same DTC is output (YARIS_NCP93 RM000000XHV0D3X.html).

    Result
    Result
    		Proceed to
    DTCs C1439 and C1445 are not output
    		A
    Yaw rate and acceleration sensor and/or steering angle sensor DTC is output
    		B

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


B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (YARIS_NCP93 RM000000XHU092X.html)
A

END