Dtc C1439 Steering Angle Sensor Initialization Incomplete

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK 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 acquires the steering angle sensor zero point every time the ignition switch is turned ON 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 and C1445 will be cleared when the ignition switch is turned off.

DTC Code
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 sensor zero point calibration cannot be obtained for 60 seconds of continuous driving.
  1. Steering angle sensor
  2. Yaw rate and acceleration sensor
  3. Brake actuator assembly (Skid control ECU)
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.
  1. Steering angle sensor
  2. Yaw rate and acceleration sensor
  3. Brake actuator assembly (Skid control ECU)

WIRING DIAGRAM

Refer to DTCs U0073, U0100, U0123, U0124 and U0126 (YARIS_NCP93 RM000000YUO0DIX.html).

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR06QX.html).
  2. 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 battery is removed, and confirm that this condition occurred.
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 RM000000YUO0DIX.html).
  2. When the speed sensor or the yaw rate and acceleration sensor has a malfunction, DTCs for the steering angle sensor may be output even when the steering angle sensor is normal. When DTCs for the speed sensor or 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.
1.CHECK DTC

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0BQX.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON again and check that no CAN communication system DTCs are output (YARIS_NCP93 RM000001D3E00OX.html).

  1. Drive the vehicle and turn the steering wheel to the right and left at a speed of 35 km/h (22 mph) and check that no speed sensor and yaw rate and acceleration sensor DTCs are output (YARIS_NCP93 RM000000XHV0BQX.html).

    Result
    Result
    		Proceed to
    DTCs (C1439 and/or C1445) are output
    		A
    CAN communication system DTC is output
    		B
    Speed sensor and/or yaw rate and acceleration sensor DTC is output
    		C
    DTCs (C1439 and C1445) are not output
    		D

    HINT:
    1. If there is a malfunction in the speed sensor or the yaw rate and acceleration sensor, an abnormal value may be output although the steering angle sensor is normal.
    2. If the speed sensor and the yaw rate and acceleration sensor DTCs are output simultaneously, repair the sensors and inspect the steering angle sensor.
    3. If the same 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 (YARIS_NCP93 RM000001D3500JX.html)

C
REPAIR CIRCUIT INDICATED BY OUTPUT DTC (YARIS_NCP93 RM000000XHU08DX.html)

D
USE SIMULATION METHOD TO CHECK
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.

  1. Check if 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 off-centered position of the steering wheel, acquire 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. Turn the ignition switch off.

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0BQX.html).

  1. Start the engine.

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

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0BQX.html).

    Result
    Result
    		Proceed to
    DTCs (C1439 and/or C1445) are output
    		A
    DTCs (C1439 and C1445) are not output
    		B

    HINT:
    If the same DTC C1439 and/or C1445 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
END
A

REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)