Dtc C1439 Steering Angle Sensor Initialization Incomplete

Brake. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Brake Control Dynamic Control Systems. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

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 the 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 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 zero point cannot be obtained for 60 seconds of continuous driving.
  1. Poor adjustment of centered position of steering wheel
  2. Poor adjustment of front wheel alignment
  3. Temporary loss of steering angle zero point
C1445
The steering angle sensor zero point 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 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 a temporary loss of the steering angle zero point, such as when the power source voltage drops when the battery is removed, and confirm that this condition occurred.
  2. After replacing the brake actuator assembly, perform calibration (HILUX_TGN26 RM000000XHR073X.html).
HINT:
  1. When DTC U0073 and/or U0126 is output together with DTC C1439 and/or C1445, inspect and repair the trouble areas indicated by DTC U0073 and/or U0126 first (HILUX_TGN26 RM000000YUO0ECX.html).
  2. When the speed sensor or yaw rate sensor assembly has trouble, DTCs for the steering angle sensor may be stored even when the steering angle sensor is normal. When DTCs for the 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 sensor assembly first, and then inspect and repair the steering angle sensor.
1.CHECK DTC

  1. Clear the DTCs (HILUX_TGN26 RM000000XHV0CGX.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 (HILUX_TGN26 RM000004PEV002X.html).

  1. Drive the vehicle at a speed of 35 km/h (22 mph) and turn the steering wheel to the right and left, and then check that no speed sensor or yaw rate and acceleration sensor DTCs are output (HILUX_TGN26 RM000000XHV0CGX.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 acceleration sensor
    		C
    DTC is not output
    		D

    HINT:
    1. If there is a malfunction in the speed sensor or yaw rate sensor assembly, 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 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, such as when the power voltage drops.


B
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (HILUX_TGN26 RM000004PEM002X.html)

C
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (HILUX_TGN26 RM000000XHU08RX.html)

D
USE SIMULATION METHOD TO CHECK (HILUX_TGN26 RM000004QR7002X.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 wheel position are adjusted as a result of an abnormal centered position of the steering wheel, acquire the yaw rate 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 WHEEL POSITION (HILUX_TGN26 RM0000010MX01UX.html)
OK


3.RECONFIRM DTC

  1. Clear the DTCs (HILUX_TGN26 RM000000XHV0CGX.html).

  1. Turn the ignition switch off.

  1. Start the engine.

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

  1. Check if the same DTC is output (HILUX_TGN26 RM000000XHV0CGX.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:
    1. 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 zero point, such as when the power source voltage drops.


B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (HILUX_TGN26 RM000000XHU08RX.html)
A

END