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	Note
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 (spiral cable with sensor sub-assembly) Acceleration sensor (yaw rate 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 (spiral cable with sensor sub-assembly) Acceleration sensor (yaw rate 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 DTC U0073, U0124 and/or U0126 is output together with DTC C1439 and/or C1445, inspect and repair the trouble areas indicated by DTC U0073, U0124 and/or U0126 first (See page BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS > VEHICLE STABILITY CONTROL SYSTEM > U0073 ).
When the speed sensor or the acceleration sensor (yaw rate sensor) has trouble, DTCs for the steering angle sensor (spiral cable with sensor sub-assembly) may be output even when the steering angle sensor (spiral cable with sensor sub-assembly) is normal. When DTCs for the speed sensor or acceleration sensor (yaw rate sensor) are output together with other DTCs for the steering angle sensor (spiral cable with sensor sub-assembly), inspect and repair the speed sensor and acceleration sensor (yaw rate sensor) first, and then inspect and repair the steering angle sensor (spiral cable with sensor sub-assembly).

PROCEDURE

CHECK DTC

Clear the DTCs.

Click here

Chassis > ABS/VSC/TRC > Clear DTCs
Turn the engine switch off.
Turn the engine switch on (IG) again and check that no CAN communication system DTCs are output.

for LHD: Click here

for RHD: Click here
Start the engine.

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 acceleration sensor (yaw rate sensor) DTCs are output.

Click here

Chassis > ABS/VSC/TRC > Trouble Codes

Tech Tips

If a speed sensor or the acceleration sensor (yaw rate sensor) is malfunctioning, DTCs for the steering angle sensor (spiral cable with sensor sub-assembly) may be stored even though the steering angle sensor (spiral cable with sensor sub-assembly) is normal.
If speed sensor and acceleration sensor (yaw rate sensor) DTCs are output simultaneously, repair these malfunctions and then inspect the steering angle sensor (spiral cable with sensor sub-assembly).
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 (spiral cable with sensor sub-assembly) zero point calibration, such as a loss of calibration due to the power source voltage being low.

Result

Result	Proceed to
DTCs C1439 and/or C1445 are output.	A
CAN communication system DTCs are output. (for LHD)	B
CAN communication system DTCs are output. (for RHD)	C
Speed sensor, acceleration sensor (yaw rate sensor) and/or steering angle sensor (spiral cable with sensor sub-assembly) DTCs are output.	D
DTCs C1439 and C1445 are not output.	E

INSPECT CAN COMMUNICATION SYSTEM Click here

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

USE SIMULATION METHOD TO CHECK Click here

CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION

Drive the vehicle straight ahead at 35 km/h (22 mph) or more for at least 5 seconds.

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 acceleration sensor (yaw rate sensor) zero point again after the adjustments are completed.

OK
The centered position of the steering wheel is correctly set.

Result

Proceed to
OK
NG

ADJUST FRONT WHEEL ALIGNMENT OR STEERING Click here

RECONFIRM DTC

Clear the DTCs.

Click here

Chassis > ABS/VSC/TRC > Clear DTCs
Turn the engine switch off.
Start the engine.
Drive the vehicle at a speed of 35 km/h (22 mph) or more and turn the steering wheel to the right and left.

Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRC > Trouble Codes

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.

Result

Result	Proceed to
DTCs C1439 and C1445 are not output.	A
Acceleration sensor (yaw rate sensor) and/or steering angle sensor (spiral cable with sensor sub-assembly) DTCs are output.	B

END

REPLACE CIRCUITS INDICATED BY OUTPUT DTCS Click here