Steering Angle Sensor Initialization Incomplete

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for BOSCH Made): C1439/31,C1445/31: Steering Angle Sensor Initialization Incomplete
C1445/31 - 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 to on (IG) and the vehicle is driven at 50 km/h (31 mph) or more for approximately 30 seconds. The ECU also stores previous zero points.

Warning of the steering angle sensor zero point malfunction will be cancelled by turning the ignition switch off.





WIRING DIAGRAM

Refer to DTCs U0073/94, U0100/65, U0123/62 and U0126/63 U Code Charts.

INSPECTION PROCEDURE

NOTICE:
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
* When U0073/94, U0123/62 and/or U0126/63 is output together with C1439/31 and/or C1445/31, inspect and repair the trouble areas indicated by U0073/94, U0123/62 and/or U0126/63 first U Code Charts.
* 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.

PROCEDURE

1. CHECK DTC

(a) Clear the DTCs Vehicle Stability Control System (for BOSCH Made).

(b) Turn the ignition switch off.

(c) Turn the ignition switch to on (IG) again and check that no CAN communication system DTCs are output Diagnosis System.

(d) Drive the vehicle and turn the steering wheel to the right and left at a speed of 50 km/h (31 mph) and check that no speed sensor and yaw rate and acceleration sensor DTCs are output Vehicle Stability Control System (for BOSCH Made).

Result:





HINT
* 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.
* If the speed sensor and the yaw rate and acceleration sensor DTCs are output simultaneously, repair the sensors and inspect the steering angle sensor.
* If the same DTC C1439/31 and/or C1445/31 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.

D -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System

C -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Vehicle Stability Control System (for BOSCH Made)

B -- INSPECT CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION

(a) Drive the vehicle straight ahead at 50 km/h (31 mph) or more for at least 30 seconds.

(b) Check if the centered position of the steering wheel is correctly set while driving straight ahead.

HINT
If 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 -- Continue to next step.

3. REPLACE STEERING ANGLE SENSOR

(a) Turn the ignition switch off.

(b) Replace the steering angle sensor Removal.

NEXT -- Continue to next step.

4. RECONFIRM DTC

(a) Clear the DTCs Vehicle Stability Control System (for BOSCH Made).

(b) Start the engine.

(c) Drive the vehicle and turn the steering wheel to the right and left at the speed of 50 km/h (31 mph) or more for at least 120 seconds.

(d) Check if the same DTC is recorded Vehicle Stability Control System (for BOSCH Made).

Result:





HINT
If the same DTC C1439/31 and/or C1445/31 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 Removal