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Steering Angle Sensor Initialization Incomplete





BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1439/66,C1445/66: Steering Angle Sensor Initialization Incomplete
C1445/66 - 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 and the vehicle is driven at 40 km/h (25 mph) or more for approximately 10 seconds. The ECU also stores the previous zero point.

The steering angle sensor zero point malfunction warning will be canceled by turning the ignition switch off.





WIRING DIAGRAM









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 data, such as when the power source voltage drops when the battery is removed, and confirm whether this condition occurred.
* When U0073/94, U0123/62, U0124/69 and/or U0126/63 is output together with C1231/31, inspect and repair the trouble areas indicated by U0073/94, U0123/62, U0124/69 and/or U0126/63 first U0073.
* When the speed sensor or the yaw rate and deceleration sensor has trouble, 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 deceleration sensor are output together with DTCs for the steering angle sensor, inspect and repair the speed sensor and yaw rate and deceleration sensor first, and then inspect and repair the steering angle sensor Vehicle Stability Control System.
* When the steering angle sensor and/or yaw rate and deceleration sensor is replaced, perform zero point calibration for the applicable sensor(s) Calibration.
* When replacing the VSC actuator assembly, perform zero point calibration Calibration.

PROCEDURE

1. CHECK DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

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

(d) Drive the vehicle at a speed of 36 km/h (22 mph), turn the steering wheel to the right and left and check that no speed sensor or yaw rate and deceleration sensor DTCs are output Reading and Clearing Diagnostic Trouble Codes.

Result





HINT
* If there is a malfunction in the speed sensor or the yaw rate and deceleration sensor, a DTC may be output although the steering angle sensor is normal.
* If the speed sensor and the yaw rate and deceleration sensor DTCs are output simultaneously, repair the sensors and then inspect the steering angle sensor.
* 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 data, such as when the power source voltage drops.

D -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting

C -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Vehicle Stability Control System

B -- GO TO CAN COMMUNICATION SYSTEM CAN Communication System
A -- Continue to next step.

2. PERFORM STEERING ANGLE SENSOR ZERO POINT CALIBRATION

(a) Drive the vehicle straight ahead at 40 km/h (25 mph) or more for at least 10 seconds.

(b) 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 deceleration sensor zero point again after the adjustments are completed.

OK:

The centered position of the steering wheel is correctly set.

NEXT -- Continue to next step.

3. RECONFIRM DTC

(a) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result





HINT
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 -- END
A -- Continue to next step.

4. REPLACE STEERING ANGLE SENSOR

(a) Replace the steering angle sensor Removal.

NEXT -- Continue to next step.

5. PERFORM STEERING ANGLE SENSOR ZERO POINT CALIBRATION

(a) Drive the vehicle straight ahead at 40 km/h (25 mph) or more for at least 10 seconds.

(b) 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 deceleration sensor zero point again after the adjustments are completed.

OK:

The centered position of the steering wheel is correctly set.

NEXT -- Continue to next step.

6. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Start the engine.

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

(d) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result





B -- END

A -- REPLACE VSC ACTUATOR ASSEMBLY Removal
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