The Steering wheel angle sensor uses two sensors ( A-sensor and B-sensor ) to determine the direction of the rotation.
The main components of each sensor are LED, photo transistor and slit plate.
The slit plate, which has 45 holes, is installed between LED and photo transistor, and generates signals if slit plate rotates according to the steering wheel rotation.
The sensor signals are generated by photo transistor which is driven whenever the light passes through the holes. The HECU detects operating speed and direction of the steering wheel by this input signal, and the signal is used to input signal for anti-roll control.
The HECU monitors the signals of the steering angle sensor and if the abnormal signal is detected or the difference between the angle speed calculated from the other sensors and the the angle speed measured from the steering angle sensor is above a certain value, this DTC is set.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Signal Monitoring |
•
Incorrect calibration
•
Improper installation of steering angle sensor
•
Faulty steering angle sensor |
Enable Conditions |
•
There is the difference between a calculated angle speed and a measured angle speed.
•
During driving straight, the steering angle sensor offset is more than 55 degrees.
•
The angle of steering is out of the normal range. | |
Fail Safe |
•
Inhibit the ESP control and allow the ABS/EBD control.
•
The ESP warning lamp is activated. |
