General Information

Component Location





General Description

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 this signal is used as input signal for anti-roll control.

DTC Description

The conformance of the yaw rate, lateral acceleration and steering angle signals dynamic is monitored by comparison of the signal shifts during curves. The function is started when a curve is detected after driving straight ahead for at least 1s. A curve is detected if 2 of the 3 signals exceed the following thresholds : (1.| Filtered yaw rate| > 4.0 ° / s, 2.|Filtered lateral accel. | > 0.15 g, 3.| Filtered steering angle | > 1.0 °) Due to the varying timing of signal changes, integrators are used to accumulate the signal's deviations from straight ahead driving. The signal changes are integrated separately. The integrated values are compared after a settling time of 2s.

DTC Detecting Condition





Schematic Diagram