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 the signal is used to input signal for anti-roll control.

DTC Description

If some signal voltage stays in abnormal voltage range, the time is counted separately.
And if the monitored time exceeds the specified min. fault duration, failure is detected.
The monitoring starts 1sec after Power Up.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data








Fig.1) Normal waveform of Steering Angle Sensor with turning left after ENGINE "ON"
Fig.2) Normal waveform of Steering Angle Sensor with turning right after ENGINE "ON"