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

This monitoring function monitors the changing point of N-signal with measured steering angle from ST1 and ST2. If N-signal changing point differs more than 4degree, the failure is detected.
This monitoring function is prepared for the possibility of temporary SWAS (steering wheel angle sensor) signal defect caused by the power-supply or external environments. Because SWAS signal is not guaranteed for all situations that ESC-ECU working is guaranteed.
A failure is set if implausible steering wheel angle sensor signal is detected.

DTC Detecting Condition





Schematic Diagram