General Information

C1260 Steering Angle Sensor Circuit-Signal

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

The HECU monitors signals of the steering angle sensor and if the measured angle from the sensor differs with the calculated angle, the ECU detects the failure and sets this code.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data




Fig 1) Normal waveform at turning the steering wheel