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 seperately. And if the monitored time exceeds the specified min. fault duration, failure is detected. The monitoring starts 1sec after Power Up.

DTC Detecting Condition

Item

Detecting Condition

Possible cause

DTC Strategy

● Voltage Monitoring

● Open or short of steering wheel sensor circuit

● Faulty steering wheel sensor

● Faulty HECU

Detect Mode

● Initial Check

● Outside the ABS control cycle

● Inside the ABS control cycle

● Diagnosis mode

● Failure mode

Enable Conditions

● When Vsas >4.2±0.1V or Vsas<1.2±0.1V or 2.1±0.1V<Vsas<2.9±0.1V continue 1sec.

- The monitoring starts 1sec after Power Up.

Fail Safe

● Inhibit the ESP control and allow the ABS/EBD/TCS control.

Meanwhile, stop checking the ESP switch failure under the ESP control.

● The ESP warning lamps are activated.

Schematic Diagram
note
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