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.
The HECU checks the CAN communcation lines for normal control and if a steering anlge sensor's message is not received for a certain period, this DTC is set.
Item | Detecting Condition | Possible cause |
DTC Strategy |
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CAN message monitoring |
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Faulty Steering Angle Sensor(SAS)
•
Open or short in CAN communication line |
Enable Conditions |
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When the steering anlge sensor's messages are not received for more than 0.5 second with a normal voltage condition | |
Fail Safe |
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Inhibit the ESP control and allow the ABS/EBD control.
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The ESP warning lamp is activated. |
