Torque Sensor Operation
WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
When the steering wheel is turned, inductance is changed by the movement of the core within the Torque Sensor The amount this voltage changes varies with the amount of movement, and direction of the core, then is amplified by the interface circuitry of the sensor coil and output to the EPS control unit as a steering signal