System 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.
The steering force from the steering wheel is sent to the pinion shaft The torque sensor measures the difference between the force applied to the pinion shaft and the resistance to turning the wheels due to road friction The torque sensor converts steering torque input and its direction into voltage signals that are sent to the EPS control unit The EPS control unit uses these signals along with the engine and the vehicle speed signals from the PCM to calculate the direction and the amount of assist needed The EPS control unit then sends out the appropriate command to the EPS motor The EPS motor transmits its power through a ball screw mechanism to push the steering rack right or left