Abstract: A throttle plate control system mounts a rotational position sensor directly to a throttle body structure to take advantage of vibration isolation provided for the throttle body structure. The configuration is compact and connects the throttle plate of the throttle body structure in force transmitting relation with a rotational position sensor by using a cam structure. A cam member is coupled to a movable portion of a rotational position sensor and a cam follower is rigidly attached to the throttle plate shaft within the throttle body structure. By shaping the cam surface of the cam member, a nonlinear relationship can be specifically predetermined in order to maximize the operation of a throttle control system.