Variable Intake Manifold Control Motor (V.I. Motor): Description
WARNING: This page is about a different car, the 2004 Kia Amanti. However, it is still accessible from the selected car via links, so may be relevant.
Variable Intake Manifold Control System increases engine power especially in low engine speed by varying the intake length according to engine rpm and engine load.
It increases the torque by lengthening and shortening the intake length in low and high speed respectively.
Motor Rotation Sensor (MRS) sensors the rotation angle of motor and informs it of ECU.