The Magnasteer® system is a speed-dependent power steering system. The system provides power assist at varying levels depending on need. A bi-directional magnetic rotary actuator in the steering gear adjusts the amount of torque (driver effort) necessary in order to turn the steering wheel. This module varies the torque by adjusting the current flow through the actuator. The amount of adjustment is directly related to vehicle speed. The module receives speed-related input signals from the vehicle speed sensor.

The major internal components of the steering gear are:

The steering gear rack and pinion assembly is supported at its ends in the steering gear housing and sealed to prevent both external and internal leakage across the piston. The pinion and valve assembly intersects and meshes directly with the teeth of the rack and pinion assembly. Movement of the steering wheel is transferred through the pinion to the teeth on the rack and pinion assembly.

The movement of the steering gear assembly is aided by hydraulic pressure and fluid flow supplied by the power steering pump assembly. Pressurized fluid is directed by the steering gear valve to the rack and piston assembly through external lines. When the steering wheel is turned to the right, the steering gear valve is opened and routes pressurized fluid to the left side of the piston, while allowing fluid to escape from the right side and return to the valve area. The pressure of the fluid is converted to a mechanical force applied to the piston and the difference in force across the piston causes the rack to move to the right. The opposite occurs when the steering wheel is turned to the left.

Manual steering is maintained in the event of power steering pump or accessory drive belt failure. Under these conditions the steering effort will be increased.