Circuit Operation

The Magna Steer (MVSA) module controls a bi-directional magnetic rotary actuator. The (MVSA) module is provided battery voltage from the I/P Fuse Block HVAC CONT Fuse when the Ignition Switch is in the "RUN" position. The MVSA actuator, which is located at the Steering Gear, adjusts the amount of power steering assist to achieve a given level of driver effort to turn the vehicle. The (MVSA) module varies the steering assist by adjusting the current flow through the actuator. The amount of steering assist needed for steering is dependent upon vehicle speed, as vehicle speed increases the steering assist decreases, and as vehicle speed decreases the steering assist increases. The (MVSA) module receives vehicle speed from the Powertrain Control Module (PCM). If an open or short is present in WHT (345) or GRY (1787) the (MVSA) module will not operate. To monitor the frequency and duty cycle, connect a J392O0 to the Data Link Connector (DLC), terminal 11.