Circuit Operation

The Magna Steer (MSVA) module controls a bi-directional magnetic rotary actuator. The MSVA module is provided battery voltage from the I/P Fuse Block IGN 3 Fuse when the Ignition Switch is in the "RUN" position. The MSVA actuator, which is located in the Steering Gear, adjusts the amount of power steering assist to achieve a given level of driver effort to turn the vehicle. The MSVA 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 MSVA module receives vehicle speed from the Powertrain Control Module (PCM). If an open or short is present in CKT 345 (WHT) or CKT 1787 (GRY), the MSVA module will not operate. To monitor the frequency and duty cycle, connect a J39200 to the Data Link Connector (DLC), terminal 11.