Expedition 4WD V8-281 4.6L SOHC (1998)
Steering Control Module: Description and Operation
Vehicles with air suspension use the air suspension control module to monitor steering control for the Electronic Variable Orifice (EVO) steering
system. Vehicles with base suspension use the EVO control module to monitor the steering system. Both systems on a panic or aggressive turn will
provide additional power assist. If there is any electrical system failure in the EVO system the system will default to full power assist.
