Principles of 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.

Use the scan tool for the air suspension control module, or Super STAR II Tester for the EVO control module.