Steering System - Variable Assist: Description

The Electronic Variable Orifice (EVO) system is designed to regulate power steering effort according to vehicle speed and steering wheel rotation rate. The system provides full assist at low vehicle speed for light parking effort and minimum assist at high vehicle speed for improved handling and road feel. Full power steering assist returns during evasive maneuvers.

During periods of system malfunction, the system will provide full power steering assist at all times. Diagnostic codes are accessible through the service diagnostic connector, inside upper glove compartment. The EVO system consists of speed and steering sensors, a control module, an actuator and interconnecting wiring.