Steering System

The electronic power assist steering (EPAS) system consists of the following:

• Steering column assembly which includes the power steering control (PSC) module electric motor and torque sensor
• Steering column shaft
• Rack-and-pinion steering gear
• Tie-rod ends

The EPAS system provides power steering assist to the driver by replacing the conventional hydraulic valve system with an electric motor coupled to the steering shaft. The motor is controlled by an electronic control unit (ECU) that senses the steering effort through the use of a torque sensor mounted between the steering column shaft and the steering gear. Steering assist is provided in proportion to the steering input effort and vehicle speed.

The rack and pinion steering gear, which is serviced as an assembly, is contained within a one-piece aluminum housing. The steering gear uses tie-rod ends to connect the gear to the wheel knuckles.