Steering: Description and Operation

GENERAL
The power steering system uses a CIII type pump and a power rack and pinion steering gear.
- The CIII power steering pump is a belt driven, vane-type, power steering pump mounted directly to the engine block with retaining bolts.
- The electronic variable orifice (EVO) power steering control valve actuator is connected to the pump body to provide variable power assist.
- The electrical connector and casing are able to swivel. This is normal and does not indicate a loose power steering control valve actuator assembly.
- The power steering pump reservoir for the power steering oil is mounted to the LH engine coil bracket at the front of the engine.

ELECTRONIC VARIABLE ORIFICE (EVO)
The EVO system controls the level of power steering assistance based on vehicle speed and the rate of change in the steering position.
- Greater power assistance is provided at lower speeds to lessen steering effort and increase maneuverability.
- Less power assistance is provided at higher speeds to raise the steering effort to increase directional stability and greater "road feel".
Steering effort increases with vehicle speed in a smooth and continuous manner in the mid-range speed, reaching a constant level at high rates of speed. A high rate of change in the steering wheel position, which might indicate an evasive maneuver, will result in an increase in the power assistance.

The EVO communications are integral with the Air Suspension control module.