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Home >> Chevrolet >> 2004 >> Optra5 Base, Automatic >> Repair and Diagnosis (Single Page) >> Steering >> Electronic Steering >> Variable Effort Steering System >> Description and Operation >> Variable Effort Steering System Description and Operation >> Power Rack and Pinion

Power Rack and Pinion

The design of the variable effort steering (VES) power rack and pinion assembly is the same as for a non-VES system, except for differences in valve machining. Steering wheel movement is transferred to the pinion. The pinion moves the rack left or right through meshing pinion and rack teeth. The force is then transmitted through the tie rod ends and steering knuckles in order to steer the wheels.

The power rack and pinion steering system has a rotary control valve. The valve directs hydraulic fluid from the power steering pump to one side or the other side of the rack piston. The piston is attached to the rack, and uses hydraulic pressure in order to move the rack left or right. The rotary control valve regulates the degree of assist by responding to the driver's torque input.

If the hydraulic assist is not available, manual control is maintained. When manual control is maintained, more steering effort is required.

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