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Exam 13: Rack and Pinion Steering Gears and Four Wheel Steering

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Question 1

Short Answer

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When the torsion bar twists, it changes the position of what?

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The spool valve.

Question 2

True/False

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During a right turn, the spool valve movement inside the rotary valve directs power steering fluid to the left side of the rack piston.

A) True
B) False

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False

Question 3

Multiple Choice

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If the lock-to-lock steering wheel rotation is 3:25 turns and the total front wheel movement is 78 degrees the steering ratio is:

In a center take-off rack and pinion steering gear, the tie rods are connected to the ends of the rack.

The breather tube in a rack and pinion steering gear allows air to flow from one bellows boot to the other boot during a turn.

What are the tie rods connected to on an end take-off power rack and pinion steering gear?

Technician A says when backing up a trailer, a four-wheel steering system on the tow vehicle provides better trailer response to vehicle steering inputs. Technician B says when towing a trailer, a four-wheel steering system on the tow vehicle reduces the articulation angle between the tow vehicle and the trailer during lane changes. Who is correct?

All of the following are true about a Magnasteer power steering system EXCEPT:

What are the two input sensors in an electronic variable orifice (EVO) steering system?

On a power steering rack system, a customer complains that the steering wheel is not level. The concern is verified during a road test. It is also noticed that the wheel is sometimes off to the right, and sometimes off to the left. The most likely cause of this condition is:

For an electronic variable orifice (EVO) steering system, describe the driving conditions required to provide high-power steering assistance.

If an electrical defect occurs in a 4WS system the:

Technician A says the steering system's ability to isolate road shock from the steering wheel is reduced when the number of friction points is reduced. Technician B says a steering system has increased road feel when the number of friction points is reduced. Who is correct?

Power rack and pinion steering gear operation are being discussed. Technician A says the position of the rotary valve inside the spool valve directs the fluid to the appropriate side of the rack piston. Technician B says during a right turn, fluid is directed to the right side of the rack piston and the rack is moved to the left. Who is correct?

In a rack and pinion steering gear, the rack maintains the tie rods in parallel position in relation to the lower controls arms.

Technician A says when a vehicle with an electronic variable orifice (EVO) steering system is operating below 10 mph and the steering wheel rotation is above 15 rpm, power steering assist is increased. Technician B says on this vehicle, power steering assist is decreased when the vehicle speed is above 25 mph. Who is correct?

In a center take-off power rack and pinion steering gear, the tie rods are attached to:

At low speeds, a vehicle with a four-wheel steering system has a shorter turning radius than a vehicle with conventional steering.

Electronic power steering (EPS) operation is being discussed. Technician A says the steering sensor informs the EPS control module regarding the direction of steering wheel rotation. Technician B says the interface in the steering sensor amplifies the DC voltage signal from the steering sensor. Who is correct?

Technician A says a power rack and pinion steering gear requires a breather tube to allow air to flow from one bellows boot to the other during a turn. Technician B says in a rack and pinion steering gear, a breather tube is connected between the bellows boots and the power steering pump return hose. Who is correct?