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

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Question 21

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An electronic power steering (EPS) system is being discussed. Technician A says if the engine stalls and the ignition switch is on, the EPS remains operational. Technician B says if the steering wheel is turned and held fully in one direction, the power module reduces current flow through the steering gear motor to prevent motor overheating. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

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Question 22

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Why does an electronic variable orifice (EVO) steering system reduces power steering assist at higher speeds?

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Question 23

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In an electronic variable orifice (EVO) steering system, power steering assist is highest when driving at cruising speeds.

Explain the procedure for measuring steering wheel free play.

All of these statements about a power rack and pinion steering gear mounted behind the front wheel spindle are true EXCEPT:

Technician A says when installing the Teflon rings on the control valve in a rack and pinion steering gear, the rings may be heated with a propane torch. Technician B says when installing the Teflon rings on the control valve in a rack and pinion steering gear, an expansion tool may be used. Who is correct?

Explain the importance of rack bellows boot inspection and the required frequency of this inspection.

Rack and pinion steering gears have become commonplace on both passenger cars and light trucks.

The inside of both bellows boots are contaminated with power steering fluid on a rack and pinion steering gear. Technician A says if fluid is leaking past a rack seal into one boot, oil may flow through the breather tube to the opposite boot. Technician B says that there should be fluid in the bellows boot, and this is a normal condition. Who is correct?

During a right turn, what causes the power steering pump to force fluid into the right side of the rack chamber, and allow fluid to be removed from the left side of this chamber?

The power steering pump belt breaks on a rack and pinion power steering system. Under this condition:

Rack and pinion steering gear oil leak diagnosis is being discussed. Technician A says if oil leaks from the pinion end of the housing when the rack contacts the left internal stop, a defective inner rack seal is the problem. Technician B says if oil is leaking from the pinion end of the housing and it is not affected by steering wheel rotation, the pinion seal is leaking. Who is correct?

Explain the procedure that must be followed when removing a steering gear on an air bag-equipped vehicle.

Technician A says that on an electronically controlled four-wheel steering system, the rear wheels are steered in the same direction as the front wheels at vehicle speeds below 10 mph. Technician B says that on an electronically controlled four-wheel steering system, the rear wheels are steered in the opposite direction to the front wheels at speeds above 45 mph. Who is correct?

Describe the advantages and disadvantages of a rack and pinion steering system.

In a column-driven electric power steering system all of the following are true EXCEPT:

Technician A says steering effort imbalance on a power rack and pinion steering gear may be caused by worn rings on the rotary valve. Technician B says when turning the steering wheel to the right or left, low power steering assist may be caused by worn rings on the rotary valve. Who is correct?

What are the tie rods attached to on a center take-off power rack and pinion steering gear?

On a four-wheel steering (4WS) system, all of the following statements are true EXCEPT:

If the lock-to-lock steering wheel rotation is 3.5 turns, and the total front wheel movement during this rotation is 70 degrees, the steering ratio is 20:1.