Chapter 12
A hydro-boost power steering system: a. Is used on many small front-wheel-drive vehicles. b. Uses pressure from the power steering pump to provide brake boost. c. Has a conventional vacuum brake booster. d. Has a very high-capacity power steering pump.
b
A power steering pump has the specified pressure with the pressure gauge valve closed. However, with this valve open, the pump does not have the specified pressure difference between the pressure readings at 1000 and 3000 rpm. The cause of this problem could be: a. A sticking pressure relief valve. b. A sticking flow control valve. c. A slipping pump belt. d. A misaligned pump pulley
b
A vehicle experiences excessive, erratic steering effort with a squealing noise. The most likely cause of this problem is: a. Underinflated and worn front tires. b. Power steering pump drive belt slipping on the pulley. c. Worn power steering pump mountings. d. Continual low power steering pump pressure
b
All of the following statements about multi-ribbed belts made of EPDM are true EXCEPT: a. EPDM belt is more elastic than a standard neoprene belt and resists cracking even at higher mileage. b. EPDM belts are designed to last 50,000- 60,000 miles. c. Belts are designed to have clearance between the rib peaks and the pulley grooves. d. EPDM belt to gradually lose material on the ribbing similar to the way a tire wears.
b
There is air in the power steering fluid. To correct this problem, you should: a. With the engine running, crack the pressure line at the pump to release trapped air. b. With the engine running, turn the steering wheel full left and right. c. With the engine running, drain all fluid from the system and refill. d. With the engine stopped, raise wheels and remove the return hose from the gear. Turn the steering wheel full left and right. Refill the reservoir and replace the return hose.
b
A vehicle has intermittent excessive steering effort. Technician A says inspect the fluid because it may have air in it. Technician B says inspect the belt because it may be slipping. Who is correct? a. A only b. B only c. Both A and B d. Neither A nor B
c
All of the following statements about hybrid electric vehicles that have an electrohydraulic power steering pump are true EXCEPT: a. The power steering pump has an electric-driven motor. b. A control module determines the amount of power assist required. c. An electric motor drives the steering gear. d. Some are sullied 42 V from the HEV inverter.
c
All of these statements about HEV service precautions are true EXCEPT: a. Open the high-voltage switch to isolate the high-voltage battery pack. b. High-voltage gloves must be worn when servicing HEV electrical systems. c. If the vehicle is not being driven, the high voltage battery pack must be vented manually. d. Remove the electronic or conventional key from the instrument panel.
c
All of these statements about a serpentine belt are true EXCEPT: a. A serpentine belt can be used to drive all the belt-driven components. b. The back of a serpentine belt can drive one component. c. A serpentine belt made of EPDM is susceptible to cracking. d. A serpentine belt can have an automatic belt tensioner.
c
All of these statements about integral-type power steering pump sealing are true EXCEPT: a. A large O-ring seal is positioned between the reservoir and the pump housing. b. A lip seal on the pump drive shaft prevents oil leaks around the shaft. c. Lip seals are mounted on bolt fittings on the back of the reservoir. d. The cap and dipstick provide a seal on the top of the reservoir neck.
c
All of these statements about power steering pump pulley replacement are true EXCEPT: a. If the pulley is retained with a nut, a woodruff key prevents pulley rotation on the shaft. b. If the pulley is pressed onto the shaft, a special puller must be used to remove the pulley. c. If the pulley is pressed onto the shaft, a soft hammer may be used to drive the pulley onto the shaft when reinstalling the pulley. d. If the pulley is misaligned with the engine running, the power steering pump mountings may be worn.
c
During normal power steering pump operation: a. The flow control valve spring moves this valve toward the open position. b. The fluid pressure from the outlet fitting venturi moves the flow control valve toward the open position. c. Pump flow increases as the engine speed increases. d. The pressure relief valve opens when the engine speed is increased with the front wheels straight ahead.
c
Technician A says that serpentine belts made of EPDM resist cracking and instead exhibit wear to the belt ribs similar to tire wear and that a depth gauge should be used to assess belt wear. Technician B says that as a Neoprene serpentine belt ages and wears, cracks form on the belt ribs, and if there are more than three cracks in a 3-in. span, the belt should be replaced. Who is correct? a. A only b. B only c. Both A and B d. Neither A nor B
c
While discussing power steering belt adjustment: Technician A says that all belt drive components are closely integrated and each depends on the belt and tensioner to keep the entire system at optimum operating performance. Technician B says a loose power steering pump drive belt may cause the steering wheel to jerk while turning. Who is correct? a. A only b. B only c. Both A and B d. Neither A nor B
c
While discussing power steering pump leaks: Technician A says leaks at the drive shaft seal will leave a wet and oily pump pulley back. Technician B says leaks at the drive shaft seal may leave oil on the hood pad above the pump. Who is correct? a. A only b. B only c. Both A and B d. Neither A nor B
c
All of the following are true EXCEPT: a. A loose belt may cause the steering wheel to jerk. b. If V-belt edges are worn, the belt may be stretched or the wrong width. c. An oil-soaked drive belt may slip only in wet weather. d. When air is in the fluid, the fluid will never reach operating temperature
d
All of these statements about power steering pump design and operation are true EXCEPT: a. An increase in fluid movement through the outlet fitting venturi causes a pressure decrease in the venturi. b. An increase in the flow control valve opening allows more fluid to return to the pump inlet. c. The rotor is attached to the pump shaft and must rotate with this shaft. d. Fluid pressure from the pump vanes moves the flow control valve toward the closed position.
d
In a hybrid electric vehicle (HEV) electrical system with an electrohydraulic power steering system (EHPS), a diagnostic trouble code (DTC) with U prefix represents a fault in the: a. EHPS module. b. Powertrain control module (PCM). c. Inverter. d. Vehicle network.
d
While discussing the steering pump pressure test: Technician A says the pressure gauge and valve should be connected in the power steering pump return hose to check pump pressure. Technician B says the pressure gauge valve should be closed for 30 seconds during the power steering pump pressure test. Who is correct? a. A only b. B only c. Both A and B d. Neither A nor B
d
A power steering system experiences repeated belt failures with normal power steering system operation. The most likely cause of this problem is: a. A misaligned power steering pump pulley. b. A loose power steering pump belt. c. Low fluid level in the power steering reservoir. d. A worn cam ring in the power steering pump.
a
A power steering system has the specified pressure with the pressure gauge valve closed or with the pressure gauge valve open and the engine running at 1000 and 3000 rpm. The power steering pump pressure is lower than specified with the front wheels turned fully in either direction. The cause of this problem could be: a. A defective steering gear. b. A stuck flow control valve. c. A stuck pressure relief valve. d. Worn pump vanes and cam ring.
a
A vehicle experiences repeated ruptures of the high-pressure power steering hose. The most likely cause of this problem is: a. A pressure relief ball sticking closed. b. A flow control valve sticking open. c. Worn pump vanes and cam ring. d. A partially restricted power steering return hose.
a
A vehicle has continual excessive steering effort, but there is no noise and the fluid level in the reservoir is correct. Technician A says the cause of the problem could be a stuck flow control valve. Technician B says the cause of the problem could be air in the power steering fluid. Who is correct? a. A only b. B only c. Both A and B d. Neither A nor B
a
The most likely result of a power steering drivebelt that is worn is: a. Belt slipping. b. Belt breaking. c. Belt contamination. d. Wear on the power steering pump pulley.
a
While discussing power steering system draining, flushing, refilling, and bleeding: Technician A says the return hose from the remote reservoir should be disconnected at the remote reservoir to drain the fluid. Technician B says the return hose should be loosened at the remote reservoir with the engine running to bleed air from the power steering system. Who is correct? a. A only b. B only c. Both A and B d. Neither A nor B
a
