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aantonopoulos aantonopoulos
wrote...
Posts: 38
Rep: 0 0
5 years ago
1.   The antilock braking system component most likely to sustain damage is the
     
A. hydraulic pump.
B. wheel speed sensor.
C. control module.
D. master cylinder.

2.   When observing wheel speed sensor output with an oscilloscope, most sensors should produce an AC sine wave that
     
A. develops flat spots or gaps as the wheel speed increases.
B. decreases in frequency and amplitude as wheel speed increases.
C. has a fluctuating pattern as the wheel speed increases.
D. increases in frequency and amplitude as wheel speed increases.

3.   The red brake warning lamp is dimly lit on a rear-wheel-drive pickup with RWAL. Which is the most likely cause?
     
A. Hydraulic system failure
B. Computer malfunction
C. Antilock braking system fault
D. Broken parking brake cable

4.   Technician A says that cell phone or CB antenna interference can disrupt the antilock braking system (ABS) control unit. Technician B says that many system problems can be located with a thorough visual inspection. Who is correct?
 
A. Technician A
B. Both Technicians A and B
C. Technician B
D. Neither Technician A nor B

5.   The maximum traction between a tire and the road occurs when the tire is
     
A. slipping 80–90%.
B. slipping 10–20%.
C. locked.
D. rotating freely.
 
6.   Tires slip about _______ percent during ABS braking.
     
A. 10
B. 5
C. 20
D. 30

7.   Technician A says that the traction control system shouldn't be diagnosed in the same way as the electronic stability control (ESC) system. Technician B says that using a spare tire on the drive wheel can set off the traction control and/or ESC amber warning light. Who is correct?
     
A. Technician B
B. Both Technicians A and B
C. Neither Technician A nor B
D. Technician A

8.   A diagnostic trouble code has been set for a fault with the lateral acceleration sensor or circuit. Which of the following tests could be performed to check whether the sensor is working?
     
A. Unbolt it and hold it sideways to see if the scan tool reads 0.0G.
B. Unplug it and see if the scan tool reads 1.0G.
C. Drive the vehicle in a circle to see if the scan tool reads 0.0G.
D. Unbolt it and hold it sideways to see if the scan tool reads 1.0G.
 
9.   Why would putting a larger tire on a vehicle interfere with the ABS operation?
     
A. The tire size doesn't affect ABS operation.
B. The wheel speed sensor on that wheel will give a slower speed reading than it should.
C. The wheel speed sensor on that wheel will give a faster speed reading than it should.
D. It will increase the air gap in the wheel speed sensor.

10.   An ABS-equipped vehicle that uses an electronic stability control (ESC) system will have _____ channel antilock braking system(s).
     
A. three
B. four
C. two
D. one

11.   An ABS amber warning light that comes on as soon as the vehicle starts indicates a
     
A. failed modulator solenoid.
B. blown ABS pump fuse.
C. bad wheel speed sensor.
D. low brake-fluid level.

12.   An ABS systems that use a conventional master cylinder and vacuum booster for power assist, what type of accumulator is used as a temporary storage reservoir for brake fluid?
     
A. Solenoid
B. Nitrogen-charged chamber
C. Spring-loaded diaphragm
D. This type of system doesn't use an accumulator.

13.   Two technicians are discussing installation of a new wheel speed sensor. Technician A says that the protective plastic on the tip of the unit should be left in place during installation. Technician B says that in some units, this plastic will be impossible to remove once installed and so it should be removed first. Which technician is correct?
     
A. Technician B only
B. Technician A only
C. Both Technician A and Technician B
D. Neither Technician A nor Technician B

14.   The hand-wheel position sensor is located
     
A. at the base of the steering column.
B. on the steering wheel.
C. on the airbag clock spring.
D. in the rack-and-pinion gear.

15.   For an antilock brake system (ABS) to function properly, the driver must _______ while steering the vehicle.
     
A. pump the brakes
B. apply the brakes very lightly
C. release the brakes
D. keep the brakes applied

16.   The _______ is common to vehicles equipped with an antilock braking system (ABS).
     
A. hydraulic control unit
B. pedal travel sensor
C. combination valve
D. pressure-relief valve

17.   Technician A says that a flashing electronic stability control (ESC) system light indicates when the ESC system is operating to help restore vehicle stability. Technician B says that vehicles using traction control systems can reduce engine torque in slippery driving conditions. Who is correct?
     
A. Both Technicians A and B
B. Neither Technician A nor B
C. Technician B
D. Technician A

19.   A quick diagnostic test of wheel speed sensors (WSS) on some Bosch antilock braking systems entails hoisting the vehicle and spinning each tire individually. If the WSS is working properly, what should happen?
     
A. None of the lamps should illuminate.
B. The red brake warning lamp should illuminate
C. The red brake warning lamp and the amber ABS warning lamp should illuminate.
D. The amber ABS warning lamp should illuminate

20.   A wheel speed sensor is producing lower than expected voltage as the wheel rotates. All of these are possible causes except
     
A. an incorrect sensor gap.
B. sensor disconnection.
C. low tire pressure.
D. sensor debris.



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Replies
wrote...
5 years ago
1.   The antilock braking system component most likely to sustain damage is the
    
A. hydraulic pump.
B. wheel speed sensor.
C. control module.
D. master cylinder.

2.   When observing wheel speed sensor output with an oscilloscope, most sensors should produce an AC sine wave that
    
A. develops flat spots or gaps as the wheel speed increases.
B. decreases in frequency and amplitude as wheel speed increases.
C. has a fluctuating pattern as the wheel speed increases.
D. increases in frequency and amplitude as wheel speed increases.

First is master cylinder.
Second is An AC sine wave that increases in frequency and amplitude as wheel speed increases.

Quote
20.   A wheel speed sensor is producing lower than expected voltage as the wheel rotates. All of these are possible causes except
     
A. an incorrect sensor gap.
B. sensor disconnection.
C. low tire pressure.
D. sensor debris.

low tire pressure.
wrote...
Valued Member
Educator
5 years ago
I'm continuing this post here...

https://biology-forums.com/index.php?topic=1824579.0

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