Electronic Brake Control Final
On a vehicle with an electronic brake control module, if the yellow warning lamp is not illuminated and the brakes are not functioning properly, this could be a fault in the ____________________ system.
base brake
All of the following vehicle modifications can cause a concern with the electronic brake control system, EXCEPT:
driving on a space-saver spare tire
ABS systems require a scan tool to read ______________ codes from the EBCM.
fault
If there is a fault with the hydraulic control unit, typically the unit:
is not serviceable in the field
In an ABS hydraulic control unit, the ________________ and dump valves can be separate valves or they can be combined into a common assembly.
isolation
All of the following are typical methods of reducing power in the vehicle when the electronic brake control module requests reduced power, EXCEPT:
selecting a lower gear in the transmission
All of the following are typical sensors used by the electronic stability control system, EXCEPT:
the crash frontal sensor
Wheel speed sensors should be checked for which of the following with a DVOM?
All of the answers listed
Which of the following is likely to be in an electronic brake control module?
All of the answers listed
Technician A says that a wrong tire size installed on a vehicle can set a fault code in the electronic brake control module. Technician B says that you should use service information to determine how to diagnose the problems and locate the cause of faults in the electronic brake control system. Who is correct?
Both Technician A and Technician B
Technician A says that hill assist and hill descent controls are added features to some electronic stability control systems. Technician B says that trailer sway control is an added feature to some electronic stability control systems. Who is correct?
Both Technician A and Technician B
Technician A says that if the yellow warning lamp is illuminated indicating a fault in the electronic brake control system, you should retrieve the diagnostic trouble codes and follow the procedure listed in the service information. Technician B says that once the fault has been corrected, clear the diagnostic code and verify that it does not reset. Who is correct?
Both Technician A and Technician B
Technician A says that removing and installing electric and hydraulic components of the EBC system is normally only required when there is a fault within the HCU. Technician B says that many HCUs are nonserviceable; they will need to be replaced as a unit. Who is correct?
Both Technician A and Technician B
Technician A says that the ABS system is disabled when the ABS yellow warning lamp is on. Technician B says that when the ABS yellow warning lamp is on, the base brake system will work normally but without ABS function. Who is correct?
Both Technician A and Technician B
Technician A says that the most effective way to diagnose wheel speed sensor circuit faults is to utilize the live data function of your scan tool. Technician B says that once you have identified the affected circuit, the next step is to test at the sensor with a graphing multi-meter or an oscilloscope. Who is correct?
Both Technician A and Technician B
Technician A says that to depressurize high-pressure components of the electronic brake control (EBC) system, research the procedure for depressurizing the accumulator in the service information. Technician B says to remove the ABS fuse from the fuse box and apply the brake firmly at least 40 times when depressurizing the components of the EBC system. Who is correct?
Both Technician A and Technician B
Technician A says that wheel speed sensors are a highly probable cause of illuminated EBC warning lamps. Technician B says that using the diagnostic codes can help determine which wheel speed sensor or sensor circuit is at fault. Who is correct?
Both Technician A and Technician B
Technician A says that you can usually depressurize a brake accumulator by turning the ignition switch "off" to disable the electric pump and depress the brake pedal 30-50 times. Technician B says that you can use a scan tool to depressurize a brake accumulator. Who is correct?
Both Technician A and Technician B
Technician A states that a pressure bleeder may be needed to bleed EBC system hydraulic circuits. Technician B states that once the scan tool indicates that the HCU is bled, it may direct you to bleed the brakes manually to remove any remaining air from the system. Who is correct?
Both Technician A and Technician B
Technician A states that accident avoidance is an additional feature on some electronic stability control systems. Technician B states that trailer sway control is an additional feature on some electronic control systems. Who is correct?
Both Technician A and Technician B
Technician A states that accident avoidance works in conjunction with adaptive cruise control to monitor objects in front of the vehicle. Technician B states that if the electronic stability control (ESC) system detects an imminent collision, it can apply the brakes or boost the brake pressure over driver pressure. Who is correct?
Both Technician A and Technician B
Technician A states that on some vehicles, the brake switch sends an electronic signal to the brake lights. Technician B states that on some vehicles, the brake switch sends an electronic signal to the electronic brake control module. Who is correct?
Both Technician A and Technician B
Which of the following is LEAST likely to be an input to an electronic brake control module?
Crank Sensor
___________________ brake fluid should never be used in an EBC system unless the manufacturer clearly specifies it, as it is prone to aeration in the HCU.
DOT 5
Which of the following modules executes the commands of the anti-lock braking system control module?
Hydraulic control module
Technician A says that an anti-lock braking system pressure tester depresses the proportioning valve on some anti-lock braking systems while bleeding the brakes. Technician B says that the anti-lock braking system proportioning valve depressor allows the technician to test any pressure issue with the hydraulic control unit. Who is correct?
Neither Technician A nor Technician B
Technician A says that bleeding an electronic brake control system is just like bleeding a non-electronic brake control system if care is taken to never allow air to enter the hydraulic system. Technician B says that bleeding air manually from an electronic brake control system is easier than bleeding air from non-electronic brake control systems. Who is correct?
Technician A
Technician A says that in some cases, the electronic brake control module can be programmed with a new tire size to restore proper electronic brake control performance. Technician B says that there could be new brake power booster available for installation that matches a new tire size. Who is correct?
Technician A
Technician A says that some anti-lock braking systems do away with the mechanical proportioning valve. Technician B says that the electronic brake control module performs an automatic self-check and warning lamp bulb check on the anti-lock braking system every time the key is turned to the "off" position. Who is correct?
Technician A
Technician A says that to test variable reluctance sensors, you first should disconnect the suspected sensor, measure the resistance, and compare the readings to specifications. Technician B says that if the resistance does not meet specifications, overhaul the sensor. Who is correct?
Technician A
Technician A says that traction control systems can apply the brakes to reduce wheel slippage. Technician B says that some traction control systems can increase engine power to reduce wheel slippage. Who is correct?
Technician A
Technician A says that wheel speed sensors send electric signals to the electronic brake control module to determine the speed and rate of deceleration of each wheel. Technician B says that vehicle speed sensors send electric signals to the electronic brake control module to determine speed and rate of deceleration of each wheel. Who is correct?
Technician A
Technician A states that the tone wheel used on an anti-lock braking system's wheel speed sensors should be checked for broken teeth. Technician B states that the tone wheel used on an anti-lock braking system's wheel speed sensors should be checked for surface rust. Who is correct?
Technician A
Technician A says that a typical wheel speed sensor can be faulty due to worn out brake shoes. Technician B says that a typical wheel speed sensor could be faulty due to generating an improper sensor pattern. Who is correct?
Technician B
Technician A says that the traction control system was developed to prevent the drive wheels from slipping while the vehicle is being decelerated when coming to a stop. Technician B says that above a manufacturer-specified speed, the traction control system deactivates. Who is correct?
Technician B
Technician A states that some traction control systems can be temporarily deactivated by stepping on the brake pedal. Technician B states that traction control systems will automatically default back "on" during the next ignition switch cycle. Who is correct?
Technician B
Which of the following is LEAST likely to be used to diagnose an anti-lock braking system fault?
Test light
Typical hydraulic control units for electronic brake control systems can have how many channels?
Two, three, or four, depending on manufacturer's design
Which of the following typically reports the vehicle's speed to the electronic brake control module?
Vehicle speed sensor
Which of the following sensors operates similar to a Wii video game controller?
Yaw sensor
All of the following are typically added to an anti-lock braking system to gain traction control capabilities, EXCEPT:
additional wheel speed sensors beyond those used for ABS operation
The Department of Transportation required that all vehicles of less than 10,000 lb (4,536 kg) manufactured _________________ be equipped with electronic stability control.
after September 1, 2011
Wheel sensor assemblies are comprised of a toothed tone wheel and a pick-up assembly that do not touch each other. A(n) _____________________ must maintain a specific clearance between the two.
air gap
Many ESC-equipped vehicles monitor signals from other sensors as well to help prevent a loss of control of the vehicle. All of these sensors are used, EXCEPT:
air intake sensor
Many electronic stability control (ESC)-equipped vehicles monitor signals from other sensors as well to help prevent loss of control of the vehicle. All of these sensors are used, EXCEPT:
air intake sensor
