Chapter 10 Flashcards
Describe the general operation of a magnetic reluctance (PM) wheel speed sensor.
The PM wheel speed sensor is a variable reluctance sensor that produces a voltage directly related to the rotational speed of the wheel
Describe the general operation of a magnetoresistive wheel speed sensor.
must have a 12 volt reference supplied to it by the Electronic Brake Control Module (EBCM). This voltage is modified to a changing frequency and sent back to the EBCM
Explain the job of wheel speed sensors in the ABS system.
The wheel speed sensors signal the EBCM about the speed of the wheels during braking
Describe the construction differences between the integrated ABS and the nonintegrated ABS.
In an integrated system the master cylinder is not replaceable without replacing the modulator
Describe the difference in the DBC-7 without TCS and the DBC-7 with TCS.
What can the Bosch ABS 9.0 unit control as far as braking/stability control enhancements?
Explain why some ABS systems no longer use proportioning valves.
What is the advantage of vehicle networking?
What is the first thing the traction control can do to help eliminate positive wheel spin?
If the EBCM senses wheel slip when the brakes are not applied, its first step is to request the PCM to reduce________ ________.
engine torque
The DBC-7 operates on ______ volts instead of _______ volts.
High-speed CAN, which is needed for “real time” computer interaction is rated at _______
1 Mb/second
A slow wheel as monitored by the wheel speed sensor will produce a ________frequency signal, whereas a faster wheel will cause a comparatively _______ frequency.
lower, higher
The ________ replaces the standard hydraulic proportioning valve found on many older vehicles.
The magnetoresistive sensor produces a _______ signal and has its own power supply. The amplitude of the signal is constant.
Magnetic lines of force are called ______ _______.
The Continental Teves Mk60/Mk70 system has hydraulic brake assist that increases pressure to the brakes whenever a _______ ________ is detected through the brake pedal sensor.
The hydraulic pump for the Bosch 9.0 system has ________ pistons instead of two that were used on earlier systems.
The TCS is designed to control wheel spin or ________ wheel slip.
Technician A says with digital signals only the frequency changes.
Technician B says an analog voltage signal is infinitely variable; in other words, it flows smoothly as it changes voltage levels.
Who is correct?
Sensors are being discussed.
Technician A says that sensors are used to measure some sort of physical action and change it to an electrical signal.
Technician B says that the simplest sensors are often on–off switches.
Who is correct?
Technician A says that an actuator converts mechanical action to electric energy.
Technician B says that an actuator uses electric current to perform a mechanical action.
Who is correct?
b
Actuators and sensors are being discussed.
Technician A says that a too low current may mean that an actuator or sensor is not functioning properly.
Technician B says that the controller cannot monitor actuator and sensor operation electrically.
Who is correct?
Command signals are being discussed.
Technician A says that automotive controllers (computers) are simple compared to those used at work or school.
Technician B says that most automotive computers work without sharing information with other computers on the network.
Who is correct?
While discussing TCS as an outgrowth of four-wheel four-channel ABS,
Technician A says most of the same components are used in both systems.
Technician B says the TCS also interfaces with the engine (PCM) and transmission (TCM) control modules to request that specific actions be taken.
Who is correct?
Technician A says that an integrated ABS unit has many serviceable parts.
Technician B says that the nonintegrated ABS has many serviceable parts.
Who is correct?
There are several different names in use for the ABS controller. All of the following names have been used except:
BACU
ICU
EBCM
CAB
While discussing ABS brakes,
Technician A says ABS is excellent in directional stability.
Technician B says ABS is excellent in directional control.
Who is correct?
Technician A says that PM generator (variable reluctance) sensor produces a digital signal.
Technician B says that a PM generator used an electromagnet as part of the sensor.
Who is correct?
