ASE Chp 8 and 9 practice

What function of the scan tool allows for testing the actuators? a. Activation test (bidirectional controls) b. Mode 6 c. Freeze frame d. All of the above

a. Activation test (bidirectional controls)

A low voltage on the pressure sensor's supply circuit could be caused by any of the following except: a. An open in the supply circuit wire. b. A short to ground in the supply circuit wire. c. High internal resistance in the sensor. d. Excessive voltage drop in the supply circuit.

a. An open in the supply circuit wire.

Flashing a BCM is being discussed. Technician A says a battery charger must be connected to maintain 12 volts during the entire flash procedure. Technician B says that most reprogramming procedures can be reverted to the original programming after it has been erased.. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

a. Technician A only

Technician A says RAM will store temporary information that can be read from or written to by the MP. Technician B says ROM can be written to and changed by the computer. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

a. Technician A only

Technician A says the microprocessor commands actuators by output drivers. Technician B says that outputs are never controlled by supplying voltage to the actuator. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

a. Technician A only

Technician A says the output of one computer can also be used as an input to another computer. Technician B says a sensor is an output device. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

a. Technician A only

Technician A says to test sensor signals, a breakout box can be used. Technician B says sensors can only be tested with a scan tool. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

a. Technician A only

A magnetic pulse generator uses electromagnetic induction to produce a voltage signal. a. True b. False

a. True

A stepper motor contains a permanent magnet armature. a. True b. False

a. True

A stepper motor may have two or four field coils. a. True b. False

a. True

Actuators are devices that perform work commanded by a computer. a. True b. False

a. True

An interface protects the computer from excessive voltage. a. True b. False

a. True

Feedback signals are used to confirm position and operation of an actuator. a. True b. False

a. True

Hard code failures are those that were detected the last time the BCM tested the circuit. a. True b. False

a. True

High resistance in the sensor return circuit can cause a faulty input from all sensors that use a shared circuit. a. True b. False

a. True

Linear or rotary movement can be measured by a potentiometer. a. True b. False

a. True

Magnetoresistive (MR) sensors consist of the magnetoresistive sensor element, a permanent magnet, and an integrated signal conditioning circuit to change resistance due to the relationship of the tone wheel and magnetic field surrounding the sensor. a. True b. False

a. True

The NOT gate reverses binary code output signals a. True b. False

a. True

The brain of the computer is the central processing unit. a. True b. False

a. True

The pull-up resistor assures the proper high voltage reading by connecting the voltage sense circuit to an electrical potential that can be removed when the switch is closed. a. True b. False

a. True

The resistive multiplex switch is used to provide multiple inputs from a single switch using one sense circuit. a. True b. False

a. True

Pressure switches will usually use a(n) ____ that works against a calibrated spring or other form of tension. a. diaphragm b. electromagnet c. lever d. piezoelectrical device

a. diaphragm

Most computer-controlled actuators are ____ that convert the output commands from the computer into mechanical action. a. electromechanical devices b. switches c. sensors d. valves

a. electromechanical devices

Most motion and speed sensors use a(n) ____ as the sensing element or sensed target to detect rotational or linear speed. a. magnet b. photo cell c. accelerometer d. ammeter

a. magnet

The ____ is the brain of the computer. a. microprocessor b. A/D converter c. program d. interface circuit

a. microprocessor

A potentiometer sensor can be used to measure linear or ____ movement. a. rotary b. stationary c. feedback d. roll-over

a. rotary

One form of feedback is for the computer to monitor ____ as a switch, relay, or other actuator is activated. a. voltage b. resistance c. capacitors d. gauges

a. voltage

High-side drivers complete the actuator control circuit to ground. a. True b. False

b. False

Switches are computer output devices. a. True b. False

b. False

The capacitance discharge sensor changes its capacitance by the difference in voltage between the electrodes. a. True b. False

b. False

The piezoelectric accelerometer generates an analog voltage proportional to vehicle speed. a. True b. False

b. False

The storage function of the computer is the same as converting analog to digital signals. a. True b. False

b. False

Which of the following is an example of a piezoelectric sensor? a. Oil pressure gauge sender unit b. Knock sensor c. Wheel speed sensor d. Coolant temperature sensor

b. Knock sensor

What is the Wheatstone bridge used to measure? a. Movement b. Mechanical strain c. Temperature d. All of the above

b. Mechanical strain

When inspecting magnetoresistive sensors, all of the following must be checked EXCEPT: a. Bias voltage b. Proper contact between the sensor and the tone wheel c. Proper mounting of the sensor d. Tone wheel teeth condition

b. Proper contact between the sensor and the tone wheel

A capacitance discharge sensor that produces a digital voltage signal of varying frequency is being discussed. Technician A says a voltmeter can be used to monitor the signal circuit output. Technician B says a DMM that has a frequency measurement function can be used to monitor the signal circuit output. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

b. Technician B only

Technician A says a pressure switch is used to monitor precise pressures. Technician B says if voltage is not present to the oil pressure switch with the ignition in the RUN position, the warning lamp bulb may be burned out. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

b. Technician B only

Technician A says it is a good practice to flash all controllers to the latest version. Technician B says the J2534-1 pass-thru device is a gateway between the vehicle's on-board computers and the shop's PC or laptop. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

b. Technician B only

Technician A says the output of a Hall-effect sensor can be checked with an AC voltmeter. Technician B says output of a magnetic pulse generator can be tested with a lab scope. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

b. Technician B only

Technician A says when servicing the BCM, a test light should be used to check for voltage. Technician B says before making or breaking electrical connections to the BCM, make sure the ignition switch is off. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

b. Technician B only

____ are the output of the self-diagnostics program in the form of alpha/numeric codes that indicate faulty circuits or components. a. Shared circuits b. Trouble codes c. Components and harnesses d. Computer malfunctions

b. Trouble codes

A ____ is a special tool that connects to the computer connectors to allow the technician to test circuits, sensors, and actuators by providing test points that will not damage the connectors. a. body computer b. breakout box c. circuit breaker d. backprobe

b. breakout box

Logic gates are the thousands of field effect transistors (FETs) incorporated into the computer ____. a. memory b. circuitry c. binary code d. programming

b. circuitry

Wear a(n) ____ to ground your body to prevent static discharges that may damage electronic components. a. insulated glove b. electrostatic discharge (ESD) wrist strap c. approved set of work shoes d. ground wire

b. electrostatic discharge (ESD) wrist strap

Piezoelectric devices are used to measure ____ by the generation of voltage. a. voltage drop b. pressures c. discharge rate d. temperature

b. pressures

A(n) ____ is a tool designed to communicate with the BCM. a. actuator b. scan tool c. sensor d. reader

b. scan tool

Pressure switch circuits are ____ type switches. a. transducer b. simple on-off c. sensor d. actuator

b. simple on-off

By monitoring the thermistor's resistance value, the computer is capable of observing very small changes in ____. a. current b. temperature c. gas d. voltage

b. temperature

Instead of using a silicon diaphragm, the capacitance discharge sensor uses a ___________ capacitor. a. transistorized b. variable c. photovoltaic d. resistive

b. variable

A high voltage on the three-wire potentiometer sensor's signal circuit would most likely be caused by which of the following? a. Group of answer choices b. An open in the supply circuit. c. An open in the signal circuit. d. A short to ground in the supply circuit.

c. An open in the signal circuit.

Magnetically coupled linear sensors used for fuel level sensing are being discussed. Technician A says a magnet is attached to the float arm and when the magnetic field passes the comb, the fingers are pulled against the resistor card contacting resistors that represent the various levels of fuel. Technician B says different contact sites on the strip produce different resistances that are used to determine the fuel level. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

c. Both Technician A and B

Technician A says a NOT gate simply reverses binary ones to zeros and vice versa. Technician B says AND gate operation is similar to two switches in series to a load. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

c. Both Technician A and B

Technician A says an accelerometer may be mass-type, roller-type, or solid-state. Technician B says when a photodiode is in the photo conductive mode, it is reverse biased when no light is applied. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

c. Both Technician A and B

Technician A says the phototransistor uses the application of light to generate carriers to supply the base leg current. Technician B says photoelectric sensors use light-sensitive elements to detect rotation. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

c. Both Technician A and B

____ means allowing the vehicle to sit without the engine running long enough that the coolant temperature equalizes with ambient temperature. a. Ramping b. Freezing c. Cold soak d. Ambient time

c. Cold soak

A(n) ____ either high side or low side is a transistor device that controls the current in the output circuit. a. Register b. Accumulator c. Driver d. Gate

c. Driver

____ occurs when the switch is open resulting in the input to the voltage-sensing circuit of the control module being susceptible to electrical noise that may cause the control module to misread the switch state a. Pull-up circuiting b. Pull-down circuiting c. Floating d. Multiplex switching

c. Floating

The operation of a computer is divided into four basic functions: ____. a. Addition, Subtraction, Multiplication, Division b. Sequence, Selection, Repetition, Output c. Input, Processing, Storage, Output d. Audio, Video, Calculate, Store

c. Input, Processing, Storage, Output

A ____ is a series-parallel arrangement of resistors between an input terminal and ground. Group of answer choices a. potentiometer b. piezoelectric device c. Wheatstone bridge d. Hall-effect sensor

c. Wheatstone bridge

All of the following are precautions to prevent static electricity damage when replacing a control module EXCEPT: a. Ground the package to a known good ground before opening. b. Open the package only when ready to install the component. c. Wipe the terminals clean before installing the component. d. Touch a known good ground before opening the package.

c. Wipe the terminals clean before installing the component.

The _______________ is a crystal that electrically vibrates to keep time when subjected to current at certain voltage a. microprocessor b. Starter c. clock d. accumulator

c. clock

It is becoming more common for manufacturers to use a(n) ____ temperature sensor instead of in-vehicle temperature sensors. a. analog b. surface c. infrared d. digital

c. infrared

A photo cell describes any component that is capable of measuring or determining ____. a. motion b. heat c. light d. temperature

c. light

The _______________ resistor assures the proper low-voltage reading by preventing float when the switch is open. a. pull-up b. transducer c. pull-down d. variable

c. pull-down

____ memory is the ability of the computer system to store changing values in order to correct operating characteristics. a. Random ringtones b. Keep near c. Voluntar d. Adaptive

d. Adaptive

Intermittent faults with sensors usually set a(n) ____. a. environmental data record b. freeze frame c. diagnostic trouble code (DTC) d. All of the above

d. All of the above

Magnetoresistive can be used in which systems? a. Antilock brake b. Navigational c. Lane change detection d. All of the above

d. All of the above

Which of the following is an actuator? a. A motor b. A relay c. A solenoid d. All of the above

d. All of the above

Using the bidirectional control function of the scan tool fails to make an actuator operate; which of the following could be the cause: a. Faulty scan tool. b. Open actuator ground circuit. c. Open power circuit to the actuator. d. All of the above.

d. All of the above.

Which of the following would NOT be considered a computer input? a. Throttle position sensor b. Magnetic pulse generator c. Park/Neutral switch d. EGR vent solenoid

d. EGR vent solenoid

____ refers to the sensor signal being as constantly proportional to the measured value as possible. a. Repeatability b. Accuracy c. Operating range d. Linearity

d. Linearity

____ induction sensors use the principle of inducing a voltage into a winding by use of a moving magnetic field. a. Electromechanical b. Potential c. Fluctuating d. Magnetic

d. Magnetic

Technician A says if the scan tool indicates that an actuator is being turned on and off, the actuator is working. Technician B says that DTCs can ONLY be retrieved by a scan tool. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

d. Neither Technician A nor B

Technician A says nonvolatile RAM will lose its memory if removed from its power source. Technician B says volatile RAM is not erased when it is disconnected from its power source. Who is correct? a. Technician A only b. Technician B only c. Both Technician A and B d. Neither Technician A nor B

d. Neither Technician A nor B

A transistor that operates as a relay is the basis of the ____ computer. a. analog b. binary c. interface d. digital

d. digital

If a malfunction results in improper system operation, the computer may minimize the effects by using ____ action. a. by-pass b. breaking c. shut down d. fail-safe

d. fail-safe

To ____ a computer means to remove the existing programming and overwrite it with new software. a. reset b. feed c. override d. flash

d. flash

The best way to test the performance of Hall-effect inputs is to use a(n) ____. a. ammeter b. DMM c. voltmeter d. lab scope

d. lab scope

of instructions the computer must follow to achieve desired results. a. analog signal b. digital signal c. circuit diagram d. program

d. program

A thermistor is a solid-state ____ made from a semiconductor material that changes resistance as a function of temperature. a. transducer b. voltage regulator c. conductor d. variable resistor

d. variable resistor