Question 1

Most often, how does the PCM energize an output actuator?

Accepted Answer

A)  It supplies 5 volts to the actuator 
B)  It supplies battery voltage to the actuator 
C)  It supplies secondary ignition voltage to the actuator 
D)  It completes the actuator's ground path 
A)  It supplies 5 volts to the actuator 
B)  It supplies battery voltage to the actuator 
C)  It supplies secondary ignition voltage to the actuator 
D)  It completes the actuator's ground path D

Question 2

Technician A says that a switch in a "pull-up circuit" provides voltage to the computer when it is closed. Technician B says that a switch in a "pull-down circuit" provides a ground to the computer when it is closed. Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both technicians 
D)  Neither technician 
A)  Technician A only 
B)  Technician B only 
C)  Both technicians 
D)  Neither technician C

Question 3

Which of the following sensors may be used in place of the speed density formula?

Accepted Answer

A)  MAP sensor 
B)  VAF meter 
C)  MAF sensor 
D)  DPFE sensor 
A)  MAP sensor 
B)  VAF meter 
C)  MAF sensor 
D)  DPFE sensor C

Question 4

Two technicians are discussing how to test a permanent magnet vehicle speed sensor. Technician A says that you should test the coil's resistance and compare it to specification. Technician B says that you should set your DVOM to the " DC volts " scale to test the sensor's ability to produce voltage. Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both technicians 
D)  Neither technician 
A)  Technician A only 
B)  Technician B only 
C)  Both technicians 
D)  Neither technician

Question 5

All of the following sensors vary resistance so as to modify a voltage signal EXCEPT a(n):

Accepted Answer

A)  potentiometer 
B)  NTC thermistor 
C)  zirconia oxygen sensor 
D)  piezoresistive diaphragm 
A)  potentiometer 
B)  NTC thermistor 
C)  zirconia oxygen sensor 
D)  piezoresistive diaphragm

Question 6

Which of the following types of sensors cannot be used as a RPM reference sensor?

Accepted Answer

A)  Potentiometer 
B)  Permanent magnet 
C)  Optical 
D)  Hall effect 
A)  Potentiometer 
B)  Permanent magnet 
C)  Optical 
D)  Hall effect

Question 7

What should you do when testing a knock sensor?

Accepted Answer

A)  Tap it lightly with a nonmetallic object while measuring the output 
B)  Tap it lightly with a metallic object while measuring the output 
C)  Tap it lightly with a nonmetallic object while measuring the input 
D)  Tap it lightly with a metallic object while measuring the input 
A)  Tap it lightly with a nonmetallic object while measuring the output 
B)  Tap it lightly with a metallic object while measuring the output 
C)  Tap it lightly with a nonmetallic object while measuring the input 
D)  Tap it lightly with a metallic object while measuring the input

Question 8

Technician A says that if a relay is normally open, it must be energized in order to complete the controlled circuit. Technician B says that if a solenoid-operated valve is normally closed, it must be energized in order to allow flow through it.Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both technicians 
D)  Neither technician 
A)  Technician A only 
B)  Technician B only 
C)  Both technicians 
D)  Neither technician

Question 9

What type of sensor is a throttle position sensor?

Accepted Answer

A)  Potentiometer 
B)  NTC thermistor 
C)  Piezoelectric diaphragm 
D)  Piezoresistive diaphragm 
A)  Potentiometer 
B)  NTC thermistor 
C)  Piezoelectric diaphragm 
D)  Piezoresistive diaphragm

Question 10

In the figure above, as the engine coolant temperature sensor's resistance decreases, how will the voltage signal to the computer change?

Accepted Answer

A)  The voltage signal decreases 
B)  The voltage signal increases 
C)  The voltage signal is unaffected 
D)  The sensor begins producing a digital frequency 
A)  The voltage signal decreases 
B)  The voltage signal increases 
C)  The voltage signal is unaffected 
D)  The sensor begins producing a digital frequency

Question 11

Which of the following best describes how a permanent magnet sensor operates?

Accepted Answer

A)  It modifies a reference voltage signal 
B)  It generates a DC analog voltage signal 
C)  It generates a DC digital voltage signal 
D)  It generates an AC voltage signal 
A)  It modifies a reference voltage signal 
B)  It generates a DC analog voltage signal 
C)  It generates a DC digital voltage signal 
D)  It generates an AC voltage signal

Question 12

A digital Hall effect sensor consists of all of the following EXCEPT :

Accepted Answer

A)  a shutter wheel with vanes and windows 
B)  a permanent magnet 
C)  a Hall effect crystal 
D)  a light emitting diode 
A)  a shutter wheel with vanes and windows 
B)  a permanent magnet 
C)  a Hall effect crystal 
D)  a light emitting diode

Question 13

How will an increase in temperature from 50oF to 220 oF affect the resistance of an NTC thermistor?

Accepted Answer

A)  The resistance decreases 
B)  The resistance increases 
C)  The resistance will be unaffected 
D)  The resistance should go to "infinity" 
A)  The resistance decreases 
B)  The resistance increases 
C)  The resistance will be unaffected 
D)  The resistance should go to "infinity"

Question 14

What scale on a DVOM should be used to test a Hall effect sensor's signal?

Accepted Answer

A)  An AC voltage scale 
B)  A DC voltage scale 
C)  A resistance scale 
D)  A diode test scale 
A)  An AC voltage scale 
B)  A DC voltage scale 
C)  A resistance scale 
D)  A diode test scale

Question 15

What voltage will be produced by a zirconia O2 sensor when the air-fuel ratio is on the rich side of stoichiometric?

Accepted Answer

A)  0 mV to 100 mV 
B)  100 mV to 250 mV 
C)  250 mV to 450 mV 
D)  450 mV to 900 mV 
A)  0 mV to 100 mV 
B)  100 mV to 250 mV 
C)  250 mV to 450 mV 
D)  450 mV to 900 mV

Question 16

What does a digital Hall effect sensor do?

Accepted Answer

A)  Senses engine speed and crankshaft position 
B)  Measures the amount of free oxygen in the exhaust 
C)  Detects temperature changes in engine coolant 
D)  Monitors barometric pressure 
A)  Senses engine speed and crankshaft position 
B)  Measures the amount of free oxygen in the exhaust 
C)  Detects temperature changes in engine coolant 
D)  Monitors barometric pressure

Question 17

Which of the following sensors cannot produce or generate a voltage signal?

Accepted Answer

A)  Zirconia dioxide oxygen sensor 
B)  Permanent magnet sensor 
C)  Piezoelectric sensor 
D)  Potentiometer 
A)  Zirconia dioxide oxygen sensor 
B)  Permanent magnet sensor 
C)  Piezoelectric sensor 
D)  Potentiometer

Question 18

If the vacuum hose to a MAP sensor were to rupture, what would the likely result be?

Accepted Answer

A)  The engine would continue to run well because the O2 sensor is the primary sensor 
B)  The PCM would go into open loop and run the engine excessively lean 
C)  The PCM would go into open loop and run the engine excessively rich 
D)  The PCM would see this sensor as being out of normal operating limits 
A)  The engine would continue to run well because the O2 sensor is the primary sensor 
B)  The PCM would go into open loop and run the engine excessively lean 
C)  The PCM would go into open loop and run the engine excessively rich 
D)  The PCM would see this sensor as being out of normal operating limits

Question 19

What is the "speed density formula" used to determine?

Accepted Answer

A)  How much air is entering the engine 
B)  How much fuel is entering the engine 
C)  How much exhaust back pressure is present 
D)  How much CO and HC is being produced during combustion 
A)  How much air is entering the engine 
B)  How much fuel is entering the engine 
C)  How much exhaust back pressure is present 
D)  How much CO and HC is being produced during combustion

Question 20

In the figure above, if there was an open at terminal "C", what would the voltage signal to the PCM be?

Accepted Answer

A)  0 volts 
B)  About 1½ volts 
C)  About 3½ volts 
D)  5 volts 
A)  0 volts 
B)  About 1½ volts 
C)  About 3½ volts 
D)  5 volts

Most often, how does the PCM energize an output actuator?

Technician A says that a switch in a "pull-up circuit" provides voltage to the computer when it is closed. Technician B says that a switch in a "pull-down circuit" provides a ground to the computer when it is closed. Who is correct?

Which of the following sensors may be used in place of the speed density formula?

All of the following sensors vary resistance so as to modify a voltage signal EXCEPT a(n):

Which of the following types of sensors cannot be used as a RPM reference sensor?

What should you do when testing a knock sensor?

Technician A says that if a relay is normally open, it must be energized in order to complete the controlled circuit. Technician B says that if a solenoid-operated valve is normally closed, it must be energized in order to allow flow through it.Who is correct?

What type of sensor is a throttle position sensor?

In the figure above, as the engine coolant temperature sensor's resistance decreases, how will the voltage signal to the computer change?

Which of the following best describes how a permanent magnet sensor operates?

A digital Hall effect sensor consists of all of the following EXCEPT :

How will an increase in temperature from 50^oF to 220 ^oF affect the resistance of an NTC thermistor?

What scale on a DVOM should be used to test a Hall effect sensor's signal?

What voltage will be produced by a zirconia O₂ sensor when the air-fuel ratio is on the rich side of stoichiometric?

What does a digital Hall effect sensor do?

Which of the following sensors cannot produce or generate a voltage signal?

If the vacuum hose to a MAP sensor were to rupture, what would the likely result be?

What is the "speed density formula" used to determine?

In the figure above, if there was an open at terminal "C", what would the voltage signal to the PCM be?

A Review of Electricity and Electronics

Computers in Cars

Common Operating Principles for Computerized Engine Control Systems

Introduction to Diagnostic Concepts and Diagnostic Equipment

Exhaust Gas Composition and Analysis

Understanding Obd Ii

Automotive Multiplexing and Networking of Computers

Hybrid and Electric Vehicles

Advanced Driver Assist Systems

Approach to Diagnostics

General Motors Computerized Engine Controls

Ford Motor Company Computerized Engine Controls

Chrysler Corporation Computerized Engine Controls

European Bosch Computerized Engine Controls

Asian Computerized Engine Controls

Filters

Exam 3: Common Components for Computerized Engine Control Systems

Most often, how does the PCM energize an output actuator?

Technician A says that a switch in a "pull-up circuit" provides voltage to the computer when it is closed. Technician B says that a switch in a "pull-down circuit" provides a ground to the computer when it is closed. Who is correct?

Which of the following sensors may be used in place of the speed density formula?

All of the following sensors vary resistance so as to modify a voltage signal EXCEPT a(n):

Which of the following types of sensors cannot be used as a RPM reference sensor?

What should you do when testing a knock sensor?

Technician A says that if a relay is normally open, it must be energized in order to complete the controlled circuit. Technician B says that if a solenoid-operated valve is normally closed, it must be energized in order to allow flow through it.Who is correct?

What type of sensor is a throttle position sensor?

In the figure above, as the engine coolant temperature sensor's resistance decreases, how will the voltage signal to the computer change?

Which of the following best describes how a permanent magnet sensor operates?

A digital Hall effect sensor consists of all of the following EXCEPT :

How will an increase in temperature from 50oF to 220 oF affect the resistance of an NTC thermistor?

What scale on a DVOM should be used to test a Hall effect sensor's signal?

What voltage will be produced by a zirconia O2 sensor when the air-fuel ratio is on the rich side of stoichiometric?

What does a digital Hall effect sensor do?

Which of the following sensors cannot produce or generate a voltage signal?

If the vacuum hose to a MAP sensor were to rupture, what would the likely result be?

What is the "speed density formula" used to determine?

In the figure above, if there was an open at terminal "C", what would the voltage signal to the PCM be?

A Review of Electricity and Electronics

Computers in Cars

Common Operating Principles for Computerized Engine Control Systems

Introduction to Diagnostic Concepts and Diagnostic Equipment

Exhaust Gas Composition and Analysis

Understanding Obd Ii

Automotive Multiplexing and Networking of Computers

Hybrid and Electric Vehicles

Advanced Driver Assist Systems

Approach to Diagnostics

General Motors Computerized Engine Controls

Ford Motor Company Computerized Engine Controls

Chrysler Corporation Computerized Engine Controls

European Bosch Computerized Engine Controls

Asian Computerized Engine Controls

Filters

How will an increase in temperature from 50^oF to 220 ^oF affect the resistance of an NTC thermistor?

What voltage will be produced by a zirconia O₂ sensor when the air-fuel ratio is on the rich side of stoichiometric?