Question 1

Active sensors do not generate their own signal.

Accepted Answer

A) True 
 B)False  False

Question 2

If the charging system voltage is hovering near 11.6 volts, stepping on the brakes will turn on the brake lights, dropping the voltage further and causing the computer to raise engine idle.

Accepted Answer

A) True 
 B)False  True

Question 3

A(n) ____________________ in the service library provides a step-by-step diagnostic procedure to follow when troubleshooting hard-fault problems

Accepted Answer

diagnostic tree,flow chart

Question 4

What are the advantages of DMMs?

Accepted Answer

Advantages of DMMs are: 
- They have a d

Question 5

What three things must occur in order for a computer system to go into a closed loop?

Accepted Answer

Several things must occur for a computer

Question 6

Under what circumstances would a no-start condition occur?

Accepted Answer

A no-start condition can occur

Question 7

Which of the following is LEAST-Likely an actuator?

Accepted Answer

A)  Solenoid 
B)  Fuel Injector 
C)  Armature 
D)  Stepper motor 
A)  Solenoid 
B)  Fuel Injector 
C)  Armature 
D)  Stepper motor

Question 8

While having a discussion, Technician A says that an ohmmeter should be used to test an O2 sensor. Technician B says that you should not use an ohmmeter to test an O2 sensor. Who is correct?

Accepted Answer

A)  A only 
B)  B only 
C)  Both A and B 
D)  Neither A nor B 
A)  A only 
B)  B only 
C)  Both A and B 
D)  Neither A nor B

Question 9

While having a discussion, Technician A says that adaptive memory learns faster if the computer's memory is erased first. Technician B says that if memory is erased, it will take longer for the system to adapt. Who is correct?

Accepted Answer

A)  A only 
B)  B only 
C)  Both A and B 
D)  Neither A nor B 
A)  A only 
B)  B only 
C)  Both A and B 
D)  Neither A nor B

Question 10

To check a meter to see if it has high impedance, turn the selector to the direct current (DC) volts position.

Accepted Answer

A) True 
 B)False

Question 11

An ECT sensor is a thermistor; it will have lower resistance as coolant temperature rises. This is called a(n) ____________________ thermistor.

Accepted Answer

negative c

Question 12

An oscilloscope capable of displaying four waveforms is called a ____.

Accepted Answer

A)  four-channel scope 
B)  quadroscope 
C)  bidirectional scope 
D)  waveform scope 
A)  four-channel scope 
B)  quadroscope 
C)  bidirectional scope 
D)  waveform scope

Question 13

OBD II scan tools are powered through the ____________________ and do not require an external power source.

Accepted Answer

DLC,data l

Question 14

A scan tool is a portable computer that reads data from the on-board computer.

Accepted Answer

A) True 
 B)False

Question 15

To check a meter to see if it has high impedance, turn the selector to the ____________________ volts position.

Accepted Answer

direct cur

Question 16

The part MOST-Likely used to compare the reading inside the engine to an absolute pressure calibration in the computer is the:

Accepted Answer

A)  MAP sensor 
B)  BARO sensor 
C)  TPS sensor 
D)  Plenum 
A)  MAP sensor 
B)  BARO sensor 
C)  TPS sensor 
D)  Plenum

Question 17

All of the following statements are true EXCEPT:

Accepted Answer

A)  basic fuel delivery to the engine is determined by signals from the MAP sensor (load), CKP (rpm), and ECT (temperature). 
B)  a MAP sensor produces a voltage that drops as vacuum becomes higher. 
C)  barometric pressure (BARO) sensors are used on some systems to monitor changes in the weather or altitude. 
D)  load sensors include MAP, vacuum, and TPS. 
A)  basic fuel delivery to the engine is determined by signals from the MAP sensor (load), CKP (rpm), and ECT (temperature). 
B)  a MAP sensor produces a voltage that drops as vacuum becomes higher. 
C)  barometric pressure (BARO) sensors are used on some systems to monitor changes in the weather or altitude. 
D)  load sensors include MAP, vacuum, and TPS.

Question 18

Bidirectional means that the scan tool can read data but cannot give commands to the computer.

Accepted Answer

A) True 
 B)False

Question 19

What is the difference between a hard fault and an intermittent fault?

Accepted Answer

A hard fault is one that is present at t

Question 20

All of the following statements are true EXCEPT:

Accepted Answer

A)  to quickly evaluate compression, listen during cranking for an even rhythm and then for a smooth idle. 
B)  an EGR valve is open at idle during normal operation. 
C)  when an EGR valve is opened by a vacuum pump, the engine should stumble and run roughly. 
D)  a vacuum gauge is easy to connect and can be used to qualify engine condition. 
A)  to quickly evaluate compression, listen during cranking for an even rhythm and then for a smooth idle. 
B)  an EGR valve is open at idle during normal operation. 
C)  when an EGR valve is opened by a vacuum pump, the engine should stumble and run roughly. 
D)  a vacuum gauge is easy to connect and can be used to qualify engine condition.

Exam 46: Electronics and Computer Systems Service

Active sensors do not generate their own signal.

If the charging system voltage is hovering near 11.6 volts, stepping on the brakes will turn on the brake lights, dropping the voltage further and causing the computer to raise engine idle.

A(n) ____________________ in the service library provides a step-by-step diagnostic procedure to follow when troubleshooting hard-fault problems

What are the advantages of DMMs?

What three things must occur in order for a computer system to go into a closed loop?

Under what circumstances would a no-start condition occur?

Which of the following is LEAST-Likely an actuator?

While having a discussion, Technician A says that an ohmmeter should be used to test an O2 sensor. Technician B says that you should not use an ohmmeter to test an O2 sensor. Who is correct?

While having a discussion, Technician A says that adaptive memory learns faster if the computer's memory is erased first. Technician B says that if memory is erased, it will take longer for the system to adapt. Who is correct?

To check a meter to see if it has high impedance, turn the selector to the direct current (DC) volts position.

An ECT sensor is a thermistor; it will have lower resistance as coolant temperature rises. This is called a(n) ____________________ thermistor.

An oscilloscope capable of displaying four waveforms is called a ____.

OBD II scan tools are powered through the ____________________ and do not require an external power source.

A scan tool is a portable computer that reads data from the on-board computer.

To check a meter to see if it has high impedance, turn the selector to the ____________________ volts position.

The part MOST-Likely used to compare the reading inside the engine to an absolute pressure calibration in the computer is the:

All of the following statements are true EXCEPT:

Bidirectional means that the scan tool can read data but cannot give commands to the computer.

What is the difference between a hard fault and an intermittent fault?

All of the following statements are true EXCEPT:

Introduction to the Automobile

Automotive Careers and Technician Certification

Shop Safety

Shop Management, Service Records, and Parts

Locating Service Information and Specifications

Measuring Tools and Systems

Hardware, Fasteners, Drills, and Thread Repair

Shop Tools

General Shop Equipment

Cleaning Equipment and Methods

Lifting Equipment and Air Compressors

Engine Lubrication

Underhood and Body Inspection Car on Ground

Undercar Inspection and Service

Introduction to the Engine

Engine Classifications and Advanced Transportation Technologies

Engine Size and Measurements

Engine Upper End

Engine Lower End and Lubrication System Theory

Cooling System Theory

Cooling System Service

Automotive Belts

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Automotive Plumbing: Tubing and Pipe

Basic Electrical System Theory and Repairs

Battery Fundamentals

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Starting System Service

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Charging System Service

Lighting and Wiring Fundamentals

Lighting and Wiring Service

Safety, Security, Comfort Systems, and Electrical Accessories

Heating and Air Conditioning Fundamentals

Heating and Air Conditioning Service

Ignition System Fundamentals

Ignition System Service

Fuels and Alternative Fuels

Fuel System Fundamentals

Fuel System Service

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Emission Control System Fundamentals

Emission Control System Service

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Advanced Emissions and On-Board Diagnostics Odb

Diagnosing Engine Performance Problems

Diagnosing Engine Mechanical Problems

Engine Removal and Disassembly

Engine Sealing, Gaskets, Fastener Torque

Engine Diagnosis and Service: Cylinder Head and Valvetrain

Engine Diagnosis and Service: Block, Crankshaft, Bearings, and Lubrication System

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Ordering Parts, Short and Long Blocks, Engine Assembly

Engine Installation, Break In, and In-Chassis Repairs

Brake Fundamentals

Brakes Service

Anti-Lock Brakes Traction and Stability Control

Bearings, Seals, and Greases

While having a discussion, Technician A says that an ohmmeter should be used to test an O₂ sensor. Technician B says that you should not use an ohmmeter to test an O₂ sensor. Who is correct?