Question 1

What is the primary advantage of using a cold start fuel injector?

Accepted Answer

A)  It allows for a richer air/fuel ratio when starting a cold engine. 
B)  It allows more time for the fuel to vaporize when starting a cold engine. 
C)  It allows for the use of a lower octane fuel when starting a cold engine. 
D)  It allows the PCM to shut down the primary fuel injectors when starting a cold engine. 
A)  It allows for a richer air/fuel ratio when starting a cold engine. 
B)  It allows more time for the fuel to vaporize when starting a cold engine. 
C)  It allows for the use of a lower octane fuel when starting a cold engine. 
D)  It allows the PCM to shut down the primary fuel injectors when starting a cold engine. B

Question 2

Which GDI engine charge mode is used for providing a rich air-fuel ratio when the vehicle is under moderate-to-heavy load?

Accepted Answer

A)  Stratified charge mode with closed-loop fuel control 
B)  Stratified charge mode with open-loop fuel control 
C)  Homogeneous charge mode with closed-loop fuel control 
D)  Homogeneous charge mode with open-loop fuel control 
A)  Stratified charge mode with closed-loop fuel control 
B)  Stratified charge mode with open-loop fuel control 
C)  Homogeneous charge mode with closed-loop fuel control 
D)  Homogeneous charge mode with open-loop fuel control D

Question 3

Technician A says that European vehicles may have two data link connectors: an OBD II standardized DLC under the instrument panel and a manufacturer proprietary DLC designed for dealership scan tools. Technician B says that modern European vehicles will have a CAN data bus that will connect with the OBD II DLC. Who is correct?

Accepted Answer

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

Question 4

What is the principal input used by an L-Jetronic system to determine how much fuel to inject?

Accepted Answer

A)  Fuel pressure 
B)  Manifold pressure 
C)  Air flow 
D)  Intake temperature 
A)  Fuel pressure 
B)  Manifold pressure 
C)  Air flow 
D)  Intake temperature

Question 5

Cranking mode is being discussed. Technician A says extra injector pulses may be used to richen the mixture. Technician B says an extra injector may be used to richen the mixture. Who is correct?

Accepted Answer

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

Question 6

Motronic fuel systems are being discussed. Technician A says the fuel pump is directly controlled by the PCM. Technician B says some systems use a pulse damper to regulate fuel pressure. Who is correct?

Accepted Answer

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

Question 7

Which of these statements about knock sensors is correct?

Accepted Answer

A)  The sensor generates a voltage signal 
B)  The sensor generates a frequency signal 
C)  The sensor is located in the cylinder head 
D)  On V-type engines, one sensor is used 
A)  The sensor generates a voltage signal 
B)  The sensor generates a frequency signal 
C)  The sensor is located in the cylinder head 
D)  On V-type engines, one sensor is used

Question 8

The injectors are being serviced on a Bosch fuel injection system. Technician A says the seals often leak and should be inspected carefully any time the injectors are removed. Technician B says petroleum jelly is generally regarded as the best O-ring installation lubricant. Who is correct?

Accepted Answer

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

Question 9

Which sensor is commonly used on a Bosch Motronic system to allow the PCM to distinguish between engine misfire and an erratic crankshaft signal caused by rough road surfaces?

Accepted Answer

A)  Chassis accelerometer 
B)  MEMS gyrometer 
C)  Yaw sensor 
D)  VSS 
A)  Chassis accelerometer 
B)  MEMS gyrometer 
C)  Yaw sensor 
D)  VSS

Question 10

What is the principal difference between the L-Jetronic and LH-Jetronic systems?

Accepted Answer

A)  The method used to determine fuel delivery 
B)  The type of air flow sensor used 
C)  The type of injectors used 
D)  The type of management system used 
A)  The method used to determine fuel delivery 
B)  The type of air flow sensor used 
C)  The type of injectors used 
D)  The type of management system used

Question 11

The modern Motronic electronic transmission control is being discussed. Technician A says it momentarily retards ignition timing during transmission shifting. Technician B says the PCM controls the automatic transmission's shift points using spool-type shift valves. Who is correct?

Accepted Answer

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

Question 12

The Motronic system is able to perform a "plausibility" test on the MAF sensor. What does this mean?

Accepted Answer

A)  It compares the MAF sensor value to a predetermined value stored in the ROM memory 
B)  It compares the MAF sensor value to a calculated value based on air temperature and engine speed 
C)  It compares the MAF sensor value to a calculated value based on throttle position and engine speed 
D)  It compares the MAF sensor value to a calculated value based on throttle position and engine coolant temperature 
A)  It compares the MAF sensor value to a predetermined value stored in the ROM memory 
B)  It compares the MAF sensor value to a calculated value based on air temperature and engine speed 
C)  It compares the MAF sensor value to a calculated value based on throttle position and engine speed 
D)  It compares the MAF sensor value to a calculated value based on throttle position and engine coolant temperature

Question 13

Early Motronic idle speed controls are being discussed. Technician A says an idle air bypass device is used to increase idle speed when the engine is cold. Technician B says the rotary idle control valve is used to control idle speed at any engine temperature. Who is correct?

Accepted Answer

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

Question 14

Why does the main power relay on a Bosch Motronic fuel injection system contain a diode?

Accepted Answer

A)  To protect the PCM against voltage surges 
B)  To protect the PCM against accidental polarity reversals 
C)  To keep the relay energized in case of relay circuit driver failure within the PCM 
D)  Both A and B are correct 
A)  To protect the PCM against voltage surges 
B)  To protect the PCM against accidental polarity reversals 
C)  To keep the relay energized in case of relay circuit driver failure within the PCM 
D)  Both A and B are correct

Question 15

Which statement about a turbocharged engine Motronic system is correct?

Accepted Answer

A)  The system uses boost pressure reduction to control spark knock. 
B)  The system uses spark retard to control spark knock 
C)  Both statements are correct. 
D)  Neither statement is correct. 
A)  The system uses boost pressure reduction to control spark knock. 
B)  The system uses spark retard to control spark knock 
C)  Both statements are correct. 
D)  Neither statement is correct.

Question 16

Which of these inputs is NOT used by the PCM to modify the read-only map for ignition timing?

Accepted Answer

A)  Intake air temperature 
B)  Engine coolant temperature 
C)  Air flow 
D)  Throttle position 
A)  Intake air temperature 
B)  Engine coolant temperature 
C)  Air flow 
D)  Throttle position

Question 17

The pulse-width control map is being discussed. Technician A says it functions as the look-up table the PCM uses to determine injector pulse width. Technician B says the map values are stored in the PCM's read-only memory and cannot be modified. Who is correct?

Accepted Answer

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

Question 18

Bosch pulsed multipoint injection systems are being discussed. Technician A says the injectors may be operated sequentially. Technician B says the injectors may be operated in clustered groups. Who is correct?

Accepted Answer

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

Question 19

Which statement regarding air-fuel ratio is correct?

Accepted Answer

A)  The ideal air-fuel ratio is known as stoichiometric 
B)  The ideal air-fuel ratio is known as lambda 
C)  Both statements are correct. 
D)  Neither statement is correct. 
A)  The ideal air-fuel ratio is known as stoichiometric 
B)  The ideal air-fuel ratio is known as lambda 
C)  Both statements are correct. 
D)  Neither statement is correct.

Question 20

Which feature is unique to the Bosch K-Jetronic injection system?

Accepted Answer

A)  The injectors are electronically controlled 
B)  The opening of the air valve controls a fuel metering valve. 
C)  The system uses sensors to regulate fuel control 
D)  The system uses manifold pressure to determine engine load 
A)  The injectors are electronically controlled 
B)  The opening of the air valve controls a fuel metering valve. 
C)  The system uses sensors to regulate fuel control 
D)  The system uses manifold pressure to determine engine load

What is the primary advantage of using a cold start fuel injector?

Which GDI engine charge mode is used for providing a rich air-fuel ratio when the vehicle is under moderate-to-heavy load?

What is the principal input used by an L-Jetronic system to determine how much fuel to inject?

Cranking mode is being discussed. Technician A says extra injector pulses may be used to richen the mixture. Technician B says an extra injector may be used to richen the mixture. Who is correct?

Motronic fuel systems are being discussed. Technician A says the fuel pump is directly controlled by the PCM. Technician B says some systems use a pulse damper to regulate fuel pressure. Who is correct?

Which of these statements about knock sensors is correct?

The injectors are being serviced on a Bosch fuel injection system. Technician A says the seals often leak and should be inspected carefully any time the injectors are removed. Technician B says petroleum jelly is generally regarded as the best O-ring installation lubricant. Who is correct?

Which sensor is commonly used on a Bosch Motronic system to allow the PCM to distinguish between engine misfire and an erratic crankshaft signal caused by rough road surfaces?

What is the principal difference between the L-Jetronic and LH-Jetronic systems?

The modern Motronic electronic transmission control is being discussed. Technician A says it momentarily retards ignition timing during transmission shifting. Technician B says the PCM controls the automatic transmission's shift points using spool-type shift valves. Who is correct?

The Motronic system is able to perform a "plausibility" test on the MAF sensor. What does this mean?

Early Motronic idle speed controls are being discussed. Technician A says an idle air bypass device is used to increase idle speed when the engine is cold. Technician B says the rotary idle control valve is used to control idle speed at any engine temperature. Who is correct?

Why does the main power relay on a Bosch Motronic fuel injection system contain a diode?

Which statement about a turbocharged engine Motronic system is correct?

Which of these inputs is NOT used by the PCM to modify the read-only map for ignition timing?

The pulse-width control map is being discussed. Technician A says it functions as the look-up table the PCM uses to determine injector pulse width. Technician B says the map values are stored in the PCM's read-only memory and cannot be modified. Who is correct?

Bosch pulsed multipoint injection systems are being discussed. Technician A says the injectors may be operated sequentially. Technician B says the injectors may be operated in clustered groups. Who is correct?

Which statement regarding air-fuel ratio is correct?

Which feature is unique to the Bosch K-Jetronic injection system?

A Review of Electricity and Electronics

Computers in Cars

Common Components for Computerized Engine Control Systems

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

Asian Computerized Engine Controls

Filters

Exam 15: European Bosch Computerized Engine Controls

What is the primary advantage of using a cold start fuel injector?

Which GDI engine charge mode is used for providing a rich air-fuel ratio when the vehicle is under moderate-to-heavy load?

What is the principal input used by an L-Jetronic system to determine how much fuel to inject?

Cranking mode is being discussed. Technician A says extra injector pulses may be used to richen the mixture. Technician B says an extra injector may be used to richen the mixture. Who is correct?

Motronic fuel systems are being discussed. Technician A says the fuel pump is directly controlled by the PCM. Technician B says some systems use a pulse damper to regulate fuel pressure. Who is correct?

Which of these statements about knock sensors is correct?

The injectors are being serviced on a Bosch fuel injection system. Technician A says the seals often leak and should be inspected carefully any time the injectors are removed. Technician B says petroleum jelly is generally regarded as the best O-ring installation lubricant. Who is correct?

Which sensor is commonly used on a Bosch Motronic system to allow the PCM to distinguish between engine misfire and an erratic crankshaft signal caused by rough road surfaces?

What is the principal difference between the L-Jetronic and LH-Jetronic systems?

The modern Motronic electronic transmission control is being discussed. Technician A says it momentarily retards ignition timing during transmission shifting. Technician B says the PCM controls the automatic transmission's shift points using spool-type shift valves. Who is correct?

The Motronic system is able to perform a "plausibility" test on the MAF sensor. What does this mean?

Early Motronic idle speed controls are being discussed. Technician A says an idle air bypass device is used to increase idle speed when the engine is cold. Technician B says the rotary idle control valve is used to control idle speed at any engine temperature. Who is correct?

Why does the main power relay on a Bosch Motronic fuel injection system contain a diode?

Which statement about a turbocharged engine Motronic system is correct?

Which of these inputs is NOT used by the PCM to modify the read-only map for ignition timing?

The pulse-width control map is being discussed. Technician A says it functions as the look-up table the PCM uses to determine injector pulse width. Technician B says the map values are stored in the PCM's read-only memory and cannot be modified. Who is correct?

Bosch pulsed multipoint injection systems are being discussed. Technician A says the injectors may be operated sequentially. Technician B says the injectors may be operated in clustered groups. Who is correct?

Which statement regarding air-fuel ratio is correct?

Which feature is unique to the Bosch K-Jetronic injection system?

A Review of Electricity and Electronics

Computers in Cars

Common Components for Computerized Engine Control Systems

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

Asian Computerized Engine Controls

Filters