Question 1

Which of the following jobs is NOT a function of the ignition system?

Accepted Answer

A)  engaging the starter motor 
B)  generating a spark with enough heat to ignite the fuel 
C)  maintaining the spark long enough for total combustion of air and fuel 
D)  delivering the spark at the proper time to each cylinder on the compression stroke 
A)  engaging the starter motor 
B)  generating a spark with enough heat to ignite the fuel 
C)  maintaining the spark long enough for total combustion of air and fuel 
D)  delivering the spark at the proper time to each cylinder on the compression stroke A

Question 2

What are flash codes?

Accepted Answer

Flash codes are diagnostic codes that are displayed by the MIL indicator light as a series of on and off pulses. Often codes are displayed by jumping two terminals on the DLC or cycling the ignition key on and off several times.

Question 3

Higher compression ratios tend to speed up combustion.

Accepted Answer

A) True 
 B)False  True

Question 4

The misfire monitor is necessary protect to the ____________________from melting during a continuous misfire.

Accepted Answer

The answer of The misfire monitor is necessary protect to...

Question 5

List the steps in diagnosing a vehicle with an illuminated MIL light.

Accepted Answer

Interview customer
Check MIL operation
C

Question 6

Engine vacuum is being discussed. Technician A says that when the engine is operating under light loads, engine vacuum is low. Technician B says that engine vacuum is high when the engine is operated under heavy loads. 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 7

Only OBD-II equipped vehicles have a sixteen-pin DLC connector.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following is not a PCM output?

Accepted Answer

A)  solenoids 
B)  thermostats 
C)  lights (indicator) 
D)  relays 
A)  solenoids 
B)  thermostats 
C)  lights (indicator) 
D)  relays

Question 9

When there is a calibration update available for an OBD-II vehicle, the old EPROM is removed from its socket in the PCM and a new EPROM with the updated software is installed in its place.

Accepted Answer

A) True 
 B)False

Question 10

When the cylinders are deactivated on a displacement on demand system, _____.

Accepted Answer

A)  half of the cylinders continue to fire normally 
B)  oil pressure to the hydraulic lifters is increased, pumping up the lifters 
C)  both the intake and exhaust valves of the deactivated cylinders are held open 
D)  the injectors continue to fire, but because the manifold vacuum is so low, no fuel flows into the combustion chamber 
A)  half of the cylinders continue to fire normally 
B)  oil pressure to the hydraulic lifters is increased, pumping up the lifters 
C)  both the intake and exhaust valves of the deactivated cylinders are held open 
D)  the injectors continue to fire, but because the manifold vacuum is so low, no fuel flows into the combustion chamber

Question 11

Air/fuel ratios are being discussed. Technician A says that when the air fuel ratio is higher than 14.7 to 1 the engine produces more power. Technician B says that when the air fuel ratio is lower than 14.7 to 1 the engine uses less fuel. 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 12

The two types of ignition systems are EI [electronic ignition] and ______.

Accepted Answer

A)  MI [magneto ignition] 
B)  DI [distributor ignition] 
C)  MSI [multispark ignition] 
D)  GCI [ground circuit ignition] 
A)  MI [magneto ignition] 
B)  DI [distributor ignition] 
C)  MSI [multispark ignition] 
D)  GCI [ground circuit ignition]

Question 13

What is the function of the EVAP system monitor?

Accepted Answer

The EVAP system monitor tests

Question 14

What is the DLC and where is it found in modern vehicles?

Accepted Answer

The data link connector is the electrica

Question 15

The OBD-II system will illuminate the MIL if a failure is detected that will cause the emissions levels to exceed ____________________ times the allowable standards for that model year.

Accepted Answer

The answer of The OBD-II system will illuminate the MIL...

Question 16

Catalytic converter monitors are being discussed. Technician A says that if the converter is working, the downstream signal frequency should mirror the upstream sensor. Technician B says that the downstream sensor should provide a low-frequency voltage signal. 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 17

A ______________________ or _____________________ increases engine efficiency by forcing (pumping) more air into the cylinders.

Accepted Answer

turbocharger, superc

Question 18

On an OBD-II vehicle, the DLC connector is located _____.

Accepted Answer

A)  under the hood, on the left side inner fender 
B)  under the hood, on the right side inner fender 
C)  under the hood, in the fuse/relay box 
D)  under the dashboard, within arm's reach of the driver 
A)  under the hood, on the left side inner fender 
B)  under the hood, on the right side inner fender 
C)  under the hood, in the fuse/relay box 
D)  under the dashboard, within arm's reach of the driver

Question 19

EGR monitors are being discussed. Technician A says some EGR system monitors EGR flow by measuring the difference in pressure as the EGR gas flows through an orifice (restriction). Technician B says some EGR monitors measure the temperature of the EGR outlet to determine whether there is gas flowing through the EGR valve. 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 20

Which of the following is NOT an advantage of an electronic spark control system?

Accepted Answer

A)  It compensates for changes in engine (and sometimes outside air) temperature 
B)  It allows lower compression ratio engines to be equally as efficient as higher compression ratio engines 
C)  It makes changes many times faster than older (mechanical) systems 
D)  It has a feedback mechanism in which sensor readings allow it to constantly compensate for changing conditions 
A)  It compensates for changes in engine (and sometimes outside air) temperature 
B)  It allows lower compression ratio engines to be equally as efficient as higher compression ratio engines 
C)  It makes changes many times faster than older (mechanical) systems 
D)  It has a feedback mechanism in which sensor readings allow it to constantly compensate for changing conditions

Exam 24: Engine Performance Systems

Which of the following jobs is NOT a function of the ignition system?

What are flash codes?

Higher compression ratios tend to speed up combustion.

The misfire monitor is necessary protect to the ____________________from melting during a continuous misfire.

List the steps in diagnosing a vehicle with an illuminated MIL light.

Engine vacuum is being discussed. Technician A says that when the engine is operating under light loads, engine vacuum is low. Technician B says that engine vacuum is high when the engine is operated under heavy loads. Who is correct?

Only OBD-II equipped vehicles have a sixteen-pin DLC connector.

Which of the following is not a PCM output?

When there is a calibration update available for an OBD-II vehicle, the old EPROM is removed from its socket in the PCM and a new EPROM with the updated software is installed in its place.

When the cylinders are deactivated on a displacement on demand system, _____.

Air/fuel ratios are being discussed. Technician A says that when the air fuel ratio is higher than 14.7 to 1 the engine produces more power. Technician B says that when the air fuel ratio is lower than 14.7 to 1 the engine uses less fuel. Who is correct?

The two types of ignition systems are EI [electronic ignition] and ______.

What is the function of the EVAP system monitor?

What is the DLC and where is it found in modern vehicles?

The OBD-II system will illuminate the MIL if a failure is detected that will cause the emissions levels to exceed ____________________ times the allowable standards for that model year.

Catalytic converter monitors are being discussed. Technician A says that if the converter is working, the downstream signal frequency should mirror the upstream sensor. Technician B says that the downstream sensor should provide a low-frequency voltage signal. Who is correct?

A ______________________ or _____________________ increases engine efficiency by forcing (pumping) more air into the cylinders.

On an OBD-II vehicle, the DLC connector is located _____.

Which of the following is NOT an advantage of an electronic spark control system?

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A __ or _ increases engine efficiency by forcing (pumping) more air into the cylinders.