Question 1

Engine surging at idle may be caused by dirty fuel injectors.

Accepted Answer

A) True 
 B)False

Question 2

How are SFI injectors controlled by the PCM?

Accepted Answer

The answer of How are SFI injectors controlled by the...

Question 3

An injector balance will identify a restricted fuel injector.

Accepted Answer

A) True 
 B)False

Question 4

What could cause a fuel-injected engine to run on (diesel) after the vehicle is turned off?

Accepted Answer

The answer of What could cause a fuel-injected engine to...

Question 5

Technician A says that disconnecting the vehicle battery during diagnosis may erase the adaptive strategy from the PCM. Technician B says that a vacuum leak may be misdiagnosed as a fuel delivery problem. Who is correct?

Accepted Answer

A)  A only 
B)  B only 
C)  both A and B 
D)  neither A nor B

Question 6

On OBD II systems, failure to clear DTCs will result in the temporary disablement of the non-continuous system monitors.

Accepted Answer

A) True 
 B)False

Question 7

Why are OBD II vehicles equipped with a fuel system monitor?

Accepted Answer

The answer of Why are OBD II vehicles equipped with...

Question 8

What are four components that are supplied voltage by the ASD relay on some vehicles?

Accepted Answer

The answer of What are four components that are supplied...

Question 9

During engine operation, the crankshaft position sensor (CKP) identifies crankshaft position, engine speed, and:

Accepted Answer

A)  direction of crankshaft rotation 
B)  fluctuations in engine revolutions 
C)  fluctuations in engine revolutions. 
D)  camshaft speed

Question 10

If the RPM signal is lost on an electronic fuel-injected vehicle, which of the following conditions will exist?

Accepted Answer

A)  The ignition timing will be set to zero. 
B)  The PCM will go into backup mode base settings. 
C)  The engine will not run. 
D)  The vehicle will hesitate.

Question 11

How does the PCM task manager affect fuel delivery?

Accepted Answer

The answer of How does the PCM task manager affect...

Question 12

On a multiport fuel-injected vehicle, what could cause fuel pressure to remain constant when the throttle is opened rapidly?

Accepted Answer

The answer of On a multiport fuel-injected vehicle, what could...

Question 13

What would the engine operational problem be on a vehicle with a defective fuel pump relay if the vehicle has an oil pressure switch wired in parallel to the fuel pump relay?

Accepted Answer

The answer of What would the engine operational problem be...

Question 14

What effect could a plugged fuel system return line have on the fuel delivery system?

Accepted Answer

The answer of What effect could a plugged fuel system...

Question 15

A higher than normal idle speed may be caused by low system voltage.

Accepted Answer

A) True 
 B)False

Question 16

What is one reason for the requirement of high system fuel pressures in port fuel-injected vehicles?

Accepted Answer

The answer of What is one reason for the requirement...

Question 17

A rich air/fuel ratio may be caused by low fuel pump pressure.

Accepted Answer

A) True 
 B)False

Question 18

Disconnecting the vehicle battery during diagnosis may deprogram the radio.

Accepted Answer

A) True 
 B)False

Question 19

The term injection pulse width refers to:

Accepted Answer

A)  the off time of the fuel injector 
B)  the on time of the fuel injector 
C)  the voltage required to turn on the fuel injector 
D)  none of the above

Question 20

What is the purpose of the inertia switch in the fuel pump circuit?

Accepted Answer

The answer of What is the purpose of the inertia...

Exam 7: Fuel System and Related Input Sensorsoutput Actuators Diagnosis

Engine surging at idle may be caused by dirty fuel injectors.

How are SFI injectors controlled by the PCM?

An injector balance will identify a restricted fuel injector.

What could cause a fuel-injected engine to run on (diesel) after the vehicle is turned off?

Technician A says that disconnecting the vehicle battery during diagnosis may erase the adaptive strategy from the PCM. Technician B says that a vacuum leak may be misdiagnosed as a fuel delivery problem. Who is correct?

On OBD II systems, failure to clear DTCs will result in the temporary disablement of the non-continuous system monitors.

Why are OBD II vehicles equipped with a fuel system monitor?

What are four components that are supplied voltage by the ASD relay on some vehicles?

During engine operation, the crankshaft position sensor (CKP) identifies crankshaft position, engine speed, and:

If the RPM signal is lost on an electronic fuel-injected vehicle, which of the following conditions will exist?

How does the PCM task manager affect fuel delivery?

On a multiport fuel-injected vehicle, what could cause fuel pressure to remain constant when the throttle is opened rapidly?

What would the engine operational problem be on a vehicle with a defective fuel pump relay if the vehicle has an oil pressure switch wired in parallel to the fuel pump relay?

What effect could a plugged fuel system return line have on the fuel delivery system?

A higher than normal idle speed may be caused by low system voltage.

What is one reason for the requirement of high system fuel pressures in port fuel-injected vehicles?

A rich air/fuel ratio may be caused by low fuel pump pressure.

Disconnecting the vehicle battery during diagnosis may deprogram the radio.

The term injection pulse width refers to:

What is the purpose of the inertia switch in the fuel pump circuit?