Question 1

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?

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Question 2

How are SFI injectors controlled by the PCM?

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Question 3

What do OBD II regulations require regarding a fuel system monitor?

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Question 4

On a return-style fuel injection system, what could cause high fuel pressure, and what would the results be?

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Question 5

How can after market exhaust system modifications reduce fuel efficiency and power?

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Question 6

How does the PCM control the air/fuel ratio on fuel-injected engines?

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Question 7

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

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Question 8

Increasing injector pulse width has what effect on the air/fuel ratio?

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Question 9

How does the PCM task manager monitor and correct fuel delivery?

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Question 10

If a vehicle is not equipped with a mass air flow (MAF) sensor, how does the PCM determine the volume of the incoming air charge drawn into the combustion chamber?

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Question 11

The PCM makes what assumption regarding the availability of fuel at the injectors?

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Question 12

Why relieve the fuel pressure before disconnecting a fuel system component?

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Question 13

What is the scavenging process?

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Question 14

What are four components that are supplied voltage by the automatic shutdown (ASD) relay points in some vehicle systems?

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Question 15

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

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Question 16

Why have many manufacturers integrated a returnless fuel system into their fuel system designs?

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Question 17

What is the primary function of the fuel control system?

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Question 18

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

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Question 19

How does the fuel system monitor treat one-trip and two-trip faults detected in the fuel delivery system?

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Question 20

What is the most likely cause of a customer complaint of a rotten egg odor?

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Quiz 7: Fuel System and Related Input Sensors Output Actuators Diagnosis