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EFI Diagnostics & Service

Authored by Lynn Reeves

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University

Used 3+ times

EFI Diagnostics & Service
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15 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A scan tool is used in diagnosis to observe ________.

-Long term fuel trim

-Short term fuel trim

-Idle air counts

-All of these

Long term fuel trim

Short term fuel trim

Idle air counts

All of these

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

All of these are types of injector circuits EXCEPT ________.

-Saturated switch

-Peak and hold

-Pulse width modulated

-All of these are types of injector circuits.

Saturated switch

Peak and hold

Pulse width modulated

All of these are types of injector circuits

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Fuel injectors can be tested using ________.

-An ohmmeter

-A stethoscope

-An oscilloscope

-Any of these

An ohmmeter

A stethoscope

An oscilloscope

Any of these

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How much voltage is generally available to fuel injectors (most vehicles)?

-Battery voltage

-5 Volts DC

-7 Volts DC

-10 Volts DC

Battery voltage

5 volts DC

7 volts DC

10 volts DC

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the throttle plate needs to be cleaned, what symptoms will be present regarding the operation of the engine?

-Stalls

-Rough idle

-Hesitation on acceleration

-Any of these

Stalls

Rough idle

Hesitation on acceleration

Any of these

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

On a vehicle with a mass airflow injection system, which of the following is likely to occur with a vacuum leak at idle?

-Lean fuel mixture

-Rich fuel mixture

-No fuel mixture change

-None of these

Lean fuel mixture

Rich fuel mixture

No fuel mixture change

None of these

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

On a vehicle with a speed density fuel injection system, which of the following is likely to occur with a vacuum leak?

-Increased idle speed

-Increased MAP sensor voltage

-Increased calculated load

-All of these are correct.

Increased idle speed

Increased MAP sensor voltage

Increased calculated load

All of these are correct

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