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Automotive > Sensors 2 > Flashcards

Sensors 2 Flashcards

1
Q

EGR reduces?

A

NOx

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2
Q

What has no energy and will not combust?

A

Inert gas

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3
Q

Where is the ERG located?

A

On or near intake with pipe to the exhaust manifold

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4
Q

Common fault on the EGR?

A

Stick open or shut

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5
Q

What does a stuck open EFR react?

A

Causes vacuum leak and engine with surge or stall

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6
Q

How can an EGR be controlled?

A

Vacuum or electronically

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7
Q

What sensor monitors the EGR?

A

The MAP sensor

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8
Q

When is EGR open?

A

Cruise and deceleration

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9
Q

VVT has more or tell EGR?

A

None

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10
Q

What does the MAF measure?

A

Amount of air mass entering the engine

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11
Q

Three types of MAF sensors?

A

Vane, Hot Film, and Hot Wire

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12
Q

Hot wire MAR sensors have what kind of circuit?

A

Burn off

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13
Q

How do you test the MAF?

A

Tap test

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14
Q

On a MAF as voltage increases as air _____?

A

Increases

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15
Q

Common fault with MAF?

A

Dirty sensor or faults (pirate) air

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16
Q

Dirty sensor will read?

A

Rich

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17
Q

False air will read?

A

Lean

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18
Q

How do you clean MAF sensor?

A

Electronics cleaner

19
Q

Where is the MAF located?

A

Between air cleaner and throttle body

20
Q

What does the EGR do?

A

Adds exhaust into intake to lower cylinder temp

21
Q

What does the MAP sensor measure?

A

Engine vacuum which senses engine load

22
Q

When is air more dense?

A

Low altitude and low temperatures

23
Q

As vacuum increases voltage ____?

A

Decreases

24
Q

At idle what is vacuum?

A

High

25
Q

What is vacuum at WOT?

A

Zero

26
Q

Where is the MAP locates and how many wires?

A

Near intake manifold

3 wire

27
Q

What does the MAP do and why?

A

Sense load, altitude EGR operation to adjust fuel and spark

28
Q

What is built into a BMAP?

A

Barometric pressure sensor

29
Q

What special MAP should do you need on a boosted engine?

A

One thy measures positive pressures also

30
Q

Common fault in MAP?

A

Vacuum line breaks going to sensor

31
Q

How do you test MAP?

A

Hook up vacuum gauge and apply vacuum and voltage should drop

32
Q

What are hydrocarbons?

A

Raw fuel

33
Q

What causes carbon monoxide?

A

Rich mixture will cause death

34
Q

What condition produces NOx?

A

Running lean

Above 2500 F

35
Q

How is smog formed?

A

Sunlight+HC+NOx

36
Q

What are the 3 main elements of the CAT

A

Platinum, palladium, and Rhodium

37
Q

What is the 4th element of the CAT?

A

Cerium and it stores 02

38
Q

What designs Do most CATs have?

A

Honey comb

39
Q

What are the first and second beds in the CAT?

A

1st is reduction bed

2nd is oxidation bed

40
Q

What does the reduction bed do?

A

Strips HC particles

41
Q

What does the oxidation bed do?

A

Odds oxygen to particles

42
Q

What three emissions do engines produce?

A

HC
CO
NOx

43
Q

Converter turns the emissions into what four things?

A

CO2
O2
H2O
Nitrogen

Automotive (2 decks)

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