Sensors 2

Question 1

EGR reduces?

Answer 1

NOx

Question 2

What has no energy and will not combust?

Answer 2

Inert gas

Question 3

Where is the ERG located?

Answer 3

On or near intake with pipe to the exhaust manifold

Question 4

Common fault on the EGR?

Answer 4

Stick open or shut

Question 5

What does a stuck open EFR react?

Answer 5

Causes vacuum leak and engine with surge or stall

Question 6

How can an EGR be controlled?

Answer 6

Vacuum or electronically

Question 7

What sensor monitors the EGR?

Answer 7

The MAP sensor

Question 8

When is EGR open?

Answer 8

Cruise and deceleration

Question 9

VVT has more or tell EGR?

Answer 9

None

Question 10

What does the MAF measure?

Answer 10

Amount of air mass entering the engine

Question 11

Three types of MAF sensors?

Answer 11

Vane, Hot Film, and Hot Wire

Question 12

Hot wire MAR sensors have what kind of circuit?

Answer 12

Burn off

Question 13

How do you test the MAF?

Answer 13

Tap test

Question 14

On a MAF as voltage increases as air _____?

Answer 14

Increases

Question 15

Common fault with MAF?

Answer 15

Dirty sensor or faults (pirate) air

Question 16

Dirty sensor will read?

Answer 16

Rich

Question 17

False air will read?

Answer 17

Lean

Question 18

How do you clean MAF sensor?

Answer 18

Electronics cleaner

Question 19

Where is the MAF located?

Answer 19

Between air cleaner and throttle body

Question 20

What does the EGR do?

Answer 20

Adds exhaust into intake to lower cylinder temp

Question 21

What does the MAP sensor measure?

Answer 21

Engine vacuum which senses engine load

Question 22

When is air more dense?

Answer 22

Low altitude and low temperatures

Question 23

As vacuum increases voltage ____?

Answer 23

Decreases

Question 24

At idle what is vacuum?

Answer 24

High

Question 25

What is vacuum at WOT?

Answer 25

Zero

Question 26

Where is the MAP locates and how many wires?

Answer 26

Near intake manifold | 3 wire

Question 27

What does the MAP do and why?

Answer 27

Sense load, altitude EGR operation to adjust fuel and spark

Question 28

What is built into a BMAP?

Answer 28

Barometric pressure sensor

Question 29

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

Answer 29

One thy measures positive pressures also

Question 30

Common fault in MAP?

Answer 30

Vacuum line breaks going to sensor

Question 31

How do you test MAP?

Answer 31

Hook up vacuum gauge and apply vacuum and voltage should drop

Question 32

What are hydrocarbons?

Answer 32

Raw fuel

Question 33

What causes carbon monoxide?

Answer 33

Rich mixture will cause death

Question 34

What condition produces NOx?

Answer 34

Running lean | Above 2500 F

Question 35

How is smog formed?

Answer 35

Sunlight+HC+NOx

Question 36

What are the 3 main elements of the CAT

Answer 36

Platinum, palladium, and Rhodium

Question 37

What is the 4th element of the CAT?

Answer 37

Cerium and it stores 02

Question 38

What designs Do most CATs have?

Answer 38

Honey comb

Question 39

What are the first and second beds in the CAT?

Answer 39

1st is reduction bed 2nd is oxidation bed

Question 40

What does the reduction bed do?

Answer 40

Strips HC particles

Question 41

What does the oxidation bed do?

Answer 41

Odds oxygen to particles

Question 42

What three emissions do engines produce?

Answer 42

HC CO NOx

Question 43

Converter turns the emissions into what four things?

Answer 43

CO2 O2 H2O Nitrogen