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Block 4 > Sensors/gauges > Flashcards

Sensors/gauges Flashcards

1
Q

What is a passive sensor

A

A sensor that do not use current supplied by ecm
Generates its own voltage

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2
Q

What is an active sensor

A

A sensor that uses current supplied by ecm

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3
Q

What is reference voltage

A

Regulated voltage supplied to sensors from the ecm (typically 5v DC)

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4
Q

What resistance does a switch have in the closed position

A

Zero resistance in the closed position

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5
Q

What resistance does a switch have in the open position

A

Infinite resistance in the open position

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6
Q

What is a single pole single throw switch

A

Simplest digital signal
Open or closed
Trans neutralizer switch
Clutch switch
Brake switch
Pto switch

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7
Q

What is a pull up switch

A

A switch that is connected between ecm and battery positive

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8
Q

What is a pull down switch

A

A switch that is connected between ecm and negative ground

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9
Q

What is a thermistor

A

Temperature sensitive variable resistor to measure temperatures
Two wire sensor changes resistance in proportion to Temperature

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10
Q

Where is plastic body thermistor used?

A

For air temperature applications

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11
Q

Where is a brass body thermistor used

A

For liquid temperature applications

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12
Q

What is a negative coefficient thermistor

A

Resistance decreases as temperature increases

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13
Q

What is a positive temperature coefficient thermistor

A

Resistance increases as temperature increases

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14
Q

What is a rheostat

A

Two wire variable resistance sensors
Uses variable sliding contact moving along a resistive wire

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15
Q

Where is a rheostat used?

A

Sending units

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16
Q

How is a three wire sensor configured?

A

Ground provided through ecm
Signal return
Positive voltage reference proportional to physical value measured

17
Q

Are three wire sensors self diagnosing

A

Yes to an extent

18
Q

What is a potentiometer

A

A sensor that uses three wires with the signal wire connected to a wiper or sliding contact moving across a resistive material

19
Q

Where is a potentiometer used

A

Throttle position sensor
Measures travel of pedal

20
Q

Idle validation switches do what

A

Uses two switches to verify correct accelerator pedal movement

21
Q

Are dual path Throttle position sensors potentiometers?

A

Yes

22
Q

What is a strain gauge

A

A sensor that measures small change in resistance of tiny wires embedded in tiny glass block.

23
Q

Piezoresistive sensors

A

Rely on ability of certain mineral crystals to produce voltage or change resistance when compressed

24
Q

What is a variable capacitance pressure sensor

A

A sensor that uses distance between two plates to measure pressure

25
Q

What is a voltage generator

A

A passive sensor that produces analog signal of varying voltage or AC frequency

26
Q

What isba variable reluctance sensor

A

A sensor that measure rotational speed
Is a two wire sensor
Usually a speed sensor but can also be a position sensor

27
Q

What is a hall effect sensor

A

A sensor that measures rotational speed
Produces digital signal square waveform
Changes resistance in presence of magnetic field

28
Q

What is an oxygen sensor

A

As oxygen content rises voltage rises
Something to do with magic

29
Q

What is a nox sensor

A

Operates the same as an oxygen sensor but for nox

30
Q

What is a mass air flow sensor

A

A sensor that measures weight of air entering intake and also vapor content
As airflow across the sensor increases or decreases resistance increases or decreases

31
Q

What isbprove out sequence

A

A sequence that validates sensors are operating normally. This happens with key on engine off or cranking

32
Q

Mechanical gauges use what to operate?

A

Cables, air, fluid pressure

33
Q

Diameter of wire in a circuit is based on what?

A

Amperage and length

34
Q

What are the two classifications for measuring wire diameter

A

AWG- as gauge number increases diameter increases
Metric gauge system- as diameter of wire increases gauge increases

35
Q

What is the best way to solder two wires together

A

Western union splice

36
Q

A light operated through voltage drop does what?

A

Has voltage supplied to both terminals of the bulb, if battery voltage is equal to or high than charging system the voltage differential will cause the light to come on

37
Q

How does a mechanical ground switch operate

A

Normally closed switches which are opened when acted upon by oil or air pressure so when oil or air pressure drops it closes the switch comoelting the circuit to ground and activating the light

Block 4 (11 decks)

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