Auto Chapter 6

Front 1

This sensor tells the exact location of the accelerator pedal.

Back 1

Accelerator Pedal Position (APP) Sensor

Front 2

The process of changing analog voltage signals to digital signals.

Back 2

Analog/Digital Conversion

Front 3

A voltage signal that is usually produced by input sensors and is continuously variable within a certain voltage range.

Back 3

Analog Voltage Signal

Front 4

A group of numbers assigned to digital voltage signals.

Back 4

Binary Coding

Front 5

Informs the computer that there is no load on the engine, as well as prevents the engine from starting unless the clutch is depressed.

Back 5

Clutch Pedal Position (CPP) Switch

Front 6

A voltage signal that is either on or off, high or low.

Back 6

Digital Voltage Signal

Front 7

An input sensor that sends a voltage signal to the computer in relation to coolant temperature.

Back 7

Engine Coolant Temperature (ECT) Sensor

Front 8

A valve that dilutes the intake charge with spent exhaust in order to cool combustion chamber temperatures.

Back 8

Exhaust Gas Recirculation (EGR) Valve

Front 9

A term used to describe a PCM's ability to control the activity of an actuator in response to input from sensors.

Back 9

Feedback

Front 10

Informs the PCM of the pressure inside the fuel tank for EVAP system tests.

Back 10

Fuel Tank Vapor Pressure Sensor

Front 11

A sensor that sends a voltage signal to the computer in relation to engine detonation.

Back 11

Knock Sensor (KS)

Front 12

Has the advantage of no contacts to wear or corrode and is referred to as a non-contact TP sensor.

Back 12

Linear Hall-Effect TP Sensor

Front 13

An input sensor that sends a voltage signal to the computer in relation to intake manifold vacuum.

Back 13

Manifold Absolute Pressure (MAP) Sensor

Front 14

A thermistor that reduces its resistance as temperature decreases.

Back 14

Negative Temperature Coefficient (NTC)

Front 15

An input sensor that sends a voltage signal to the computer in relation to the amount of oxygen in the exhaust stream.

Back 15

Oxygen (0²) Sensor

Front 16

Informs the computer regarding gear selector position.

Back 16

Park Neutral Position (PNP) Switch

Front 17

Sensors that measure pressure changes.

Back 17

Piezoresistive

Front 18

A thermistor that increases its resistance as temperature increases.

Back 18

Positive Temperature Coefficient (PTC)

Front 19

A potentiometer with a pointer that is rotated by the throttle shaft that informs the PCM of the throttle position by varying voltage.

Back 19

Rotary-type Throttle Position (TP) Sensor

Front 20

This is used to control the throttle opening by the PCM. It has often been called "throttle by wire".

Back 20

Throttle Actuator Control (TAC)

Front 21

A sensor that is usually mounted in the transmission and sends a voltage signal to the computer in relation to the vehicle speed.

Back 21

Vehicle Speed Sensor (VSS)

Front 22

Digital devices will not operate with _?_ voltage inputs.

Back 22

Analog

Front 23

A digital voltage signal may be called a _?_ signal.

Back 23

Square-Wave

Front 24

The term binary means _?_ values.

Back 24

Two

Front 25

A reference voltage sensor provides input by _?_ or _?_ a constant, predetermined voltage signal.

Back 25

Modifying, Controlling

Front 26

There are two basic types of thermistors: _?_ and _?_.

Back 26

NTC, PTC

Front 27

In an 0² sensor, lean conditions produce _?_ voltage.

Back 27

Low (around 0.2 volts)

Front 28

If the coolant temperature increases, the voltage drop across the engine coolant temperature (ETC)

sensor _?_.

Back 28

Decreases

Front 29

The crankshaft position (CKP) sensor indicates the _?_ of the engine and the crankshaft _?_.

Back 29

RPM, Position

Front 30

The air-fuel (A/F) ratio sensor operates at _?_, about twice as hot as the conventional oxygen sensor.

Back 30

1,200 F°

Front 31

Tech A says that an analog signal is variable within a given voltage range.

Tech B says that a digital signal is either on or off.

Who is correct?

Back 31

Both Techs.

Front 32

Tech A says that the TP sensor is a reference voltage sensor.

Tech B says that the oxygen sensor is a voltage generating sensor.

Who is correct?

Back 32

Both Techs.

Front 33

The signal from most sensors must be amplified and converted from?

Back 33

Analog to digital.

Front 34

Tech A says that computer feedback is information sent back to the computer to confirm that a command was carried out by the actuator.

Tech B says that feedback can also be in the form of a monitored voltage signal to a switch or relay.

Who is correct?

Back 34

Both Techs.

Front 35

Tech A says that the air intake temperature (IAT) sensor signal is very similar to the engine coolant temperature signal.

Tech B says that cold intake air is denser than warm air.

Who is correct?

Back 35

Both Techs.

Front 36

Tech A says that the hall-effect switch contains an electromagnet.

Tech B says that the hall-effect switch also uses a shutter wheel connected to a rotational component.

Who is correct?

Back 36

Tech B.

Front 37

Tech A says that the oxygen sensor produces a high voltage signal when the exhaust is lean.

Tech B says that the oxygen sensor produces a low voltage signal when the exhaust is rich.

Who is correct?

Back 37

Neither. High voltage=Rich, Low Voltage=Lean.

Front 38

Tech A says that the air-fuel ratio sensor produces below 3.3 volts in a negative direction when the exhaust is rich.

Tech B says that the air-fuel ratio sensor operates at a lower temperature than the conventional oxygen sensor.

Who is correct?

Back 38

Tech A

Front 39

Tech A says that the intake air temperature (IAT) sensor is a voltage generating sensor.

Tech B says that the MAF sensor is a reference voltage sensor.

Who is correct?

Back 39

Neither. IAT is a voltage reference sensor.