Ch. 4

The saddle tank has _________ sending units.

2

Technician A says that if you turn on a wiper switch when the wiper blades are frozen to the window, there is no circuit protective device to prevent damage to the circuit if you continue to keep the switch on. Technician B says that the PTC thermistor would reach a high resistance and block current flow to prevent the wiper motor circuit from burning up.

B

(What sensor best fits the description? A. UEGO sensor B. titanium dioxide sensor C. zirconium sensor D. EGO sensor) single-wire O2 sensor

EGO sensor

(concerning position sensors) uses a linear variable resistor

EGR valve position sensor

Check for an open circuit between the gauge/light and the sending unit. Light stays on Gauge/light does not work?

Gauge/light does not work

Check for voltage to the gauge. Do the lights stay on or is it that the Gauge/light does not work?

Gauge/light does not work

Check the gauge/light for an open circuit. Light stays on Gauge/light does not work?

Gauge/light does not work

Digital sensors can also be known as what types of sensors?

Hall-effect

float magnet moves freely along the sensing rod

Magnetic

position of the float on the rod depends on the level of fuel in the tank

Magnetic

(What sensor best fits the description? A. UEGO sensor B. titanium dioxide sensor C. zirconium sensor D. EGO sensor) monitors current to calculate the air/fuel mixture

UEGO sensor

A signal current is applied to the sending unit

Variable Resistance

contains a fixed resistor

Variable Resistance

Which of the following two statements are true about PTC thermistors? When there is high heat, resistance is low. When there is low heat, resistance is high. When there is high heat, resistance is high.

When there is high heat, resistance is high.

Which of the following two statements are true about PTC thermistors? When there is high heat, resistance is low. or When there is high heat, resistance is high.

When there is high heat, resistance is high.

Which of the following statements are true about NTC thermistors? When there is high heat, resistance is low. When there is low heat, resistance is low. When there is high heat, resistance is high.

When there is high heat, resistance is low

Which of the following statements are true about NTC thermistors? When there is low heat, resistance is low. or When there is high heat, resistance is high.

When there is high heat, resistance is low.

(which type of pressure sensor best fits this description) has the ability to measure vacuum and pressure

absolute pressure sensor

(concerning position sensors) sends information to the ECM to control the position of the throttle plate

accelerator pedal position sensor

Technician A says NTC thermistors are used as circuit protection devices. Technician B says NTC thermistors are used as temperature sensors. Which technician is correct?

b

Technician A says that if the engine is cold, the ECT sensor will have high resistance. Technician B says that if there is high resistance, the ECM will see higher voltage. Which technician is correct?

both

(concerning position sensors) ECM uses information from this sensor to help control the ignition, fuel injection and variable valve timing systems

camshaft position sensor

What is the advantage to using an MAF sensor?

can calculate readings using a greater amount of air

Which position is the high pressure switch in under normal conditions?

closed

used to prevent vibration and false readings from the measuring plate

compensation plate

Which component of the high pressure switch is in constant contact with the diaphragm as the pressure increases?

contacts

(concerning position sensors) ECM uses this sensor to sense misfires during engine operation

crankshaft position sensor

results in the control module seeing a decreasing voltage (Concerning NTC thermistors You have these options to choose from. 1. decreasing resistance 2. high voltage drop 3. less voltage drop 4. increasing resistance).

decreasing resistance

A UEGO sensor monitors the air/fuel mixture in the __________ cavity.

detection

(which type of pressure sensor best fits this description) measures the difference between two or more pressures

differential

What is the disadvantage of a Karman vortex sensor?

dirty photocoupler may cause false reading

For a light and gauge system, the sending unit is screwed into what?

engine block

Where is the signal from the piezoelectric sensor sent?

engine control module (ECM)

The float magnet moves ________ along the sensing rod in a magnetic sending unit.

freely

For a light and gauge system, which one of the following is not utilized?

galley plug

(which type of pressure sensor best fits this description) most common sensor; measures with respect to atmospheric pressure

gauge pressure sensor

result of increasing resistance (Concerning NTC thermistors You have these options to choose from. 1. decreasing resistance 2. high voltage drop 3. less voltage drop 4. increasing resistance).

high voltage drop

uses electrical current to heat a platinum wire within the sensor

hot wire

results in the control module seeing an increasing voltage (Concerning NTC thermistors You have these options to choose from. 1. decreasing resistance 2. high voltage drop 3. less voltage drop 4. increasing resistance).

increasing resistance

Which sensor is a piezoelectric disc?

knock sensor

result of decreasing resistance (Concerning NTC thermistors You have these options to choose from. 1. decreasing resistance 2. high voltage drop 3. less voltage drop 4. increasing resistance).

less voltage drop

Check for low oil pressure. Light stays on Gauge/light does not work?

lights stay on

the signal sent to the gauge increases as the float moves closer to the electronic sensing head

magnetic

measures the amount of air the engine is ingesting

measuring plate

A variable resistance fuel sending unit uses a fixed resistor and __________ attached to a rod and float.

moving pole

Technician A says the reed switch sensor is used with anti-lock brake systems. Technician B says the pickup coil speed sensor produces a digital signal. Which technician is correct?

neither

Which application makes good use of a low pressure switch?

oil pressure warning lamp

An EGO sensor is excited by _________ in the exhaust system.

oxygen

The manifold absolute pressure, or MAP, sensor is what type of sensor?

passive three-wire

picks up light projection and sends a signal to the ECM

photocoupler

adjusts the voltage that is sent to the ECM

potentiometer

(which type of pressure sensor best fits this description) measures pressure relative to sea level atmospheric pressure

sealed pressure sensor

gives a constant baseline air temperature measurement

thermistor

(concerning position sensors) mounted on the throttle body, this sensor moves a wiper arm across a variable resistor

throttle position sensor

(What sensor best fits the description? A. UEGO sensor B. titanium dioxide sensor C. zirconium sensor D. EGO sensor) control module supplies a 5-volt reference to the element that acts as a variable resistor

titanium dioxide sensor

(which type of pressure sensor best fits this description) used when measured pressure is lower than the atmospheric pressure

vacuum gauge sensor

pivoting arm sweeps across

variable resistance

A titanium dioxide sensor acts as ________ that uses a 5 volt reference signal.

variable resistor

What happens to the voltage as pressure decreases in a piezoelectric sensor?

voltage decreases

What happens to the voltage as pressure increases in a piezoelectric sensor?

voltage increases

air flowing through the sensor passes by a bow, causing a disturbance

vortex generator

(What sensor best fits the description? A. UEGO sensor B. titanium dioxide sensor C. zirconium sensor D. EGO sensor) heated sensor that generates its own voltage

zirconium sensor