Sensors 1

Question 1

Where is the throttle position sensor located

Answer 1

Adjacent to the throttle level

Question 2

What is the voltage on a throttle position sensor at idle

Answer 2

Roughly 0.5 volts

Question 3

What is the voltage of the throttle position sensor at WOT

Answer 3

4.5 volts

Question 4

What does the PCM adjust with the throttle position sensor

Answer 4

Fuel mixture and ignition timing

Question 5

What is a common fault with throttle position sensors

Answer 5

Burns a hole in the resister and causes a hesitation

Question 6

What does the ECT measure

Answer 6

Engine temperature

Question 7

What is the mixture of air to fuel when car is cold

Answer 7

Rich to prevent stalling

Question 8

Where is the engine coolant temp sensor located

Answer 8

Near the thermostat housing

Question 9

Negative temperature coefficient

Answer 9

Decreases in resistance as the temperature of the sensor increases

Question 10

What does a stepped resister do

Answer 10

Broadens the range of the ECT

Question 11

How many wires are there on a throttle position sensor

Answer 11

3 wire potentiometer

Question 12

What will a broken ECT read

Answer 12

-40 degrees F

Question 13

How many wires on an ECT

Answer 13

2

Question 14

What does a heated oxygen sensor measure

Answer 14

Oxygen content of the exhaust

Question 15

Pre-CAT adjusts…..

Answer 15

Fuel mixture

Question 16

Post-CAT monitors…..

Answer 16

CAT efficiency

Question 17

Pre cat volts

Answer 17

.1 to .9 volts .9 being rich

Question 18

Post cat volts

Answer 18

.4 to .6

Question 19

Zirconia HO2 sensor has how many wires

Answer 19

1

Question 20

Titania HO2 sensor has how many wires

Answer 20

4

Question 21

What can cause a false lean code

Answer 21

Exhaust leak

Question 22

What happens to HO2 sensors over time

Answer 22

Get lazy and slow

Question 23

What does a wide band O2 sensor read and how many wires

Answer 23

The air to fuel ratio and 5wires

Question 24

Closed loop is above how many degrees

Answer 24

160

Question 25

What does the PCM use an HO2 sensor in a closed loop for

Answer 25

Fuel control

Question 26

What does IAT sensor measure

Answer 26

Temperature of outside air

Question 27

Where is the IAT located

Answer 27

Air cleaner or air duct

Question 28

What does the intake air temperature sensor consist of

Answer 28

Plastic sensor Windows

Question 29

How many wires does an IAT sensor have

Answer 29

2