UTI AD121-105 ENGINE SENSORS AND CONTROL SYSTEMS FINAL EXAM | STUDY GUIDE,
NOTES AND PRACTICE QUESTIONS
What are the characteristics of Passive Sensors? - correct answer ✔✔- Two wire
-three wire
- digital
-
What are the characteristics of active sensor? - correct answer ✔✔-generate their own signal
- do not require reference voltage to function
What are the characteristics of the Knock Sensor? - correct answer ✔✔- Piezoelectric disc
- converts engine vibration to into electrical signal
- adjusts engine timing to prevent detonation
What are the characteristics of Crankshaft position sensor? - correct answer ✔✔- variable
reluctance sensor
- informs control module of CKP
- determines when to inject fuel and start ignition
What are the characteristics of the Camshaft position sensor? - correct answer ✔✔- Determines
whcih cylinder should receive fuel and spark
- communicates information to control module to synchronize fuel injection and ignition coil
spark
What two types of thermistors are there? - correct answer ✔✔- Negative temperature
coeifficient (NTC)
- Positive temperature coefficient (PTC).
, When temperature increase the NTC thermistor resistance... - correct answer ✔✔decreases
When temperature incease, the PTC thermistor resistance - correct answer ✔✔increases
What are the characteristics of NTC sensor? - correct answer ✔✔- Wired with either one or two
wires
- Mounted into a solid component
- normally uses a 5-volt reference signal
- uses a monitored signal that measures voltage drop across thermistor
Are PTCS used as circuit protection devices? - correct answer ✔✔Yes
What are the characteristics of Knock Sensor? - correct answer ✔✔- constructed of a ceramic
disc made of crystal that is bonded to a metal diaphragm
- applied pressure creates voltage
- higher pressure results in higher output
- when pressure changes or is vibrating, it energizes the crystals that produces voltage pulses
that go the Enging control module
- should never be over-torqued
What does the knock sensor allow the ECM to do? - correct answer ✔✔- keep engine timing
advanced as possible
- increase engine performance
- allows different grades of fuel to be used because of this
What are the characteristics of Absolute pressure sensor? - correct answer ✔✔- Tests fo
absolute readings
NOTES AND PRACTICE QUESTIONS
What are the characteristics of Passive Sensors? - correct answer ✔✔- Two wire
-three wire
- digital
-
What are the characteristics of active sensor? - correct answer ✔✔-generate their own signal
- do not require reference voltage to function
What are the characteristics of the Knock Sensor? - correct answer ✔✔- Piezoelectric disc
- converts engine vibration to into electrical signal
- adjusts engine timing to prevent detonation
What are the characteristics of Crankshaft position sensor? - correct answer ✔✔- variable
reluctance sensor
- informs control module of CKP
- determines when to inject fuel and start ignition
What are the characteristics of the Camshaft position sensor? - correct answer ✔✔- Determines
whcih cylinder should receive fuel and spark
- communicates information to control module to synchronize fuel injection and ignition coil
spark
What two types of thermistors are there? - correct answer ✔✔- Negative temperature
coeifficient (NTC)
- Positive temperature coefficient (PTC).
, When temperature increase the NTC thermistor resistance... - correct answer ✔✔decreases
When temperature incease, the PTC thermistor resistance - correct answer ✔✔increases
What are the characteristics of NTC sensor? - correct answer ✔✔- Wired with either one or two
wires
- Mounted into a solid component
- normally uses a 5-volt reference signal
- uses a monitored signal that measures voltage drop across thermistor
Are PTCS used as circuit protection devices? - correct answer ✔✔Yes
What are the characteristics of Knock Sensor? - correct answer ✔✔- constructed of a ceramic
disc made of crystal that is bonded to a metal diaphragm
- applied pressure creates voltage
- higher pressure results in higher output
- when pressure changes or is vibrating, it energizes the crystals that produces voltage pulses
that go the Enging control module
- should never be over-torqued
What does the knock sensor allow the ECM to do? - correct answer ✔✔- keep engine timing
advanced as possible
- increase engine performance
- allows different grades of fuel to be used because of this
What are the characteristics of Absolute pressure sensor? - correct answer ✔✔- Tests fo
absolute readings
