Automotive Engine Performance Post
Test Review Exam Questions &
Answers (Grade A+)
Magnetic pulse generators are commonly used to send data to the
computer about: -
correct answer ✅The speed of the monitored component.
Technician A says pulse width modulation (PWM) is measured in a
length of time, not a percentage of a cycle. Technician B says that
the cooling fan relay is usually controlled by the PCM through
PWM. Who is correct? -
correct answer ✅Both A and B
When the pressure in the intake manifold increases the fuel
pressure regulator on a port fuel injection system: -
correct answer ✅Increases fuel pressure.
Technician A says a P0300 is considered a generic DTC.
Technician B says a P1300 is considered a manufacturer specific
DTC. -
correct answer ✅Both A and B
The vent valve in an evaporative emissions system may be: -
correct answer ✅Opened to allow fresh air through the charcoal
,Automotive Engine Performance Post
Test Review Exam Questions &
Answers (Grade A+)
canister and closed with the purge valve open while the PCM
monitors the fuel tank pressure sensor for vacuum.
Technician A says the computer may activate a circuit by completing
the path to ground. Technician B says the computer may activate a
circuit by completing the path to power. Who is correct? -
correct answer ✅Both A and B.
Technician A states that non-contact type hall-effect sensors wear
out very quickly.
Technician B states that some throttle position sensors are non-
contact. -
correct answer ✅Technician B only.
The purpose of the PCV system is to: -
correct answer ✅Control emissions, relieve the engine's crankcase
of pressure and vapors, and reduce the formation of oil sludge.
Technician A says the crankshaft position sensor can be a Hall-effect
switch.
,Automotive Engine Performance Post
Test Review Exam Questions &
Answers (Grade A+)
Technician B says the crankshaft position sensor can be a magnetic
pulse generator.
Who is correct? -
correct answer ✅Both A and B.
Technician A says both the fuel injector and spark plug are turned
off when a cylinder is deactivated on a variable displacement
engine. Technician B says the spark plug may foul if is allowed to
become too cool during cylinder deactivation. Who is correct? -
correct answer ✅Technician B.
Technician A says that ion-sensing ignition systems are based on the
coil on plug system.
Technician B say that the ion-sensing ignition system uses the spark
plug itself as a sensor. Who is correct? -
correct answer ✅Both A and B.
The acceptable amount of ethanol mixed with conventional
gasoline is: -
correct answer ✅Up to 10%.
, Automotive Engine Performance Post
Test Review Exam Questions &
Answers (Grade A+)
True or False:
Long term fuel trim will change in an attempt to keep short term
fuel trim near 0. -
correct answer ✅True
Short-term fuel trim (STFT) adds or subtracts fuel to correct for: -
correct answer ✅Small or temporary changes and changes in the
O2 sensor signal.
Which of the following is false concerning variable valve timing
engines? -
correct answer ✅They utilize the camshaft (CMP) and crankshaft
(CKP) sensors to determine the amount of advance or retard.
Technician A says Mode 5 contains the tests for non-continuously
monitored systems. Technician B says Mode 6 contains the oxygen
sensor monitoring tests. Who is correct? -
correct answer ✅Neither A or B.
Which of the following is a pre-combustion emission control? -
correct answer ✅EVAP
Test Review Exam Questions &
Answers (Grade A+)
Magnetic pulse generators are commonly used to send data to the
computer about: -
correct answer ✅The speed of the monitored component.
Technician A says pulse width modulation (PWM) is measured in a
length of time, not a percentage of a cycle. Technician B says that
the cooling fan relay is usually controlled by the PCM through
PWM. Who is correct? -
correct answer ✅Both A and B
When the pressure in the intake manifold increases the fuel
pressure regulator on a port fuel injection system: -
correct answer ✅Increases fuel pressure.
Technician A says a P0300 is considered a generic DTC.
Technician B says a P1300 is considered a manufacturer specific
DTC. -
correct answer ✅Both A and B
The vent valve in an evaporative emissions system may be: -
correct answer ✅Opened to allow fresh air through the charcoal
,Automotive Engine Performance Post
Test Review Exam Questions &
Answers (Grade A+)
canister and closed with the purge valve open while the PCM
monitors the fuel tank pressure sensor for vacuum.
Technician A says the computer may activate a circuit by completing
the path to ground. Technician B says the computer may activate a
circuit by completing the path to power. Who is correct? -
correct answer ✅Both A and B.
Technician A states that non-contact type hall-effect sensors wear
out very quickly.
Technician B states that some throttle position sensors are non-
contact. -
correct answer ✅Technician B only.
The purpose of the PCV system is to: -
correct answer ✅Control emissions, relieve the engine's crankcase
of pressure and vapors, and reduce the formation of oil sludge.
Technician A says the crankshaft position sensor can be a Hall-effect
switch.
,Automotive Engine Performance Post
Test Review Exam Questions &
Answers (Grade A+)
Technician B says the crankshaft position sensor can be a magnetic
pulse generator.
Who is correct? -
correct answer ✅Both A and B.
Technician A says both the fuel injector and spark plug are turned
off when a cylinder is deactivated on a variable displacement
engine. Technician B says the spark plug may foul if is allowed to
become too cool during cylinder deactivation. Who is correct? -
correct answer ✅Technician B.
Technician A says that ion-sensing ignition systems are based on the
coil on plug system.
Technician B say that the ion-sensing ignition system uses the spark
plug itself as a sensor. Who is correct? -
correct answer ✅Both A and B.
The acceptable amount of ethanol mixed with conventional
gasoline is: -
correct answer ✅Up to 10%.
, Automotive Engine Performance Post
Test Review Exam Questions &
Answers (Grade A+)
True or False:
Long term fuel trim will change in an attempt to keep short term
fuel trim near 0. -
correct answer ✅True
Short-term fuel trim (STFT) adds or subtracts fuel to correct for: -
correct answer ✅Small or temporary changes and changes in the
O2 sensor signal.
Which of the following is false concerning variable valve timing
engines? -
correct answer ✅They utilize the camshaft (CMP) and crankshaft
(CKP) sensors to determine the amount of advance or retard.
Technician A says Mode 5 contains the tests for non-continuously
monitored systems. Technician B says Mode 6 contains the oxygen
sensor monitoring tests. Who is correct? -
correct answer ✅Neither A or B.
Which of the following is a pre-combustion emission control? -
correct answer ✅EVAP
