Automotive Engine Performance Post
Test Review Already Passed
Magnetic pulse generators are commonly used to send data to the computer about: ✔✔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? ✔✔Both A and B
When the pressure in the intake manifold increases the fuel pressure regulator on a port fuel
injection system: ✔✔Increases fuel pressure.
Technician A says a P0300 is considered a generic DTC.
Technician B says a P1300 is considered a manufacturer specific DTC. ✔✔Both A and B
The vent valve in an evaporative emissions system may be: ✔✔Opened to allow fresh air
through the charcoal 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? ✔✔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. ✔✔Technician B only.
The purpose of the PCV system is to: ✔✔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.
Technician B says the crankshaft position sensor can be a magnetic pulse generator.
Who is correct? ✔✔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? ✔✔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? ✔✔Both A and B.
The acceptable amount of ethanol mixed with conventional gasoline is: ✔✔Up to 10%.
True or False:
Long term fuel trim will change in an attempt to keep short term fuel trim near 0. ✔✔True
Short-term fuel trim (STFT) adds or subtracts fuel to correct for: ✔✔Small or temporary changes
and changes in the O2 sensor signal.
Which of the following is false concerning variable valve timing engines? ✔✔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?
✔✔Neither A or B.
Which of the following is a pre-combustion emission control? ✔✔EVAP
Test Review Already Passed
Magnetic pulse generators are commonly used to send data to the computer about: ✔✔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? ✔✔Both A and B
When the pressure in the intake manifold increases the fuel pressure regulator on a port fuel
injection system: ✔✔Increases fuel pressure.
Technician A says a P0300 is considered a generic DTC.
Technician B says a P1300 is considered a manufacturer specific DTC. ✔✔Both A and B
The vent valve in an evaporative emissions system may be: ✔✔Opened to allow fresh air
through the charcoal 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? ✔✔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. ✔✔Technician B only.
The purpose of the PCV system is to: ✔✔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.
Technician B says the crankshaft position sensor can be a magnetic pulse generator.
Who is correct? ✔✔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? ✔✔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? ✔✔Both A and B.
The acceptable amount of ethanol mixed with conventional gasoline is: ✔✔Up to 10%.
True or False:
Long term fuel trim will change in an attempt to keep short term fuel trim near 0. ✔✔True
Short-term fuel trim (STFT) adds or subtracts fuel to correct for: ✔✔Small or temporary changes
and changes in the O2 sensor signal.
Which of the following is false concerning variable valve timing engines? ✔✔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?
✔✔Neither A or B.
Which of the following is a pre-combustion emission control? ✔✔EVAP
