Automotive Engine Performance Post Test Review Already Passed
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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 ...
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
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