Automotive Engine Performance Post Test Review with complete verified solutions 2024.
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Course
Postal Automotive
Institution
Postal Automotive
Most drive ability complaints thought to be caused by the manual transmissions are actually caused by
the driver
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 me...
Automotive Engine
Performance Post Test
Review with complete
verified solutions 2024
Games and activities
Most drive ability complaints thought to be caused
by the manual transmissions are actually caused
by - answer the driver
Magnetic pulse generators are commonly used to
send data to the computer about: - 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? - answer Both A and B
When the pressure in the intake manifold increases
the fuel pressure regulator on a port fuel injection
system: - 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. - answer Both A and B
The vent valve in an evaporative emissions system
may be: - answer 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? - 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. - answer Technician B
only.
The purpose of the PCV system is to: - 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.
Technician B says the crankshaft position sensor
can be a magnetic pulse generator.
Who is 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? - 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? - answer Both A and B.
The acceptable amount of ethanol mixed with
conventional gasoline is: - answer Up to 10%.
True or False:
Long term fuel trim will change in an attempt to
keep short term fuel trim near 0. - answer True
, Short-term fuel trim (STFT) adds or subtracts fuel
to correct for: - answer Small or temporary
changes and changes in the O2 sensor signal.
Which of the following is false concerning variable
valve timing engines? - 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? - answer Neither
A or B.
Which of the following is a pre-combustion
emission control? - answer EVAP
If the pressure is increased on a gas in an enclosed
container, the temperature of the gas will: - answer
Increase.
Oxides of nitrogen (NOx) are formed when
combustion temperatures reach more than: -
answer 2,500 degrees F.
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