Test Bank for Automotive Electrical and
Engine Performance, 9th Edition
Most drive ability complaints thought to be caused by the manual transmissions are
actually caused by - answers the driver
Magnetic pulse generators are commonly used to send data to the computer about: -
answers 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? - answers Both A and B
When the pressure in the intake manifold increases the fuel pressure regulator on a port
fuel injection system: - answers Increases fuel pressure.
Technician A says a P0300 is considered a generic DTC.
Technician B says a P1300 is considered a manufacturer specific DTC. - answers Both
A and B
The vent valve in an evaporative emissions system may be: - answers 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? - answers 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. - answers
Technician B only.
The purpose of the PCV system is to: - answers 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? - answers 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? -
answers 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? - answers Both A and B.
The acceptable amount of ethanol mixed with conventional gasoline is: - answers Up to
10%.
True or False:
Long term fuel trim will change in an attempt to keep short term fuel trim near 0. -
answers True
Short-term fuel trim (STFT) adds or subtracts fuel to correct for: - answers Small or
temporary changes and changes in the O2 sensor signal.
Which of the following is false concerning variable valve timing engines? - answers
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? - answers Neither A or B.
Which of the following is a pre-combustion emission control? - answers EVAP
If the pressure is increased on a gas in an enclosed container, the temperature of the
gas will: - answers Increase.
Oxides of nitrogen (NOx) are formed when combustion temperatures reach more than: -
answers 2,500 degrees F.
The output voltage of a downstream O2 sensor is fluctuating when the engine is at
operating temperature. Technician A says the catalytic converter is working efficiently.
Technician B says the O2 sensor may need to be replaced. Who is correct? - answers
Neither A and B.
Spark plugs are being discussed: Technician A says iridium spark plugs should not
have the gap checked by the technician. Technician B says platinum spark plugs should
not have the electrode filed. Who is correct? - answers Technician B.
Technician A says a rich air-fuel mixture may be the result of higher-than-normal fuel
pressure. Technician B says higher-than-normal fuel pressure causes a lean air-fuel
ratio. Who is correct? - answers Technician A.
Technician A say canister purging occurs only when conditions are correct.
, technician B says modern purge valves are computer controlled. Who is correct? -
answers Both A and B.
While discussing direct fuel injection (DFI), Technician A says the DFI injector may
require a special tool to remove it from the cylinder head. Technician B says the DFI
high-pressure fuel line from the high-pressure pump to the fuel rail can be reused only
twice before replacement. Who is correct? - answers Technician A.
A V6 engine requires how many spark events (spark plug firings) per crankshaft
revolution? - answers 3.
Excessive CO emissions may be caused by: - answers Rich air-fuel mixtures.
Technician A says a speed density EFI system is one in which the computer calculates
the amount of air entering the engine. Technician B says that to determine the air
entering the engine in a speed-density system, the computer uses the TPS and ECT
signals. Who is correct? - answers Technician A.
Twenty inches of vacuum would be equivalent to how much pressure absolute? -
answers 5 psia.
A waste spark ignition system equipped vehicle has a no-spark condition. Technician A
says the crankshaft position sensor may be defective. Technician B says the ignition
module may be defective. Who is correct? - answers Both A and B.
True or False:
If dwell time is to short, the coil and module can overheat. - answers True
Technician A says a quad driver has four independently controllable outputs. Technician
B says some output driver modules may control up seven independent outputs. Who is
correct? - answers Both A and B.
While discussing primary and secondary ignition circuits, Technician A says that the
primary circuit controls the secondary circuit.
Technician B says that the primary circuit also controls ignition timing in the secondary
circuit. Who is correct? - answers Both A and B.
Variable cam timing is used to allow high overlap at: - answers High RPM.
To help isolate a clogged or dirty injector: - answers Perform an injector balance test.
The signal that alerts the misfire monitor that a misfire may be occurring is provided by
the: - answers The crankshaft position sensor.
All CAN protocol messages contain all of the following information except: - answers the
speed of message
Engine Performance, 9th Edition
Most drive ability complaints thought to be caused by the manual transmissions are
actually caused by - answers the driver
Magnetic pulse generators are commonly used to send data to the computer about: -
answers 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? - answers Both A and B
When the pressure in the intake manifold increases the fuel pressure regulator on a port
fuel injection system: - answers Increases fuel pressure.
Technician A says a P0300 is considered a generic DTC.
Technician B says a P1300 is considered a manufacturer specific DTC. - answers Both
A and B
The vent valve in an evaporative emissions system may be: - answers 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? - answers 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. - answers
Technician B only.
The purpose of the PCV system is to: - answers 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? - answers 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? -
answers 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? - answers Both A and B.
The acceptable amount of ethanol mixed with conventional gasoline is: - answers Up to
10%.
True or False:
Long term fuel trim will change in an attempt to keep short term fuel trim near 0. -
answers True
Short-term fuel trim (STFT) adds or subtracts fuel to correct for: - answers Small or
temporary changes and changes in the O2 sensor signal.
Which of the following is false concerning variable valve timing engines? - answers
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? - answers Neither A or B.
Which of the following is a pre-combustion emission control? - answers EVAP
If the pressure is increased on a gas in an enclosed container, the temperature of the
gas will: - answers Increase.
Oxides of nitrogen (NOx) are formed when combustion temperatures reach more than: -
answers 2,500 degrees F.
The output voltage of a downstream O2 sensor is fluctuating when the engine is at
operating temperature. Technician A says the catalytic converter is working efficiently.
Technician B says the O2 sensor may need to be replaced. Who is correct? - answers
Neither A and B.
Spark plugs are being discussed: Technician A says iridium spark plugs should not
have the gap checked by the technician. Technician B says platinum spark plugs should
not have the electrode filed. Who is correct? - answers Technician B.
Technician A says a rich air-fuel mixture may be the result of higher-than-normal fuel
pressure. Technician B says higher-than-normal fuel pressure causes a lean air-fuel
ratio. Who is correct? - answers Technician A.
Technician A say canister purging occurs only when conditions are correct.
, technician B says modern purge valves are computer controlled. Who is correct? -
answers Both A and B.
While discussing direct fuel injection (DFI), Technician A says the DFI injector may
require a special tool to remove it from the cylinder head. Technician B says the DFI
high-pressure fuel line from the high-pressure pump to the fuel rail can be reused only
twice before replacement. Who is correct? - answers Technician A.
A V6 engine requires how many spark events (spark plug firings) per crankshaft
revolution? - answers 3.
Excessive CO emissions may be caused by: - answers Rich air-fuel mixtures.
Technician A says a speed density EFI system is one in which the computer calculates
the amount of air entering the engine. Technician B says that to determine the air
entering the engine in a speed-density system, the computer uses the TPS and ECT
signals. Who is correct? - answers Technician A.
Twenty inches of vacuum would be equivalent to how much pressure absolute? -
answers 5 psia.
A waste spark ignition system equipped vehicle has a no-spark condition. Technician A
says the crankshaft position sensor may be defective. Technician B says the ignition
module may be defective. Who is correct? - answers Both A and B.
True or False:
If dwell time is to short, the coil and module can overheat. - answers True
Technician A says a quad driver has four independently controllable outputs. Technician
B says some output driver modules may control up seven independent outputs. Who is
correct? - answers Both A and B.
While discussing primary and secondary ignition circuits, Technician A says that the
primary circuit controls the secondary circuit.
Technician B says that the primary circuit also controls ignition timing in the secondary
circuit. Who is correct? - answers Both A and B.
Variable cam timing is used to allow high overlap at: - answers High RPM.
To help isolate a clogged or dirty injector: - answers Perform an injector balance test.
The signal that alerts the misfire monitor that a misfire may be occurring is provided by
the: - answers The crankshaft position sensor.
All CAN protocol messages contain all of the following information except: - answers the
speed of message
