AUT 135 Final Exam Newest Exam | All Questions
and Correct Answers | Verified Answers | Graded
A+ | Newest Exam 2026
A technician connects a DMM with a MIN/MAX/AVG function to the output of an
oxygen sensor. The engine is run at 2000 RPM for several minutes. During the
test, the voltage toggles rapidly between 150 and 900 millivolts. At the end of the
test, the MAX voltage was .967 V, the MIN voltage was .087 V, and the AVG
voltage was .683 V. Technician A says the sensor is faulty and should be replaced.
Technician B says there could be a vacuum leak that caused the sensor voltage to
have a higher than normal average. Who is correct? ---------CORRECT ANSWER-----
------------neither
Technician A says the biggest disadvantage of using CNG as a fuel is that the large
amount space occupied by fuel cylinders limits the driving range of the vehicle.
Technician B says bi-fuel vehicles are equipped to store both CNG and gasoline
and will run on either. Who is correct? ---------CORRECT ANSWER-----------------both
Each fuel injector has a _____-wire connector. ---------CORRECT ANSWER-------------
----two
If a flex fuel vehicle has half a tank of E85 onboard and the driver then fills the
tank up with regular gasoline what will happen? ---------CORRECT ANSWER----------
-------The system will automatically adjust and run normally
,Technician A says the bearings in a turbocharger are cooled by engine oil.
Technician B says turbocharger bearings are cooled by engine coolant. Who is
correct? ---------CORRECT ANSWER-----------------both
Injector cleaning is being discussed. Technician A uses a wire brush to clean the
tips of the injectors. Technician B soaks the injector in cleaning solvent. Who is
correct? ---------CORRECT ANSWER-----------------neither
Technician A says white or grayish powdery deposits on secondary cables at the
point where they cross or near metal parts indicate that the cables' insulation is
faulty. Technician B says if the spark plug wire for #2 cylinder is damaged and the
other wires look good, replace only the damaged wire. Who is correct? ---------
CORRECT ANSWER-----------------a only
Which of the following should be checked before proceeding with specific fuel
injection and electronic control testing? ---------CORRECT ANSWER-----------------all
correct
Using gasoline with high levels of sulfur can cause ______. ---------CORRECT
ANSWER-----------------all correct
, Technician A says in a returnless fuel system, the pressure regulator is mounted
on the fuel rail. Technician B says in a returnless fuel system the pressure
regulator, fuel sender, and pump assembly are combined in one unit inside the
fuel tank. Who is correct? ---------CORRECT ANSWER-----------------b only
Data collected by system sensors is stored in _____ memory. ---------CORRECT
ANSWER-----------------RAM
While discussing hydrogen: Technician A says that a hydrogen atom has one
proton and two electrons. Technician B says that hydrogen is produced in a fuel
cell when water is broken down into its basic elements. Who is correct? ---------
CORRECT ANSWER-----------------a only
A vehicle is being diagnosed with a low fuel pressure problem. A fuel pump
current test reveals higher than normal current flow. Technician A says the vehicle
may have a clogged fuel filter. Technician B says the fuel pump ground wire may
be loose or corroded. Who is correct? ---------CORRECT ANSWER-----------------a
only
A/F ratio sensors are being discussed. Technician A says the output voltage of
these sensors is much higher than a conventional O2S [oxygen sensor]. Technician
B say when the output of an A/F ratio sensor is looked at with an OBD-II generic
scan tool, the voltage range will appear the same as a conventional O2S sensor, 0
to 1 volt. Who is correct? ---------CORRECT ANSWER-----------------both
and Correct Answers | Verified Answers | Graded
A+ | Newest Exam 2026
A technician connects a DMM with a MIN/MAX/AVG function to the output of an
oxygen sensor. The engine is run at 2000 RPM for several minutes. During the
test, the voltage toggles rapidly between 150 and 900 millivolts. At the end of the
test, the MAX voltage was .967 V, the MIN voltage was .087 V, and the AVG
voltage was .683 V. Technician A says the sensor is faulty and should be replaced.
Technician B says there could be a vacuum leak that caused the sensor voltage to
have a higher than normal average. Who is correct? ---------CORRECT ANSWER-----
------------neither
Technician A says the biggest disadvantage of using CNG as a fuel is that the large
amount space occupied by fuel cylinders limits the driving range of the vehicle.
Technician B says bi-fuel vehicles are equipped to store both CNG and gasoline
and will run on either. Who is correct? ---------CORRECT ANSWER-----------------both
Each fuel injector has a _____-wire connector. ---------CORRECT ANSWER-------------
----two
If a flex fuel vehicle has half a tank of E85 onboard and the driver then fills the
tank up with regular gasoline what will happen? ---------CORRECT ANSWER----------
-------The system will automatically adjust and run normally
,Technician A says the bearings in a turbocharger are cooled by engine oil.
Technician B says turbocharger bearings are cooled by engine coolant. Who is
correct? ---------CORRECT ANSWER-----------------both
Injector cleaning is being discussed. Technician A uses a wire brush to clean the
tips of the injectors. Technician B soaks the injector in cleaning solvent. Who is
correct? ---------CORRECT ANSWER-----------------neither
Technician A says white or grayish powdery deposits on secondary cables at the
point where they cross or near metal parts indicate that the cables' insulation is
faulty. Technician B says if the spark plug wire for #2 cylinder is damaged and the
other wires look good, replace only the damaged wire. Who is correct? ---------
CORRECT ANSWER-----------------a only
Which of the following should be checked before proceeding with specific fuel
injection and electronic control testing? ---------CORRECT ANSWER-----------------all
correct
Using gasoline with high levels of sulfur can cause ______. ---------CORRECT
ANSWER-----------------all correct
, Technician A says in a returnless fuel system, the pressure regulator is mounted
on the fuel rail. Technician B says in a returnless fuel system the pressure
regulator, fuel sender, and pump assembly are combined in one unit inside the
fuel tank. Who is correct? ---------CORRECT ANSWER-----------------b only
Data collected by system sensors is stored in _____ memory. ---------CORRECT
ANSWER-----------------RAM
While discussing hydrogen: Technician A says that a hydrogen atom has one
proton and two electrons. Technician B says that hydrogen is produced in a fuel
cell when water is broken down into its basic elements. Who is correct? ---------
CORRECT ANSWER-----------------a only
A vehicle is being diagnosed with a low fuel pressure problem. A fuel pump
current test reveals higher than normal current flow. Technician A says the vehicle
may have a clogged fuel filter. Technician B says the fuel pump ground wire may
be loose or corroded. Who is correct? ---------CORRECT ANSWER-----------------a
only
A/F ratio sensors are being discussed. Technician A says the output voltage of
these sensors is much higher than a conventional O2S [oxygen sensor]. Technician
B say when the output of an A/F ratio sensor is looked at with an OBD-II generic
scan tool, the voltage range will appear the same as a conventional O2S sensor, 0
to 1 volt. Who is correct? ---------CORRECT ANSWER-----------------both
