AUT 135 Final Exam Actual Exam 2026 | Automotive
Technology | Complete Questions and Correct Answers |
Verified Answers | Just Released
Technician A says an 87 octane fuel is a blend of 87 percent octane and 13
percent ethanol. Technician B says an 87 octane fuel will experience
detonation in a test engine at the same temperatures and pressures as a
sample fuel blend of 87 percent isooctane and 13 percent heptane. Who is
correct? - (Correct Answer) -b only
_____ emissions are caused largely by unburned fuel from the combustion
chambers. - (Correct Answer) -HC
Which of the following should NOT be used to lubricate injector O-rings? -
(Correct Answer) -silicone greese
The dwell period on a modern electronic ignition system ______. - (Correct
Answer) -increases [lengthens] as engine RPM increases
When viewing injector patterns on a lab scope, the injector pulse end with a
______. - (Correct Answer) -last upward spike
Technician A says some BEVs use liquid to heat the passenger compartment.
Technician B says some BEVs use an electric resistance heater with a fan to
heat the passenger compartment. Who is correct? - (Correct Answer) -both
Which of the following statements is not true? - (Correct Answer) -A type B
misfire will cause the MIL light to flash
,Trouble codes are being discussed. Technician A says that the first time the
system detects a fault, a pending code is set. Technician B says that a
pending code will turn on the MIL light. Who is correct? - (Correct Answer) -a
only
Crankshaft sensors are being discussed. Technician A says the signal from a
Hall-effect CKP cannot be used to synchronize fuel injector timing with the
engine. Technician B says some early distributor ignition systems relied on
photoelectric sensors to monitor crankshaft position. Who is correct? -
(Correct Answer) -b only
Technician A says the production of CO2 is directly related to the amount of
fuel consumed; therefore, more fuel-efficient engines produce less CO2.
Technician B says imposing new CAFE [fuel economy] standards will, in
effect, reduce CO2 emissions. Who is correct? - (Correct Answer) -both
Compressed hydrogen used in FCEVs [fuel cell electric vehicle] is stored at
approximately ______ psi. - (Correct Answer) -5,000
Technician A says diesel engines can be used in a hybrid powertrain.
Technician B says a gasoline engine is normally used in hybrid powertrain.
Who is correct? - (Correct Answer) -both
A vehicle with a DTC for an engine coolant temperature out of range code is
being tested. The serial data stream shows the coolant temperature to be
198 degrees Fahrenheit. When the technician tests the resistance between
, the ETC terminals, he finds infinite resistance. The specifications call for 20 to
40 ohms at 200 degrees Fahrenheit. After the ECT is replaced and the code is
erased, the system runs normally and the code and MIL illumination do not
reoccur. How is this possible? - (Correct Answer) -When the ECT failed, the
PCM substituted a nominal ECT value that allowed the engine to run in limp
home mode; the substituted value was displayed by the scan tool
Technician A says electronic secondary air systems used on OBD-II vehicles
use an electrically driven air pump. Technician B says the check valves in the
secondary air tubes prevent converter overheating if the electric air pump
fails. Who is correct? - (Correct Answer) -a only
Technician A says increasing the Reid vapor pressure [RVP] will help the
engine start easier in cold weather. Technician B says increasing the RVP will
increase the possibility of fuel boiling [vapor lock] in summer driving. Who is
correct? - (Correct Answer) -both
Technician A says the inertia switch has a reset button that must be
depressed for at least one second before the pump will operate again.
Technician B says the inertia switch is triggered by the ABS control module.
Who is correct? - (Correct Answer) -a only
Diagnostic trouble codes are being discussed. Technician A says a P0442 is a
manufacturer's code and means different things, depending on what
manufacturer built the car. Technician B says that a P0304 code is a universal
code that means the same thing no matter what manufacturer built the car.
Who is correct? - (Correct Answer) -b only
Technology | Complete Questions and Correct Answers |
Verified Answers | Just Released
Technician A says an 87 octane fuel is a blend of 87 percent octane and 13
percent ethanol. Technician B says an 87 octane fuel will experience
detonation in a test engine at the same temperatures and pressures as a
sample fuel blend of 87 percent isooctane and 13 percent heptane. Who is
correct? - (Correct Answer) -b only
_____ emissions are caused largely by unburned fuel from the combustion
chambers. - (Correct Answer) -HC
Which of the following should NOT be used to lubricate injector O-rings? -
(Correct Answer) -silicone greese
The dwell period on a modern electronic ignition system ______. - (Correct
Answer) -increases [lengthens] as engine RPM increases
When viewing injector patterns on a lab scope, the injector pulse end with a
______. - (Correct Answer) -last upward spike
Technician A says some BEVs use liquid to heat the passenger compartment.
Technician B says some BEVs use an electric resistance heater with a fan to
heat the passenger compartment. Who is correct? - (Correct Answer) -both
Which of the following statements is not true? - (Correct Answer) -A type B
misfire will cause the MIL light to flash
,Trouble codes are being discussed. Technician A says that the first time the
system detects a fault, a pending code is set. Technician B says that a
pending code will turn on the MIL light. Who is correct? - (Correct Answer) -a
only
Crankshaft sensors are being discussed. Technician A says the signal from a
Hall-effect CKP cannot be used to synchronize fuel injector timing with the
engine. Technician B says some early distributor ignition systems relied on
photoelectric sensors to monitor crankshaft position. Who is correct? -
(Correct Answer) -b only
Technician A says the production of CO2 is directly related to the amount of
fuel consumed; therefore, more fuel-efficient engines produce less CO2.
Technician B says imposing new CAFE [fuel economy] standards will, in
effect, reduce CO2 emissions. Who is correct? - (Correct Answer) -both
Compressed hydrogen used in FCEVs [fuel cell electric vehicle] is stored at
approximately ______ psi. - (Correct Answer) -5,000
Technician A says diesel engines can be used in a hybrid powertrain.
Technician B says a gasoline engine is normally used in hybrid powertrain.
Who is correct? - (Correct Answer) -both
A vehicle with a DTC for an engine coolant temperature out of range code is
being tested. The serial data stream shows the coolant temperature to be
198 degrees Fahrenheit. When the technician tests the resistance between
, the ETC terminals, he finds infinite resistance. The specifications call for 20 to
40 ohms at 200 degrees Fahrenheit. After the ECT is replaced and the code is
erased, the system runs normally and the code and MIL illumination do not
reoccur. How is this possible? - (Correct Answer) -When the ECT failed, the
PCM substituted a nominal ECT value that allowed the engine to run in limp
home mode; the substituted value was displayed by the scan tool
Technician A says electronic secondary air systems used on OBD-II vehicles
use an electrically driven air pump. Technician B says the check valves in the
secondary air tubes prevent converter overheating if the electric air pump
fails. Who is correct? - (Correct Answer) -a only
Technician A says increasing the Reid vapor pressure [RVP] will help the
engine start easier in cold weather. Technician B says increasing the RVP will
increase the possibility of fuel boiling [vapor lock] in summer driving. Who is
correct? - (Correct Answer) -both
Technician A says the inertia switch has a reset button that must be
depressed for at least one second before the pump will operate again.
Technician B says the inertia switch is triggered by the ABS control module.
Who is correct? - (Correct Answer) -a only
Diagnostic trouble codes are being discussed. Technician A says a P0442 is a
manufacturer's code and means different things, depending on what
manufacturer built the car. Technician B says that a P0304 code is a universal
code that means the same thing no matter what manufacturer built the car.
Who is correct? - (Correct Answer) -b only
