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WorksheetsAT100 Unit 6 Test
Total questions: 25
Worksheet time: 13mins
The primary purpose of onboard engine and drive train computers is to control vehicle fuel economy and vehicle _____.
Tire pressures
Emissions
Fluid levels
Collision avoidance systems
When does the ECM go into closed loop mode?
When the engine is cold.
When the engine is at the optimal operating temperature.
When the engine is at wide-open throttle.
When the engine has not been run for 30 days or more.
As a vehicle operates, the ECM runs many self-diagnostic checks, which are called _____
profiles
oscilloscope patterns
diagnostic trouble codes
Monitors
The ECMs in a modern vehicle communicate through a data _____
shield
transformer
bus
magnetic field
In the piezoelectric ceramic element used in an engine knock sensor, electricity is produced by _____
heat
sunlight
rotation
pressure
When the angle of a throttle valve increases, a throttle position sensor (TPS) provides input data for all of the following actions, except:
the air-fuel mixture to be richened.
a determination of the vehicle’s acceleration rate.
engine timing to advance proportionately.
coolant pump flow to increase.
Modern ignition systems feature all of the following components, except:
ignition module.
ECM-based controls.
distributor.
ignition coil mounted over each engine cylinder.
An ECM-operated motor controls a(n) (a) that opens and closes to allow exhaust gas to enter the vehicle’s intake manifold.
exhaust gas recirculation (EGR) valve
supercharger valve
barometric pressure sensor
knock sensor
The ECM energizes the electric fuel pump relay when .
the engine is stopped
the ignition switch is turned to the on position
the mechanical fuel pump stops operating
What is the maximum voltage that some modern electronic ignition systems can produce?
20,000
50,000
60,000
100,000
What is the primary job of the ignition coil?
Convert low voltage to high voltage.
Convert high voltage to low voltage.
Reduce primary voltage.
Reduce secondary voltage.
Electronic triggering devices can be operated by rotation of any of the following, except:
distributor shaft.
crankshaft.
camshaft.
axles.
Direct ignition systems do not use _____
spark plug wires
ignition coils
an ignition control module
a 12-volt battery
What are the three major parts of a spark plug?
Electrodes, insulator, and shell.
Integrated circuit, relay, and shell.
Insulator, relay, and shell.
Electrodes, diode, and semiconductor
Using a resistor spark plug reduces electromagnetic interference and _____
spark strength
spark brightness
spark plug electrode deterioration
spark plug gap
A six-cylinder engine equipped with a direct ignition system has how many ignition coils?
1
2
3
6
All of the following ignition system components are part of the primary ignition circuit, except:
ignition switch.
spark plugs.
ignition control module.
battery.
What controls electricity flow through the primary ignition circuit?
Ignition switch.
Voltage relay.
Secondary windings.
Distributor.
Computer-controlled electronic fuel injection systems rely on input from all of the following sensors to maintain a stoichiometric air-fuel mixture, except:
oxygen sensors.
coolant temperature sensor.
steering angle sensor.
throttle position sensor.
If a pulse fuel injection system is categorized as a “timed” system, what component operates on a precisely timed cycle?
Fuel injector.
Oxygen sensor.
Throttle valve.
All of the above.
Multiport fuel injectors are mounted on a _____ that also contains the fuel pressure regulator.
fuel rail
coolant passage
camshaft
valve stem
Which of the following devices is not one of the four basic parts of a pulse fuel injection system?
Fuel delivery system.
Electronic sensors.
Catalytic converter.
Air induction system.
All of the following statements about modern gasoline fuel injectors are true, except:
injectors may spray gasoline into the intake manifold or directly into the cylinder.
injectors are operated by solenoids or piezoelectric crystals.
injectors are operated by manifold vacuum.
injectors receive fuel from the fuel pump and pressure regulator.
The interaction of the oxygen sensors, ECM, and fuel injectors to keep the air-fuel ratio close to 14.7:1 is called fuel _____
scavenging
clearance
trim
cycle
Engine temperature sensors measure the temperature of _____ and incoming air.
engine coolant
spark plugs
engine valves
gasoline in the combustion chamber
