Understanding Engine Control Systems

What is the primary function of an engine control module (ECM) in a vehicle?

• To control the air conditioning system

• To manage engine performance and emissions

• To operate the vehicle's audio system

• To control the vehicle's lighting system

Which of the following is a characteristic of a diesel engine compared to a gasoline engine?

• Diesel engines use spark plugs for ignition

• Diesel engines have higher thermal efficiency

• Diesel engines operate at lower compression ratios

• Diesel engines are lighter than gasoline engines

What is the main purpose of a fuel injection system in modern vehicles?

• To increase the vehicle's top speed

• To deliver fuel to the engine in precise amounts

• To reduce the vehicle's weight

• To enhance the vehicle's aerodynamics

Which component is responsible for controlling the air intake in an electronic throttle control system?

• Carburetor

• Throttle body

• Fuel pump

• Exhaust manifold

What does the diagnostic trouble code (DTC) P0300 indicate in a vehicle's ECM?

• Engine overheating

• Random/multiple cylinder misfire detected

• Low fuel pressure

• Faulty oxygen sensor

Which of the following is a common method for tuning engine performance?

• Adjusting tire pressure

• Reprogramming the ECM

• Changing the vehicle's color

• Replacing the windshield wipers

What is the role of a catalytic converter in an emissions control system?

• To increase engine power

• To reduce exhaust emissions

• To improve fuel economy

• To enhance vehicle stability

Which type of engine is typically more fuel-efficient, especially for long-distance travel?

• Two-stroke engine

• Diesel engine

• Rotary engine

• Gasoline engine

In a fuel injection system, what is the function of the fuel injector?

• To mix air and fuel in the carburetor

• To spray fuel into the combustion chamber

• To filter impurities from the fuel

• To store excess fuel

Which of the following equations represents the ideal gas law, often used in engine thermodynamics?