Unit 6 Test Review Questions

What is the main reason for having multiple oxygen sensors on a modern vehicle?

• To reduce oil consumption

• To monitor and adjust air-fuel ratio more precisely

• To check battery voltage

• To control tire rotation

Which sensor determines the position of the crankshaft?

• Throttle position sensor

• Knock sensor

• Crankshaft position sensor

• Oxygen sensor

Which system uses an ECM to manage spark timing?

• Manual ignition system

• Vacuum-controlled ignition system

• Electronic ignition system

• Mechanical distributor system

Which part measures intake air temperature?

• Coolant temperature sensor

• Intake air temperature sensor

• Manifold absolute pressure sensor

• Knock sensor

What does a heated oxygen sensor include that a non-heated one does not?

• A fuel injector

• An internal heater element

• A throttle valve

• A spark plug wire

When is an engine in open loop mode?

• During cold start-up

• When fully warmed up

• At high speeds only

• During closed loop monitoring

Which sensor helps the ECM adjust for changes in barometric pressure?

• MAP sensor

• MAF sensor

• EGR valve

• Barometric pressure sensor

Which ignition component is responsible for distributing high voltage to the correct spark plug?

• ECM

• Ignition coil

• Distributor

• Fuel pump relay

What does a knock sensor detect?

• Coolant leaks

• Engine misfire

• Abnormal combustion (detonation)

• Low oil pressure

Which of these is a benefit of a direct ignition system?

• Requires a distributor cap

• Uses a single ignition coil for all cylinders

• Reduces the need for spark plug wires

• Runs on low voltage only