Oxygen Sensor and Fuel Trim Quiz

What is the primary function of the short term fuel trim?

• To control the fuel injector pulse width

• To adjust the barometric pressure

• To keep the mixture near stoichiometric

• To make sure the oxygen sensor is reporting accurately

What does a rich signal from the oxygen sensor indicate?

• Lean condition

• High voltage

• Low voltage

• Normal mixture

What gases does a catalytic converter need for the reduction bed to do its job?

• CO and NOx

• Oxygen and CO

• CO and O2

• NOx and Oxygen

What is the primary focus of the engine computer when the vehicle is cruising down the road?

• Fuel economy

• Power

• Emissions

• Speed control

What is the main factor that drives the injection pulse?

• Barometric pressure

• Fuel pressure

• Injector opening and closing

• Air temperature

What is the purpose of the long term fuel trim?

• To adjust the barometric pressure

• To control the fuel injector pulse width

• To keep the mixture near stoichiometric

• To compensate for long-term changes in the air-fuel ratio

What does a lean signal from the oxygen sensor indicate?

• Rich condition

• High voltage

• Normal mixture

• Low voltage

What is the main gas needed by the catalytic converter for the oxidizing bed to do its job?

• CO

• NOx

• Oxygen

• CO2

What is the purpose of the open loop in the engine computer?

• To adjust the barometric pressure

• To ignore the oxygen sensor

• To control the fuel injector pulse width

• To use the oxygen sensor for fuel control

What is the main factor that determines the injection pulse width?

• Engine displacement

• Altitude

• Injector size

• Fuel type