Exam 24: Engine Performance Systems

OBD-II regulations require all vehicle manufacturers to use the same names and acronyms for all electric and electronic systems related to the engine and emission control systems.

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?

Which of the following is NOT an advantage of an electronic spark control system?

When there is a calibration update available for an OBD-II vehicle, the old EEPROM is removed from its socket in the PCM and a new EEPROM with the updated software is installed in its place.

The three pollutants found in the exhaust gases are hydrocarbons, carbon monoxide, and ____________________ .

All OBD-II vehicles have a minimum of ____________________ oxygen sensors.

Besides the tailpipe, hydrocarbons (HC)can also be emitted from the _______.

What is an OBD-II trip?

Engine vacuum is being discussed. Technician A says that when the engine is operating under light loads, engine vacuum is low. Technician B says that engine vacuum is high when the engine is operated under heavy loads. Who is correct?

Port fuel injection systems have a throttle plate assembly, but fuel never passes by the plate.

All cars built since ____________________ are equipped with an electronic fuel injection system.

EGR monitors are being discussed. Technician A says some EGR system monitors EGR flow by measuring the difference in pressure as the EGR gas flows through an orifice (restriction). Technician B says some EGR monitors measure the temperature of the EGR outlet to determine whether there is gas flowing through the EGR valve. Who is correct?

Air/fuel ratios are being discussed. Technician A says that when the air fuel ratio is higher than 14.7 to 1 the engine produces more power. Technician B says that when the air fuel ratio is lower than 14.7 to 1 the engine uses less fuel. Who is correct?

Ignition spark typically occurs a few degrees _______.

When the cylinders are deactivated on a displacement on demand system, _____.

PCM stands for ____________________.

What is the difference between closed loop and open loop engine operation?

What is a type A misfire?

The MIL light should illuminate when the ignition switch is turned to the run position [engine not running] and go out within a few seconds after the engine is started.

Which of the following is not a PCM output?