Exam 24: Engine Performance Systems

After ____________________ warm-up cycles without a fault, a DTC code is erased from active memory, but the DTC and the freeze frame data will be stored as a history code with freeze frame data until it is cleared.

A catalytic converter monitor DTC is set after detecting faults on ____________________ consecutive drive cycles.

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

The ____________________ sensor is used by the misfire monitor to detect excessive misfires.

What is the relationship between engine load and manifold vacuum?

The first decision the computer makes in determining the best operating strategy is to determine the _____.

The monitor that continuously looks at all the major engine sensors and actuators that can affect emissions levels is called the ____________________.

The output of the upstream and downstream oxygen sensors is compared to determine the efficiency of the ____________________.

During the EVAP monitor vacuum pull-down test, the canister vent solenoid is held open.

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.

What sensor is used to detect engine misfire?

A ____________________ is a snapshot of the activity of the various inputs and outputs at the time the PCM illuminated the MIL.

The ideal or stoichiometric ratio of air to fuel (by weight) is ____________________ in a gasoline engine.

Ignition spark typically occurs a few degrees _______.

The PCM can turn off the A/C compressor when the engine is operating at full throttle.

Besides the tailpipe, hydrocarbons [HC] can also be emitted from the ____________________.

Data collected by system sensors is stored in _____ memory.

Which of the following sensors is NOT used by the computerized ignition system to control ignition timing?

What is short-term fuel trim?

Which of the following statements is not true?