Exam 30: Electronic Fuel Injection

In ____________________ systems, the injectors are grouped together in pairs or groups, and these pairs or groups of injectors are turned on at the same time.

The strength of the mass airflow (MAF) signal is determined by the energy needed to keep the heated sensing element at a constant temperature above the incoming ambient air temperature.

Only _____ meets the requirements of OBD II regulations.

In closed loop, the PCM adjusts the pulse width according to inputs from a variety of sensors, but primarily the _____.

Describe the purpose of an ECT signal on an EFI system.

A CPI [central multiport injection] fuel injection system for a six-cylinder engine has ______.

Bottom-feed injectors used in throttle body injection [TBI] systems are able to use fuel pressures as low as 10 psi.

PFI systems use at least one injector at each cylinder.

Technician A says the computer uses the TP sensor and ECT sensor signals to determine the amount of air entering the engine in a speed-density system. Technician B says the computer uses the TP sensor and oxygen sensor signals to determine the amount of air entering the engine in a speed-density system. Who is correct?

Technician A says a throttle body may house one fuel injector. Technician B says a throttle body may house two fuel injectors. Who is correct?

All throttle body assemblies should be cleaned whenever the air filter is changed.

IAC [idle air control] valves are operated by a ______.

CPI [central multiport injection] injectors are located in the lower half of the intake manifold.

Which of the following is NOT representative of sequential fuel injection systems?

Which of the following is NOT an operating mode of a GDI [gasoline direct injection] engine?

The ____________________ in a TBI system is designed to provide a constant pressure on the fuel injector throughout the range of engine loads and speeds.

The longest injector pulse width occurs during ______.

The most important sensor in the fuel management system is _____.

Fuel injectors are electromechanical devices.

The ____________________ receives signals from all the system sensors, processes them, and transmits programmed electrical pulses to the fuel injectors.