Fuel Injector: Description and Operation

Ignition Wiring Diagram:

NOTE: Because different models and engine applications vary in wire colors, circuit numbers, and pin numbers, the above image is a typical example. Refer to COMPUTERS AND CONTROL SYSTEMS/SCHEMATIC AND ROUTING DIAGRAMS for specific schematic applications.

OPERATION:
The fuel injectors are solenoid activated, controlled by the PCM. The PCM turns on the solenoids, which lifts a normally closed ball off a seat. Fuel, under pressure, is injected in a conical spray pattern at the walls of the throttle body bore above the throttle valve.
The fuel that is not used by the injectors passes through the pressure regulator before being returned to the fuel tank.