Grand Voyager V6-3.3L VIN G Flex Fuel (1999)
FUEL INJECTORS-PCM OUTPUT
The fuel injectors are 12 ohm electrical solenoids. The injector contains a pintle that closes off an orifice at the nozzle end. When electric current
is supplied to the injector, the armature and needle move a short distance against a spring, allowing fuel to flow out the orifice. Because the fuel is
under high pressure, a fine spray is developed in the shape of a hollow cone. The spraying action atomizes the fuel, adding it to the air entering the
combustion chamber. The injectors are positioned in the intake manifold.
Fuel Injector Location-Typical
The injectors are positioned in the intake manifold with the nozzle ends directly above the intake valve port.
The fuel injectors are operated by the PCM. They are energized in a sequential order during all engine operating conditions except start up. The
PCM initially energizes all injectors at the same time. Once PCM determines crankshaft position, it begins energizing the injectors in sequence.
The Automatic Shutdown (ASD) relay supplies battery voltage to the injectors. The PCM provides the ground path for the injectors. By switching
the ground path on and off, the PCM adjusts injector pulse width. Pulse width is the amount of time the injector is energized. The PCM adjusts
injector pulse width based on inputs it receives.
