Grand Caravan V6-3.8L VIN L (2007)
Fuel Injector: Description and Operation
Operation
OPERATION
Figure 1 FUEL INJECTOR - TYPICAL
The fuel injectors are 12 volt 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 or two streams. The spraying action atomizes the fuel, adding it to the air entering
the combustion chamber. Fuel injectors are not interchangeable between engines.
Injector operation is controlled by a ground path provided for each injector by the PCM. Injector on-time (pulse-width) is variable, and is determined by
the PCM processing all the data previously discussed to obtain the optimum injector pulse width for each operating condition. The pulse width is
controlled by the duration of the ground path provided.
