RAM 1500 Truck 2WD V6-3.9L VIN X (1999)
The nozzle ends of the injectors are positioned into openings in the intake manifold just above the intake valve ports of the cylinder head. The
engine wiring harness connector for each fuel injector is equipped with an attached numerical tag (INJ 1, INJ 2 etc.). This is used to identify each
fuel injector with its respective cylinder number.
he injectors are energized individually in a sequential order by the powertrain control module (PCM). The PCM will adjust injector pulse width by
switching the ground path to each individual injector on and off. Injector pulse width is the period of time that the injector is energized. The PCM
will adjust injector pulse width based on various inputs it receives.
During start up, battery voltage is supplied to the injectors through the ASD relay. When the engine is operating, voltage is supplied by the
charging system. The PCM determines injector pulse width based on various inputs.
