Fuel Injector(s)
Swift DOHC use Multiport Fuel Injection (MFI), which incorporates 4 fuel injectors mounted in a fuel rail assembly. MFI system injects fuel into each cylinder head intake port.
When the solenoid coil of injector is energized by ECM, coil becomes an electromagnet. See Fig 1 . This lifts injector plunger, allowing fuel under pressure to be injected into cylinder head. Since fuel pressure is relatively constant, air/fuel mixtures are controlled by injector pulse width ("on" time). ECM determines proper pulse width based upon input signals received from various sensors and switches.