Fuel Injector(s)
Swift uses Sequential Multiport Fuel Injection (SFI), which incorporates 4 fuel injectors mounted in a fuel rail assembly. MFI system injects fuel into each cylinder head intake port.
When solenoid coil of fuel injector is energized by PCM, coil becomes an electromagnet. See Fig 1 -2. This lifts injector plunger, allowing fuel under pressure to be injected into intake manifold. Since fuel pressure is relatively constant, air/fuel mixtures are controlled by injector pulse width ("on" time). PCM determines proper pulse width based upon input signals received from various sensors and switches.
Fuel injector triggering and timing is determined by PCM based upon ignition signals from Camshaft Position (CMP) sensor. Since PCM interprets CMP sensor signal as an indication of spark presence, fuel injector triggering will cease if CMP sensor signal is lost.