Fuel Injector(s)
All models use Sequential Multiport Fuel Injection (SFI), which incorporates fuel injectors mounted in a fuel rail assembly. When solenoid coil of fuel injector is energized by ECM/PCM, 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/PCM determines proper pulse width based upon input signals received from various sensors and switches.
Fuel injector triggering and timing is determined by ECM/PCM based upon ignition signals from Camshaft Position (CMP) sensor. Since ECM/PCM interprets CMP sensor signal as an indication of spark presence, fuel injector triggering will cease if CMP sensor signal is lost.