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, 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.

Fig 1: Identifying SFI Fuel Injector (Typical)

Courtesy of SUZUKI OF AMERICA CORP.

Fuel injector triggering and timing is determined by ECM based upon ignition signals from Camshaft Position (CMP) sensor. Since ECM interprets CMP sensor signal as an indication of spark presence, fuel injector triggering will cease if CMP sensor signal is lost.