Kuhlelo lwe-MPI, ama-injection ahlukaniswe ngamaqembu, futhi ama-injection eqenjini elifanayo avuliwe ngesikhathi esifanayo. Isibonelo, ama-injection omshini we-4-cylinder ahlukaniswe ngamaqembu amabili, iqembu ngalinye lama-injection amabili, la maqembu amabili ama-injection ashintshana ngamafutha okufafaza, i-crankshaft ye-injini njalo lapho kuba neqembu lama-injection afafaza amafutha. Lolu hlelo lwama-injection luxhunywe ngokufanayo, i-ECU kuphela eqenjini elifanayo lawo wonke ama-injection athumela isignali efanayo, ama-injection asesikhathini esisodwa sokuvula nokuvala, uhlelo lulula ukwenza lula isifunda se-electronic, kodwa ngenxa yezimo ezihlukene zokuntuleka kwenjini kwezinguquko ezingahleliwe emsebenzini, okuzokhiqiza isenzakalo sokuma kwamafutha negesi kubuningi bokudla.

Isistimu ye-SFI, i-injector ngayinye exhunywe ngokuqondile ku-ECU, ngokulandelanayo, ingenziwa ngokuqondile ngaphambi kokuba kuvulwe i-valve yokufaka i-injector, i-injector ingenziwa phakathi kwenkathi yomjovo emibili ukulungiswa ngokushesha kwengxube ukuze ivumelane nezinguquko ezimweni ezahlukene. . Ngakho-ke, i-SFI iyindlela enembe kakhulu futhi ekahle yesistimu yokujova uphethiloli enamaphuzu amaningi elawulwa nge-elekthronikhi, izinjini eziningi zezimoto zisebenzisa le ndlela.