Ivalvu yomkhawulo wesitimela esinengcindezi ephezulu ekhiqizwa yi-YS ihlanganisa uhlobo lwe-Bosch kanye nohlobo lweDenso. I-valve yokunciphisa ingcindezi ye-YS ilawula futhi ilawula umfutho kawoyela wephaseji eliyinhloko likawoyela. Ukuze kuqinisekiswe ukusebenza okuvamile kwenjini, ukucindezela kwamafutha ephaseji eliyinhloko lamafutha kufanele kube ngokufanele. Ngalesi sikhathi, i-valve yokunciphisa ingcindezi izovuleka ngokuzenzakalelayo, futhi uwoyela uzobuyiselwa ngepompo likawoyela, elingakwazi ukulawula Ukucindezela kwamafutha ephaseji likawoyela eliyinhloko.