... ECD -V3 (ROM), and ECD -V3 direct-acting valve. The V4 direct-injection diesel fuel injection system forsmall trucks and SUVs appeared in 1998. The V4 system, which uses an inner cam pumping ... the engine with the ECD -V4 has beenimproved (by atomizing the fuel into finer particles and optimizing the rise rate of the injection pressure), andproviding the injection volume and injection ... the venturi, passesthrough the intake manifold, and enters the cylinders. The venturi consists of a "main valve" and a "sub valve". The main valve opens and closes in unison...