DensoECD-V5[必威体育精装版].docVIP

ECD-V5 Injection Pump System NOTE: Some of the components of the ECD-V5 injection pump system are very similar in design and operation to those of the NP-VE4 injection pump system. Therefore this lesson only describes the components which are new or operate in a different way to those in the NP-VE4 injection pump system. Intake system The construction and operation of the intake system is essentially carried over from that of the NP-VE4 injection pump system except for the following: Mass air flow sensor has been eliminated (only Euro 2 vehicles) Turbocharger with variable geometry turbine has been adopted (only Euro 3 vehicles) Variable swirl control valve has been adopted (only Euro 3 vehicles) Parts location 1 Fresh-air duct 7 VBC vacuum actuator 2 Resonance chamber 8 VBC check valve 3 Air cleaner 9 VBC solenoid valve 4 Turbocharger 10 VBC vacuum chamber 5 Charge air cooler 11 VSC vacuum actuator 6 Intake manifold 12 VSC solenoid valve Intake system (continued) System overview 1 Fresh-air duct 8 VBC solenoid valve 2 Air cleaner 9 VBC check valve 3 Turbocharger 10 VSC vacuum actuator 4 Charge air cooler 11 VSC solenoid valve 5 Intake manifold 12 Vacuum pump 6 VBC vacuum actuator 13 To PCM 7 VBC vacuum chamber 14 Vacuum chamber Turbocharger Mazda vehicles with RF-T engine and Euro 3 emission standard feature a turbocharger with VGT (Variable Geometry Turbine), which controls the boost pressure by adjusting guide blades. The blades are located in the turbine housing and are driven by a vacuum actuator, resulting in an increased power output and a reduced fuel consumption. The guide blades vary the cross-section in front of the turbine and thus the passages that duct the exhaust gas to the turbine. The position of the guide blades is controlled by the PCM, which activates the VBC (Variable Boost Control) solenoid valve via a duty signal. As a result, the boost pressure remains approximately the same over the entire engine speed range. 1 Adjusting linkage 4 Guide