COMPONENTS
FUNCTIONALITY OF THE EGR COMPONENTS
Variable Pressure Output Device (VPOD)
12 V/24V power supply system
DDEC IV ECM: PWM2 (Y1) EGR and PWM4 (X2) VNT
Figure 2-4
EGR Valve and VNT Control System
There are two Variable Pressure Output Devices (VPOD) that control the Variable Geometry
Turbo (VNT) and the EGR system. The location of the VPODs is application dependent. During
engine EGR operation, the VPOD provides modulated air pressure to the pneumatic actuators
which change the VNT vanes and EGR valve positions. The VPOD interface with other systems
may be viewed in see Figure 2-4.
2-4
All information subject to change without notice.
(Rev. April 2004)
7SE60 0404
Copyright © 2004 DETROIT DIESEL CORPORATION