Egr Valve - Detroit Diesel Series 60 EGR Technician Manual

DDEC IV COMPONENTS

EGR Valve

EGR valve position is controlled by the ECM. The ECM continuously monitors all engine
operation modes and performs self diagnostic checks of RPM, load, altitude, air temperature, etc.
and uses this information to determine the EGR valve position. The ECM changes EGR valve
position by regulating air pressure output from the VPOD to an actuator mounted to EGR valve.
The EGR valve outlet is connected to the EGR cooler and recirculates a fraction of the engine
exhaust gases to the intake manifold for purposes of engine emission control. When the EGR
valve is closed, exhaust flows from the exhaust manifold, past the turbine wheel into the VNT
and out exhaust system in traditional way. See Figure 2-11 to view a pre-2004 EGR valve and
see Figure 2-12 to view enhanced EGR valve.
NOTE:
The EGR actuator is spring loaded. If air pressure is lost the actuator will close the EGR
valve resulting in no EGR flow.
Figure 2-11 Pre-2004 EGR Valve
2-12
All information subject to change without notice. (Rev. June 2005)
7SE60 0506 Copyright © 2005 DETROIT DIESEL CORPORATION