Join Date: Jan 2015
Location: twin cities MN
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Some notes swiped from a 2007 Ducato refresher course found info on the EGR system...
(© 2006 Fiat Auto S.p.A. - All rights reserved)
EGR system: This system recirculates part of the exhaust gases to the intake under certain particular operating conditions. This lowers peak temperature in the combustion chamber so as to reduce nitrogen oxide (NOx) formation. The engine control unit recirculates a portion of the exhaust gases taken from the exhaust manifold back to the engine intake.
To this end, the engine control unit processes the inputs from:
- atmospheric pressure sensor,
- water pressure sensor,
- engine rpm sensor,
- accelerator pedal potentiometer
and pilots both the vacuum control solenoid valve and the throttle valve via a PWM signal according to the mapping stored in its memory.
<blah blah blah>
The E.G.R. valve is mounted at the end of the heat exchanger.
The valve is cooled by the engine coolant coming out of the heat exchanger to ensure improved efficiency and long life.
The amount of recirculated exhaust gas is determined by a poppet valve operated by the vacuum let in by a calibrated connector; vacuum is taken from the pipe connecting vacuum pump to servo brake.
Pretty good source, copy'n paste a sentence or two from above and google it to find it online : ) The EGR stuff starts at p30...
2014 Diesel 2500 window wagon
11 June 2015 delivery