Dodge Sprinter 2006 Manual page 2150

25 - 6 EXHAUST GAS RECIRCULA TION
Fig. 2 EXHAUST GAS RECIRCULATION
1 - EGR VALVE
2 -CHARGE AIR PRESSURE SENSOR
3 - EXHAUST MANIFOLD
4 - EGR DUCT IN CYLINDER HEAD
5 - INTAKE MANIFOLD
OPERA TION
Th e m a ss of t h e a ir su pplied t o t h e cylin der s per
st r oke is t h e decisive fa ct or for det er m in in g t h e opt i-
m u m qu a n t it y of exh a u st ga s for t h e oper a t in g con -
dit ion . Th is is ca lcu la t ed fr om t h e Ma ss Air F low
sen sor in for m a t ion .
Th e E CM eva lu a t es t h is sign a l a s well a s t h a t
fr om t h e Ch a r ge Air P r essu r e sen sor, a n d ou t pu t s a
P WM sign a l in a ccor da n ce wit h on e of t h e m a ps
st or ed in it . Th e sign a l is sen t t o t h e exh a u st ga s
r ecir cu la t ion va lve. Th e m a p is for m u la t ed t o keep
t h e NOx a s low a s possible. Th e E GR va lve is a ct u -
a t ed by a n elect r ic posit ion in g m ot or a n d h a s a self
clea n in g fu n ct ion . E ver y t im e t h e ign it ion swit ch is
t u r n ed off, t h e va lve r ot a t es t wice t o elim in a t e a n y
ca r bon deposit s.
REMOVAL
NOTE: The EGR and EGR Cooler are serviced as an
assembly.
(1) Discon n ect t h e n ega t ive ba t t er y ca ble.
(2) P a r t a illy dr a in t h e coolin g syst em (Refer t o 7 -
COOLING/E NGINE /COOLANT - STANDARD P RO-
CE DURE ).
(3) Lift u p on t h e ch a r ge a ir h ose r et a in in g clip a t
t h e in t a ke m a n ifold a n d discon n ect h ose wit h sea l
(4) Discon n ect t h e elect r ica l con n ect or a t t h e E GR
posit ion er (F ig. 3).
(5) Discon n ect t h e E GR cooler h ose.
(6) Rem ove t h e E GR fa st en er s a n d E GR wit h
cooler a ssem bly (F ig. 3).
Fig. 3 EGR VALVE
1 - EGR VALVE
2 - INTAKE MANIFOLD
3 - EGR COOLER HOSE
4 - HARNESS CONNECTOR
INSTALLA TION
(1) Clea n a ll ga sket m a t in g su r fa ces.
(2) P osit ion t h e E GR posit ion er t o t h e in t a ke m a n -
ifold wit h a n ew ga sket , in st a ll bolt s a n d t igh t en t o
124 lbs.in (14 N·m ) (F ig. 3).
(3) Con n ect t h e E GR posit ion er elect r ica l con n ec-
t or (F ig. 3).
(4) In spect t h e sea l of t h e ch a r ge a ir in let t u be,
r epla ce a s n ecessa r y (F ig. 3).
(5) Sea t t h e ch a r ge a ir t u be wit h ga sket in t o t h e
in t a ke m a n ifold a n d pu sh down on t h e ch a r ge a ir
t u be r et a in in g clip.
(6) Refill t h e coolin g syst em (Refer t o 7 - COOL-
ING/E NGINE /COOLANT
DURE ).
(7) Con n ect n ega t ive ba t t er y ca ble.
VALV E COOLER
DESCRIPTION
Th e exh a u st ga s r ecir cu la t ion (E GR) cooler is a n
in t egr a t ed pa r t of t h e E GR va lve. Coola n t flows
a r ou n d t h e exh a u st ga sses, coolin g t h em befor e t h ey
a r e r em ixed wit h t h e in com in g a ir a n d r ebu r n ed in
t h e com bu st ion ch a m ber (F ig. 4).
VA
- STANDARD P ROCE -