Deceleration Mode - Dodge Sprinter 2006 Manual

14 - 8 FUEL DELIVERY
Switching Off Main Injection
Ma in in ject ion is swit ch ed off wh en :
• E n gin e speed is t oo h igh >4700 - 4800 r pm
• Ma in in ject ion qu a n t it y t oo low
• Low fu el pr essu r e in fu el r a il
• E n gin e off
• E xt er n a l qu a n t it y con t r ol
• Deceler a t ion m ode
Calculating Main Injection
Th e qu a n t it y of m a in in ject ion is ca lcu la t ed by:
• E n gin e speed
• At m osph er ic pr essu r e
• Coola n t t em per a t u r e
• Boost a ir t em per a t u r e
• F u el r a il pr essu r e
• Boost pr essu r e
Period of Actuation
F or ca lcu la t in g t h e per iod of a ct u a t ion of t h e m a in
in ject ion it is n ecessa r y t o kn ow wh et h er a pr e-in jec-
t ion h a s occu r r ed or n ot .
Th e coola n t t em per a t u r e, ch a r ge a ir t em per a t u r e
a n d t h e a t m osph er ic pr essu r e a r e u sed for cor r ect in g
t h e m a in in ject ion qu a n t it y. If m a in in ject ion qu a n -
t it y is less t h a n a m in im u m qu a n t it y wh ich is depen -
den t on fu el r a il pr essu r e, n o pr ein ject ion t a kes
pla ce. In t h is ca se, on ly m a in in ject ion is per for m ed.
If t h e qu a n t it y is t h en st ill below t h e m in im u m
qu a n t it y, n eit h er m a in in ject ion or pr e-in ject ion t a kes
pla ce (deceler a t ion m ode).

Deceleration Mode

Th e pu r pose of t h e deceler a t ion m ode is t o in t er-
r u pt t h e oper a t ion of t h e in ject or s. Th e E CM det er-
m in es t h e a cceler a t or peda l posit ion fr om a su pplied
sign a l a n d it det er m in es t h e en gin e speed by t h e
cr a n k sen sor. In t h e over r u n a n d wit h t h e en gin e
speed a bove 1600, wit h t h e a cceler a t or peda l n o
pr essed, t h e in ject or s a r e n o lon ger a ct u a t ed a n d t h e
fu el r a il pr essu r e is lower ed by t h e pr essu r e r egu la -
t or va lve.
Full Load Injected Quantity
Th e pu r pose of t h e fu ll loa d in ject ed qu a n t it y is t o
m in im ize t h e for m a t ion of sm oke. Th e E CM lim it s
t h e fu el r a il pr essu r e wh en t h e en gin e is oper a t in g a t
fu ll loa d by wa y of t h e qu a n t it y con t r ol va lve, a n d
qu a n t it y of fu el in ject ed by t h e in ject or s. t h is m in i-
m izes t h e for m a t ion of sm oke wh en a cceler a t in g a n d
dr ivin g a t con st a n t speeds. If a fa u lt occu r s a t t h e
boost pr essu r e con t r ol, fu ll loa d in ject ed qu a n t it y is
r edu ced.
Limiting Maximum Engine Speed
Th e E CM det er m in es t h e en gin e speed ba sed on
t h e sign a l su pplied by t h e cr a n ksh a ft sen sor a n d lim -
it s t h is by in t er r u pt in g t h e oper a t ion of t h e fu el
in ject or s.
Fuel Quantity Control
Th e fu el qu a n t it y is con t r olled sepa r a t ely for ea ch
cylin der by t h e E CM in lin e wit h t h e fir in g or der.Th e
E CM det ect s t h e oper a t in g st a t e wh ich exist s a t t h e
en gin e by m ea n s of t h e sen sor s. In or der a da pt t h e
qu a n t it y in ject ed, eit h er t h e fu el r a il pr essu r e ca n be
a dju st ed by t h e fu el solen oid a n d qu a n t it y con t r ol
va lve or t h e a ct u a t ion t im e of t h e solen oid va lves in
t h e in ject or s
Boiling Protection
In or der t o pr ot ect a ga in st t h er m a l over loa d a n d
a lon g wit h cr it er ia pr ogr a m m ed in t h e E CM, t h e
in ject ion qu a n t it y is r edu ced a s a fu n ct ion of t h e cool-
a n t t em per a t u r e a n d veh icle speed. If t h e coola n t
t em per a t u r e sen sor fa ils t h e oil t em per a t u r e sign a l
fr om t h e oil sen sor is u sed a s a su it a ble va lu e.
Fuel Tank Protection
Th e fu el r a il pr essu r e is lower ed in or der t o pr ot ect
t h e fu el t a n k fr om over h ea t in g. Th e fu el t em per a t u r e
sen sor m ea su r es t h e t em per a t u r e of t h e fu el bein g
su pplied fr om t h e t a n k, in t h e h igh pr essu r e fla n ge.
If t h e fu el is t oo wa r m t h e fu el r a il pr essu r e is fu r-
t h er r edu ced by t h e qu a n t it y con t r ol va lve.
STAN DARD PROCEDU RE
STANDARD PROCEDURE - DRAINING FUEL
TANK - DIESEL
(1) P osit ion a dr a in h ose in t o t h e fu el fill open in g.
(2) Dr a in fu el t a n k u sin g a n a ppr oved diesel fu el
dr a in in g st a t ion .
FUEL CONTAMINA TION
If a diesel en gin e's fu el su pply h a s been con t a m i-
n a t ed wit h ga solin e, t h e followin g pr ocedu r e m u st be
followed:
(1) Rem ove a ll fu el fr om t h e fu el t a n k. (Refer t o 14
- F UE L SYSTE M/F UE L DE LIVE RY - STANDARD
P ROCE DURE -DRAINING F UE L TANK) Use a n
a ppr opr ia t e fu el con t a in er. Dispose of t h e con t a m i-
n a t ed fu el u sin g t h e pr oper pr ocedu r es.
CAUTION: Dispose of petroleum based products in
a manner consistent with all applicable Local, State,
Federal, and Provincial regulations.
(2) Rem ove a n d clea n fu el t a n k. (Refer t o 14 -
F UE L SYSTE M/F UE L DE LIVE RY/F UE L TANK -
RE MOVAL)
(3) In st a ll t h e fu el t a n k. (Refer t o 14 - F UE L SYS-
TE M/F UE L DE LIVE RY/F UE L TANK - INSTALLA-
TION)
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