Dodge Sprinter 2006 Manual page 2161

1 .0 I N T RODU CT I ON
Th e pr ocedu r es con t a in ed in t h is m a n u a l in clu de
a ll of t h e specifica t ion s, in st r u ct ion s, a n d gr a ph ics
n eeded t o dia gn ose NAG1 E lect r on ic Au t om a t ic
Tr a n sm ission a n d Sh ift Lever Assem bly pr oblem s.
Th e dia gn ost ics in t h is m a n u a l a r e ba sed on t h e
fa ilu r e con dit ion or sym pt om bein g pr esen t a t t h e
t im e of dia gn osis.
Wh en r epa ir s a r e r equ ir ed, r efer t o t h e a ppr opr i-
a t e volu m e of t h e ser vice in for m a t ion for t h e pr oper
r em ova l a n d r epa ir pr ocedu r e.
READ THIS MAN U AL B EF ORE TRYIN G TO
D IAGN OS E A VEHICLE TROU B LE COD E.
Dia gn ost ic pr ocedu r es ch a n ge ever y yea r. New
dia gn ost ic syst em s m a y be a dded a n d/or ca r r yover
syst em s m a y be en h a n ced. It is r ecom m en ded t h a t
you r eview t h e en t ir e m a n u a l t o becom e fa m ilia r
wit h a ll n ew a n d ch a n ged dia gn ost ic pr ocedu r es.
1.1 SYSTEM COVERAGE
Th is dia gn ost ic pr ocedu r es m a n u a l cover s a ll
Spr in t er (VA) equ ipped wit h a NAG1 Au t om a t ic
Tr a n sm ission .
1.2 SIX -STEP TROUBLESHOOTING
PROCEDURE
Dia gn osis of t h e NAG1 elect r on ic t r a n sm ission is
don e in six ba sic st eps:
Ver ifica t ion of com pla in t
Ver ifica t ion of a n y r ela t ed sym pt om s
Sym pt om a n a lysis
P r oblem isola t ion
Repa ir of isola t ed pr oblem
Ver ifica t ion of pr oper oper a t ion
2 .0 I DEN T I FI CAT I ON OF
SY ST EM
Th e NAG1 Tr a n sm ission fa m ily ca n be iden t ified
by t h e pr esen ce of a 13 pin elect r ica l con n ect or, wit h
a ba yon et lock on t h e r igh t h a n d side of t h e t r a n s-
m ission . Th e con n ect or is or ien t ed h or izon t a lly.
3 .0 SY ST EM DESCRI PT I ON AN D
FU N CT I ON AL OPERAT I ON
3.1 GENERAL DESCRIPTION
Th e NAG1 elect r on ic t r a n sm ission is a n elect r on -
ica lly con t r olled five speed t r a n sm ission wit h a
con t r olled slip t or qu e con ver t er. Th e NAG1 elec-
GEN ERAL I N FORM AT I ON
t r on ic t r a n sm ission is a con ven t ion a l t r a n sm ission
in t h a t it u ses h ydr a u lica lly a pplied clu t ch es t o sh ift
a pla n et a r y gea r t r a in . H owever, t h e elect r on ic
con t r ol syst em r epla ces m a n y of t h e m ech a n ica l a n d
h ydr a u lic com pon en t s u sed in con ven t ion a l t r a n s-
m ission va lve bodies.
Th e r a t ios for t h e gea r st a ges a r e obt a in ed by 3
pla n et a r y gea r set s. F ift h Gea r is design ed a s a n
Over dr ive wit h a h igh speed r a t io. Th e gea r s a r e
a ct u a t ed elect r on ica lly/h ydr a u lica lly. Th e elect r on ic
con t r ol syst em en a bles pr ecise a da pt a t ion of pr es-
su r es t o t h e r espect ive oper a t in g con dit ion s a n d t o
t h e en gin e ou t pu t du r in g a sh ift ph a se, wh ich
r esu lt s in a sign ifica n t im pr ovem en t in sh ift qu a l-
it y.
3.2 FUNCTIONAL OPERA TION
Th e NAG1 elect r on ic t r a n sm ission h a s a fu lly
a da pt ive con t r ol syst em . Th e syst em per for m s it s
fu n ct ion s ba sed on con t in u ou s r ea l-t im e sen sor a n d
swit ch feedba ck in for m a t ion . In a ddit ion t h e TCM
r eceives in for m a t ion fr om t h e Sh ift Lever Assem bly,
E CM (en gin e m a n a gem en t ) a n d ABS (ch a ssis sys-
t em s) con t r oller s over t h e CAN bu s. Th e CAN bu s is
a h igh speed com m u n ica t ion bu s t h a t a llows r ea l
t im e con t r ol ca pa bilit y bet ween va r iou s con t r oller s.
Most m essa ges a r e sen t ever y 20 m illisecon ds, t h is
m ea n s cr it ica l in for m a t ion ca n be sh a r ed bet ween
t h e Tr a n sm ission , Sh ift er, E n gin e a n d ABS con t r ol-
ler s. Th e CAN bu s is a t wo wir e bu s wit h a CAN C
B u s (+) c irc u it a n d a CAN C B u s (-) c irc u it. Th e
CAN bu s u ses a t wist ed pa ir of wir es in t h e h a r n ess
t o r edu ce t h e pot en t ia l of r a dio a n d n oise in t er fer-
en ce. Th e CAN bu s a lso u ses a 120 oh m t er m in a t in g
r esist or in bot h t h e E CM a n d Sen t r y Key Rem ot e
E n t r y Modu le (SKRE E M) m odu les. Th e m odu le
t er m in a t in g r esist a n ce is m ea su r ed a cr oss bot h
CAN bu s cir cu it s a t t h e E CM or SKRE E M m odu le.
Th e con t r ol syst em a u t om a t ica lly a da pt s t o
ch a n ges in en gin e per for m a n ce, veh icle speed, a n d
t r a n sm ission t em per a t u r e va r ia t ion s t o pr ovide
con sist en t sh ift qu a lit y. Th e con t r ol syst em en su r es
t h a t clu t ch oper a t ion du r in g u psh ift in g a n d down -
sh ift in g is m or e r espon sive wit h ou t in cr ea sed
h a r sh n ess. Th e TCM con t r ols t h e a ct u a t ion of sole-
n oid va lves for m odu la t in g sh ift pr essu r e a n d gea r
ch a n ge. Th e r equ ir ed pr essu r e level is ca lcu la t ed
fr om t h e loa d con dit ion , en gin e speed. P ower for t h e
t r a n sm ission syst em is su pplied t h r ou gh t h e Tr a n s-
m ission Rela y. Th e TCM is loca t ed in t h e u n der t h e
dr iver s sea t of t h e veh icle.
Th e Tr a n sm ission Con t r ol Modu le (TCM) con t in -
u ou sly ch ecks for elect r ica l pr oblem s, m ech a n ica l
pr oblem s, a n d som e h ydr a u lic pr oblem s. Wh en a
pr oblem is sen sed, t h e TCM st or es a dia gn ost ic
t r ou ble code (DTC). Som e of t h ese codes ca u se t h e
t r a n sm ission t o go in t o lim p-in or defa u lt m ode.
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