Dodge Sprinter 2006 Manual page 857

VA
• P osit ion of select or lever.
• Select ed sh ift r a n ge.
• CAN sign a ls.
• E n gin e St a t u s.
E n gin e speed lim it s m a y be r ea ch ed in a ll gea r s
wit h fu ll t h r ot t le or in kick-down oper a t ion . In for-
wa r d dr ivin g, t h e sh ift r a n ge of t h e for wa r d gea r s
ca n be a dju st ed by t h e oper a t or by t ippin g t h e selec-
t or lever t o t h e left or r igh t (Au t oSt ick). H owever, t h e
TCM fea t u r es a down sh ift in h ibit or t o pr even t t h e
en gin e fr om over speedin g.
OPERA TION
Th e t r a n sm ission con t r ol m odu le (TCM) det er-
m in es t h e cu r r en t oper a t in g con dit ion s of t h e veh icle
a n d con t r ols t h e sh ift in g pr ocess for sh ift com for t a n d
dr ivin g sit u a t ion s. It r eceives t h is oper a t in g da t a
fr om sen sor s a n d br oa dca st m essa ges fr om ot h er
m odu les.
Th e TCM u ses in pu t s fr om sever a l sen sor s t h a t a r e
dir ect ly h a r dwir ed t o t h e con t r oller a n d it u ses sev-
er a l in dir ect in pu t s t h a t a r e u sed t o con t r ol sh ift s.
Th is in for m a t ion is u sed t o a ct u a t e t h e pr oper sole-
n oids in t h e va lve body t o a ch ieve t h e desir ed gea r.
Th e sh ift lever a ssem bly (SLA) h a s sever a l it em s
t h a t a r e m on it or ed by t h e TCM t o ca lcu la t e sh ift
lever posit ion . Th e r ever se ligh t swit ch , a n in t egr a l
pa r t of t h e SLA, con t r ols t h e r ever se ligh t r ela y con -
t r ol cir cu it . Th e Br a ke/Tr a n sm ission Sh ift In t er lock
(BTSI) solen oid a n d t h e pa r k lockou t solen oid (a lso
pa r t of t h e SLA) a r e con t r olled by t h e TCM.
Th e E CM a n d ABS br oa dca st m essa ges over t h e
con t r oller a r ea n et wor k (CAN C) bu s for u se by t h e
TCM. Th e TCM u ses t h is in for m a t ion , wit h ot h er
in pu t s, t o det er m in e t h e t r a n sm ission oper a t in g con -
dit ion s.
Th e TCM:
• det er m in es t h e m om en t a r y oper a t in g con dit ion s
of t h e veh icle.
• con t r ols a ll sh ift pr ocesses.
• con sider s sh ift com for t a n d t h e dr ivin g sit u a t ion .
Th e TCM con t r ols t h e solen oid va lves for m odu la t -
in g sh ift pr essu r es a n d gea r ch a n ges. Rela t ive t o t h e
t or qu e bein g t r a n sm it t ed, t h e r equ ir ed pr essu r es a r e
ca lcu la t ed fr om loa d con dit ion s, en gin e r pm , veh icle
speed, a n d ATF t em per a t u r e.
Th e followin g fu n ct ion s a r e con t a in ed in t h e TCM:
• Sh ift P r ogr a m
• Down sh ift Sa fet y
• Tor qu e Con ver t er Lock-Up Clu t ch .
• Ada pt a t ion .
Th is t r a n sm ission does n ot h a ve a TCM r ela y.
P ower is su pplied t o t h e SLA a n d t h e TCM dir ect ly
fr om t h e ign it ion .
Th e TCM con t in u ou sly ch ecks for elect r ica l pr ob-
lem s, m ech a n ica l pr oblem s, a n d som e h ydr a u lic pr ob-
lem 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
ELECTRONIC CONTROL MODULES 8E - 7
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. Som e
Lim p-In a n d ot h er s ca u se t em por a r y Lim p-In . Th e
NAG1 defa u lt s in t h e cu r r en t gea r posit ion if a DTC
is det ect ed, t h en a ft er a key cycle t h e t r a n sm ission
will go in t o Lim p-in , wh ich is m ech a n ica l 2n d gea r.
Som e DTCs m a y a llow t h e t r a n sm ission t o r esu m e
n or m a l oper a t ion (r ecover ) if t h e det ect ed pr oblem
goes a wa y. A per m a n en t Lim p-In DTC will r ecover
wh en t h e key is cycled, bu t if t h e sa m e DTC is
det ect ed for t h r ee key cycles t h e syst em will n ot
r ecover a n d t h e DTC m u st be clea r ed fr om t h e TCM
wit h t h e DRBIII sca n t ool.
TCM SIGNALS
Th e TCM r egist er s on e pa r t of t h e in pu t sign a ls by
dir ect in pu t s, t h e ot h er pa r t by CAN C bu s. In a ddi-
t ion t o t h e dir ect con t r ol of t h e a ct u a t or s, t h e TCM
sen ds va r iou s ou t pu t sign a ls by CAN C bu s t o ot h er
con t r ol m odu les.
Selector Lever Position
Th e TCM m on it or s t h e SLA for a ll sh ift lever posi-
t ion s via t h e CAN bu s.
A TF Temperature Sensor
Th e ATF t em per a t u r e sen sor is a posit ive t em per-
a t u r e co-efficien t (P TC) t h er m ist or. It m ea su r es t h e
t em per a t u r e of t h e t r a n sm ission flu id a n d is a dir ect
in pu t sign a l for t h e TCM. Th e t em per a t u r e of t h e
ATF h a s a n in flu en ce on t h e sh ift t im e a n d r esu lt in g
sh ift qu a lit y. As t h e t em per a t u r e r ises, r esist a n ce
r ises, a n d t h er efor e, t h e pr obin g volt a ge is decr ea s-
in g. Beca u se of it s r egist r a t ion , t h e sh ift in g pr ocess
ca n be opt im ized in a ll t em per a t u r e r a n ges.
Th e ATF t em per a t u r e sen sor is wir ed in ser ies
wit h t h e pa r k/n eu t r a l con t a ct . Th e t em per a t u r e sig-
n a l is t r a n sm it t ed t o t h e TCM on ly wh en t h e r eed
con t a ct of t h e pa r k/n eu t r a l con t a ct is closed beca u se
t h e TCM on ly r ea ds ATF t em per a t u r e wh ile in a n y
for wa r d gea r, or RE VE RSE . Wh en t h e t r a n sm ission
is in PARK or NE UTRAL, t h e TCM will su bst it u t e
t h e en gin e t em per a t u r e for t h e ATF t em per a t u r e.
Starter Interlock
Th e TCM m on it or s a con t a ct swit ch wir ed in ser ies
wit h t h e t r a n sm ission t em per a t u r e sen sor t o det er-
m in e PARK a n d NE UTRAL posit ion s. Th e con t a ct
swit ch is open in PARK a n d NE UTRAL. Th e TCM
sen ses t r a n sm ission t em per a t u r e a s h igh (swit ch
su pply volt a ge), con fir m in g swit ch st a t u s a s open .
Th e TCM t h en br oa dca st s a m essa ge over CAN bu s
t o con fir m swit ch st a t u s. Th e P CM r eceives t h is
in for m a t ion a n d a llows oper a t ion of t h e st a r t er cir-
cu it .
DTCs ca u se per m a n en t