Dodge Sprinter 2006 Manual page 1921

VA
TORQUE CONVERTER CLUTCH (TCC)
Fig. 250 Torque Converter Lock-up Clutch
1 - TURBINE
2 - IMPELLER
3 - STATOR
4 - INPUT SHAFT
5 - STATOR SHAFT
6 - PISTON
7 - COVER SHELL
8 - INTERNALLY TOOTHED DISC CARRIER
9 - CLUTCH PLATE SET
10 - EXTERNALLY TOOTHED DISC CARRIER
11 - TURBINE DAMPER
In a st a n da r d t or qu e con ver t er, t h e im peller (2)
a n d t u r bin e (1) a r e r ot a t in g a t a bou t t h e sa m e speed
a n d t h e st a t or (3) is fr eewh eelin g, pr ovidin g n o
t or qu e m u lt iplica t ion . By a pplyin g t h e t u r bin e's pis-
t on a n d fr ict ion m a t er ia l (9) (F ig. 250), a t ot a l con -
ver t er en ga gem en t ca n be obt a in ed. Th e r esu lt of t h is
en ga gem en t is a dir ect 1:1 m ech a n ica l lin k bet ween
t h e en gin e a n d t h e t r a n sm ission .
Th e clu t ch ca n be en ga ged in secon d, t h ir d, fou r t h ,
a n d fift h gea r r a n ges.
Th e TCM con t r ols t h e t or qu e con ver t er by wa y of
in t er n a l logic soft wa r e. Th e pr ogr a m m in g of t h e soft -
wa r e pr ovides t h e TCM wit h con t r ol over t h e t or qu e
con ver t er solen oid. Th er e a r e fou r ou t pu t logic st a t es
t h a t ca n be a pplied a s follows:
• No E MCC
• P a r t ia l E MCC
• F u ll E MCC
• Gr a du a l-t o-n o E MCC
NO EMCC
Un der No E MCC con dit ion s, t h e TCC Solen oid is
OF F. Th er e a r e sever a l con dit ion s t h a t ca n r esu lt in
AUTOMA TIC TRANSMISSION NAG1 - SERVICE INFORMA TION 21 - 183
NO E MCC oper a t ion s. No E MCC ca n be in it ia t ed
du e t o a fa u lt in t h e t r a n sm ission or beca u se t h e
TCM does n ot see t h e n eed for E MCC u n der cu r r en t
dr ivin g con dit ion s.
PARTIAL EMCC
P a r t ia l E MCC oper a t ion m odu la t es t h e TCC Sole-
n oid (du t y cycle) t o obt a in pa r t ia l t or qu e con ver t er
clu t ch a pplica t ion . P a r t ia l E MCC oper a t ion is m a in -
t a in ed u n t il F u ll E MCC is ca lled for a n d a ct u a t ed.
Du r in g P a r t ia l E MCC som e slip does occu r. P a r t ia l
E MCC will u su a lly occu r a t low speeds, low loa d a n d
ligh t t h r ot t le sit u a t ion s.
FULL EMCC
Du r in g F u ll E MCC oper a t ion , t h e TCM in cr ea ses
t h e TCC Solen oid du t y cycle t o fu ll ON a ft er P a r t ia l
E MCC con t r ol br in gs t h e en gin e speed wit h in t h e
desir ed slip r a n ge of t r a n sm ission in pu t speed r ela -
t ive t o en gin e r pm .
GRADUAL - TO - NO EMCC
Th is oper a t ion is t o soft en t h e ch a n ge fr om F u ll or
P a r t ia l E MCC t o No E MCC. Th is is don e a t m id-
t h r ot t le by decr ea sin g t h e TCC Solen oid du t y cycle.
REMOVAL
(1) Rem ove t r a n sm ission a n d t or qu e con ver t er
fr om veh icle.
(2) P la ce a su it a ble dr a in pa n u n der t h e con ver t er
h ou sin g en d of t h e t r a n sm ission .
CAUTION: Verify that transmission is secure on the
lifting device or work surface, the center of gravity
of the transmission will shift when the torque con-
verter is removed creating an unstable condition.
The torque converter is a heavy unit. Use caution
when separating the torque converter from the
transmission.
(3) P u ll t h e t or qu e con ver t er for wa r d u n t il t h e cen -
t er h u b clea r s t h e oil pu m p sea l.
(4) Sepa r a t e t h e t or qu e con ver t er fr om t h e t r a n s-
m ission .