Dodge Sprinter 2006 Manual page 1912

21 - 174 AUTOMA TIC TRANSMISSION NAG1 - SERVICE INFORMA TION
SHIFT PRESSURE CONTROL SOLENOID VALVE
Fig. 232 Shift Pressure Control Solenoid Valve
1 - SHIFT PRESSURE CONTROL SOLENOID VALVE
2 - CONTACT SPRING
3 - CONDUCTOR TRACK
4 - VALVE HOUSING SHIFT PLATE
5 - CONDUCTOR TRACK
6 - CONTACT SPRING
Th e sh ift pr essu r e con t r ol solen oid va lve (1) (F ig.
232) is loca t ed in t h e sh ell of t h e elect r ic va lve con -
t r ol u n it a n d pr essed a ga in st t h e sh ift pla t e by a
spr in g.
It s pu r pose is t o con t r ol t h e sh ift pr essu r e depen d-
in g on t h e con t in u ou sly ch a n gin g oper a t in g con di-
t ion s, su ch a s loa d a n d gea r ch a n ge.
Th e sh ift pr essu r e r egu la t in g solen oid va lve (1) h a s
a n in t er fer en ce fit a n d is sea led off t o t h e va lve body
of t h e sh ift pla t e (4) by a sea l (a r r ow). Th e con t a ct
spr in gs (2) a t t h e solen oid va lve en ga ge in a slot in
t h e con du ct or t r a cks (3). Th e for ce of t h e con t a ct
spr in gs (2) en su r es secu r e con t a ct s.
OPERA TION
Wh en a n elect r ica l cu r r en t is a pplied t o t h e sole-
n oid coil, a m a gn et ic field is cr ea t ed wh ich pr odu ces
a n a t t r a ct ion t o t h e plu n ger, ca u sin g t h e plu n ger t o
m ove a n d wor k a ga in st t h e spr in g pr essu r e a n d t h e
loa d a pplied by t h e flu id t h e va lve is con t r ollin g. Th e
plu n ger is n or m a lly dir ect ly a t t a ch ed t o t h e va lve
wh ich it is t o oper a t e. Wh en t h e cu r r en t is r em oved
fr om t h e coil, t h e a t t r a ct ion is r em oved a n d t h e
plu n ger will r et u r n t o it s or igin a l posit ion du e t o
spr in g pr essu r e.
Th e plu n ger is m a de of a con du ct ive m a t er ia l a n d
a ccom plish es t h is m ovem en t by pr ovidin g a pa t h for
t h e m a gn et ic field t o flow. By keepin g t h e a ir ga p
bet ween t h e plu n ger a n d t h e coil t o t h e m in im u m
n ecessa r y t o a llow fr ee m ovem en t of t h e plu n ger, t h e
m a gn et ic field is m a xim ized.
UPSHIFT / DOWNSHIFT SOLENOID VALVES
Fig. 233 Upshift/Downshift Solenoid Valves
1 - UPSHIFT/DOWNSHIFT SOLENOID VALVE
2 - CONTACT SPRING
3 - CONDUCTOR TRACK
4 - O-RING
5 - VALVE HOUSING OF SHIFT PLATE
6 - O-RING
7 - CONDUCTOR TRACK
8 - CONTACT SPRING
If a solen oid va lve (1) (F ig. 233) is a ct u a t ed by t h e
TCM, it open s a n d gu ides t h e con t r ol pr essu r e (p-SV)
t o t h e a ssign ed com m a n d va lve. Th e solen oid va lve
r em a in s a ct u a t ed a n d t h er efor e open u n t il t h e sh ift -
in g pr ocess is com plet e. Th e sh ift pr essu r e (p-SV) t o
t h e com m a n d va lve is r edu ced t o zer o a s soon a s t h e
power su pply t o t h e solen oid va lve is in t er r u pt ed.
VA