Dodge Sprinter 2006 Manual page 1776

21 - 38 AUTOMA TIC TRANSMISSION NAG1 - SERVICE INFORMA TION
First Gear Engaged
1 - HOLDING CLUTCH B1
2 - DRIVING CLUTCH K1
3 - HOLDING CLUTCH B3
4 - DRIVING CLUTCH K3
5 - HOLDING CLUTCH B2 PISTON
6 - HOLDING CLUTCH B2 PISTON OPPOSING FACE
7 - SHIFT PRESSURE REGULATING SOLENOID
8 - SHIFT PRESSURE REGULATING VALVE
9 - SHIFT VALVE B2
10 - 3-4 SHIFT SOLENOID
Th e TCM m on it or s t h e a ct iva t ion sequ en ce via t h e
speed of t h e in pu t sh a ft , wh ich slows down a s t h e
fr ict ion a l con n ect ion in t h e m u lt iple-disc h oldin g
clu t ch in cr ea ses. Wh en t h e speed dr ops t o t h e speci-
fied level, t h e TCM sh u t s off t h e power t o t h e 3-4
sh ift solen oid va lve (10) (F ig. 25). Th e spr in g ch a m -
ber of t h e sh ift va lve B2 (9) is depr essu r ized a n d
swit ch es down wa r ds. Th is con n ect s t h e lin e t o t h e
opposin g fa ce of t h e pist on B2 (6) wit h t h e pr essu r e
h oldin g va lve (11). Th e pr essu r e on t h e opposin g fa ce
of t h e pist on B2 (6) dr ops t o a r esidu a l pr essu r e.
Th e wor kin g pr essu r e (p-A) is for m ed a n d t r a vels
via t h e 2-3 h oldin g pr essu r e sh ift va lve, t h e 2-3 com -
m a n d va lve a n d t h e ba ll va lve (16) t o m u lt i-pla t e
clu t ch K3 (4) a n d via t h e 3-4 com m a n d va lve (13) t o
t h e en d fa ce of t h e 3-4 sh ift pr essu r e sh ift va lve (14).
Th e 3-4 sh ift pr essu r e sh ift va lve (14) is m oved
a ga in st t h e for ce of t h e spr in g t owa r ds t h e r igh t . At
Fig. 25 First Gear Engaged
11 - PRESSURE HOLDING VALVE
12 - 3-4 HOLDING PRESSURE SHIFT VALVE
13 - 3-4 COMMAND VALVE
14 - 3-4 SHIFT PRESSURE SHIFT VALVE
15 - 3-4 OVERLAP REGULATING VALVE
16 - BALL VALVE
17 - 1-2/4-5 COMMAND VALVE
18 - 1-2/4-5 COMMAND VALVE
19 - BALL VALVE
t h e sa m e t im e t h e 3-4 solen oid va lve (10) is en er-
gized. Th is a llows sh ift va lve pr essu r e (p-SV) t o en t er
t h e spr in g ch a m ber of t h e sh ift va lve B2 (9) a n d t o
r ea ch t h e en d fa ce of t h e 3-4 com m a n d va lve (13).
Th e sh ift va lve B2 (9) is h eld in t h e u pper posit ion
a n d t h e 3-4 com m a n d va lve (13) swit ch es t owa r ds t h e
r igh t . At t h e en d fa ce of t h e 3-4 sh ift pr essu r e sh ift
va lve (14) t h e wor kin g pr essu r e (p-A) is r epla ced by
sh ift va lve pr essu r e (p-SV).
Th e 3-4 com m a n d va lve (13) m oves t o t h e left .
Wor kin g pr essu r e (p-A) t r a vels via t h e h oldin g pr es-
su r e sh ift va lve (12) a n d t h e 3-4 com m a n d va lve (13)
t o t h e pist on of m u lt iple-disc h oldin g clu t ch B2 (5).
VA