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11) 3-4 & select timing valve
When upshift from the 3rd gear to the 4th gear takes place,
the 3-4 & select timing valve makes the turning OFF of the
pressure C2 synchronized with the turning OFF of the pres-
sure B1', thus preventing the engine from racing and making
smooth shifting possible.
When the transmission is in the 3rd gear, the forces applied to
the valve are the spring force (force F
side), and line pressure q (pressure B1') (force pushing to
the right side). Since a condition of F
valve is located at the right side. If the line pressure q (pres-
sure B1') is turned OFF when upshifting to the 4th gear, the
valve moves to the left side. Also, r and t are connected to
each other simultaneously. In this way, the pressure C2 w will
be quickly drained.
12) 2-3 timing valve
When gear shift takes place between the 2nd gear and the 3rd gear, the 2-3 timing valve raises the pres-
sure C3 after the pressure C1 reaches a certain pressure.
When the transmission is in the 2nd gear with the shift lever set to the Î range, the forces applied to the
valve are the spring force (force F
right side) from the manual valve. Furthermore, since a condition of F
at the right side. When upshifting from the 2nd gear to the 3rd gear takes place, the line pressure t (force
F
pushing to the left side) from the 2-3 shift valve is applied gradually via the orifice. As a result, at the
L'
point when a condition of F
are connected to each other. Consequently, the line pressure w is applied to the C3 via e.
<D range, 1st and 2nd gears>
q
w e r
q
Line pressure , From manual valve
w
Line pressure , From 2-3 shift valve
e
To C3
pushing to the left
S
< F
is satisfied, the
S
L
pushing to the left side), and line pressure q (force F
S
is satisfied, the valve moves to the left. At the same time, w and e
+ F
> F
S
L'
L
t
(Î, x and Ò ranges)
(3rd and 4th gears)
Orifice
q
w
e
< F
S
<D range, except for 1st and 2nd gears>
q
w e r
r
Line pressure , From 3-4 shift valve (4th gear)
t
Line pressure , From 2-3 shift valve (3rd and 4th gears)
AT–21
q
r
t
y
e
Check valve
Line pressure (pressure B1')
From C2
3-4 shift valve / Drain
pushing to the
L
is satisfied, the valve is located
L
t
w
JAT00033-00026
JAT00034-00027
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