Chrysler laser 1990 Technical Information Manual page 304

AUTOMATIC TRANSAXLE - Transaxle Control
valve
pressure pressure
To shift
control
valve
pressure pressure
Upshift
from 2nd to 3rd Gear
(1) When the shift control valve comes into 3rd gear position
and the 3rd pressure is established, the pressure is
directed to the No.7 port of the end clutch valve through
the No.7 line. In this instance, the 3rd pressure is blocked
ahead by the end clutch valve and the check ball.
(2) If a shift to the 3rd gear is initiated, the pressrue begins to
be directed from the 2-3/4-3 shift valve to the front clutch
and the release side chamber of kickdown servo cylinder.
The same pressure also is directed to the chamber at the
right end of the end clutch valve through the No. 12 line.
During the shift to the 3rd gear, the pressure in the No. 12
line is regulated by the pressure control valve to a level
lower than the line pressure so that the No. 12 line pressure
is not high enough to force the end clutch valve toward the
175011:
(3) Once the front clutch has been engaged and the kickdown
brake released, the No. 12 line pressure is raised to a level .
equivalent to the line pressure.
This means that the pressures at both ends of the end
clutch valve (or No. 6 line pressure and No. 12 line pressure)
are at the same level. However, as the area of the #3 land
to which pressure is applied is larger than that of the # 1
land of the end clutch valve, the valve is pushed to left, thus
opening the No. 18 port. This allows the 3rd pressure (line
pressure) already established in the No. 7 line to be directed
to the end clutch through the..No.7 port. The end clutch is
now engaged.
Downshift from 3rd to
pressure are released, and therefore, the pressure in the
end clutch valve right end chamber is also released.
valve by the 2nd pressure working on its left end, closing
the No.7 port and releasing the end clutch pressure
through the No.8 port. Now the end clutch is released,
--
I