Datsun 1980 200SX Service Manual page 229

Hydraulic
Control
Circuiu
AUTOMATIC TRANSMISSION
1 RANGE
LOW AND 2ND GEAR
The range
I
position
is
used
to
lock the
car
in 1 st gear
preventing
any
upshifts If the selectorJever
is moved
to
the
1
position
while the
car
is
moving
at
high speeds
the transmis
sion will
not
shift into fIrst
gear
until
car
speed
slows
to
approximately
50
km h
30
MPH Instead
i1
will shift
to
Manual alYe
second I
as
governor
pressUre
pre
vents
the
1
2 shift valve from
closing
Power flow
The
power
flow
in I differs
slight
Iy from D
in
that
the low
and
reverse
band
is
applied to
hold the
rear gear
set planet carrier
providing engine
braking Power flow
in I is 1he
same
as
in D
1
Governor
Valve
15 Pressure Modifier Valve
Fluid flow
Low gear
Manual
pressure
passing
through
the
1 2
shift valve
is used
to
close
the
1 2 shift valve
preventing
a
1 2 up
shift Manual pressure
passing through
the
downshift valve locks the
2 3
shift
valve closed
along
with applying
addi
tional
c1
sing
pre
ssure
to
the
1 2 shift
valve
2nd lnl Tuning Valve
to lst 2nd Shift Valve
lst 2nd Shift Valve
2nd lrd Shift Valve
j
Rear Clutch
I
4
Solenoid Downshift Valve 13
t2nd
lrd Shift Valve
Ist
2nd Shift
Valve
Throttle Back
up
Valve
5 Ist 2nd Shift Valve
12
FluId flow 2n l
gear
Manual Valve
lbrottle Back
up
Valve
I
Low
Ii Reverse Brake
I
1 Governor
Valve 15 Pressure Modifier Valve
2nd lnl Shift Valve
2nd 3rd Timing Valve
1st
2nd Shift
Valve
8
1st
2nd
Shift
Val
Second Lock Valve
91 Band Servo I
Apply
Side
j
Rear
Clutch
I
4 Solenoid Downshift Valve
13
t2nd
lrd Shift Valve
1st 2nd
Shit
t
Valve
Throttle
Back up
Valve
17
1
2nd lrd Shift Valve
Pressure Modifier Valve
2nd
3rd Timing
Valve
Throttle Drain Valve
5 bt 2ndShiftValve
Pressure
Regulator Valve
AT 22