POWER TRAIN
-
Automatic Transaxle
2-63
Reverse Block Above Eight MPH
I/
Reverse gear will not engage if the TCM senses
vehicle speed above eight mph. This is to prevent
damage that could occur if a driver accidentally
puts the gear selector in
“R”
while rolling in any
forward gear range. If the output speed sensor de-
tects that the output shaft is spinning at a speed
equal to or greater than eight mph, the TCM activates
reverse block to protect the transaxle. The function
REVERSE BLOCK
Shift to Rev. w/speed over 8 mph
REVERSE BLOCK
SHIFT TO REV. Y/SPEED OVER 8 MPH
LR(R-N-I
)
24(2-4)
UD(I
-2-3)
OD(3-4)
R
is inoperable in “limp-in” mode. To accomplish or
initiate reverse block, the TCM energizes the
2-4/LR
solenoid. The solenoid prevents line pressure from
applying the low/reverse clutch. Without a holding
element, the planetary
gearset
in this range will
provide no output. It must have both an input and
a holding element to provide output. In this condition,
the transaxle is effectively in Neutral.
LR
=
Low reverse
UD
=
Underdrive
R
=
Reverse
AC
=
Accumulator
PT
=
Pressure tap
S
=
Solenoid
24
=
2-4 clutch
OD
=
Overdrive
SW
=
Switch
CC
=
Converter CL
D
=
Dribbler
V
=
Vent
(RE
SW=SWITCH
AC=ACCUMULATOR
CC
iCONVERTER
CL.
/j
PT
[
,)j
S
=SOLENOID
v
=VENT
r,&,“”
r’lI
’
,,
. .
-
,,
-
II
VENT
,
RESf;lR[
rxr&
PRESSURE(PSI)
AT,500RPM
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