Chrysler DODGE D150 1993 Service Manual page 1106

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AUTOMATIC TRANSMISSION—32RH/36RH/37RH/42RH/46RH 2 1 - 1 0 5
Condition
Possible Co use Correction
N O 3-4 U P S H I F T
1.
Fourth
gear overdrive
switch (on
dash) in
OFF
1. Turn control
switch
to O N position
2.
position
Overdrive circuit fuse blown
2. Replace fuse; determine why fuse failed
and repair a s necessary (i.e., shorts,
grounds in
circuit)
3.
Fourth gear overdrive switch
shorted, o p e n ,
wires
loose
3. Replace switch if shorted or open a n d
repair loose or d a m a g e d wires
4. Overdrive solenoid or circuit wire loose,
shorted,
open
4. Check wires/connections with 12V test lamp
and voltmeter; repair d a m a g e d or loose
wires/connections as necessary
5.
Solenoid feed orifice in
valve b o d y
is blocked
5. Remove, disassemble, clean valve b o d y
thoroughly
6.
Fourth gear overdrive solenoid
failure 6. Verify solenoid failure with test lamp and
replace solenoid
7. Sensor failure (vehicle
speed
sensor or coolant
sensor)
7. Test both sensors with test lamp or volt/
ohmmeter and replace
faulty
sensor
8.
Park/neutral
switch
open or shorted
or
switch
wire to powertrain control module
is d a m a g e d
(loss of
park/neutral
input)
8. Test switch a s described in service section
and replace if necessary
9. Powertrain
control
module faulty
9. Check with D R B II scan tool and replace if
necessary
10. T.P.S. fault 10. Adjust or replace T.P.S.
11.
Transmission
fluid temperature sensor
fault (if
equipped)
12.
Overdrive
piston seal
failure
13. W r o n g
overdrive piston
spacer
11. Replace sensor
12. Replace both seals
13. Remove unit, check end play, and install
correct spacer
14. Low hydraulic pressure
14. Pressure test transmission to determine
cause
15.
Set-reset
module
faulty
15. Replace module (if equipped)
S U P S
IN OVERDRIVE
FOURTH GEAR
1.
2.
Low fluid
level
Overdrive
piston
or seal malfunction
1. A d d fluid and check for leaks
2. Remove overdrive unit; replace piston seals
if worn; replace piston if d a m a g e d , if piston
retainer is d a m a g e d , it will be necessary to
remove and disassemble the transmission
3.
Overdrive
clutch pack w o r n
3. Remove overdrive unit and rebuild clutch pack
4. 3-4
shift valve, timing valve, or
accumulator
malfunction
4. Remove and overhaul valve body. Replace
accumulator seals. Make sure all valves operate
freely in bores, and do not bind or stick. Make
sure valve body screws are correctly tightened
and separator plates are properly positioned
5.
Overdrive
piston
retainer
bleed
orifice
blown
out
5. Disassemble transmission, remove retainer,
and replace orifice
6.
Overdrive unit
thrust
bearing
failure 6. Disassemble overdrive unit and replace
thrust bearing ( N o . 1 thrust bearing is
between overdrive piston and clutch hub;
N o . 2 thrust bearing is between the
planetary gear and the direct clutch spring
plate; N o .
3 thrust
bearing is between
overrunning clutch hub and output shaft)
J9321-252
42RH/46RH OVERDRIVE DIAGNOSIS