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Automatic Transmission
Symptom Troubleshooting Index (cont'd)
Symptom
Vehicle moves in
D, D3, 2, and R,
but not in 1
Vehicle moves in
D, D3, 1, and R,
but not in 2
Vehicle moves in
D, D3, 2, and 1,
but not in R (or
moves forward
in R)
14-254
Probable cause(s)
1.
1st-hold accumulator
defective
2.
1st-hold clutch
defective
1.
2nd accumulator
defective
2.
2nd gears worn or
damaged
3.
2nd clutch defective
1.
Shift fork shaft stuck
2.
Modulator valve
defective
3.
Reverse CPC valve
defective
4.
5th accumulator
defective
5.
5th clutch defective
6.
Reverse gears worn or
damaged
•
Check the 1st-hold clutch pressure.
•
Inspect the secondary shaft and 1st/1st-hold/2nd clutch
assembly for wear and damage.
•
Inspect the clutch piston and O-rings. Check the spring
retainer for wear and damage. Inspect the clutch end-plate-
to-top-disc clearance. If the clearance is out of tolerance,
inspect the clutch discs and plates for wear and damage. If
the discs and plates are worn or damaged, replace them as
a set. If they are OK, adjust the clutch end plate clearance.
•
Check the 2nd clutch pressure.
•
Inspect the secondary shaft and 1st/1st-hold/2nd clutch
assembly for wear and damage.
•
Inspect the clutch piston and O-rings. Check the spring
retainer for wear and damage. Inspect the clutch end-plate-
to-top-disc clearance. If the clearance is out of tolerance,
inspect the clutch discs and plates for wear and damage. If
the discs and plates are worn or damaged, replace them as
a set. If they are OK, adjust the clutch end plate clearance.
•
Check the line pressure and 5th clutch pressure.
•
Check for a missing shift fork bolt on the shift fork shaft.
•
Check the ATF strainer for debris. If the ATF strainer is
clogged with particles of steel or aluminum, inspect the ATF
pump. If the ATF pump is OK, find the damaged
components that caused the debris. If no cause for the
contamination is found, replace the torque converter.
•
Inspect the reverse selector gear teeth chamfers, and
inspect engagement teeth chamfers of the countershaft 5th
gear and reverse gear. Replace the reverse gears and the
reverse selector if they are worn or damaged. If the
transmission makes clicking, grinding, or whirring noises,
also replace the mainshaft 5th gear, reverse idler gear, and
countershaft 5th gear.
•
If the 5th clutch feed pipe guide in the end cover is scored
by the mainshaft, inspect the ball bearing for excessive
movement in the transmission housing. If the ball bearing is
OK, replace the end cover as it is dented. The O-ring under
the guide is probably worn.
•
Replace the mainshaft if the bushing for the 4th and 5th
clutch feed pipes are loose or damaged. If the 5th clutch
feed pipe is damaged or out of round, replace the end cover.
•
Inspect the clutch piston, clutch piston check valve, and O-
rings. Check the spring retainer for wear and damage.
Inspect the clutch end-plate-to-top-disc clearance. If the
clearance is out of tolerance, inspect the clutch discs and
plates for wear and damage. If the discs and plates are worn
or damaged, replace them as a set. If they are OK, adjust the
clearance with the clutch end plate.
Notes
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Troubleshooting
