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Automatic Transmission
Symptom Troubleshooting Index (cont'd)
Symptom
Poor acceleration;
stall speed low
Engine idle
vibration
Vehicle moves in N
14-256
Probable cause(s)
1.
Torque converter clutch
solenoid valve defective
2.
Engine output low
3.
Lock-up clutch piston
defective
4.
Lock-up shift valve
defective
1.
Low ATF level
2.
Torque converter clutch
solenoid valve defective
3.
Drive plate defective or
transmission
misassembled
4.
Engine output low
5.
Lock-up clutch piston
defective
6.
ATF pump worn or
binding
7.
Lock-up shift valve
defective
1.
Excessive ATF
2.
Foreign material in
separator plate orifice
3.
Relief valve defective
4.
1st-hold clutch defective
5.
1st clutch defective
6.
2nd clutch defective
7.
3rd clutch defective
8.
4th clutch defective
9.
5th clutch defective
10.
Clutch clearance
incorrect
11.
Needle bearing seized up,
worn, or damaged
12.
Thrust washer seized up,
worn, or damaged
Check for a stuck lock-up valve in the valve body.
•
Set idle rpm in gear to the specified idle speed. If still no
good, adjust the engine and transmission mounts.
•
Check the ATF level and check the ATF cooler lines for
leakage and loose connections. If necessary, flush the
ATF cooler lines.
•
Check the ATF level, and drain the ATF if it is over filled.
•
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 clutch end plate clearance.
•
Check all clutch pressures.
Notes
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Troubleshooting
