Mitsubishi 3000GT 1991 Service Manual page 495

CONVERTER STALL TEST
Stall test consist of determining maximum engine
speed obtained at full throttle in "D" and "I?"
positions. This test checks torque converter stator
overrunning clutch operation, and holding ability of
transaxle clutches and low-reverse brake.
Caution
During this test, make sure that no one stand in
front of or behind vehicle.
normal operating temperature [70 - 80°C (160 -
operating temperature [80 - 90°C (180 - 19O"F)l.
2. Apply chocks to both rear wheels.
3. Attach engine tachometer.
4. Apply parking and service brakes fully.
5. Start engine.
6. With selector lever in "D" position, depress
accelerator pedal fully to read engine maximum
rpm. Do not hold throttle wide open any longer
than is necessary to obtain maximum engine
rpm reading, and never longer than 5 seconds at
a time. If more than one stall test is required,
operate engine at approximately 1,000 rpm in
neutral for 2 minutes to cool transaxle fluid
between tests.
Stall speed: 2,200 - 3,200 rpm
TRANSAXLE CONTROL
Symptom
Selector lever operation
is stiff
Starter motor does not
operate with the selector
lever in the "N" or "P"
position
Will not shift to 4-speed
AUTOMATIC TRANSAXLE
Probable cause
Incorrect adjustment of sleeve
Incorrect adjustment of control cable
Excessive wear of detent plate
Worn contact surfaces of pushbutton
and sleeve
Malfunction in inhibitor switch
Incorrect adjustment of control cable
Malfunction of starter relay
Malfunction of OD switch
7. Place selector lever to "R" position and perform
stall test by the same procedure as in foregoing
item.
Stall Speed Above Specification in "D"
If stall speed is higher than specification, rear clutch
or overrunning clutch of transaxle is slipping. In this
case, perform hydraulic test to locate cause of
slippage.
Stall Speed Above Specification in "R"
If stall speed is higher than specification, front
clutch of transaxle or low-reverse brake is slipping.
In this case, perform hydraulic test to locate cause
of slippage.
Stall Speed Below Specification in "D" and "R"
If stall speed is lower than specification, insufficient
engine output or faulty torque converter is sus-
pected. Check for engine misfiring, ignition timing,
valve clearance, etc. If these are good, torque
converter is faulty.
Remedy
Adjust
Adjust
Replace
Replace
R e p l a c e
Adjust
Replace
Replace
I