AUTOMATIC TRANSMISSION (4 A/T) 7B-19
Stall test
This test is to check overall performance of automatic transmis-
sion and engine by measuring stall speed at “D” and “R” ranges.
Be sure to perform this test only when transmission fluid is at nor-
mal operating temperature and its level is between FULL and
LOW marks.
1) Apply parking brake and block wheels.
2) Install tachometer.
3) Start engine with select lever shifted to “P”.
4) Depress brake pedal fully.
5) Shift select lever to “D” and depress accelerator pedal fully
while watching tachometer. Read engine rpm quickly when it
has become constant (stall speed).
6) Release accelerator pedal immediately after stall speed is
checked.
7) In the same way, check stall speed in “R” range.
8) Stall speed should be within following specification.
Stall speed
: 2,700 – 3,100 r/min
CAUTION:
• Do not run engine at stall more than 5 seconds contin-
uously, for fluid temperature may rise excessively high.
• After performing stall test, be sure to leave engine run-
ning at idle for longer than 30 seconds before another
stall test.
Test result Possible cause
Lower than
standard level
• Lack of engine output
• Defective torque converter
Higher than
standard level
in “D” range
• Low line pressure
• Malfunctioning 1st & 2nd brake
• Malfunctioning rear clutch
• Malfunctioning stator one-way clutch
Higher than
standard level
in “R” range
• Low line pressure
• Malfunctioning rear clutch
• Malfunctioning reverse brake
• Malfunctioning stator one-way clutch
• Malfunctioning direct clutch
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