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The purpose of this test is to
measure the maximum engine speed when the torque converter
stalls in D or R ranges in order to check the torque
converter (Stator and one-way clutch operation) and the
holding performance of the clutches and brakes which are
built into the transmission.
| warning |
For safety, the front and rear
of the vehicle should be kept clear of other
people while this test is being carried
out.
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1.Check the A/T fluid level, the
A/T fluid temperature and the engine coolant
temperature.
- A/T fluid level: HOT position on oil level
gauge
- A/T fluid temperature: 70 -
80°C
- Engine coolant temperature: 80 -
100°C
| note |
The A/T fluid
temperature is measured with
M.U.T.-III.
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2.Place wheel locks on both the left and
right front wheels.
3.Pull the parking brake lever
to apply the parking brake and depress the brake pedal
fully.
4.Start the engine.
5.
| caution |
- Do not keep the throttle fully open for
any longer than 5 seconds.
- If you repeat the stall test when the
A/T fluid temperature is greater
than 80°C, move the selector lever
to the "N" position and let the engine
run at approximately 1,000 r/min
for at least one minute. Wait until the
A/T fluid temperature returns to
80°C or less.
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Move the selector lever to the D position, fully
depress the accelerator pedal and quickly take a reading of
the maximum engine speed at this time.
Standard
stalling engine speed: 2, 300 - 2, 800
r/min
6.Move the selector lever to
the R position and repeat the test described
above.
Standard stalling engine speed: 2, 300
- 2, 800 r/min
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- Stall speed is too high in both D and R
ranges
- Malfunction of the torque converter
(Slippage on the splines of the torque converter
and the input shaft)
- Low line pressure
- Low-reverse brake slippage and
malfunction of the one-way clutch
- Stall speed is too high in D range
only
- Underdrive clutch slippage
- Stall speed is too high in R range
only
- Stall speed is too low in both D and R
ranges
- Malfunction of the torque converter
(Slippage of the one-way clutch)
- Low line pressure
- Poor engine output
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