Mechanical System Tests (A340F) - Toyota Hilux Surf 1993 Owner's Manual

AT–196
Mechanical System Tests
STALL TEST
The object of this test is to check the overall performance of the transmission and engine by measuring the
stall speeds in the D and R positions.
NOTICE:
Perform the test at normal operating fluid temperature (50–80E C or 122–176E F).
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Do not continuously run this test longer than 5 seconds.
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To ensure safety, conduct this test in a wide, clear, level area, which provides good traction.
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The stall test should always be carried out in pairs. One should observe the conditions of wheels or
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wheel stoppers outside the vehicle while the other is performing the test.
MEASURE STALL SPEED
(a) Check the front and rear wheels.
(b) Connect a tachometer to the engine.
(c) Fully apply the parking brake.
(d) Keep your left foot pressed firmly on the brake pedal.
(e) Start the engine.
(f) Shift into the D position. Step all the way down on the accelerator pedal with your right foot.
Quickly read the stall speed at this time.
NOTICE: Release the accelerator pedal and stop test if the rear wheels begin to rotate before the en–
gine speed reaches specified stall speed.
Stall speed: 2,200 f 150 RPM
(g) Perform the same test in R position.
EVALUATION
(a) If the stall speed is the same for both positions but lower than specified value:
Engine output may be insufficient
Stator one–way clutch is not operating properly
HINT: If more than 600 RPM below the specified value, the torque converter clutch could be faulty.
(b) If the stall speed in D position is higher than specified:
Line pressure too low
Forward clutch slipping
No.2 one–way clutch not operating properly
O/D one–way clutch not operating properly
(c) If the stall speed in R position is higher than specified:
Line pressure too low
Direct clutch slipping
First and reverse brake slipping
O/D one–way clutch not operating properly
(d) If the stall speed in both R and D positions are higher than specified:
Line pressure too low
Improper fluid level
O/D one–way clutch not operating properly
AUTOMATIC TRANSMISSION – Troubleshooting (Mechanical System Tests)