Torque Converter Stall Test

Torque Converter Stall Test
This test measures the maximum engine speed when the selector lever is in the D or R position. The torque converter stalls to test the operation of the torque converter, starter motor, one-way clutch operation, the holding performance of the clutches, and brakes in the transaxle.

CAUTION:
Do not let anybody stand in front of or behind the vehicle while this test is being carried out

1. Check the automatic transmission fluid level and temperature, and the engine coolant temperature.
A. Fluid level : At the HOT mark on the oil level gauge
B. Fluid temperature : 80 - 100°C (176 - 212°F)
C. Engine coolant temperature : 80 - 100°C(176 - 212°F)
2. Prevent all the wheels from moving during the test.
3. Pull the parking brake lever up, with the brake pedal fully depressed.
4. Start the engine.
5. Move the selector lever to the "D" position, fully depress the accelerator pedal and take a reading of the maximum engine speed at this time.

Stall speed : 2,100 - 2,900rpm

CAUTION:
- The throttle should not be left fully open for any more than five seconds.
- If carrying out the stall test two or more times, move the selector lever to the "N" position and run the engine at 1,000 r/min to let the automatic transaxle fluid cool down before carrying out subsequent tests.

6. Move the selector lever to the "R" position and carry out the same test again.

Torque Converter Stall Test Conclusion
1. Stall speed is too high in both "D" and "R" ranges
A. Low line pressure
B. Low & reverse brake(B) slippage
2. Stall speed is to high in "D" range only
A. Underdrive clutch(C) slippage
3. Stall speed is too high in "R" range only
A. Reverse clutch(A) slippage
4. Stall speed too low in both "D" and "R" ranges
A. Malfunction of torque converter(D)
B. Insufficient engine output