Converter Stall Speed Test

TORQUE CONVERTER STALL TEST





This test measures the maximum engine speed when the selector lever is at the "D" or "R" position and the torque converter stalls this test the operation of the torque converter, starter motor and one-way clutch operation and the holding performance of the clutches and brakes in the transaxle.

WARNING: Do not let anybody stand in front of or behind the vehicle is test is being carried out.

1. Check the A/T fluid level and temperature. Check the engine coolant temperature.
- A/T fluid level: At the "HOT" mark on the dipstick
- A/T fluid temperature: 70 - 90°C (158 - 194°F)
- Engine coolant temperature: 80 - 100°C (176 - 212°F)
2. Chock both rear wheels.
3. Connect a tachometer.
4. Apply the parking and service brakes fully.
5. Start the engine.
6. Move the selector lever to the "D" position. Fully depress the accelerator pedal and read the maximum engine speed.

CAUTION:
- The throttle should not be left fully open for any more than eight 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 A/T fluid cool down before carrying out subsequent tests.

Standard value: Stall speed: 2,100 - 2,600 r/min
7. Move the selector lever to the "R" position and repeat step 6.
Standard value: Stall speed: 2,100 - 2,600 r/min

TORQUE CONVERTER STALL TEST JUDGEMENT RESULTS
1. Stall speed is too high in both "D" and "R" ranges
- Low line pressure
- Low-reverse brake slippage and malfunction of one-way clutch
2. Stall speed is too high in "D" range only
- Underdrive clutch slippage
3. Stall speed is too high in "R" range only
- Reverse clutch slippage
4. Stall speed too low in both "D" and "R" ranges
- Malfunction of torque converter
- Insufficient engine output