Torque Converter Stall Test

TORQUE CONVERTER STALL TEST
This test measures the maximum engine speed when the select lever is at the "D" or "R" position and the throttle is fully opened to test the operation of the torque converter overrunning clutch and the holding ability of clutch and brake in the transaxle.

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

1. Check the automatic transaxle 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 - 90°C (176 - 194°F)
C. Engine coolant temperature : 80 - 90°C (176 - 194°F)
2. Apply chocks to both rear wheels.
3. Connect the engine tachometer.
4. Pull the parking brake lever on, with the brake pedal fully depressed.
5. Start the engine.
6. Move the select lever to the "D" position, fully depress the accelerator pedal and take a reading of the maximum engine speed at this time.

CAUTION:
- The throttle should not be left fully open for any more than 5 seconds.
- If carrying out the stall test two or more times, move the select 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.
- Move the select lever to the "R" position and carry out the same test again.

Stall rpm : 2,400 - 2,800 RPM


7. Move the select lever to the "R" position carry out the same test again.
(1) "Stall speed above specification in "D"
If stall speed is higher than specification, the rear clutch or overrunning clutch of the transaxle is slipping. In this case, perform a hydraulic test to locate the cause of slippage.
(2) Stall speed above specification in "R"
If the stall speed is higher than specification, the front clutch of the transaxle or low & reverse brake is slipping. In this case, perform a hydraulic test to locate the cause of slippage.
(3) Stall speed above specification in "D" and "R"
If the stall speed is lower than specification, insufficient engine output or a faulty torque converter is suspected.