Stall Test

STALL TEST PROCEDURE
1. Check A/T fluid and engine oil levels. If necessary, add fluid and oil.





2. Drive vehicle for approximately 10 minutes or until fluid and oil reach operating temperature.
ATF operating temperature: 50 - 80°C (122 - 176°F)





3. Set parking brake and block wheels.
4. Install a tachometer where it can be seen by driver during test.
- It is good practice to mark the point of specified engine rpm on indicator.





5. Start engine, apply foot brake, and place selector lever in D position.
6. Accelerate to wide open throttle gradually while applying foot brake.
7. Quickly note the engine stall revolution and immediately release throttle.
During test, never hold throttle wide open for less than 5 seconds.
Stall revolution: 2,300 - 2,500 rpm





8. Move selector lever to "N" position.
9. Cool off ATF.
Run engine at idle for at least one minute.
10. Repeat steps 5 through 9 with selector lever in "2", "1" and "R" positions.

JUDGEMENT OF STALL TEST





The test result and possible damaged components relating to each result are shown in the illustration. In order to pinpoint the possible damaged components, refer to "Work Flow" shown under Testing and Inspection; Procedures; Diagnostic Strategies.

Stall revolution is too high in "D" or "2" position:
- Slippage occurs in 1st gear but not in 2nd and 3rd gears -> Low one-way clutch slippage
- Slippage occurs at the following gears:
1st through 3rd gears in "D" position and engine brake functions.
1st and 2nd gears in "2" position and engine brake functions with accelerator pedal released (fully closed throttle) -> Forward clutch or forward one-way clutch slippage

Stall revolution is too high in "R" position:
- Engine brake does not function in "1" position -> Low & reverse brake slippage
- Engine brake functions in "1" position -> Reverse clutch slippage

Stall revolution within specifications:
- Vehicle does not achieve speed of more than 80 km/h (50 MPH) -> One-way clutch seizure in torque converter housing

CAUTION: Be careful since automatic fluid temperature increases abnormally.

- Slippage occurs in 3rd and 4th gears in "D" position -> High clutch slippage
- Slippage occurs in 2nd and 4th gear in "D" position -> Brake band slippage

Stall revolution less than specifications:
- Poor acceleration during starts -> One-way clutch seizure in torque converter