Stall Test

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





2. Drive vehicle for approximate. 10 minutes or until engine oil and ATF 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 put a mark on 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 more than 5 seconds.
Stall revolution: 2,440 - 2,640 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 C result are shown in the illustration. In order to pinpoint the possible damaged components, follow the "Work Flow Chart". Work Flow

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