Stall Testing
STALL TESTINGStall test procedure
1. Check A/T and engine fluid levels. If necessary, add.
2. Warm up engine until engine oil and ATF reach operating temperature after vehicle has been driven approx. 10 minutes.
^ 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 speed 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:
2,450 - 2,650 rpm
8. Shift selector lever to "N".
9. Cool off ATF.
^ Run engine at idle for at least one minute.
10. Perform stall tests in the same manner as in steps 5 through 9 with selector lever in "2","1" and "R", respectively.
Judgement of Stall Test
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, follow the WORK FLOW chart.
Note
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 in 1st through 3rd gears in "D" position and engine brake functions with power shift switch set to "POWER", or slippage occurs in 1st and 2nd gears in "2" position and engine brake functions with accelerator pedal completely 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. ..... 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