Stall Speed Test

DESCRIPTION
The stall test is of extreme importance in diagnosing the condition of the automatic transmission and the engine. It should be conducted to measure the engine stall speeds in all shift ranges except the P and N ranges.

PURPOSES OF THE STALL TEST
1. To check the operation of the automatic transmission clutch.
2. To check the operation of the torque converter.
3. To check engine performance.

PREPARATIONS BEFORE TEST
1. Check that throttle valve opens fully.
2. Check that engine oil level is correct.
3. Check that coolant level is correct.
4. Check that ATF level is correct.
5. Check that differential gear oil level is correct.
6. Increase ATF temperature to 60-80°C (140-176°F) by idling the engine for approximately 30 minutes (with selector lever set to "N" or "P").

TEST METHODS
1. Install an engine tachometer at a location visible from the driver's compartment and mark the stall speed range on the tachometer scale.
2. Place the wheel chocks at the front and rear of all wheels and engage the parking brake.
3. Move the manual linkage to ensure it operates properly, and shift the selector lever to the D range.





4. While forcibly depressing the foot brake pedal, gradually depress the accelerator pedal until the engine operates at full throttle.
5. When the engine speed is stabilized, read that speed quickly and release the accelerator pedal.
6. Shift the selector lever to Neutral, and cool down the engine by idling it for more than one minute.

Stall Speed Evaluation Chart:

7. Record the stall speed.
- Stall speed at Sea level: 2,350-2,750 rpm

8. Perform the stall tests with the selector lever in the 3, 2 and R ranges.

CAUTION:
^ Do not continue the stall test for MORE THAN FIVE SECONDS at a time (from closed throttle, fully open throttle to stall speed reading). Failure to follow this instruction causes the engine oil and ATF to deteriorate and the clutch and brake band to be adversely affected.
^ Be sure to cool down the engine for at least one minute after each stall test with the selector lever set in the P or N range and with the idle speed lower than 1,200 rpm.
^ If the stall speed is higher than the specified range, attempt to finish the stall test in as short a time as possible, in order to prevent the automatic transmission from sustaining damage.