Stall Speed Test

WARNING: Apply the parking brake firmly while performing each stall test.

CAUTION: Perform Line Pressure Test prior to performing Stall Test. If the line pressure is low at stall, do not perform Stall Test or further transmission damage will occur.

The stall speed test checks:
- torque converter clutch operation.
- holding ability of the forward clutch.
- reverse clutch (the low-reverse bands).
- planetary one-way clutch.
- engine performance.

Conduct this test with the engine coolant and transmission fluid at proper levels and at normal operating temperature.

Apply the parking brake firmly for each stall speed test.





1. Find the specified stall rpm for the vehicle: refer to Stall Speed Diagnosis Chart. Use a grease pencil to mark the rpm on the dial of a tachometer.


2. Connect a tachometer to the engine.

3. NOTE: If the rpm recorded by the tachometer exceeds the maximum limits, release the accelerator pedal immediately because clutch or band slippage is indicated.

In each of the following ranges D, 2, 1, R, press the accelerator pedal to the floor and hold it just long enough to let the engine get to wide open throttle (WOT). While making this test, do not hold the throttle open for more than 5 seconds at a time.
4. Note the results in each range.
5. After each range, move the transmission range selector lever to Neutral and run the engine at 1000 rpm for about 15 seconds to cool the before making the next test.

Stall Speed Diagnosis Chart:

6. Refer to the above chart for corrective actions.