Stall Speed Test

Stall Speed Test
This test checks operation of the following items:
^ Torque converter clutch (TCC)
^ Forward clutch
^ Low one-way clutch (OWC) assembly
^ Engine driveability concerns
^ Overdrive one-way clutch assembly

WARNING: Block all wheels, set the parking brake and firmly apply the service brake to reduce the risk of vehicle movement during this procedure. Failure to follow these instructions may result in serious personal injury.

CAUTION: Always carry out the Line Pressure Test procedures prior to carrying out the Stall Speed Test. If line pressure is low at stall, do not carry out the Stall Speed Test or further transmission damage will occur.

CAUTION: After testing each of the following ranges D, 3, 2, 1 and R, move the selector lever to NEUTRAL and run the engine at 1,000 rpm for about 15 seconds to allow the torque converter to cool before testing the next range. Failure to follow this instruction may result in transmission damage.

CAUTION: Do not maintain wide open throttle (WOT) in any range for more than 5 seconds. Failure to follow this instruction may result in transmission damage.

CAUTION: If the engine rpm recorded by the scan tool exceeds maximum specified rpm, release the accelerator pedal immediately. Failure to follow this instruction may result in transmission damage. Clutch or band slippage is indicated.

NOTE: The Stall Speed Test should be carried out with the engine and transmission at normal operating temperatures.

NOTE: Prolonged use of this procedure may set DTC P0712 or P1783. After carrying out Stall Speed Test, run OBD Test and clear DTCs from memory.

1. Connect a scan tool to the vehicle.
2. Press the accelerator pedal to the floor (WOT) in each range. Record rpm reached in each range. Stall speeds should be as follows:

Stall Speed Diagnosis Chart:

If the stall speeds were too high, refer to the following Stall Speed Diagnosis Chart. If the stall speeds were too low, first check the engine idle speed. If engine idle is OK, remove the transmission and replace the torque converter.

Stall Speed Chart: