Stall Speed Test

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

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

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. Line Pressure Test

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

1. Connect a tachometer to the engine.

2. CAUTION: After testing each of these ranges D, 3, 2, 1 and R, move the transmission range selector lever to N and run the engine at 1,000 rpm for about 15 seconds to allow the torque converter to cool before testing the next range.

CAUTION: Do not maintain wide open throttle (WOT) in any range for more than 5 seconds.

CAUTION: If the engine rpm recorded by the tachometer exceeds maximum specified rpm, release the accelerator pedal immediately. Clutch or band slippage is indicated.

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

Press the accelerator pedal to the floor WOT in each range. Record rpm reached in each range. Stall speeds should be as listed:

Stall Speed Chart:

If the stall speeds were too high, refer to the Stall Speed Diagnosis Chart. If the stall speeds were too low, first check the engine idle speed. If the engine idle is OK, remove the torque converter and check the torque converter one-way clutch for slippage.

Stall Speed Diagnosis Chart: