Stall Speed Test

5R44E And 5R55E

Special Testing Procedures

Stall Speed Test

This test checks operation of the following items:

- Torque Converter Clutch (TCC)
- Forward clutch
- Low One-Way Clutch (OWC) assembly
- Driveability concerns

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.

NOTICE: Always carry out Line Pressure Test procedures prior to carrying out the Stall Speed Test. If line pressure is low at stall, do not carry out 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 scan tool.

2. NOTICE: After testing each of the following ranges (D), 2, 1 and R, move the selector lever to N (NEUTRAL) and run engine at 1,000 rpm for about 15 seconds to allow the torque converter to cool before testing the next range or damage to the torque converter may occur.

NOTICE: Do not maintain Wide Open Throttle (WOT) in any range for more than 5 seconds or damage to the engine may occur.

NOTICE: 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 DTCs P0712 and P1783. After carrying out Stall Speed Test, run On-Board Diagnostic (OBD) Test and clear the DTCs from memory.

Press accelerator pedal to Wide Open Throttle (WOT) in each range. Record rpm reached in each range. Stall speeds should be as follows:

Stall Speed Chart





If stall speeds were too high, see the Stall Speed Diagnosis Chart. If stall speeds were too low, first check the engine idle speed. If engine idle is OK, remove torque converter and check the Torque Converter Clutch (TCC) for slippage.

Stall Speed Diagnosis Chart