Stall Speed Test

The Stall Speed Test checks the operation of the following items:

• Torque converter one-way clutch
• Forward clutch
• Low/reverse one-way clutch
• Reverse clutch
• Forward one-way clutch
• Engine 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.
CAUTION: Carry out Line Pressure Test before carrying out the stall test. If line pressure is low at stall, do not carry out stall test or further transaxle damage may occur.
NOTE: The stall test should only be carried out with the engine and transaxle at normal operating temperatures.
1. Connect a tachometer to the engine.
CAUTION: Do not maintain wide open throttle (WOT) in any gear range for more than 5 seconds.
CAUTION: If engine RPM recorded by the tachometer exceeds maximum specified RPM, release accelerator pedal immediately. Clutch or band slippage is indicated.
2. Press accelerator pedal to floor (WOT) in each range. Record RPM reached in each range. Stall speeds should be in appropriate range.

After testing DRIVE (D) and REVERSE (R), move transaxle range selector lever to NEUTRAL (N) and run engine for about 15 seconds to allow torque converter to cool before testing next range.

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