Stall Speed Test: Notes
This test checks the operation of the following items:
- torque converter clutch
- forward clutch
- low one way clutch assembly
- engine performance
WARNING:
Apply the parking brake firmly while carrying out each stall test.
CAUTION:
Always carry out the LINE PRESSURE TEST before carrying out the Stall Speed Test. If the line pressure is low at stall, do not carry out the Stall Speed Test or further transaxle damage will occur.
NOTE:
The Stall Speed Test should be carried out with the engine and transaxle at normal operating temperatures.
- Connect a tachometer to the engine.
- Press the accelerator pedal to the floor, WOT in each range. Record the RPM reached in each range. Stall speeds should be as shown. See STALL SPEED 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 torque converter and check the torque converter one way clutch for slippage.
CAUTION:
After testing each of the following ranges D, 2, 1, and R, move the selector lever to the "N" (NEUTRAL) position and run the engine at 1000 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 five 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 P0712, P1783. After carrying out the Stall Speed Test run the OBD Test and clear the DTCs from the memory.