Stall Speed Test
WARNING: This page is about a different car, the 2003 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
This test checks 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 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 transaxle damage will occur.
NOTE:
The Stall Speed Test should be carried out with the engine and transaxle at normal operating temperatures.
- Connect tachometer to the engine.
- Press accelerator pedal to floor (WOT) in each range. Record RPM reached in each range. Stall speeds should be as indicated. See Fig 1.
- If stall speeds were too high, refer to the STALL SPEED DIAGNOSIS CHART. See Fig 2. 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 one way clutch for slippage.
CAUTION:
After testing each of the following ranges D, 2, 1, and R, move the selector lever to N (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.
CAUTION:
Do not maintain wide open throttle 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 Stall Speed Test, run OBD Test and clear DTCs from memory.