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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 651 (Automatic Transaxle/Transmission - FNR5) >> Diagnosis And Testing >> Special Testing Procedures >> Stall Speed Test

Stall Speed Test

WARNING: This page is about a different car, the 2006 Mercury Milan and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

This test checks operation of the following items:

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.
  1. Connect tachometer to the engine.
    2. CAUTION: After testing each of the following ranges D, L 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 (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 P0712, P1783. After carrying out Stall Speed Test, run OBD Test and clear DTCs from memory.
  2. Press accelerator pedal to floor (WOT) in each range. Record rpm reached in each range. Stall speeds should be as follows:
    STALL SPEED CHART

    Engine RPM
    All 2,200-2,700
  3. If stall speeds were too high, refer to the following 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 one way clutch for slippage.
STALL SPEED DIAGNOSIS CHART

Transaxle Range Selector Lever Position Possible Cause
Above specification in D and L Forward clutch slipping.
Above specification in L Intermediate/overdrive band slipping.
Above specification in L and R Low/reverse clutch slipping.
Above specification in R Reverse clutch slipping.
Above specification in R Carry out road test to determine whether problem is in low/reverse clutch.
Above specification in R Low/reverse clutch is defective.
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