Ford F-150 2002 - Stall Speed Test

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3. If the line pressure is not within specifications, carry out On-Board Diagnostics and GO to Pinpoint Test D, air pressure check, and clean, inspect and install a

new main control system or pump as required.

Line Pressure Chart

Line Pressure Diagnosis Chart

Stall Speed Test

WARNING: Apply the service and parking brakes firmly while carrying out each stall test.

CAUTION: Carry out the Line Pressure Test 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 transmission damage will occur.

NOTE: If the Transmission Tester is installed, it must be removed prior to carrying out the test.

NOTE: The stall test should only be carried out with the engine and transmission at normal operating temperatures.

The stall test checks the operation of the following items:

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Torque converter one-way clutch.

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Forward clutch.

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Low one-way clutch.

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Reverse clutch.

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Overdrive one-way clutch.

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Direct clutch.

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Driveability concerns.

1. Connect a tachometer to the engine.

2. After testing each of the following ranges, (D), 2, 1 and R, move the transmission range selector lever to N (NEUTRAL) and run the engine for about 15 seconds

to allow the torque converter to cool before testing the next range.

3. CAUTION: If the engine rpm recorded by the tachometer exceeds the maximum specified rpm, release the accelerator pedal immediately. Clutch

or band slippage is indicated.

CAUTION: Do not maintain wide-open throttle (WOT) in any gear range for more than 5 seconds or transmission damage may occur.

Press the accelerator pedal to floor (WOT) in each range. Record the rpm reached in each range. Stall speeds should be in the appropriate range.

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, check engine tune-up. If the engine is OK, remove

the torque converter and check the torque converter reactor one-way clutch for slippage.

Gear

Line Pressure — Idle Line Pressure — Stall

kPa psi kPa psi

P, N 345-448 50-65 — —

R 483-690 70-100 1,689-2,000 245-290

(D),2 345-448 50-65 1,138-1,276 165-185

1 483-690 70-100 1,207-1,448 175-210

Low at Idle in All Ranges High at Idle in All Ranges

Check for low fluid level, restricted inlet filter, loose main body, solenoid body or

accumulator body-to-case bolts, excessive leakage in pump, case, control bodies,

sticking main regulator valve, damaged filter assembly and seal, damaged gaskets