Line Pressure Test

WARNING: This page is about a different car, the 2003 Ford RV Cutaway, 2003 Ford Econoline, 2003 Ford E550 Super Duty, 2003 Ford E450 Super Duty, and 2003 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Line Pressure Tap

Courtesy of FORD MOTOR CO.

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. Do not maintain wide-open throttle in any transmission range for more than 5 seconds or transmission damage may occur.

NOTE: Carry out shift linkage check prior to carrying out this test; refer to TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS .

This test verifies the line pressure is within specifications.

Connect the Transmission Fluid Pressure Gauge to the line pressure tap.
Start the engine and check the line pressures. Refer to the LINE PRESSURE CHART to determine if the line pressure is within specification.
If the line pressure is not within specifications, carry out On-Board Diagnostics and GO to PINPOINT TEST E , air pressure check, and clean, inspect and install a new main control system or pump as required.