Line Pressure Test

Courtesy of FORD MOTOR COMPANY

This test verifies the line pressure is within specification.

1. Remove the 2 bolts and position the air cleaner top assembly aside.
2. Remove the air cleaner bottom assembly.
3. Connect the air cleaner bottom assembly to the air cleaner top assembly.
4. Connect the transmission fluid pressure gauge (307-004) to the line pressure tap.
5. NOTE: Some transmission calibrations may maximize line pressure (300 PSI (2068 kPa)) during warmup. Commanding LINEDSD# may have minimal effect.

   Start the engine, allow TFT to reach normal operating temperature (if possible) and check the line pressure.

6. Using a diagnostic scan tool, monitor and compare the PID LINEDSD# to actual measured pressure. Actual measured pressure should be within 10 PSI (69 kPa) of PID LINEDSD#. Raise engine RPM to 2000 RPM and verify LPC operation by monitoring LINE pressure while commanding LINEDSD# up and down.
7. If the line pressure is not within specification, see the Line Pressure Diagnosis Chart for possible source.
8. When the pressure tests are complete, install the line pressure tap plug.
   • Torque: 14 Nm (124 lb-in).

9. Disconnect the air cleaner bottom assembly from the air cleaner top assembly.
10. Install the air cleaner bottom assembly.
11. Reposition the air cleaner top assembly and install the 2 bolts.
    • Torque: 5 Nm (44 lb-in).

Line Pressure Diagnosis Chart