Line Pressure Test

Courtesy of FORD MOTOR COMPANY

This test verifies the line pressure is within specification.

1. Remove the air cleaner. REFER to: Air Cleaner .
2. Connect the transmission fluid pressure gauge (307-004) to the line pressure tap.
3. Install the air cleaner. REFER to: Air Cleaner .
4. NOTE: Some transmission calibrations may maximize line pressure (300 PSI (2068 kPa)) during warm-up. Commanding LINEDSD# may have minimal effect.

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

5. 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.
6. If the line pressure is not within specification, see the Line Pressure Diagnosis Chart for possible source.
7. Remove the air cleaner. REFER to: Air Cleaner .
8. When the pressure tests are complete, install the line pressure tap plug.
   • Torque: 12 Nm (106 lb-in).

9. Install the air cleaner. REFER to: Air Cleaner .

Line Pressure Diagnosis Chart