Line Pressure Test: Notes
WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
ITEM DESCRIPTION CHART
| Item | Part Number | Description |
|---|---|---|
| 1 | - | Line pressure tap |
WARNING:
Block all wheels, set the parking brake and firmly apply the service brake to reduce the risk of vehicle movement during this procedure. Failure to follow these instructions may result in serious personal injury.
NOTE:
Carry out the Line Pressure Test prior to carrying out the Stall Speed Test. Refer to SPECIAL TESTING PROCEDURES . If line pressure is low at stall, do not carry out the Stall Speed Test or additional transmission damage will occur. Do not maintain Wide Open Throttle (WOT) in any transmission range for more than 5 seconds or transmission damage may occur.
NOTE:
Certain sensor failures may cause high control pressure and Failure Mode Effect Management actions. Make sure that On-Board Diagnostic (OBD) and electrical repairs have been carried out or test results may be incorrect.
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 at idle speeds with the transmission in each gear range. Refer to the following PRESSURE CHARTS to determine if the line pressure is within specification.
- Check line pressure at Wide Open Throttle (WOT) stall speed with the selector lever in all gear ranges. Slowly press the throttle to WOT and record the pressure reading. After recording the pressure reading, slowly release the throttle until closed throttle is obtained (idle). Refer to the following PRESSURE CHART charts to determine if the line pressure is within specification.
- If pressure is not within specification, refer to the LINE PRESSURE DIAGNOSTIC CHART for further diagnosis.
- When the line pressure test is completed, install the line pressure tap plug.
- Tighten to 12 Nm (106 lb-in).
NOTE:
Do not immediately press the throttle to the floor or allow the throttle to immediately close or internal damage to the engine or transmission will occur.