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Line Pressure Tap Plug

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Locating Line Pressure Tap Plug
G07482762Courtesy of FORD MOTOR CO.
NOTE: Carry out the LINE PRESSURE TEST  prior to carrying out the STALL SPEED TEST . If the 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 (WOT) in any transmission range for more than 5 seconds.

This test verifies that the line pressure is within specification.

    NOTE: The line pressure tap is an M10 X 1.00 thread. Do not use a National Pipe Thread (NPT) fitting when installing a pressure gauge. If a NPT fitting is used, damage to the transmission case will occur.
  1. Connect the Transmission Fluid Pressure Gauge to the line pressure tap using an M10 X 1.00 fitting.
  2. Start the engine and check the line pressures. Refer to the Line Pressure Chart  to determine if the line pressure is within specification.
    NOTE: Actual and commanded pressures vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
    LINE PRESSURE CHART - DIESEL ENGINES

    Gear Line Pressure - kPa (psi) Commanded - LPC pressure kPa (psi) (1)
    Idle WOT Stall Idle WOT Stall
    P, N 619 (90) - 94 (14) -
    R 619 (90) 1, 790 (260) 94 (14) 480 (70)
    (D) 619 (90) 1, 550 (225) 94 (14) 375 (55)
    3 619 (90) 1, 100 (160) 94 (14) 240 (35)
    2 619 (90) 1, 650 (235) 94 (14) 410 (60)
    1 619 (90) 1, 550 (225) 94 (14) 375 (55)
    (1) Commanded pressure as viewed on diagnostic equipment.
    NOTE: Actual and commanded pressures vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
    LINE PRESSURE CHART - GAS ENGINES

    Gear Line Pressure - kPa (psi) Commanded - LPC pressure kPa (psi) (1)
    Idle WOT Stall Idle WOT Stall
    P, N 619 (90) - 94 (14) -
    R 619 (90) 1, 675 (240) 94 (14) 410 (60)
    (D) 619 (90) 1, 600 (230) 94 (14) 375 (55)
    3 619 (90) 1, 230 (180) 94 (14) 275 (40)
    2 619 (90) 1, 675 (240) 94 (14) 410 (60)
    1 619 (90) 1, 600 (230) 94 (14) 375 (55)
    (1) Commanded pressure as viewed on diagnostic equipment.
  3. If the line pressure is not within specification, refer to the Line Pressure Diagnosis Chart .
  4. When the pressure tests are complete, install the line pressure tap plug.
    • Tighten to 11 Nm (97 lb-in).
LINE PRESSURE DIAGNOSIS CHART

Test Results Possible Source
HIGH at IDLE - ALL RANGES Wiring Harnesses Line Pressure Control (LPC) Solenoid LPC Valve
LOW at IDLE - ALL RANGES Low Fluid Level Fluid Inlet Filter/Seal Main Control Cross Leaks Gaskets Pump Separator Plate
LOW in Park ONLY Main Control
LOW in Reverse ONLY Separator Plate Reverse Clutch Valve Body Forward Clutch
LOW in Neutral ONLY Main Control
LOW in DRIVE ONLY Low/Reverse (1, R) Clutch Forward (1, 2, 3, 4) Clutch Main Control
LOW in Manual 2nd ONLY Forward (1, 2, 3, 4) Clutch Intermediate (2, 6) Clutch Main Control
LOW in Manual 1st ONLY Low/Reverse (1, R) Clutch Forward (1, 2, 3, 4) Clutch Main Control
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