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Line Pressure Test

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Carry out Line Pressure Test prior to carrying out 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 gear range for more than five seconds.
NOTE: Certain sensor failures may cause high PC, FMEM (Failure Mode Effect Management) actions. Be sure that self test and electrical repairs have been carried out, or test results may be incorrect.
NOTE: The line pressure tap is used to verify output pressure from PC A or PC B by turning either one off while verifying the output from the other solenoid. The second pressure tap is used to verify the output from the PC C solenoid.

This test verifies that the line pressure is within specifications.

  1. Connect pressure gauge to the line pressure tap.
    Fig 1: Identifying Line Pressure Tap
    G03201626Courtesy of FORD MOTOR CO.
  2. Start engine and check line pressures. Refer to the following Line Pressure Specification Chart to determine if line pressure is within specifications. See LINE PRESSURE SPECIFICATION CHART - 3.0L ENGINE  or LINE PRESSURE SPECIFICATION CHART - 3.9L ENGINE .
    LINE PRESSURE SPECIFICATION CHART - 3.0L ENGINE

    Range Idle Pressure WOT Stall Pressure
    PCC Line PCC Line
    P/N 0-69 kPa (0-10 psi) 758-827 kPa (110-120 psi) 0-69 kPa (0-10 psi) 758-827 kPa (110-120 psi)
    R 345-414 kPa (50-60 psi) 896-965 kPa (130-140 psi) 2,151-2,289 kPa (312-332 psi) 2,172-2,310 kPa (315-335 psi)
    D5 0-69 kPa (0-10 psi) 827-896 kPa (120-130 psi) 0-69 kPa (0-10 psi) 1,517-1,586 kPa (220-230 psi)
    D4 0-69 kPa (0-10 psi) 827-896 kPa (120-130 psi) 0-69 kPa (0-10 psi) 1,551-1,620 kPa (225-235 psi)
    M5/M4 0-69 kPa (0-10 psi) 827-896 kPa (120-130 psi) 0-69 kPa (0-10 psi) 1,551-1,620 kPa (225-235 psi)
    M3 0-69 kPa (0-10 psi) 827-896 kPa (120-130 psi) 0-69 kPa (0-10 psi) 1,551-1,620 kPa (225-235 psi)
    M2/M1 0-69 kPa (0-10 psi) 827-896 kPa (120-130 psi) 0-69 kPa (0-10 psi) 1,551-1,620 kPa (225-235 psi)
    LINE PRESSURE SPECIFICATION CHART - 3.9L ENGINE

    Range Idle Pressure WOT Stall Pressure
    PCC Line PCC Line
    P/N 0-69 kPa (0-10 psi) 483-620 kPa (70-90 psi) 0-69 kPa (0-10 psi) 483-620 kPa (70-90 psi)
    R 345-414 kPa (50-60 psi) 689-827 kPa (100-120 psi) 2,151-2,289 kPa (312-332 psi) 2,151-2,289 kPa (312-332 psi)
    D5 0-69 kPa (0-10 psi) 689-827 kPa (100-120 psi) 0-69 kPa (0-10 psi) 1,482-1,620 kPa (215-235 psi)
    D4 0-69 kPa (0-10 psi) 689-827 kPa (100-120 psi) 0-69 kPa (0-10 psi) 1,482-1,620 kPa (215-235 psi)
    M5/M4 0-69 kPa (0-10 psi) 689-827 kPa (100-120 psi) 0-69 kPa (0-10 psi) 1,482-1,620 kPa (215-235 psi)
    M3 0-69 kPa (0-10 psi) 689-827 kPa (100-120 psi) 0-69 kPa (0-10 psi) 1,482-1,620 kPa (215-235 psi)
    M2/M1 0-69 kPa (0-10 psi) 689-827 kPa (100-120 psi) 0-69 kPa (0-10 psi) 1,482-1,620 kPa (215-235 psi)
  3. If line pressure is not within specifications, check PC C pressure.
  4. Connect Pressure Gauge to PC C pressure tap.
    Fig 2: Identifying PC C Pressure Tap
    G03201627Courtesy of FORD MOTOR CO.
  5. Start engine and check PC C pressure. Refer to LINE PRESSURE DIAGNOSIS CHART  in this section for specification.
  6. If PC C pressure is not within specification, Go To PINPOINT TEST D: PRESSURE CONTROL (PC) SOLENOIDS (PCA, PCB, PCC)  to diagnose PC C operation. If PC C operation is OK, refer to LINE PRESSURE DIAGNOSIS CHART  in this section for line pressure concern causes.
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