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Line Pressure Test: Notes

The line pressure test verifies that the line pressure is within specifications.

CAUTION: Carry out line pressure test before carrying out stall speed test. If line pressure is low at stall, do not carry out stall speed test or further transaxle damage will occur. Do not maintain WOT in any gear range for more than five seconds.
CAUTION: Transmission tester must be removed from the transaxle and the vehicle harness connected to verify these pressures.
  1. Connect pressure gauge to line pressure tap.
    Fig 1: Identifying Line Pressure Tap
    G02205253Courtesy of FORD MOTOR CO.
  2. Start engine and check line pressures. Refer to Fig 2 to determine if line pressure is within specifications.
  3. If line pressure is not within specifications, carry out on-board diagnostics and pinpoint test, air pressure check and repair main control system or pump as required.
Fig 2: Line Pressure Chart
G02205254Courtesy of FORD MOTOR CO.