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Line Pressure Test

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Line Pressure Tap
G06599445Courtesy of FORD MOTOR CO.
Item 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. If line pressure is low, 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 input sensor failures may cause high line pressure and Failure Mode Effect Management actions. Make sure that the On-Board Diagnostic (OBD) test and electrical repairs have been carried out or test results may be incorrect.

This test verifies the line pressure is within specifications.

  1. Connect the Transmission Fluid Pressure Gauge to the line pressure tap.
  2. 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.
  3. Check line pressure at WOT stall speed with the selector lever in all gear ranges. Slowly press the accelerator pedal to WOT and record the pressure reading. After recording the pressure reading, slowly release the accelerator pedal until closed throttle is obtained (idle). Refer to the following Pressure Charts  to determine if the line pressure is within specification.
  4. If pressure is not within specification, refer to the Line Pressure Diagnostic Chart  for further diagnosis.
  5. When the line pressure test is completed, install the line pressure tap plug.
    • Tighten to 12 Nm (106 lb-in).
NOTE: Actual and commanded pressures vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
PRESSURE CHART A

Gear Line Pressure - kPa (psi) Commanded - PCA pressure kPa (psi) (1)
Idle WOT Stall Idle WOT Stall
P, N 413 (60) - 248 (36) -
R 655 (95) 1, 585 (230) 413 (60) 1, 068 (155)
(D) 455 (66) 1, 241 (180) 276 (40) 827 (120)
3 530 (77) 1, 241 (180) 331 (48) 862 (125)
2 545 (79) 758 (110) 345 (50) 689 (100)
1 413 (60) 1, 275 (185) 248 (36) 862 (125)
(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.
PRESSURE CHART B

Gear Commanded - SSPCA pressure kPa (psi) (1) Commanded - SSPCB pressure kPa (psi)(1)
Idle WOT Stall Idle WOT Stall
P, N 0 - 0 -
R 689 (100) 1, 655 (240) 0 0
(D) 0 0 0 0
3 572 (83) 1, 331 (193) 0 0
2 0 0 586 (85) 1, 103 (160)
1 448 (65) 1, 331 (193) 0 0
(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.
PRESSURE CHART C

Gear Commanded - SSPCC pressure kPa (psi) (1) Commanded - SSPCD pressure kPa (psi)(1)
Idle WOT Stall Idle WOT Stall
P, N 0 - 0 -
R 0 0 0 (2) 0 (2)
(D) 0 0 0 0
3 572 (83) 1, 310 (190) 0 0
2 0 0 0 0
1 0 0 0 0
(1) Commanded pressure as viewed on diagnostic equipment.
(2) Shift solenoid pressure control D commanded pressure as viewed on diagnostic equipment will be zero. The manual valve controls pressure to the direct clutch in the R detent position.
NOTE: Actual and commanded pressures vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
PRESSURE CHART D

Gear Commanded - SSPCE pressure kPa (psi) (1)
Idle WOT Stall
P, N 1, 034 (150) -
R 1, 186 (172) 2, 068 (300)
(D) 207 (30) 0
3 0 0
2 1, 103 (160) 1, 620 (235)
1 965 (140) 1, 862 (270)
(1) Commanded pressure as viewed on diagnostic equipment.
LINE PRESSURE DIAGNOSTIC CHART

Test Results Possible Source
High line pressure at idle all ranges
  • Wiring harness (external or internal)
  • Pressure Control Solenoid A (PCA)
  • Main regulator valve in pump stuck
Low line pressure at idle all ranges
  • PCA concerns
  • Low transmission fluid level
  • Blown out solenoid gasket filter
  • Line pressure blow off valve stuck open (on solenoid body assembly)
  • Cross leaks due to loose bolts on the solenoid body
  • Restricted or damage sump filter
  • Sticking pump regulator valve
Low line pressure in M1 and M3 only
  • Wiring harness (external or internal)
  • Shift Solenoid Pressure Control A (SSPCA)
  • Coast clutch assembly
Low line pressure in M2 only
  • Wiring harness (external or internal)
  • Shift Solenoid Pressure Control B (SSPCB)
  • Overdrive clutch assembly
Low line pressure in M3 only
  • Wiring harness (external or internal)
  • Shift Solenoid Pressure Control C (SSPCC)
  • Intermediate clutch assembly
Low line pressure in R only
  • Wiring harness (external or internal)
  • Shift Solenoid Pressure Control D (SSPCD)
  • Direct clutch assembly
  • Shift Solenoid Pressure Control E (SSPCE)
  • Low/reverse clutch assembly
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