Line Pressure Test
WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Part Number | Description |
|---|---|---|
| 1 | - | Line pressure tap |
NOTE:
Carry out the Line Pressure Test prior to carrying out the Stall Speed Test. 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:
Apply the park brake and block drive wheels during the line pressure test. Vehicle movement during the test may cause personal injury or damage to the vehicle and equipment.
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.
NOTE:
Actual and commanded pressures will vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
PRESSURE CHART A - DIESEL
| Gear | Line Pressure - kPa (psi) | Commanded (a) - PCA pressure kPa (psi) | ||
|---|---|---|---|---|
| Idle | WOT Stall | Idle | WOT Stall | |
| P, N | 344 (50) | - | 172 (25) | - |
| R | 689 (100) | 2,206 (320) | 413 (60) | 1,407 (204) |
| Overdrive (Circle D) | 483 (70) | 2,206 (320) | 276 (40) | 1,379 (200) |
| 3 | 551 (80) | 1,793 (260) | 331 (48) | 1,172 (170) |
| 2 | 551 (80) | 1,482 (215) | 338 (49) | 952 (138) |
| 1 | 551 (80) | 1,861 (270) | 338 (49) | 1,213 (176) |
| (a) = Commanded pressure as viewed on diagnostic equipment. | ||||
NOTE:
Actual and commanded pressures will vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
PRESSURE CHART B - DIESEL
| Gear | Commanded (a) - SSPCA pressure kPa (psi) | Commanded (a) - SSPCB pressure kPa (psi) | ||
|---|---|---|---|---|
| Idle | WOT Stall | Idle | WOT Stall | |
| P, N | 0 | - | 0 | - |
| R | 758 (110) | 2,068 (300) | 0 | 0 |
| Overdrive (Circle D) | 0 | 0 | 0 | 0 |
| 3 | 572 (83) | 1,765 (256) | 0 | 0 |
| 2 | 0 | 0 | 586 (85) | 1,461 (212) |
| 1 | 572 (83) | 1,765 (256) | 0 | 0 |
| (a) = Commanded pressure as viewed on diagnostic equipment. | ||||
NOTE:
Actual and commanded pressures will vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
PRESSURE CHART C - DIESEL
| Gear | Commanded (a) - SSPCC pressure kPa (psi) | Commanded (a) - SSPCD pressure kPa (psi) | ||
|---|---|---|---|---|
| Idle | WOT Stall | Idle | WOT Stall | |
| P, N | 0 | - | 0 | - |
| R | 0 | 0 | 0 (b) | 0 (b) |
| Overdrive (Circle D) | 0 | 0 | 0 | 0 |
| 3 | 572 (83) | 1,765 (256) | 0 | 0 |
| 2 | 0 | 0 | 0 | 0 |
| 1 | 0 | 0 | 0 | 0 |
| (a) = Commanded pressure as viewed on diagnostic equipment. (b) = Shift Solenoid Pressure Control D (SSPCD) commanded pressure as viewed on diagnostic equipment will be zero. The manual valve controls pressure to the direct clutch in the R detent position. To confirm the presence of the direct clutch pressure monitor the pressure switch PS-D, PS-D should be open in the R position. |
||||
NOTE:
Actual and commanded pressures will vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
PRESSURE CHART D - DIESEL
| Gear | Commanded (a) - SSPCE pressure kPa (psi) | |
|---|---|---|
| Idle | WOT Stall | |
| P, N | 207 (30) | - |
| R | 758 (110) | 0 |
| Overdrive (Circle D) | 207 (30) | 0 |
| 3 | 0 | 0 |
| 2 | 586 (85) | 1,461 (212) |
| 1 | 572 (83) | 1,765 (256) |
| (a) = Commanded pressure as viewed on diagnostic equipment. | ||
NOTE:
Actual and commanded pressures will vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
PRESSURE CHART A - GASOLINE
| Gear | Line Pressure - kPa (psi) | Commanded (a) - PCA pressure kPa (psi) | ||
|---|---|---|---|---|
| Idle | WOT Stall | Idle | WOT Stall | |
| P, N | 413 (60) | - | 248 (36) | - |
| R | 655 (95) | 1,585 (230) | 413 (60) | 1,068 (155) |
| Overdrive (Circle 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) |
| (a) = Commanded pressure as viewed on diagnostic equipment. | ||||
NOTE:
Actual and commanded pressures will vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
PRESSURE CHART B - GASOLINE
| Gear | Commanded (a) - SSPCA pressure kPa (psi) | Commanded (a) - SSPCB pressure kPa (psi) | ||
|---|---|---|---|---|
| Idle | WOT Stall | Idle | WOT Stall | |
| P, N | 0 | - | 0 | - |
| R | 689 (100) | 1,655 (240) | 0 | 0 |
| Overdrive (Circle 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 |
| (a) = Commanded pressure as viewed on diagnostic equipment. | ||||
NOTE:
Actual and commanded pressures will vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
PRESSURE CHART C - GASOLINE
| Gear | Commanded (a) - SSPCC pressure kPa (psi) | Commanded (a) - SSPCD pressure kPa (psi) | ||
|---|---|---|---|---|
| Idle | WOT Stall | Idle | WOT Stall | |
| P, N | 0 | - | 0 | - |
| R | 0 | 0 | 0 (b) | 0 (b) |
| Overdrive (Circle D) | 0 | 0 | 0 | 0 |
| 3 | 572 (83) | 1,310 (190) | 0 | 0 |
| 2 | 0 | 0 | 0 | 0 |
| 1 | 0 | 0 | 0 | 0 |
| (a) = Commanded pressure as viewed on diagnostic equipment. (b) = SSPCD 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 will vary based on calibration and transmission adaptive strategies. All pressures listed are approximate.
PRESSURE CHART D - GASOLINE
| Gear | Commanded (a) - SSPCE pressure kPa (psi) | |
|---|---|---|
| Idle | WOT Stall | |
| P, N | 1,034 (150) | - |
| R | 1,186 (172) | 2,068 (300) |
| Overdrive (Circle D) | 207 (30) | 0 |
| 3 | 0 | 0 |
| 2 | 1,103 (160) | 1,620 (235) |
| 1 | 965 (140) | 1,862 (270) |
| (a) = Commanded pressure as viewed on diagnostic equipment. | ||
LINE PRESSURE DIAGNOSTIC CHART
| Test Results | Possible Source |
|---|---|
| High line pressure at idle all ranges |
|
| Low line pressure at idle all ranges |
|
| Low coast clutch pressure |
|
| Low Overdrive (O/D) clutch pressure |
|
| Low intermediate clutch pressure |
|
| Low direct clutch pressure |
|
| Low low/reverse clutch pressure |
|