Line Pressure Test
WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
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 WOT in any transmission range for more than 5 seconds.
This test verifies the line pressure is within specification.
- Connect the Transmission Fluid Pressure Gauge 307-004 (T57L-77820-A) to the line pressure tap.
- Start the engine and check the line pressure. Refer to Pressure Chart below to determine if the line pressure is within specification.PRESSURE SPECIFICATIONS
Gear Line Pressure at Idle KPa (psi) Line Pressure at WOT Stall KPa (psi) Minimum Maximum Minimum Maximum P 338 kPa (49 psi) 379 kPa (55 psi) - - R 621 kPa (90 psi) 689 kPa (100 psi) 1, 868 kPa (271 psi) 2, 068 kPa (300 psi) N 338 kPa (49 psi) 379 kPa (55 psi) - - D 517 kPa (75 psi) 586 kPa (85 psi) 1, 868 kPa (271 psi) 2, 068 kPa (300 psi) - If the line pressure is not within specification, see the Line Pressure Diagnosis Chart for line pressure concern causes.
- When the pressure tests are complete, install the line pressure tap plug.
- Tighten to 12 Nm (106 lb-in).
LINE PRESSURE DIAGNOSIS DESCRIPTION
| Test Results | Possible Source |
|---|---|
| HIGH at IDLE - ALL RANGES | Wiring Harness |
| PCA | |
| Main Regulator Valve | |
| LOW at IDLE - ALL RANGES | Low Transmission Fluid |
| Fluid Inlet Filter/Seal | |
| Main Control Valve Body | |
| Cross Leaks | |
| Gaskets | |
| Pump | |
| Separator Plate | |
| LOW in Park ONLY | Main Control Valve Body |
| LOW in Reverse ONLY Separator Plate | |
| Reverse Clutch | |
| Main Control Valve Body | |
| Forward Clutch | |
| LOW in Neutral ONLY Main Control Valve Body | |
| LOW in Drive O/D ONLY | Forward Clutch |
| Main Control Valve Body | |
| LOW in Manual Low ONLY | Forward Clutch |
| Main Control Valve Body |