Line Pressure Diagnosis Chart
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
LINE PRESSURE DIAGNOSIS CHART
| Test Results | Possible Source |
|---|---|
| High At Idle - In All Positions | Wiring Harnesses |
| Run Quick Test. Refer to the INTRODUCTION - GASOLINE article | |
| EPC Solenoid | |
| Main Regulator Valve | |
| Low At Idle - In All Positions | Low Fluid Level |
| Control Bodies | |
| Leakage in Pump | |
| Damaged Gaskets on Separator Valve | |
| Damaged Separator Plate | |
| Restricted Inlet Filter | |
| Case Bolts | |
| Loose Main Control Valve Body | |
| EPC Solenoid O-Ring | |
| EPC Solenoid Bracket | |
| Case | |
| Sticking Main Regulator Valve | |
| Damaged Inlet Tube Seal on Inlet Filter | |
| Low In Park Only | Valve Body |
| Low/Reverse Servo | |
| Low In Reverse Only | Separator Plate |
| Low/Reverse Servo or Valve Bodies | |
| Reverse Clutch | |
| Low In Neutral Only | Valve Body |
| Low In Overdrive Only | Forward Clutch |
| Valve Body | |
| Low In 1st Position Only | Forward Clutch |
| Valve Body | |
| Low/Reverse Servo | |
| Low In 2nd Only | Intermediate Clutch |
| Valve Bodies | |
| Forward Clutch |