Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Line Pressure Diagnosis Chart
2005 Ford Taurus SEL, 4D SedanSECTION 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 |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.