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.
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HOMESERVICE MANUALSFORD1999TAURUS V6-3.0L DOHC VIN SREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSPOWER STEERING PRESSURE SWITCHDESCRIPTION AND OPERATION
1999 Ford Taurus V6-3.0L DOHC VIN S
Power Steering Pressure Switch: Description and Operation
1999 Ford Taurus V6-3.0L DOHC VIN SSECTION Description and Operation
A Power Steering Pressure (PSP) switch
- is located on the power steering pressure hose.
- sends a signal to the ride control module (RCM) to increase idle speed for engine stability when power steering pump pressure increases above a set pressure value.
The (PSP) switch uses an O-ring seal. If a leak occurs at the PSP switch, check that the PSP switch is properly tightened to 7 - 14 Nm (62 - 123 inch lbs.). If the leak continues, replace the O-ring seal and tighten to 7 - 14 Nm (62 - 123 inch lbs.).
Check operation of the PSP switch if either or both of the following concerns are noted:
- Engine stalls during parking maneuvers.
- Engine idles at high rpm.
The following test is based on the fact that the PSP switch is normally closed. As power steering load increases, the PSP switch opens and increases the idle speed.
1. Disconnect the electrical connector at the power steering pressure switch (PSP switch)
2. Connect the Rotunda 73 Digital Multimeter 105-R0051 or equivalent, across the power steering pressure (PSP) switch terminals.
3. Start engine and let idle.
4. PSP switch should be normally closed (zero ohms) with steering wheel straight ahead.
5. Turn steering toward either stop while watching the multimeter. PSP switch should open near the stops (no continuity or infinite reading on ohmmeter).
6. If PSP switch fails either test, replace the PSP switch. If PSP switch is OK, check the engine idle speed control system.
- is located on the power steering pressure hose.
- sends a signal to the ride control module (RCM) to increase idle speed for engine stability when power steering pump pressure increases above a set pressure value.
The (PSP) switch uses an O-ring seal. If a leak occurs at the PSP switch, check that the PSP switch is properly tightened to 7 - 14 Nm (62 - 123 inch lbs.). If the leak continues, replace the O-ring seal and tighten to 7 - 14 Nm (62 - 123 inch lbs.).
Check operation of the PSP switch if either or both of the following concerns are noted:
- Engine stalls during parking maneuvers.
- Engine idles at high rpm.
The following test is based on the fact that the PSP switch is normally closed. As power steering load increases, the PSP switch opens and increases the idle speed.
1. Disconnect the electrical connector at the power steering pressure switch (PSP switch)
2. Connect the Rotunda 73 Digital Multimeter 105-R0051 or equivalent, across the power steering pressure (PSP) switch terminals.
3. Start engine and let idle.
4. PSP switch should be normally closed (zero ohms) with steering wheel straight ahead.
5. Turn steering toward either stop while watching the multimeter. PSP switch should open near the stops (no continuity or infinite reading on ohmmeter).
6. If PSP switch fails either test, replace the PSP switch. If PSP switch is OK, check the engine idle speed control system.
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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.