Continental V8-4.6L DOHC (1995)
Power Steering Pressure Switch: Testing and Inspection
Component Tests
The Power Steering Pressure (PSP) switch uses an O-ring seal. If a leak occurs, ensure the power steering pressure switch is tightened to 7-14 Nm (5-10
lb ft). If the leak continues, replace the O-rings, then the power steering pressure switch.
The power steering pressure switch has a diaphragm which can rupture and cause a leak through the switch body. If this condition is observed, replace
the power steering pressure switch.
Check operation of the power steering pressure switch if either or both of the following concerns are noted:
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Engine stalls during parking maneuvers.
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Engine idles at high speed.
The following test is based on the fact that the power steering pressure switch is normally closed. As power steering load increases, the power steering
pressure switch opens and increases the idle speed.
1. Disconnect electrical connector at power steering pressure switch.
2. Connect a continuity tester, Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent, across power steering pressure switch terminals.
3. Start engine and let idle.
4. Power steering pressure switch should be normally closed (zero ohms) with steering wheel straight ahead.
5. Turn steering toward either stop while watching continuity tester. Power steering pressure switch should open near the stops (no continuity or
infinite reading on ohmmeter).
6. If power steering pressure switch fails either test, replace power steering pressure switch. If power steering pressure switch is OK, check engine
idle speed control system. Refer to Testing and Inspection Pinpoint testing procedures, located in the system level.
