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 MANUALSLINCOLN1996CONTINENTAL V8-4.6L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSPOWER STEERING PRESSURE SWITCHTESTING AND INSPECTIONOPERATION TEST
1996 Lincoln Continental V8-4.6L DOHC
Operation Test
1996 Lincoln Continental V8-4.6L DOHCSECTION Operation Test
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:
- Engine stalls during parking maneuvers.
- 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.
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:
- Engine stalls during parking maneuvers.
- 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.
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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.