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 MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 116 (ENGINE CONTROLS - THEORY & OPERATION - EEC-IV 4.6L)COMPUTERIZED ENGINE CONTROLSINPUT DEVICESPOWER STEERING PRESSURE (PSP) SWITCH
1991 Mercury Tracer Base, 4D Sedan, Automatic
Power Steering Pressure (PSP) Switch
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Power Steering Pressure (PSP) Switch
WARNING: This page is about a different car, the 1994 Mercury Grand Marquis, 1994 Lincoln Town Car, 1994 Lincoln Mark VIII, and 1994 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
PSP switch monitors power steering pressure. Switch is normally closed and opens when pressure increases. The PCM uses PSP signal to adjust idle speed to compensate for additional load on engine.
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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.