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 102 (ENGINE CONTROLS - THEORY & OPERATION 4.6L)COMPUTERIZED ENGINE CONTROLSINPUT DEVICESPOWER STEERING PRESSURE (PSP) SENSOR
1991 Mercury Tracer Base, 4D Sedan, Automatic
Power Steering Pressure (PSP) Sensor
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Power Steering Pressure (PSP) Sensor
WARNING: This page is about a different car, the 1995 Lincoln Mark VIII. However, it is still accessible from the selected car via links, so may be relevant.
PSP sensor monitors for increase in hydraulic pressure, indicating an engine load at idle. PCM uses PSP sensor signal to increase idle speed to prevent engine stall during parking maneuvers.
RENDER: 1.0x
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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.