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Power Steering Pressure Switch

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2002 Mercury Sable, 2002 Mercury Mountaineer, 2002 Mercury Grand Marquis, 2002 Mercury Cougar, and 2002 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Power Steering Pressure (PSP) switch monitors power steering pressure. PSP switch is normally closed and opens as pressure increases. PCM uses PSP switch input signal to compensate for additional loads on engine by adjusting idle speed RPM, and prevents engine stall during parking maneuvers. PCM also uses PSP signal to adjust transaxle/transmission Electronic Pressure Control (EPC) pressure during increased engine load.

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