Pinpoint Test FF: Power Steering Pressure (PSP) Switch: Introduction: Notes

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: CROWN VICTORIA POLICE INTERCEPTOR VEHICLES EQUIPPED WITH FIRE SUPPRESSION SYSTEM, REFER TO FIRE SUPPRESSION SYSTEM FOR IMPORTANT SAFETY WARNINGS. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.

This pinpoint test is intended to diagnose the following:

Power steering pressure switch (3N824).
Harness circuits: PSP and SIGRTN.
Powertrain control module (PCM) (12A650).

Fig 1: Power Steering Pressure (PSP) Switch Connector
Courtesy of FORD MOTOR CO.

The PSP and SIGRTN circuits may be reversed in the harness connector. Refer to SYSTEM WIRING DIAGRAMS for more information.