Pinpoint Test Ff: Power Steering Pressure (PSP) Switch: Introduction

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2009 Mercury Mountaineer, 2009 Mercury Milan, 2009 Mercury Mariner, 2009 Mercury Grand Marquis, and 2009 Lincoln Town Car. 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 ARTICLE . FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.

This pinpoint test is intended to diagnose the following:

power steering pressure (PSP) switch (3N824)
harness circuits: PSPSW 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 the appropriate SYSTEM WIRING DIAGRAMS article for schematic and connector information.

For PCM connector views or reference values, refer to REFERENCE VALUES .

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR

Vehicle	Connector	Pin	Circuit
Crown Victoria, Grand Marquis, Mustang, Town Car	170 Pin	E58 B34	SIGRTN PSPSW
Edge, MKX	190-Pin	B17	PSPSW
Expedition, Navigator	190-Pin	B15	PSPSW
Explorer, Explorer Sport Trac, Mountaineer	170 Pin	B41 B27	SIGRTN PSPSW
F-150	190-Pin	B58	SIGRTN
Fusion 3.0L, Milan 3.0L	140 Pin	E58 E65	SIGRTN PSPSW
Fusion 2.3L, Milan 2.3L, MKZ	140 Pin	E65	PSPSW
Ranger	170 Pin	B41 B34	SIGRTN PSPSW
All other vehicles	190-Pin	E41 B17	SIGRTN PSPSW

Fig 2: Shorting Bar For Harness Circuit Without PSP Switch (Typical)

Courtesy of FORD MOTOR CO.