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

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2010 Mercury Milan, 2010 Mercury Mariner, 2010 Mercury Grand Marquis, 2010 Lincoln Town Car, and 2010 Lincoln Navigator L. 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 APPROPRIATE FIRE SUPRESSIN ARTICLE 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 (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 PIN REFERENCE CHART

Vehicle	Connector	Pin	Circuit
Edge, MKX	190-Pin	B17	PSPSW
Explorer, Explorer SportTrac, Mountaineer	170 Pin	B41 B27	SIGRTN PSPSW
F-150	190-Pin	B58	SIGRTN
Flex, MKS, MKT, Taurus	190-Pin	E41	SIGRTN
Fusion, MKZ	140 Pin	E65	PSPSW
Ranger	170 Pin	B41 B34	SIGRTN PSPSW
All other vehicles	170 Pin	E58 B34	SIGRTN PSPSW

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

Courtesy of FORD MOTOR CO.