PINPOINT TEST FF: Power Steering Pressure (PSP) Switch: Introduction

WARNING: Crown Victoria Police Interceptor vehicles equipped with fire suppression system, refer to FIRE SUPPRESSION SYSTEM 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 switch (3N824)
harness circuits: PSPSW and SIGRTN
powertrain control module (PCM) (12A650)

Fig 1: Power Steering Pressure (PSP) Switch Connector - A

Courtesy of FORD MOTOR CO.

Fig 2: Power Steering Pressure (PSP) Switch Connector - B

Courtesy of FORD MOTOR CO.

Fig 3: Power Steering Pressure (PSP) Switch Connector - C

Vehicle	Connector	Pin	Circuit
Crown Victoria, Escape, Fusion 3.0L, Grand Marquis, Milan 3.0L, Town Car	A	2 1	SIGRTN PSPSW
Edge, Fusion 2.3L, Milan 2.3L, MKX, MKZ	B	1	PSPSW
Ranger	C	2 1	SIGRTN PSPSW
All other vehicles	C	1 2	SIGRTN PSPSW

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.

Powertrain Control Module (PCM) Connector

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

Vehicle	Connector	Pin	Circuit
Edge, MKX	190 Pin	B17	PSPSW
Escape, Mariner	150 (50-50-50) Pin	B41 B3	SIGRTN PSPSW
Explorer, Explorer Sport Trac, Mountaineer	170 Pin	B41 B27	SIGRTN PSPSW
Five Hundred, Freestyle, Montego	150 (50-50-50) Pin	E41 B34	SIGRTN PSPSW
Freestar/Monterey	104 Pin	91 31	SIGRTN PSPSW
Fusion 2.3L, Milan 2.3L	140 Pin	E65	PSPSW
Fusion 3.0L, Milan 3.0L, MKZ	140 Pin	E58 E65	SIGRTN PSPSW
Ranger	170 Pin	B41 B34	SIGRTN PSPSW
All other vehicles	170 Pin	E58 B34	SIGRTN PSPSW

Fig 4: Shorting Bar For Harness Circuit Without PSP Switch (Typical)