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 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. 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 part 419-03 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: Positive Crankcase Ventilation Thermal Extension -Harness Side (PCVTE-Harness Side)

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

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Crown Victoria, 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 Wiring Diagrams article for schematic and connector information.

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

Vehicle	Connector	Pin	Circuit
Edge, MKX	190 Pin	B17	PSPSW
Explorer, Explorer Sport Trac, Mountaineer	170 Pin	B41 B27	SIGRTN PSPSW
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
Sable, Taurus, Taurus X	190 Pin	E41 B17	SIGRTN PSPSW
All other vehicles	170 Pin	E58 B34	SIGRTN PSPSW

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

Courtesy of FORD MOTOR CO.