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

WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator. 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 SERVICE INFORMATION FOR IMPROTANT 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: Identifying 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.

Powertrain Control Module (PCM) Connector

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

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR PINS REFERENCE CHART

Vehicle	Connector	Pin	Circuit
Focus, Transit Connect	190-PIN	B41	SIGRTN-PSP
Fusion, MKZ	140 PIN	E65	PSPSW
All other vehicles	170 PIN	B34	PSPSW

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

Courtesy of FORD MOTOR CO.