Pinpoint Test TG: 4x4 Low Switch (4X4LSW) And Four Wheel Drive (4WD) Switch: Introduction: Notes

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: This pinpoint test is intended to diagnose the following:

Harness circuits between the PCM and Electronic Shift Control Module.
Harness circuit for mechanical 4x4L.
Powertrain control module (PCM) (12A650).

Fig 1: Identifying 4x4 Low Switch (4X4LSW) Connector

Courtesy of FORD MOTOR CO.

Fig 2: Identifying Generic Electronic Module (GEM) Connector

Courtesy of FORD MOTOR CO.

Fig 3: Identifying 4x4 Control Module (4x4CM) Connector

Courtesy of FORD MOTOR CO.