Diagnostic Aids

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:

Electronic shift control module and mechanical 4WD LOW wiring harness circuit (4WD LOW). See Fig 1 and Fig 2 .
Powertrain Control Module (PCM).

NOTE: Electronic shift control module is also referred to as Generic Electronic Module (GEM).

Fig 1: Identifying Electronic Shift Control Module Circuit (Electronic Shift)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying 4WD LOW Circuit & 4x4L Switch Connector Terminals (Mechanical Shift)

Courtesy of FORD MOTOR CO.

4-WHEEL DRIVE SHIFT CONTROL MODULE

Application	Location
Explorer & Mountaineer	Under Passenger's Side Of Dash, Near Center Console
Expedition & Navigator	Under Driver's Side Dash, Near Left Kick Panel
F150 Pickup	Under Driver's Side Of Dash, Near Steering Column
Ranger	Behind Right Kick Panel