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Ground Circuits

  1. Turn ignition off. Locate Powertrain Control Module (PCM). See POWERTRAIN CONTROL MODULE LOCATION  table. Using a DVOM, check continuity between ground and PCM connector pins. See IDENTIFYING PCM GROUND PINS  table. See Figure and Figure . If continuity does not exist, repair open ground circuit as necessary. If continuity exists, go to next step.
    POWERTRAIN CONTROL MODULE LOCATION

    Application Location
    Cougar, LS, Sable, Taurus & Windstar Right Rear Of Engine Compartment, Mounted On Cowl
    Continental, Escape, Ranger & Town Car Center Of Engine Compartment, Mounted On Cowl
    Crown Victoria & Grand Marquis Behind Left Kick Panel, Near Instrument Panel
    Econoline Left Rear Of Engine Compartment, Near Brake Master Cylinder
    Escort Center Of Instrument Panel, Below Center Console
    Excursion & F250/350 Super-Duty Pickups Behind Left Side Of Instrument Panel, Near Brake Pedal
    Expedition, Explorer, Explorer Sport, Explorer Sport Trac, F150 Pickup, Mountaineer & Navigator Right Rear Of Engine Compartment, Mounted On Cowl
    Focus & Mustang Behind Right Kick Panel
    IDENTIFYING PCM GROUND PINS

    Application PCM Ground Pin No.
    Continental, Crown Victoria, Grand Marquis & Town Car 3, 25, 51, 77 & 103
    Cougar 24, 51, 77 & 103
    Econoline
    4.2L 24, 25, 51, 76, 77 & 103
    4.6L & 5.4L 3, 24, 25, 51, 76, 77 & 103
    6.8L 3, 23, 24, 25, 33, 51, 76, 77 & 103
    Escape
    Duratec 3, 24, 25, 51, 76 &103
    Zetec 23, 24, 25, 33, 51, 76, 77 &103
    Escort & Escort ZX 24, 33, 51, 77 & 103
    Expedition & Navigator 3, 25, 51, 76 & 103
    Excursion
    5.4L 3, 23, 24, 25, 51, 76, 77 & 104
    6.8L 3, 23, 24, 25, 51, 76, 77 & 103
    Explorer & Mountaineer 24, 25, 51, 76, 77 & 103
    Focus 24, 25, 51, 77 &103
    LS 24, 25, 26, 27 & 43,
    Mustang 3, 51, 76, 77 & 103
    Pickup
    F150
    4.2L 24, 51, 76, 77 & 103
    4.6L & 5.4L 3, 51, 76, & 103
    F250/F350 Super Duty
    5.4L 3, 23, 24, 25, 51, 76, 77 & 104
    6.8L 3, 23, 24, 25, 51, 76, 77 & 103
    Ranger, Sable & Taurus 24, 25, 51, 76, 77 & 103
    Windstar 24, 51, 76, 77 & 103
  2. Touch DVOM negative lead to a good ground. With vehicle running, backprobe DVOM positive lead to each ground terminal. DVOM should indicate less than one volt. If reading is greater than one volt, check for open, corrosion or loose connection on ground circuit.
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