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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 terminals. See IDENTIFYING PCM GROUND TERMINALS  table. See Figure or 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
    Blackwood, Expedition, Explorer, Explorer Sport, Explorer Sport Trac, F150 Pickup, Mountaineer & Navigator Right Rear Of Engine Compartment, Mounted On Cowl
    Continental, Escape, Ranger & Town Car Center Of Engine Compartment, Mounted On Cowl
    Cougar, LS, Sable, Taurus, Thunderbird & Windstar Right Rear 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 & F250-550 Behind Left Side Of Instrument Panel, Near Brake Pedal
    Focus & Mustang Behind Right Kick Panel
    IDENTIFYING PCM GROUND TERMINALS

    Application PCM Ground Terminal No.
    Blackwood 3, 25, 51, 76 & 103
    Continental, Crown Victoria, F150 Pickup (Lightning 5.4L SC), Grand Marquis, Mustang (4.6L) & Town Car 3, 51, 77 & 103
    Cougar 24, 25, 51, 77 & 103
    Econoline
    4.2L 24, 51, 76, 77 & 103
    4.6L & 5.4L Gas 3, 24, 51, 76, 77 & 103
    5.4L NGV 3, 24, 25, 51, 77 & 103
    6.8L 3, 23, 24, 51, 76, 77 & 103
    Escape 24, 25, 51, 76, 77 & 103
    Escort & Focus (2.0L) 24, 51, 77 & 103
    Excursion & F250-F550 (5.4L & 6.8L) 3, 23, 24, 51, 76, 77 & 103
    Expedition & Navigator (4.6L & 5.4L Gas), F150 Pickup (4.6L & 5.4L, & 5.4L NGV), & Mustang (3.8L) 3, 51, 76 & 103
    Explorer Sport, Explorer Sport Trac & F150 Pickup (4.2L) 24, 51, 76, 77 & 103
    Explorer, LS, Mountaineer & Thunderbird A24, A25, A26, A27 & A43
    Ranger, Sable, Taurus & Windstar 24, 25, 51, 76, 77 & 103
  2. Touch DVOM negative lead to a good ground. With vehicle running, use DVOM positive lead to backprobe each ground terminal. DVOM should indicate less than one volt. If reading is more than one volt, check for open, corrosion or loose connection on ground circuit.
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