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Ground Circuits

  1. Turn ignition off. Locate Powertrain Control Module (PCM). See POWERTRAIN CONTROL MODULE LOCATION  table. Disconnect PCM 104-pin harness connector. Using a DVOM, check continuity between ground and PCM connector terminals. See IDENTIFYING PCM GROUND TERMINALS  table. See Figure -Figure . If continuity is present, go to next step. If continuity is not present, repair open ground circuit as necessary.
    POWERTRAIN CONTROL MODULE LOCATION

    Application Location
    All Models Center Of Engine Compartment, Mounted In Firewall
    IDENTIFYING PCM GROUND TERMINALS

    Application PCM Ground Pin No.
    Except Tribute 24, 25, 51, 76, 77 & 103
    Tribute
    2.0L 23, 24, 25, 33, 51, 76, 77 & 103
    3.0L 3, 24, 25, 51, 76 & 103
  2. Connect DVOM negative lead to a good ground. With vehicle running, backprobe DVOM positive lead to each PCM ground terminal. DVOM should indicate less than one volt. If reading is greater than one volt, check for open, corrosion or loose connection in ground circuit.
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