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Ground Circuits

  1. Using a DVOM, check for continuity to ground at the following Powertrain Control Module (PCM) connector terminals. See IDENTIFYING POWERTRAIN CONTROL MODULE PWR GND TERMINALS  table. See Figure . If continuity does not exist, repair open ground circuit as necessary. If continuity exists, go to next step.
    IDENTIFYING POWERTRAIN CONTROL MODULE PWR GND TERMINALS

    Application PCM Harness Connector Terminal No.
    All Others 24, 51, 76, 77 & 103
    Contour & Mystique, & Escort & Tracer (1.9L) 24, 51, 77 & 103
  2. Touch negative lead of DVOM to a good ground. With vehicle running, backprobe positive lead of DVOM 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 lead.
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