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Ground Circuits

  1. Using a DVOM, check for continuity to ground at PCM connector terminals No. 24, 51, 77 and 103. See Figure . Resistance should be approximately zero ohms. If resistance is not approximately zero ohms, repair circuit open to ground.
  2. Touch negative lead of voltmeter to a good ground. With vehicle running, backprobe positive lead of voltmeter to each ground terminal. Voltmeter 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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