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Ground Circuits

  1. Measure resistance to ground at appropriate PCM ground terminals. See POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION  table. Resistance should be zero ohms for each circuit. If resistance is not zero ohms, repair open to ground.
  2. To check voltage drop on ground circuit, connect negative lead of DVOM to a good ground. Connect positive lead to each ground terminal. With engine running, voltmeter should indicate less than 0.1 volt. If voltage is more than 0.1 volt, check for open, corrosion, or loose connection on ground lead. See WIRING DIAGRAMS article.
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