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Ground Circuits

  1. Using DVOM, check for continuity to ground at PCM ground terminals. For connector terminal identification, see appropriate SELF-DIAGNOSTICS article. See WIRING DIAGRAMS article. Resistance should be less than 5 ohms. If resistance is not less than 5 ohms, repair open in ground circuit.
  2. Connect negative lead of DVOM to a known-good ground. Backprobe positive lead of voltmeter to each PCM ground terminal. With vehicle running, DVOM should indicate less than one volt. If DVOM reading is greater than one volt, check for open, short to voltage, corrosion or loose connection in ground circuit.
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