LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2003 >> Regal LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - 3.8L >> Computerized Engine Controls >> Powertrain Control Module >> Ground Circuits
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Ground Circuits

  1. Using DVOM, check for continuity to ground at PCM ground terminals. For connector terminal identification, see CONNECTOR IDENTIFICATION in SELF-DIAGNOSTICS - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL article. See WIRING DIAGRAMS . 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.
scientia non olet · About LEMON Manuals