LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1997 >> Forward Control 7.4 J >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Engine Controls - System/Component Tests - 4.3L.) >> Computerized Engine Controls >> Control Unit >> Ground Circuits
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Ground Circuits

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 1995 GMC Vandura, 1995 GMC Sonoma, 1995 GMC Safari, 1995 GMC Rally, and 1995 GMC Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using an ohmmeter, check for continuity to ground on ECM/PCM/VCM ground terminals. Resistance should be zero ohms. If not, repair open to ground.
  2. Using a DVOM, touch negative lead of voltmeter to a good ground. Touch positive lead of voltmeter to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If voltmeter reading is greater than one volt, check for open, corrosion or loose connection on ground circuit.
scientia non olet · About LEMON Manuals