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Home >> GMC >> 1998 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 58 (Engine Controls - System & Component Testing - 5.7L) >> Computerized Engine Controls >> Control Unit >> Ground Circuits
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Ground Circuits

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1998 GMC Yukon, 1998 GMC Suburban, 1998 GMC Pickup, 1998 GMC Cab & Chassis, and 1998 Chevrolet Tahoe. 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 PCM/VCM ground terminals. See POWERTRAIN CONTROL MODULE (PCM)  table. Resistance should be zero ohms. If not, repair open to ground.
  2. Connect negative lead of a voltmeter to a good ground. Backprobe positive lead of voltmeter to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If voltmeter reading is more than one volt, check for open, short to voltage, corrosion or loose connection on ground circuit.
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