Ground Circuits
WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
- Using DVOM, check for continuity to ground at PCM ground terminals. For connector terminal identification, see Figure -Figure . See WIRING DIAGRAMS . Resistance should be less than 5 ohms. If resistance is not less than 5 ohms, repair open in ground circuit.
- 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.