Ground Circuits
- Using DVOM, check for continuity to ground at PCM ground terminals. See POWERTRAIN CONTROL MODULE CONNECTOR TERMINAL IDENTIFICATION . See Figure . Resistance should be zero ohms. If resistance is not zero ohms, repair open in ground circuit.
- Connect negative lead to a known-good ground. Backprobe positive lead to each PCM ground terminal. With vehicle running, DVOM should indicate less than one volt. If DVOM indicates more than one volt, check for open, short to voltage, corrosion or loose connection in ground circuit. If DVOM indicates less than one volt, see POWER CIRCUITS .