Ground Circuits
- Using an ohmmeter, check for continuity to ground on PCM ground terminals. Use appropriate wiring diagram in the WIRING DIAGRAMS article to determine PCM ground terminals. Resistance to ground should be zero ohms. If reading is other than zero ohms, repair open to circuit ground.
- Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is one volt or more, check for open, corroded or loose connection on ground lead.