Ground Circuits
- Measure resistance to ground on ECM terminals A23, A24, A26, and B2. Resistance should be zero ohms. If not, repair open to ground.
- Using a DVOM, connect negative lead to a good ground. Backprobe each ground terminal. With engine running, DVOM should indicate less than one volt. If voltmeter reading is greater than one volt, check for open, corrosion, or loose connection on ground lead.