Ground Circuits
- Using an ohmmeter, check for continuity to ground on ECU ground terminals. See ECU GROUND CIRCUITS table. Resistance should be zero ohms. If not, repair open ground circuit.
- Using a DVOM, touch negative lead of voltmeter to a good ground. Touch positive lead of voltmeter to each ground terminal. See ECU GROUND CIRCUITS table. With vehicle running, voltmeter reading should be less than .1 volt. If voltmeter reading is greater than .1 volt, check for open, corrosion or loose connection on ground lead.
ECU GROUND CIRCUITS
| Application | ECU Terminals |
|---|---|
| 4.0L | B-11 & B-12 |