Ground Circuits
- Turn ignition off. Using DVOM in ohmmeter mode, backprobe each ECU ground terminal. See ECU GROUND TERMINAL IDENTIFICATION table. Resistance should be zero ohms. If resistance is not close to zero ohms, repair open to ground.
- Start engine. With DVOM in voltmeter mode, backprobe each ground terminal. Voltage should be less than one volt. If voltage is greater than one volt, check for open, corrosion, or loose connection on ground lead.
ECU GROUND TERMINAL IDENTIFICATION
| Application | Wire Color |
|---|---|
| 25 | Red/Yellow |
| 45 | Black/Red |
| 46 | Black/Red |
| 69 | Black |
| 70 | Black/White |
| 71 | Black/Yellow |
| 72 | Black/Yellow |
| 95 | Black/White |
| 96 | Black/White |