Ground Circuits
- Turn ignition off. Check resistance between chassis ground and ECM ground terminals. See ECM GROUND TERMINAL IDENTIFICATION table. If less than 2 ohms exists, go to next step. If more than 2 ohms exists, repair wire(s) between ECM and ground.
- Connect voltmeter negative lead to chassis ground. Connect positive lead to each ECM ground terminal. See ECM GROUND TERMINAL IDENTIFICATION table. With engine running, voltmeter should indicate less than one volt. If voltmeter reading is greater than one volt, check for open, corrosion or loose connection in ground circuit.
ECM GROUND TERMINAL IDENTIFICATION
| Application |
ECM Connector Terminals No. (Wire Color) |
| Accent |
3, 51, 53, 61, 78 & 80 (BLK) |
| Elantra & Tiburon |
6, 28, 34 & 55 (BLK) |
| Sonata (2.4L) |
| C44-2 (A/T) |
2 & 8 (BLK) |
| C45-1 (M/T) |
13 & 26 (BLK) |
| C45-4 (M/T) |
21 (BLK) |
| Sonata (2.5L) |
| C94-1 |
4, 5 & 6 (BLK) |
| C94-5 |
5 (BLK) |