Ground Circuits
- Turn ignition off. Check resistance between chassis ground and PCM/ECM ground terminals. See PCM/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 PCM/ECM and ground.
- Connect voltmeter negative lead to chassis ground. Connect positive lead to each ECM ground terminal. See PCM/ECM GROUND TERMINAL IDENTIFICATION table. With engine running, voltmeter should indicate less than one volt. If voltmeter indicates greater than one volt, check for open, corrosion or loose connection in ground circuit.
PCM/ECM GROUND TERMINAL IDENTIFICATION
| Application |
PCM/ECM Connector Terminals No. (Wire Color) |
| Accent |
3, 51, 53, 61, 78 & 80 (BLK) |
| Elantra |
1 & 2 (BLK) |
| Santa Fe (2.4L) |
| C21-2 (A/T) |
2 & 8 (BLK) |
| C22-1 (M/T) |
13 & 26 (BLK) |
| C22-4 (M/T) |
21 (BLK) |
| Santa Fe (2.7L) |
| C23-1 |
4, 5 & 6 (BLK) |
| C23-5 |
5 (BLK) |
| Santa Fe (3.5L) |
|
| 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) |
| Tiburon (2.0L) |
6, 28, 34 & 55 (BLK) |
| Tiburon (2.7L) |
| C133-1 |
4, 5 & 6 (BLK) |
| C133-5 |
5 (BLK) |
| XG350 (3.5L) |
| C44-2 |
2 & 8 (BLK) |
| C44-3 |
6 & 27 (BLK/WHT) |