Power Circuits (Cranking)
- Using voltmeter, backprobe appropriate ECU terminal. See ECU POWER TERMINAL IDENTIFICATION table. Hold ignition switch in START position. Battery voltage should exist between ECU terminal and ground only when ignition switch is in START position.
- If battery voltage does not exist, check fusible link. Fusible links are in engine compartment. If fusible link is okay, check for open wire between fusible link and ECU terminal, or for defective ignition switch. See WIRING DIAGRAMS article.
ECU POWER TERMINAL IDENTIFICATION
| Terminal No. | Ignition Switch Position | Wire Color | |
|---|---|---|---|
| Impreza | |||
| Terminal A26 | Off | Yellow/Red | |
| Terminal A10 | On | Yellow | |
| Terminal A13 | On | Yellow/Green | |
| Terminal A12 | Cranking | Red/Yellow | |
| Justy | |||
| Terminal A2 | Ignition Off | White/Blue | |
| Terminal A1 | Ignition On | Red | |
| Terminal A12 | Ignition On | Red | |
| Terminal A17 | Cranking | Black/White | |
| Legacy | |||
| Terminal A15 | Ignition Off | Yellow/Red | |
| Terminal A2 | Ignition On | Yellow/Red | |
| Terminal A13 | Ignition On | Yellow/Red | |
| Terminal B12 | Ignition On | Yellow | |
| Terminal B10 | Cranking | Light Green/Yellow | |
| Loyale | |||
| Terminal B27 | Ignition Off | Black/White | |
| Terminal B29 | Ignition On | White | |
| Terminal B38 | Ignition On | Red/Blue | |
| Terminal B41 | Ignition On | White | |
| Terminal C49 | Ignition On | Red/Blue | |
| Terminal A18 | Cranking | Lt. Green/Yellow | |
| SVX | |||
| Terminal A2 | Ignition On | White/Red | |
| Terminal A13 | Ignition On | White/Red | |