Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU1994LEGACY L, 4D SEDAN, FWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSELECTRONIC CONTROL UNIT (ECU)POWER CIRCUITS (CRANKING)
1994 Subaru Legacy L, 4D Sedan, FWD, Standard
Power Circuits (Cranking)
1994 Subaru Legacy L, 4D Sedan, FWD, StandardSECTION 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
| Application | Wire Color | |
|---|---|---|
| Ignition Off | ||
| Terminal A15 | Yellow/Red | |
| Ignition On | ||
| Terminal A2 | Yellow/Red | |
| Terminal A13 | Yellow/Red | |
| Terminal B12 | Yellow | |
| Cranking | ||
| Terminal B10 | Light Green/Yellow | |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.