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)GROUND CIRCUITS
1994 Subaru Legacy L, 4D Sedan, FWD, Standard
Ground Circuits
1994 Subaru Legacy L, 4D Sedan, FWD, StandardSECTION 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 |
|---|---|
| Terminal A11 | Black/Red |
| Terminal A21 | Red/Green |
| Terminal A22 | Black/Red |
| Terminal D14 | Black/White |
| Terminal D15 | Black |
| Terminal D24 | Black/Yellow |
| Terminal D25 | Black/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.