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 PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMBY-PASS AIR CONTROL VALVE
1994 Subaru Legacy L, 4D Sedan, FWD, Standard
By-Pass Air Control Valve
1994 Subaru Legacy L, 4D Sedan, FWD, StandardSECTION By-Pass Air Control Valve
- Turn ignition off. Unplug by-pass air control valve harness connector. By-pass air control valve is located near throttle body. Measure resistance between valve terminals No. 1 (White wire on mating connector) and No. 2 (Yellow/Red wire on mating connector). Resistance should be 9 ohms.
- Measure resistance between terminals No. 2 (Yellow/Red wire on mating connector) and No. 3 (Black wire on mating connector). Resistance should be 9 ohms. If resistance is not as specified, replace by-pass air control valve. See appropriate SELF-DIAGNOSTICS article for more detailed test procedures.
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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.