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.
1994 Subaru Justy DLFACTORY OEM SERVICE PROCEDURE
Auxiliary Air Valve
- With engine running, pinch hose between Auxiliary Air Valve (AAV) and intake manifold. AAV is located near throttle body. Engine speed should drop about 100 RPM with engine warm, and more with engine cold. Release hose. Check that engine returns to previous speed.
- If RPM is not as specified, turn ignition off. Check AAV resistance. If resistance is either zero or infinity, replace AAV. Check AAV solenoid for short to ground. If short exists, replace solenoid.
- Check for battery voltage at harness connector at Blue wire of AAV electrical connector. If battery voltage does not exist, check main relay, fuses, and power source.
Factory Service Tools
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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.
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