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Home >> Subaru >> 1994 >> Justy DL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Auxiliary Air Valve
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Auxiliary Air Valve

  1. 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.
  2. 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.
  3. 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.
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