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Home >> Subaru >> 1992 >> Justy Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Idle Control System >> Auxiliary Air Valve (Justy PFI & Loyale)

Auxiliary Air Valve (Justy PFI & Loyale)

  1. With engine running, pinch hose between Auxiliary Air Valve (AAV) and intake manifold. Engine speed should drop about 100 RPM with engine warm and more with engine cold. Release hose. Ensure engine returns to previous speed.
  2. If RPM is not as specified, turn ignition off. Check AAV resistance. If reading is either zero or infinity, replace AAV. Check AAV solenoid for any short to ground. If short is present, replace solenoid.
  3. Check for voltage at harness connector. Ensure 12 volts are available at Blue wire of AAV electrical connector. If 12 volts are not available, check main relay, fuses and power source.
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