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Home >> Subaru >> 1989 >> RX Automatic >> Repair and Diagnosis >> Engine Performance >> System >> System/Component Tests >> Idle Control System >> Auxiliary Air Valve (MPFI 1.8L)
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Auxiliary Air Valve (MPFI 1.8L)

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