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Air Control Valve

  1. Disconnect air hose from air control valve lower connection (outlet). Start and run engine at idle. Place finger over air control valve outlet and make sure that air is flowing out of outlet. If not, replace air control valve.
  2. Now, disconnect vacuum sensing tube (hose leading to intake manifold from diaphragm unit) from air control valve. Plug hose. See Fig 1.
  3. With engine still running at idle, check for air flow from air control valve outlet (hose still disconnected). No air should be flowing from outlet. If it does, replace air control valve and repeat test.
  4. Next, disconnect vacuum sensing tube from top connection on air control valve. Reconnect vacuum tube to diaphragm unit.
  5. There should now be excessive flow from air control valve lower outlet (hose still disconnected). If not, replace air control valve and repeat test.
Fig 1: Testing Air Control Valve
G09309985Courtesy of MAZDA MOTORS CORP.
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