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Check The Mass Air Flow Sensor Unit

WARNING: This page is about a different car, the 2013 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect the battery positive terminal to terminal No. 3 and the battery ground terminal to terminal No. 4, the circuit tester positive terminal to terminal No. 5 and the circuit tester ground terminal to terminal No. 4.
    Fig 1: Checking Mass Air Flow Sensor Unit
    G08538768Courtesy of SUBARU OF AMERICA, INC.
  2. Check the voltage changes when air is blown to the mass air flow sensor unit in arrow direction.
    Fig 2: Locating Mass Air Flow Sensor Unit
    G08538769Courtesy of SUBARU OF AMERICA, INC.
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