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Home >> Subaru >> 2018 >> Outback 2.5i >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control/Fuel System (H4DO) >> Mass Air Flow And Intake Air Temperature Sensor >> Inspection >> Check The Mass Air Flow Sensor Unit
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Check The Mass Air Flow Sensor Unit

  1. Connect the battery positive terminal to terminal No. 3 and the battery ground terminal to terminal No. 4, and connect the circuit tester positive terminal to terminal No. 5 and the circuit tester ground terminal to terminal No. 4.
    G08315415Courtesy of SUBARU OF AMERICA, INC.
  2. Check the voltage changes when air is blown to the mass air flow sensor unit in arrow direction.
    G08315416Courtesy of SUBARU OF AMERICA, INC.
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