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Home >> Subaru >> 2018 >> Forester 2.5i, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control/Fuel Injection 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, the circuit tester positive terminal to terminal No. 5 and the circuit tester ground terminal to terminal No. 4.
    G12505382Courtesy of SUBARU OF AMERICA, INC.
  2. Check the voltage changes when air is blown from the arrow pointing area to the mass air flow sensor unit.
    G12505383Courtesy of SUBARU OF AMERICA, INC.
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