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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Fuel Injection System (H4DO)) >> Mass Air Flow and Intake Air Temperature Sensor >> Inspection >> Check The Mass Air Flow Sensor Unit

Check The Mass Air Flow Sensor Unit

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  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: Connecting Battery Positive Terminal 3 And Battery Ground Terminal 4
    G08315415Courtesy 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.
Fig 2: Locating Mass Air Flow Sensor Unit Pointing Area
G08315416Courtesy of SUBARU OF AMERICA, INC.