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Home >> Subaru >> 2013 >> Forester X Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Fuel Injection System (H4DOTC)) >> Mass Air Flow and Intake Air Temperature Sensor >> Inspection >> Check Mass Air Flow Sensor Unit

Check Mass Air Flow Sensor Unit

WARNING: This page is about a different variant/trim than selected.
  1. Connect battery positive terminal to terminal No. 3 and battery ground terminal to terminal No. 4, and circuit tester positive terminal to terminal No. 5 and circuit tester negative terminal to terminal No. 4.
    Fig 1: Checking Mass Air Flow Sensor Unit
    G06344673Courtesy of SUBARU OF AMERICA, INC.
  2. Check that the voltage changes when air is blown to the mass air flow sensor unit from arrow direction.
    Fig 2: Locating Mass Air Flow Sensor Unit Air Blown Direction
    G06344674Courtesy of SUBARU OF AMERICA, INC.
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