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Home >> Subaru >> 2018 >> WRX Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Fuel Injection System (STI)) >> 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

WARNING: This page is about a different variant/trim than selected.
  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.
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  2. Check the voltage changes when air is blown to the mass air flow sensor unit in arrow direction.
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