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Mass Air Flow Meter: Inspection

  1. INSPECT INTAKE AIR FLOW METER 
    1. Check the output voltage.
      1. Apply battery voltage across terminals 1 (+B) and 2 (EVG).
      2. Using a voltmeter, connect the positive (+) tester probe to terminal 3 (VG), and negative (-) tester probe to terminal 2 (EVG).
      3. Blow air into the MAF meter, and check that the voltage fluctuates.
    2. Measure the resistance between terminals 4 (THA) and 5 (ETHA).
      Fig 1: Measuring Resistance Between Terminals
      G04027182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      SPECIFIED CONDITION CHART

      Condition Specified Condition
      -20°C (-4°F) 13.6 to 18.4 kΩ
      20°C (68°F) 2.21 to 2.69 kΩ
      60°C (140°F) 0.493 to 0.667 kΩ

      If the result is not as specified, replace the MAF meter.

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