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Mass Air Flow Meter: Inspection

  1. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY 
    1. Perform a visual check for any foreign matter on the platinum hot wire (heater) of the mass air flow meter shown in the illustration.

      OK: 

      There is no foreign material. 

      Fig 1: Identifying Mass Air Flow Meter Sub-Assembly
      G05997187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the intake air temperature sensor (built into the mass air flow meter).
      1. Measure the resistance according to the value (s) in the table below.

        Standard Resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Condition Specified Condition
        1 (THA) - 2 (E2) -20°C (-4°F) 13.6 to 18.4 kΩ
        1 (THA) - 2 (E2) 20°C (68°F) 2.21 to 2.69 kΩ
        1(THA) - 2 (E2) 60°C (140°F) 0.49 to 0.67 kΩ

        If the result is not as specified, replace the mass air flow meter sub-assembly.

        Fig 2: Identifying Mass Air Flow Meter Sub-Assembly Connector Terminals
        G05997188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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