2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

Mass Air Flow Meter: Inspection

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

      OK: There is no foreign material. 

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

      Fig 1: Identifying Platinum Hot Wire (Heater) Of Mass Airflow Meter
      G05751923Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminals

      Specified Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Condition
      1 (THA) - 2 (E2) -20°C (-4°F) 13.6 to 18.4 kΩ
      20°C (68°F) 2.21 to 2 69 kΩ.
      60°C (140°F) 0.49 to 0.67 kΩ

      If the result is not as specified, replace the mass air flow meter

      Fig 2: Identifying Mass Air Flow Meter Connector Terminal
      G05751924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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