2020 Lexus RC F BaseFACTORY OEM SERVICE PROCEDURE

Inspection [09/2014 - ]: Procedure

  1. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY 
    1. Perform a visual check for any foreign matter on the intake air temperature sensor (thermistor) of the mass air flow meter sub-assembly shown in the illustration.

      OK

      There is no foreign matter.

      If the result is not as specified, clean the intake air temperature sensor (thermistor).

      GTY1019688Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Intake Air Temperature Sensor (Thermistor)
    2. Clean the intake air temperature sensor (thermistor).
      NOTE:
      • Do not contact the mass air flow meter sub-assembly with the nozzle of the air blow gun.
      • Do not insert the nozzle of the air blow gun into the intake air temperature sensor (thermistor) area.
      GTY1019810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Air Blow Gun
      *b 10 mm (0.394 in.)
      *c Intake Air Temperature Sensor (Thermistor)
      1. Using an air blow gun, clean the intake air temperature sensor (thermistor) area of the mass air flow meter sub-assembly by applying approximately 10 intermittent bursts of air to the intake air temperature sensor (thermistor) area at a pressure of approximately 392 to 981 kPa (4.0 to 10.0 kgf/cm2 , 57 to 142 psi).
        GTY943463Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Air Blow Duration
        *b 3 to 6 Seconds
        *c 1 Second
        *d Air Blowing
        *e Air Stopped

        HINT: 

        After performing cleaning, read the value of Data List item "MAF" using the Techstream and if the value is not as specified, replace the mass air flow meter sub-assembly.

    3. Check the intake air temperature sensor (thermistor) resistance.
      GTY507543Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Mass Air Flow Meter Sub-assembly)
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        4 (THA) - 2 (E2G) Always 0.47 to 19.3 kΩ

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

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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.