2021 Lexus RC F BaseFACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection [09/2014 - ]: Procedure

  1. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY 

    HINT: 

    Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

    Refer to INITIALIZATION [09/2014 - ]

    1. Read the value using the Techstream (MAF).
      NOTE:

      Perform the inspection of the mass air flow meter sub-assembly while it is installed to the air cleaner cap sub-assembly (installed to the vehicle).

      1. Check and ensure the following conditions:
        1. Turn off all electrical loads, such as the air conditioning, etc.
        2. Check that the coolant temperature is 75°C (167°F) or more.
        3. Put the shift lever in the N position.
      2. Connect the Techstream to the DLC3.
      3. Start the engine.
      4. Turn the Techstream on.
      5. Enter the following menus: Powertrain / Engine / Data List / MAF.

        Powertrain > Engine > Data List 

        Tester Display
        MAF
      6. According to the display on the Techstream, read the Data List when the engine is running.

        Standard Condition

        Tester Display Condition Specified Condition
        MAF Idling 4.0 to 7.0 gm/sec
        2000 rpm 12.0 to 16.0 gm/sec
        3000 rpm 17.0 to 23.0 gm/sec

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

        If the result is within the specified range, check the intake air temperature sensor (thermistor) resistance.

        Refer to INSPECTION [09/2014 - ] 

  2. CLEAN MASS AIR FLOW METER SUB-ASSEMBLY 
    NOTE:

    If the mass air flow meter sub-assembly is removed and installed 10 times or more, the thread of the hole of the mass air flow meter sub-assembly may be damaged. Therefore, do not loosen the screws of the mass air flow meter sub-assembly.

    1. Remove the air cleaner cap sub-assembly.
    2. Clean the mass air flow meter sub-assembly.
      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 airflow hole.
      GTY1019778Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Mass Air Flow Meter Sub-assembly
      *a Air Blow Gun
      *b 10 mm (0.394 in.)
      *c Airflow Hole
      1. Using an air blow gun, clean the hole of the mass air flow meter sub-assembly by applying approximately 10 intermittent bursts of air to the airflow hole at a pressure of approximately 392 to 981 kPa (4.0 to 10.0 kgf/cm2 , 57 to 142 psi).

        HINT: 

        Apply 5 intermittent bursts of air to the airflow hole at 2 locations.

        GTY943463Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Air Blow Duration
        *b 3 to 6 Seconds
        *c 1 Second
        *d Air Blowing
        *e Air Stopped
    3. Install the air cleaner cap sub-assembly.
  3. PERFORM INITIALIZATION 
    1. Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

      Refer to INITIALIZATION [09/2014 - ]

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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.