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On-Vehicle Inspection [11/2021 - ]: Procedure

  1. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY 
    1. Read the value of Data List item "Mass Air Flow Sensor" using the GTS.
      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. Start the engine.
      3. According to the display on the GTS, read the Data List when the engine is running.

        Powertrain > Engine > Data List 

        Tester Display
        Mass Air Flow Sensor

        Standard Condition

        GTS Display Condition Specified Condition
        Mass Air Flow Sensor Idling (engine warmed up) 1.5 to 4.9 gm/sec
        3000 rpm (without load) 5 to 15 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 [11/2021 - ] 

  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 [11/2021 - ]

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