On-Vehicle Inspection [01/2017 - ]: Procedure

HINT: 

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

Refer to INITIALIZATION [01/2017 - 09/2018] , or refer to INITIALIZATION [09/2018 - 04/2020] , or refer to INITIALIZATION [04/2020 - ]

1. Read the value of Data List item "Mass Air Flow Sensor" using the Techstream.
   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. Turn the power switch on (IG) (do not start the hybrid engine).
   4. Turn the Techstream on.
   5. According to the display on the Techstream, read the Data List when the engine is running.

      Powertrain > Engine > Data List 

      Tester Display
      Mass Air Flow Sensor

      Standard Condition

      Tester Display	Condition	Specified Condition
      Mass Air Flow Sensor	Idling	3.8 to 6.5 gm/sec
      	2500 rpm	10.8 to 16.0 gm/sec

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

      After cleaning (air blowing) the mass air flow meter sub-assembly, perform an on-vehicle inspection of the mass air flow meter sub-assembly again and replace the mass air flow meter sub-assembly if the result is not as specified.

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

      Refer to INSPECTION [01/2017 - ] 

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.

   Courtesy 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.

      Courtesy 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.