On-Vehicle Inspection [10/2022 - ]: Procedure

Pre-procedure1

• 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. Put the engine in Inspection Mode (Maintenance Mode).

     Powertrain > Hybrid Control > Utility 

     Tester Display
     Inspection Mode

  3. Start the engine.

• 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	Result
  Mass Air Flow Sensor	Idling (engine warmed up)	1.5 to 4.9 gm/sec	gm/sec
  Mass Air Flow Sensor	2500 rpm (without load)	5 to 15 gm/sec	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 [10/2022 - ] 

Post-procedure1

• None

Pre-procedure1

• 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.

• 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	Result
  Mass Air Flow Sensor	Idling (engine warmed up)	1.5 to 4.9 gm/sec	gm/sec
  Mass Air Flow Sensor	3000 rpm (without load)	5 to 15 gm/sec	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 [10/2022 - ] 

Post-procedure1

• None

Pre-procedure1

• Remove the air cleaner cap sub-assembly.

• 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

Post-procedure1

• Install the air cleaner cap sub-assembly.

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

   HINT: 

   • for 1Motor-HEV Model:

     Refer to INITIALIZATION [10/2022 - ]

   • for Gasoline Model:

     Refer to INITIALIZATION [10/2022 - ]