Inspection [10/2017 - ]: Procedure

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

Perform a visual check for any foreign matter on the platinum hot wire (heater) and temperature sensor (thermistor) of the mass air flow meter sub-assembly shown in the illustration.

There is no foreign matter.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Platinum Hot Wire (Heater)
*b	Temperature Sensor (Thermistor)

Clean the mass air flow meter sub-assembly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Air Blow Gun
*b	10 mm (0.394 in.)
*c	Airflow Hole

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.

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:

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Air Blow Duration
*b	3 to 6 Seconds
*c	1 Second
*d	Air Blowing
*e	Air Stopped

Check the intake air temperature sensor (thermistor) resistance.

*a	Component without harness connected (Mass Air Flow Meter Sub-assembly)

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
1 (THA) - 2 (E2)	Always	0.47 to 19.3 kΩ

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