Inspection [11/2015 - ]: Procedure

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

Check the output voltage.

Connect a battery positive (+) lead to terminal 1 (+B) and negative (-) lead to terminal 2 (E2G).

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

NOTE:

While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.

Connect the positive (+) tester probe to terminal 3 (VG) and negative (-) tester probe to terminal 2 (E2G).

Blow air into the mass air flow meter sub-assembly and check that the voltage fluctuates.

Click Location & Routing(C5)

Click Connector(C5)

Tester Connection	Condition	Specified Condition
C5-3 (VG) - C5-2 (E2G)	C5-1 (+B) - Auxiliary battery positive (+) C5-2 (E2G) - Auxiliary battery positive (-) Blow air into the mass air flow meter sub-assembly	Voltage fluctuates

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

Perform a visual check for any foreign matter on the platinum hot wire (heater) and intake air 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	Intake Air 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.

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

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

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

Standard Resistance

Click Location & Routing(C5)

Click Connector(C5)

Tester Connection	Condition	Specified Condition
C5-4 (THA) - C5-5 (E2)	Always	0.48 to 17.7 kΩ

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