Mass Air Flow Meter: Inspection

1. Check the output voltage.
   1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
      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.
   2. Using a voltmeter, connect the positive (+) tester probe to terminal 3 (VG), and the negative (-) tester probe to terminal 2 (E2G).
   3. Blow air into the MAF meter and check that the voltage fluctuates.

   If the result is not as specified, replace the MAF meter.

   Fig 1: Applying Battery Voltage Across Terminals 1 (+B) And 2 (E2G)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Perform a visual check for any foreign matter on the platinum hot wire (heater) of the mass airflow meter shown in the illustration.

   OK: There is no foreign matter. 

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

3. Check the IAT sensor.

Fig 2: Identifying Platinum Hot Wire

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Temperature And Resistance Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   4 (THA) - 5 (E2)	-20°C (-4°F)	12.5 to 16.9 kΩ
   	20°C (68°F)	2.19 to 2.67 kΩ
   	60°C (140°F)	0.50 to 0.68 kΩ

If the result is not as specified, replace the MAF meter.