Mass Air Flow Meter: Inspection

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

      If the voltage does not fluctuate, replace the mass air flow meter.

2. Measure the resistance to check the intake air temperature sensor.
   Fig 1: Measuring Voltage Between Mass Air Flow Meter Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 2: Resistance And Temperature Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Using an ohmmeter, measure the resistance between the terminals 4 (THA) and 5 (E2).

Standard resistance 

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