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Mass Air Flow Meter: Inspection

INSPECT MASS AIR FLOW METER

Measure the voltage to check the mass air flow sensor.

Fig 1: Identifying Voltage Between Mass Air Flow Meter Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.

Measure the resistance to check the intake air temperature sensor.

Fig 2: Intake Air Temperature Sensor Graph

G05539226

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an ohmmeter, measure the resistance between the terminals 4 (THA) and 5 (E2).

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Specified Condition
4 (THA) - 5 (E2)	13.6 to 18.4 kΩ at -20°C (-4°F)
4 (THA) - 5 (E2)	2.21 to 2.69 kΩ at 20°C (68°F)
4 (THA) - 5 (E2)	0.493 to 0.667 kΩ at 60°C (140°F)

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