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Mass Air Flow Meter: Inspection

INSPECT MASS AIR FLOW METER

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
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.

Check the IAT sensor.

Fig 2: Identifying Platinum Hot Wire (Heater)

G05628243

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: MAF Meter Temperature Graph

G05628244

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

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.