Mass Air Flow Meter: Inspection: Inspection

INSPECT MASS AIR FLOW METER

Check the output voltage.
1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
  
  Fig 1: Identifying Mass Air Flow Meter, Connector & Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  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 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.
Perform a visual check for any foreign matter on the platinum hot wire (heater) of the mass air flow meter shown in the illustration.
OK

There is no foreign material.

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

Fig 2: Identifying Platinum Hot Wire
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the IAT sensor.

Fig 3: Identifying MAF Meter & Resistance Chart

GTY170585

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

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

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