Mass Air Flow Meter: Inspection

WARNING: This page is about a different car, the 2006 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT INTAKE AIR FLOW METER

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

Measure the resistance between terminals 4 (THA) and 5 (ETHA).

Fig 1: Measuring Resistance Between Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

SPECIFIED CONDITION CHART

Condition	Specified Condition
-20°C (-4°F)	13.6 to 18.4 kΩ
20°C (68°F)	2.21 to 2.69 kΩ
60°C (140°F)	0.493 to 0.667 kΩ

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