Testing and Inspection of Mass Air Flow and Intake Air Temperature Sensors - Page 614
MAF sensor inspection
1. Remove MAF and IAT sensor.
2. Connect battery (2) and voltmeter (3) to MAF and IAT sensor (1) as shown in figure.
3. Check that voltage varies depending on amount of blowing air as the following graph. If faulty condition is found, replace MAF and IAT sensor.