With CONSULT-II
WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
Check mass air flow sensor signal in "DATA MONITOR" mode with CONSULT-II.
3.8 - 5.2 g.m/sec: at idling
16.0 - 21.5 g.m/sec: at 2,500 RPM