Nginx node helth check (no replies)

Hi !
We currently use NginX as a L4 switch.
We have 1 single Upstream VIP which has 2 real nodes of Apache web server.
If all nodes under the VIP works fine, we always get normal response from the NginX whenever we try ping test from out of IDC.
My question is that, if all nodes under the VIP went down, does ping test to the VIP returns failure ?

Thanks.