if you have any sort of check light - the ECU will not allow VTEC operation, the base parameters for VTEC are
No active ecm faults
VSS spd above 50 km/h
engine temp at 80*C
accelerator above 50% open
engine speed above 4000 rpm
VTEC oil pressure sensor ground disconnected after opening of VTEC valve
to test VTEC, splice a wire from the VTEC valve wire and connect it to a bulb or LED, (the wire outs 12V+) when active.