I should also say that the wiring is from a WAGON CD Accord VTI.

I think the wagons are made in the USA? where as sedans were jap??Often certain engines do not have vtec pressure switches in one country, but they do for other counties (for example AUDM f23a engines dont have vtec pressure switches, where as the f23a in the USA do have one).

So maybe there is a difference in this regard between q50 and q51 ecu?
As discussed, as you can see in my pic, there is the Vtec Solenoid and a Vtec pressure switch (VTP). Incase you didnt know, the solenoid is the thing that opens a passage for oil to active vtec, and the VTP is basically an oil pressure sensor, so if the oil pressure is too low, then the ecu wont allow vtec to engage. If the factory setup does not have a VTP, then it just activates vtec regardless.