Unplugged wires by ECU in 2006 WRX
 

I was rooting around by my ECU and notice there is a blue plug taped to the ECU wires, but doesn't appear to be plugged in to anything.I didn't pull it fully out as running out of daylight.

The car is a 2006 WRX Type UK

I assume I don't need it, but does anyone know what it is for?

https://cimg1.ibsrv.net/gimg/www.sco...a603acf129.jpgUnplugged wire

It's a shield joint connector

http://clarkdh.net23.net/NTL/Shielded%20connector.JPG

Thank you :)