The term doesn't make much sense in English either - a resistor is an electrical component and a coupler is a way of joining things - but it doesn't explain what the resistor coupler is or does, Like I said, it's required by the 1.3 ECU not the 1.6, based on that, if it were me, I'd disconnect it.
I'll try to find a schematic later today and see what it really is.