while wiring up my 1G-G i've been concerned that there were some wires connected to the ECU in positions which the diagrams suggest are meant to be vacant.
so i've opened up the ECU to view the cct board and found i can work out positions, and there is just one i can't figure nor find data for [i've searched these forums] - ELS.

Does anyone know what this does?

cheers,
Ray