That could be the purge valve actuator. I know the system does purge the canister, but I don't really know under what circumstances a purge is triggered.
I would think that unless you remove all parts of the EVAP system, and maybe even delete that section of the engine management programing on the EPROM, you would get a SES light. I know for sure it's part of the function list that the ECM "monitors" and has "control via command inputs" over.
Tom