I suspect your ECU. There were some differences between Canadian and US fifth gen Civics and some were electrical. The most important might have been that the Canadians seemed not to have the "Electric Load Detector," while the US version did (according to a guy on honda-tech who seems to have owned both CDM and USDM Civics). You have installed a Canadian ECU which will not "know" your car has an ELD. I would wonder what kind of havoc that might play with car functions. Maybe nothing, but I would seek a proper USDM ECU if this were my car.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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