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Originally Posted by EcoCivic
My ECU is from a JDM Honda Stream
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I have seen only one Honda Stream, but it was Euro-spec AFAIK.
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I'm thinking the ECU either doesn't know that it's supposed to be controlling the idle since it doesn't know that it's in neutral or the ECU can't bring the idle down far enough now that it doesn't have the load of the transmission's pump on it anymore.
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Probably it's because the ECU doesn't get any signal input from the transmission in order to identify which gear is engaged. And since many automatics already start moving as soon as the brake pedal is released when in gear, the ECU increases the RPM because the other electronics don't deliver a speedometer signal.