So it was an open between the injector and the ECU. Thanks for sharing the result. The Honda Factory Service Manual called it... and you suspected an open ground from the beginning. The trouble shooting flow charts in the FSM are really good, man. If you don't have the Honda FSM, I recommend. Save a lot of time and frustration on the boards.
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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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