Fixing a Microsquirt ECU That Won't Connect

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I started out with a Microsquirt engine control unit that was known to be faulty, but unknown to what extent; just that it wouldn't establish connection. First, I determine what the fault is using my multimeter and oscilloscope, then repair and test it.

When wiring the ECU, make sure you are careful with the power/serial grounds. The serial ground should not be tied into the power ground, since it is not meant to handle very much current.

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