Infiniti Repair Questions? Ask a Mechanic for Answers ASAP
unless you have a signal generator and an a oscilloscope then its quite difficult to 'test' the ECU
what I'd suggest is the car isn't starting is to 1st check the ECU power is present by measuring voltage at the fusebox and on its relay socket
if there's 12V on the fuse with the ignition on then check to see if you're opening the fuel injectors, if the injectors are working you can hear them click - its difficult to hear them with background noise so use a long screwdriver like a stethoscope, placing the handle end in your ear and the metal tip against the body of the injector whilst your assistant turns the engine over.
and if this is all OK then I'd consider sending the ECU off for testing / repair
the ECu power relay should be in the underhood fusebox, the underside of the lid should ID what relay is what
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