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I've got some people interested in Miata PnP ECUs so I need to put the Honda VR stimulation on hold and switch to Mazda ECU stimulation. This one is much easier since trigger signal is just the trivial open drain, I have discovery pin configured as open drain and it is connected directly to Mazda OEM ECU, and it seems to be working!
Trigger signal
And here you are - there is life in ignition control wires!
I do not want to believe that I am not getting fuel signals because of the lack of CLT or IAT sensors, but I do not know why I am not getting signals in the fuel lines. I am trying to read it as low side driver - continuity mode on the multimeter and trying to drive an LED with it. Nothing
What is the voltage at the IAT/CLT with pull down? I suspect you are correct in making it a pull down, but you may need a pull up. You should have some voltage on the pin.
Status update: I've got the fuel signal once I've provided 'tach signal' which grrrr the same inverted spark out signal produces by the ECU itself. Apparently they have something funny inside the ECU, probably for historical reasons?
This POS is pretty smart - I had to put a transistor for each spark wire so that I have proper RPM at the tach line - with half the RPM it would not supply fuel.
