David, I attempted what you suggested... unfortunately, I don't think I got the expected.PSIG wrote: ↑Wed Feb 19, 2020 2:21 amNot to worry, as this is an output with little chance of burning something when using the GM 4-pin as a coil driver. That said and for giggles, connect B+ to B, and ground to the mounting hole. Nothing else connected. Put a meter set for continuity from C to ground. It should read no continuity. Apply 5V (from the Speeduino 5V pin or a board 5V source) to G. Terminal C should now show continuity. Don't forget in all of this, that the ground for the module and for Speeduino must be shared (same source or grounds connected).
Likewise, you can connect it all as it will be in the vehicle (except coil), and use the Hardware Test mode in TunerStudio. Again test terminal C for state change when the signal is sent by Speeduino.
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