I don't have any insider info on the ECU software. But my recent experience with misfires (fixed by new plugs and coils) is you can have random misfires without any DTC thrown. My suspicion is that the Misfire DTC looks for a repeating misfire on the same cylinder. If you pulled the coil off one spark-plug, and started up, that should throw a Misfire DTC. The Check Engine Light shows automatically once any engine-related DTC is activated. Bottom line: no DTC, VIDA can't help.
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