If you've wondered what is inside a modern Mazda ECU, here you can find out without incurring the cost that I did.

The ECU enclosure is in marked contrast to the CMU of the Mazda Connect infotainment system. Whereas the PCB of the CMU is exposed to moisture and contaminants, the ECU is assembled to keep the PCB safely isolated.

The sealant was so tenacious that opening the ECU required damaging the cover.

Not that long ago, such a design would require a bevy of digital components with discrete processor and memory. However, as you can see, the SuperH CPU has everything in a single IC.

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