Possibly 12V voltage regulator for flash programming? There are several unidentified components: Most of the ICs inside are standard components. The other side contains the 'computer' components (processor, memory, etc) as shown below: I do not know if there are any ICs on this side, because I did not open mine up on that side (and at this point, I do not really want to). The side of the ECU with the electrical connector seems to contain power supply and other power-switching components (driver transistors, etc). You must be sure to keep the cover straight and don't bend it, as the flexible circuit board is adhered directly to the inside of it. To open the ECU, one must remove the screws, and carefully pry the cover open. There is gray silicone sealer between the 'cover' and the 'frame'. It is constructed of an aluminum 'frame', or center section, that has the mounting tabs to fasten it to the engine, and a sheet aluminum 'cover', that isn't really a cover at all - the flexible plastic 'circuit board' is adhered directly to the inside of this 'cover', on both sides. The ECU itself is a sealed unit, with a single air vent device. The ECU is connected with a single 50-pin connector. One on the passenger side firewall behind the air cleaner assembly (the Powertrain Control Module, or PCM), and the ECU, which is located on the left side of the engine, mounted directly on the engine block.
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