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I have the following ECU Accent 2012 1.4L, 4-Cyl, 4-speed transmission board in the picture, I have searched for the information written on this product but couldn't find any schematics. Is there a way to extract the schematics of a board or a wiring diagram? I need the voltage values that each component receive, and there are no voltage values written on the board.

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    What board? That looks like the case which is also the heatsink.
    – Solar Mike
    Jul 14, 2021 at 16:51
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    The board is inside...
    – Solar Mike
    Jul 14, 2021 at 17:04
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    I would start at the other end: what sensors connect to this ecu and how do they work - resistance change, open close contacts etc
    – Solar Mike
    Jul 14, 2021 at 17:14
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    Generally auto manufacturers do not publish schematics of these sorts of devices as they consider them to be an FRU (field replaceable unit) vs. something that can be repaired in the field. While they may have a repair depot that receives these back from dealers and which may salvage or repair them, that is all handled internally. If you need a schematic you will likely have to create it yourself by tracing out the connections on the board. This, however, is probably a lot less useful that it might sound as these are usually packed with proprietary parts for which you will not find a source
    – jwh20
    Jul 14, 2021 at 17:17
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    Good luck opening that thing. They're generally totally 'potted' (i.e. completely embedded in a solid chunk of "stuff". You're not gonna just open the case and have access to the PCB. First you gotta melt that potting off. Re: schematic - Also "good luck". The OEM has no reason to, and many reasons not to, and thus will not provide you with one. Take some advice from a complete stranger (who happens to fix alot of cars and is an electrical engineer) -- Forget this project, suck it up and buy a new computer. You are not going to be able to service this.
    – Kyle B
    Jul 14, 2021 at 19:17

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