![]() ![]() This is how the RPM signal gets from the ECM to the Instrument cluster in a factory ALH.Ĭonnecting to the CAN bus you need a CAN transciever to read the messages from the bus and a microprocessor to get the message off the transciever and do something useful with them. I don't know the structure of these messages, but the speed over here is similar to logging with a VCDS.įastest, 500kbps. You have to ask for each piece of data using a standard set of OBD II codes. There's three ways to get data out of the ECM: Tach, water temp, boost, etc, it's all there as a digital value in the cluster. So there's the ECM, full of all sorts of data that we'd love to have looking up at us from the instrument cluster. ![]() Here's my example: a 2000 Jeep TJ instrument cluster displaying RPM from the ALH ECM. This thread contains all the Arduino code and other resources I used to make it happen. There's probably a million ways to do this but this is probably one of the easiest if you're like me and not a software programmer. ![]()
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