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Title: rpm gauge to visualize mapswitch on non-CAN speedometer? Post by: sonflasch on May 16, 2023, 07:31:51 AM Hello
as usual, I used the rpm gauge (hack can message) to display the maps. But since I also drive 551k in old S4, it would be interesting if you can also hack the wired rpm gauge. thanks for any suggestions Title: Re: rpm gauge to visualize mapswitch on non-CAN speedometer? Post by: benni4000 on May 16, 2023, 07:48:51 AM Create the call to sub function at the place where pin of Mikrocontroller is getting set.
In this case the rpm Signal is like "redirected" cause its in an pinchange Interrupt on mcu. There you have to Check if you are showing mapswitch or not. If yes just return nothing and let pin untouched. Then create a another Funktion on 1ms Raster and to "rpm to Hz" convertation. Take a Look in schematics of ecu, you'll find them here. It should me P1_13 or P1_12. Or something like that. I dont remember that now. I got some Videos while reversing it with ols300 and oszilloskop. Regards Benni |