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Modifying Motronic 2.3.2 ECU hardware and software.
I wanted to have a crack at Motronic as well, I have extensive background in electronics and programming but after reading this thread I'm leaning towards getting a VEMS unit as suggested by multiple people to get a hang of mapping.
Bit of offtopic but I was wondering if someone has seen a base map for stock AAN for VEMS circulating around somewhere?
I have absolutely no idea how this could work...
All three mcus are connected together through the serial lines ok.. 80c535 usually have tx (P3.1) and rx (P3.0) pins.
As far as I know you always have to connected a tx wire to a rx receiver (crossed). I can't prove this on the board. I'm not sure but i even think the tx are clamped together... how could this even work when two devices send simultanesouly?
is there some kind of loop-back modus used?! I'm not sure who talks to whom here...
I have absolutely no idea how this could work...
All three mcus are connected together through the serial lines ok.. 80c535 usually have tx (P3.1) and rx (P3.0) pins.
As far as I know you always have to connected a tx wire to a rx receiver (crossed). I can't prove this on the board. I'm not sure but i even think the tx are clamped together... how could this even work when two devices send simultanesouly?
is there some kind of loop-back modus used?! I'm not sure who talks to whom here...
Regards
Come on, you are overcomplicating this.
I told you - the boost/knock controller gets the signals EXACTLY the same way as the fuel/ign controller does.
let's take the throttle position. To get the throtte position fuel/ign controller reads the ADC. But the throttle potentiometer is solely connected to the adc of the fuel/ign controller
-ice-, you must know what's the ram address for the throttle position used in maps. Search that ram address. It's not direct feed but trace a couple steps back. It seems to be the nature of this boost-chip.
The analog input of the tps is put into 0x5d internal RAM and used in many routines (boost control, overboost calculation etc.)
I dont't have much knowledge about the boost chip at the moment. I can tell you from the code which map is read. But i don't know anything about the axes. Just that rpm and tps are used as axes.
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