Modifying Motronic 2.3.2 ECU hardware and software.

[-ice-]

kymi, what about RAM 0x5D?

Bye

[prj]

my eyes are tired, but after looking at it, i think the throttle signal is also connected to the adc of the boost chip

thank you

Touche.

[-ice-]

my eyes are tired, but after looking at it, i think the throttle signal is also connected to the adc of the boost chip

thank you

[kymi]

-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.

[prj]

But the throttle potentiometer is solely connected to the adc of the fuel/ign controller

Nope.

[-ice-]

Hi,

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

Bye

[prj]

Hi,

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.

THINK.

[-ice-]

Aha it might be this synchronous shift register mode...

Bye

[-ice-]

Hi,

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

[prj]

let's get back to topic...

I'm wondering how actual rpm and throttle position are transfered to the boost/knock controller

Regards

Exactly the same way as fuel/ign controller.

[-ice-]

let's get back to topic...

I'm wondering how actual rpm and throttle position are transfered to the boost/knock controller

Regards

[RichLV]

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?

[Carles20vt]

You already are going at this the wrong way. You are looking at it externally, listen to what people are saying based on watching gauges and what not.
You will never get anywhere beyond pub talk with this approach.

Your ECU has a target pressure map. This is the boost it runs end of.
There is nothing to discuss here.

You are basically making conversation on whether 1+1=2 or not. Waste of time.
Open the binary, find the target pressure map(s) and you will know exactly what boost it runs. No voodoo magic or pub talk involved.

Okey I understood. It's true to speculate it's a waste of time with no results. So I need to forget all I know and start reading a lot, comparing HEX, etc.

Problem is, you have not a clue whats going on in the ECU... so you are far away from asking specified questions... because on this ECU nobody will share information until you spended lot of effort by yourself... as we did for years...

I will be a lot of month thinking with motronic all day and at dreams. So I could imagine what are you trying to say

By the way, I "have" wasted some time these days to search and collect a lot of info that I need digest and it will take a lot of more time to me. I'm also thinking to buy another ECU and emulator to try to put into practice what I will learn. Then I will return here...

Wish me luck!!!

[blackS2]

I have checked with some colleges and they correct me. With 100% throttle opened, they blow 1,2 or so. Then it drops about 0,8b aprox in most cases (And I might modify it with soft maybe). Sorry for doing stupid questions... The problem was that I'm doing a 3B to ABY/ANN conversion these weeks and I can't check new AAN stock software by myself. So then I trusted with what I was told and was not correct. When I have all the electronics "ABY / AAN" working at my car and I get my own conclusions will take up the issue.

I will continue studying the firmware and hope to return with more appropriate questions.

Cheers,

Problem is, you have not a clue whats going on in the ECU... so you are far away from asking specified questions... because on this ECU nobody will share information until you spended lot of effort by yourself... as we did for years...

[prj]

I have checked with some colleges and they correct me. With 100% throttle opened, they blow 1,2 or so. Then it drops about 0,8b aprox in most cases (And I might modify it with soft maybe). Sorry for doing stupid questions... The problem was that I'm doing a 3B to ABY/ANN conversion these weeks and I can't check new AAN stock software by myself. So then I trusted with what I was told and was not correct. When I have all the electronics "ABY / AAN" working at my car and I get my own conclusions will take up the issue.

I will continue studying the firmware and hope to return with more appropriate questions.

Cheers,

You already are going at this the wrong way. You are looking at it externally, listen to what people are saying based on watching gauges and what not.
You will never get anywhere beyond pub talk with this approach.

Your ECU has a target pressure map. This is the boost it runs end of.
There is nothing to discuss here.

You are basically making conversation on whether 1+1=2 or not. Waste of time.
Open the binary, find the target pressure map(s) and you will know exactly what boost it runs. No voodoo magic or pub talk involved.