Bosch ECU - Reprogramme To Ignore Faults?

[pugsport]

"DUMBSTRUCK"

Why oh why do clever people always try to over complicate matters, why cant you just keep it simple? Never heard of 2nd hand replacements!

[steve_earwig]

Yes, hmm, dodgy second hand parts. I used to live by them once, then the breakers started charging almost what they cost new. Then there was the time I bought soomething real expensive which didn't work, when I took it back they denied all knowledge. Still, I miss 'em here

I reckon, if PEL wants to mess with it then he might come up with something useful. He might not of course, but at least he'll have had a go. I would just say don't wipe anything out 'til you understand it, although a car that's seriously playing up is only marginally better than one that doesn't work at all. You could always keep chickens in it...

Good luck anyway.

[ParisEngLtd]

I'll take that as a no to the question then jameslxdt, jeeezzzus just wondering if it was something anyone knew was or wasn't possible, wasn't expecting the high horse brigade !!!!!

May become a mute point now as I have had some info that may solve the problems once and for all (although nothing has succeeded yet!) without needing to investigate more extreme possibilities

[steve_earwig]

*Kicks MJB off horse*

No no no, not at all, please feel free to be our guinea pig Something needs to be done to get rid of FAP on older cars before they all write themselves off.

Although, if you do have an alternative it might save you a lot of work in the end.

Btw, while I have OED open, moot

[teamster1975]

May become a moot point now as I have had some info that may solve the problems once and for all (although nothing has succeeded yet!) without needing to investigate more extreme possibilities

That's good news
Somtimes I yearn for the days before fuel injection and sensors on every bloody orifice of the car! I can fix carbs!

[V6Exec]

This thread seems to have a few "healthy" opinions in it.

Lets play nice

Having a FAP ECU is perhaps no surprise. The car has ECU's for most functions and it fits in with the bus system.

Here is the thought - FAP seems to be the bane of every HDi owner's life. If we can produce "know good responses" from a working FAP ECU from a simple microcontroller, the FAP problems are gone.

No precision milling required, just something much harder - finding a car without a FAP problem.

The CAN/VAN bus will be a pain, but an analyser will help. Record the conversation during a number of starts. Next programme a microcontroller to answer the challenges with the correct responses.

Any thoughts

[mjb]

The CAN/VAN bus will be a pain, but an analyser will help. Record the conversation during a number of starts. Next programme a microcontroller to answer the challenges with the correct responses.

Why don't you do something much much simpler like get a microprocessor with 2 CAN interfaces and get it to proxy everything, fixing up the bad readings?

Same sort of idea After some research, generally speaking PSA use CAN for stuff to do with the engine, and VAN for everything else. The good news is CAN is widely supported and you can pick up microcontrollers with inbuilt CAN interfaces, which'll take a lot of the difficulty away. I haven't read up too much on CAN but it should be possible to make an interface sniff the bus providing you with virtually all you need to do the job. I don't really know anything at all about FAP, but there might be an issue of having to do some work to change the output depending on engine revs or something, shouldn't be too difficult though.

[niz406]

Wow... Guys.... come on, I've just come across this post! ! ! Bad Admin.... pay more attention... ! ! ! Can't we all just get along

I like to see everyone making and effort to make others fit in and feel at home....

Seriously though in ParisEngLtd's favour I have to put my 2 pence/francs in!

Have you ever heard of programs that can turn assembly into usable C code?

Yes... the .Net CLR, it can be used to parse both ways... C#, C++, JAVA, etc -> NAtive / machine / assembly code and vice versa!

[cthulhu]

Yes... the .Net CLR, it can be used to parse both ways... C#, C++, JAVA, etc -> NAtive / machine / assembly code and vice versa!

Unfortunately I don't think MS make a .Net environment for the microprocessor in the ECU ;)

Another thing, though, I doubt the ECU code was ever written in a high level language like C, so disassembling it would very likely make little sense anyway.

Assembler isn't hard to make sense of though, but there's a whole lot of pre-req knowledge about how the ECU package is put together you'll need before you can translate logic into function.

[mjb]

Yes... the .Net CLR, it can be used to parse both ways... C#, C++, JAVA, etc -> NAtive / machine / assembly code and vice versa!

Unfortunately I don't think MS make a .Net environment for the microprocessor in the ECU ;)

Another thing, though, I doubt the ECU code was ever written in a high level language like C, so disassembling it would very likely make little sense anyway.

Think you guys are confusing disassembly with decompilation here Printed out disassembly of hand-written asm is the only real way to make sense of it. Then again, I've not seen much that can decompile into C with any great level of competence, especially if the compiler's had a hand in optimising it.

[cthulhu]

Think you guys are confusing disassembly with decompilation here Printed out disassembly of hand-written asm is the only real way to make sense of it. Then again, I've not seen much that can decompile into C with any great level of competence, especially if the compiler's had a hand in optimising it.

Yes, I used the wrong word when I should have used decompilation, but I think you'll find I've used the right semantics..

[mjb]

Think you guys are confusing disassembly with decompilation here Printed out disassembly of hand-written asm is the only real way to make sense of it. Then again, I've not seen much that can decompile into C with any great level of competence, especially if the compiler's had a hand in optimising it.

Yes, I used the wrong word when I should have used decompilation, but I think you'll find I've used the right semantics..

Just making sure...