LLY Ficm

[2004LB7]

I'd like to see how they integrated the injector driver circuit into the LBZ/LMM ECM

 

[kidturbo]

I'll fire up the old PC and see were I stuck all those pdf files written in German.

 

[Lennart]

I thought the LBZ used piezo injectors vs. solenoid on the LLY/LB7, there is probably not much value looking into the newer designs.
@kidturbo Wenn Unterstützung auf Deutsch benötigt wird, da kann ich helfen!

 

[2004LB7]

I thought the LBZ used piezo injectors vs. solenoid on the LLY/LB7, there is probably not much value looking into the newer designs.
@kidturbo Wenn Unterstützung auf Deutsch benötigt wird, da kann ich helfen!

LML is the only model using piezo

 

[kidturbo]

I thought the LBZ used piezo injectors vs. solenoid on the LLY/LB7, there is probably not much value looking into the newer designs.
@kidturbo Wenn Unterstützung auf Deutsch benötigt wird, da kann ich helfen!

The LML is when they switched to piezo. But my 05 MB 3.2L CDI used piezo, with basically what looks to be same LBZ/LMM ECU hardware. Model # difference, but same board layout internals. So possibly same unit ran both..

Die Durchsicht einiger Dokumente wäre eine große Hilfe.

 

[Lennart]

With the FICM failing sooner or later, would it be a smart investment to replace the caps before they fail? 20 years is 20 years no matter how many miles driven? Will go to a 10A fuse as @2004LB7 recommended at tdiclub.
Any other modules to do preventive maintanance on?

 

[2004LB7]

With the FICM failing sooner or later, would it be a smart investment to replace the caps before they fail? 20 years is 20 years no matter how many miles driven? Will go to a 10A fuse as @2004LB7 recommended at tdiclub.
Any other modules to do preventive maintanance on?

I've recommended the 10 amp fuse here too

As for the capacitors. Yes. It is a good idea to replace them to extend the life. As capacitors age, especially with higher heat as in the engine bay, they dry out. This increases the internal resistance. This makes them heat up even more. Once they reach a boiling point of the electrolyte they leak and blow out the board underneath them. This is a death sentence for most boards. A 10 amp fuse will hopefully blow before the board is too badly damaged

If you feel comfortable with soldering capacitors yourself, the 1st few pages of this thread should have all the parts numbers and values you can purchase

 

[1FastBrick]

I wish I had better news. But I am stumped on a driver circuit for some PWM on the positive rail of the board. It's conflicting with the injector turn on mosfets on the negative rail. Something isn't adding up and can't get them to work without burning out the P-mosfets. We have reached out to another electronics guru to help diagnose this particular issue. Hopefully we get some updates soon

Do we need to die sect one?

 

[kidturbo]

Do we need to die sect one?

We may.. Our hold up is we've presented this circuit problem to several electrical engineers with way better skills, and none came back with a solution. The FUCM won't burn caps now, it just takes out and injector if it fails.. FICM problems are solved.

 

[kidturbo]

Work up with one eyeball working today, and something crawled in the other while sleeping.. What I get for sleeping I guess..

Anyways what I was trying to locate last night is a board schematic from one of closest CDI sister boards used by Fiat or VAG. From what I have found so far, these share same processor, FETS and majority of other chips. along with basically the exact same layout. Just our FICM has an extra set of FETS to cover 8 injectors.

Issue is, these schematic are never listed by any searchable ID relating to the EDCxx numbers or 0 281 ID. They have all been renamed by someone up the line. But attached is an example, and link to pdf file names and board drawing files to search through, if anyone has 2 working eyeballs.. Just one close schematic should unlock this whole layout...

Register at scribd.com, where they are located, or google search the file names.

Here is the post with some Bosch docs we were looking at when researching the boards. The following post also has an interesting schematic I found somewhere.
I have all the files listed in the attached txt linked above. Is 100mb compressed PDF's. Will share where I stashed em, for anyone interested. But I know our LBZ/LMM is in that list.

 

[kidturbo]

Here ya go Jason. It took about 30 minutes with a heat gun to convince the PCB out of its shell in one piece. But think I've located our LMM injector driver circuitry. 8 mofets and 4 mosfets. What they use these monster diameter orange caps for, I'm dying to know...

 

[kidturbo]

Our official Bosch model number for the LMM ECU is a edc16c42
The doc dump I have, only lists a EDC16C, which looks to be the basic circuitry for this series in 4, 6, and 8 cyl version. Found some good pics and video of the EDC16C39, which seems to share all the same part #'s as the LMM. So we should have at least schematics with circuit details we need.

Anyone with LBZ/LMM board knowledge or source of schematics, feel free to chime in. I did stumble across how to read/write the main chips using Jtag tool.. And how someone attempted to clone an LMM into and LBZ that way, and doesn't work. Along with a bunch of other usesless to this project, cool facts..

Here is the closes model wise schematic I could find right off. Maybe we can use the chip part #'s to back trace the driver ciruits.

 

[kidturbo]

PDF schematic last post, I found what looks to be our BUK9219-55A in the LMM ECM.
They are listed as BUK7219-55A in that schematic, which looks helpful..