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.