[iyade46]

mercedes E212 P056200 control unit fuel pump has malfunction

fuel pump changed but still have the same fault code 

any idea ?

thank you so much

[autocar15]

change Fuel Pump ECU

[gcs190]

Seeing that capture, the problem is not the pump, but you can change all the components involved to continue the same or find someone who knows what he is doing and solves the problem. Having a diagnostic system does not make you a mechanic and, unfortunately, nowadays everyone has access to a diagnostic system that they do not understand, do not know how to use or have the basic knowledge to call themselves a mechanic. Look for a professional and not a parts changer, you will save money.

[iyade46]

Seeing that capture, the problem is not the pump, but you can change all the components involved to continue the same or find someone who knows what he is doing and solves the problem. Having a diagnostic system does not make you a mechanic and, unfortunately, nowadays everyone has access to a diagnostic system that they do not understand, do not know how to use or have the basic knowledge to call themselves a mechanic. Look for a professional and not a parts changer, you will save money.

I can't understand  why you are so upset and angry about this advice and ask for help and thank you anyway

[gcs190]

I am not bothered by anything, in your capture it is intuited that the problem is not the pump, in fact you have spent money changing it for nothing, you can continue changing all the components that you see in your capture or diagnose the problem which will be cheaper and a professional job, I'm sorry you don't like my message but in your case you should find another mechanic who knows how to diagnose and not just change parts in case you're lucky, that's the reality.

[iyade46]

I am not bothered by anything, in your capture it is intuited that the problem is not the pump, in fact you have spent money changing it for nothing, you can continue changing all the components that you see in your capture or diagnose the problem which will be cheaper and a professional job, I'm sorry you don't like my message but in your case you should find another mechanic who knows how to diagnose and not just change parts in case you're lucky, that's the reality.

there was real problem with the pump and car cranking very long to start so i have to change it any way car now start fast and fine but i have that faults which make engine light come on 
hope you understand now

[t8Cal]

looking at all those faults I'd start looking at a common chassis ground first

[gcs190]

looking at all those faults I'd start looking at a common chassis ground first

It is so obvious!!!!  in addition to the undervoltage of the uce!!!!

[gcs190]

Have you made progress in diagnosing the problem?  If the answer is negative, contact me to work remotely on your system and locate the two problems you have.

They are no cost to me.

[BabeH]

Cranking too long to start, with those faults,
check voltage and starter first !

However ECU fail will also trigger some faults and even difficult or fail to start engine.
If ECU fail, most of the time it won't tell "I am dying" but it will trigger sensors fail and communication errors etc.
So if you have spare ECU on hand it is easier to swap a working ECU and test before replace everything.
I saw many case like that.