Fiat Doblo Family 1.9JTD type 223 - Strange problem

[Siscoo]

Hello Everybody,

I need a good advice/help...
I got my Doblo since 2010, little faults etc, all sorted by myself and my ELM+Multiecuscan (this is why we are here )
...but now I stuck.

Little prelude: Doblo 1.9JTD type 223, 1.5yrs ago bought from ebay a tuning box, (from TDI-Tuning), perfect, in city the fuel consumption dropped from 9l to 6.7l/100km... 1 months ago I removed all the injectors, got new seals, sorted.
Prepared the car for a long England to Hungary trip, same as we did last year without any problem... ~2100km in 5.7l/100km average perfect.
But, backway, just in the middle of Germany limp mode, grrrrr... I got my laptop and the ELM, connection, body, dashboard.... but no engine module.

I guess, its tried to start a DPF cleaning, but as it never was success ( I did it manually before) and this is why it went to limp mode...

But why I cant see the ECU (I got a U1601 C-Can line error), before I was able to connect

-F16 7.5amp fuse checked, OK
-ECU connectors contact cleaned

And now, my Doblo not rewing upper than ~3200, black smoke, no power.

Today morning I checked all the connections in the engine bay fusebox, the other box (in the middle, just over the engine), and the driver side fusebox front, I left few more connections on the back, but I didnt had time to clean that side. Cleaned (with carb cleaner) and reconnected the MAF sensor.

Didnt started the engine as I halfway in the EGR cleaning, just tried to connect to the ECU, and still the same.

Only the Body computer and the Dashboard appear, the engine not.
The funny thing is, nothing changed, same laptop, same ELM adaptor, same 1.7 registered multiecuscan, the above two comp. is working and communicating, so the rest should be fine...

So this is the sad situation...
Any answer and solution appreciated.

Thanks in advance!

[alfa156sarajevo]

You can try to remove tunning box and then try to access to engine ecu...
Had similar case on one Citroen... After removing tuning box could read ECU and clear errors.

[Siscoo]

Thanks the reply,

That was the first thing what I did. Disconnected the tuning box. Sadly same... Cant connect to engine, the rest is ok.

[Siscoo]

...Todays update

fixed back everything to start the engine, diagnostic, still no connection to ECU.
Engine start, slow rewing up, aaand lots smoke. Im guess is still in limp mode, but without reaching the ECU... well


In the meantime I just bought a e-manual, tomorrow searching thru the cable nodes between ECU and body comp. Maybe I will find something

Any ideas welcome


Today's update 2.

I nearly forgot, I got a family friend with Fiat Grande Punto 1.9JTD... so letz gooo

Aaaaand its connected to ECU, so, I know now my ELM+laptop+software is OK.
This is the good news...

Bad news...
The engine started with same sickness, no ECU connection, so I will check the cables and connection between OBD and ECU... Gonna be a good fun

I will update later,
Any ideas welcome

[alfa156sarajevo]

Maybe engine ECU is faulty...

[Siscoo]

Well... Back...

Mixed feeling, but much more better now.

Yesterday I sorted the ECU thing. I working in nights, so not easy, but the first thing to share what happened

Did anybody know that, if you have a blown F39 10A fuse (on the body comp), which is a radio, and you forget to change, like me, because you have a permanent own installed +12V wire to the radio, you wont be able to communicate with the Engine modul? I put a new one in, and voila
After removed -just for test-, and same result like before...

Now, I seen the ECU, yepp. Went to limp mode, didnt cleaned the DPF... This is the reason, still

...and here is the second issue
I tried to clean but was not successful. Incorrect conditions:(

The question is, what conditions needed for DPF force regen?

What I roughly know:
EGR closed, cleaned and in working condition (I had a 3.8899 something%),
Minimum % fuel(?)
No other error codes(?)
Min 70C engine temperature
Pre-cat/particulate filter temperature(?)
Is there are any minimum distance what is have to do between two force regen (ex min 100km)(?)


Please help, i feel I just one step away from the solution

Thanks in advance guys