Hi all,

This is my first post so please be gentle ^^.
I bought a Doblo Multijet 1.9 a couple months ago.
I quickly had a DPF DTC and MIL on with 3200 rpm limitation.

I managed to unclog it twice doing long drives (Limitation and MIL turning off automatically). But it came back soon after.

I have used MultiECUscan today and got some good infos:
The guy had previously tried a forced regen before selling but the tempterature didnt exceed 550 degres.

I drove about 600 and 200 km.
The filter was 88% clogged and by staying there 20 mins with the engine on it ramped up to 90.

I managed to get some data during those 20 minutes :
At any time :
Intake Air = Req Intake
Fuel pressure = Req Fuel Pressure
No Lambda readings
throttle vale opening 5%

800 rpm

EGR Opening slowly reducing stuck at 35% 45% then to 4%
differential pressure 53 mbar

2000 rpm

Differential 73-80 mbar
EGR Opening 40 %

3000 rpm

Differential 200-250mbar
EGR Opening 39% 40%
boost 60%
req boost 1200mbar given 1190mbar


My questions :

- Why can't I read lambda ?
- Do you see something dodgy ? i think the EGR could need some cleaning.
- I thinking about having the filter pressure washed for 150€. What do you think ?

Thanks in advance!

Hi,

This might help: https://www.fiatforum.com/doblo/443017-finally-happened-error-code-p1206.html

Cheers

Ron

thanks. Duely noted and kinda reassuring. I've also forgot to mention. My doblo is from 2006. Apparently there was an update in 2007 of the ecu that would help (apparently stopping at 3200 doesn't really help regeneration).

Still anyone who tried pressure washing the dpf?

I've also noticed this pipe being completely stuck. What is it used by? I couldn't see where it's going.

Nerzum said:

I've also noticed this pipe being completely stuck. What is it used by? I couldn't see where it's going.

Click to expand...

That is the pipe leading to the vacuum pump

Id get the filter removed and cleaned with the proper chemicals
I't also sound like your egr valve may be sticking a bit so getting then cleaned or replaced should also help in the long run

Alright guys thanks. Here are some updates:

After a long hassle I managed to remove the egr valve and check it: almost like new. I think the previous owner had had the dpf issue and went straight to changing the egr.

Now I have changed the air filter and disassembled the dpf.
I cleaned it with oven spray and destop (soda) with a garden hose. It was quite enjoyable to see all the dirt coming out. I. The end the water ran much faster through the filter

Now I still have an issue. Removing the screws was impossible and i had to saw them. I'm left with this trying as hard as I can to remove them. I'll keep you posted.

I think that when I'm done reattaching it I'll put some kind of insulation around it. It just hardly gets hot enough even during a regen

[FONT=&quot]I feel for you. I have been there, Ive felt your pain but I found a way out of the hell that is the Doblo DPF.:bang:[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Firstly, the reason the Doblo suffers with so many DPF issues is that the car was never designed with a DPF. In fact, DPF's had not been invented when the Doblo was designed and therein is the real issue. You see when they retrospectively fitted a DPF they simply put it where they could....where there was space. The problem is that it is too far away for the engine and so doesn't allow enough heat to build up, after all it is heat that cleans the thing. Moreover, the heat shielding actually speeds the air up as it flows over the filter. In short, the DPF on the Doblo was always going to be a massive problem, so much so that Fiat actually introduced a free software upgrade, and all that did was pour more un-burnt fuel down the exhaust.[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]So how to fix it, well there are so many issues that trigger faults, on the DPF there are 2 sensors, pressure and heat, either of these will cause the issue. Then there is the Turbo. Wear on the turbo shaft seals cause small amounts of oil to enter the filter, and that blocks it.[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]In the end I decided to removed mine and have it deleted of the ECU, that and the EGR valve. Now at MOT time, I put the old DPF back on and it sails through, I then take it back of and for 5 years its run like clockwork (it takes just 5 bolts and 30 mins).:devil:[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]My last MOT was a week ago, with the new MOT, it passed no issue. The DPF on the Doblo should never have been fitted when it was, it was always going to be troublesome from day 1.[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Lastly, with the DPF removed and deleted along with the EGR on the ECU, you won't believe how it changes the way it drives, it's like a different car ....... more than 100% better.[/FONT]

Yeah sounds tempting actually. But I live in Germany and the law might be quite harsh with me if it ever gets noticed that I drive without dpf. Having the egr deleted might be a good start though. I assume power increases and consumption drops?

I have finally managed to drill out the old screws and fitted the dpf back on.
Took it for a drive. Pleasently powerful.

But bloody hell I got a new error. P2081 pre catalyst intermitant error.

Apparently it is the heat sensor screwed in the dpf.

Either the water left in the filer caused a short for a moment or I damaged it trying to remove it. Everything was completely seized.

I've heard it happens to people who put a catback instead of a dpf

Apparently some people have had this issue after moving cables servicing the egr.

Does anyone know where the sensor connects to?
Also what is this little box?

See box

[FONT=&quot]I dont recall what the box is, it does though have a BAR code, have you tried scanning in it with your mobile, then cross referencing online.[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Also, the temp sensor on the DPF seizes solid, and I mean SOLID. This is why it's easier to remove the DPF. I can't imagine you would be caught, 99% of Doblo were made without them. The pressure sensor union on the dpf also has a habit of breaking apart.[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Regards deleting the EGR, you ether delete the DPF and EGR together or not at all. If you think about it, the EGR reticulates exhaust gasses back into the cylinders so that it is re-combusted and the particulates are burnt to ash. Without the EGR you will block the DPF even quicker.[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]I also want to say that the EGR is perhaps one the worst pieces of technology ever invented. Think about it, you are told to regularly change your air filter. Unfortunately, downstream of the air filter we have an EGR valve which reticulates sharp particulates of carbon back into the engine, pollen bad- carbon good.[/FONT]

alright the dpf is cleaned and back on the car.
We will see how long it will stay clean.
The EGR valve was clean.

However that error that came up right after I repositionned the dpf was coming from a sensor between the catalyser and dpf. I had to remove the plastic cover under the engine and resolder the cable. See picture.

It is called pre catalyst in multiecuscan but it's a generic exhaust temperature sensor. I think it must have been a rodent and a long time ago. Could it be that it affect the Regen?
I assume if the ecu sees a temperature at 999,99 it won't inject much more gas.

We'll see thanks for your help