Technical Ducato DPF help

[Googlebot]

Morning all.

Had the P2002 error code come up. Won’t regenerate even after taking it for a high rev run.

Recently also replaced the DPF pressure sensor as that was coming up as a fault.

I haven’t relearned the sensor to the ECU and someone mentioned I needed to.

Is it likely a sensor fault or the DPF? Do the aerosol cleaners work? New DPF is about £350 but don’t want to chuck money at it if the sensor just needs relearning.

All advice greatly appreciated.

 

[theoneandonly]

P2002 Resistance to air flow in high particulate filter, Plausibility
the X250 DPF differential pressure sensor is mounted low down and can be prone to condensation issues in the pipework. When replacing the sensor the pipework also needs blowing out to shift any water. It is one of the sensors that needs to be relearned to the ecu either with a specific routine or under the umbrella reset learned functions. You are correct that this sensor controls when regen can take place.

This is easily done with Multiecuscan.

DPF Differential Pressure sensor Diagnosis with MES

How to diagnose a problem the DPF Differential Pressure sensor and its impact on the DPF. known in mes parameter list as Differential Pressure Sensor. These sensors are prone to any debris or condensation in the exhaust, which can cause the...

www.fiatforum.com

What software/ hardware do i need to read OBD2 Codes

This a much bigger question than first appears. If we limit it to what is a cost effective DIY solution to "read my Fiat and simple maintenance issues eg change the oil in my euro 6 or add a new MAF sensor" then the answer for me reduces to...

www.fiatforum.com

Dpf cleaning would be a second stage after replacement and learning of the sensor.
First is to measure the particulate filter clogging. If it is less than 100% then cooking on gas If it is less than 120% run for a 10-20 miles @60mph (warm engine) if you have had a regen then cooking on gas if not cleaning is advisable. (do not do a forced regen in this state an easy way to crack the DPF). Once this is done and we need to talk cleaning dpf, the next post

 

[Googlebot]

Thanks for your help. That’s makes sense.

I have a copy of multiscan on the way. The sensor was replaced in August but has done about 3000 miles since. It wasn’t the original Fiat sensor either that came off so I suspect it is as you say, a highly replaceable item.

Interestingly the code P2454 DPF pressure sensor circuit low is now also pending. That was the reason I replaced the old sensor which sorted the engine light.

I will know far more when I have a look with multiscan.

Really appreciate the help. I know I don’t contribute much here, I don’t know much about engines. Motorhomes I can help with.

 

[theoneandonly]

Really appreciate the help. I know I don’t contribute much here, I don’t know much about engines. Motorhomes I can help with.

We do what we can. More Motorhome questions than there ever used to be, now that we actually answer them rather than suggest other sites, so your experiance will be useful to someone.

 

[theoneandonly]

Interestingly the code P2454 DPF pressure sensor circuit low is now also pending. That was the reason I replaced the old sensor which sorted the engine light.

Iteresting to see what the 5V line for the sensor is.
When you get MES run the Template ive yet to create. it is a x250 facelift?

 

[Googlebot]

Iteresting to see what the 5V line for the sensor is.
When you get MES run the Template ive yet to create. it is a x250 facelift?

I think it’s an x250 facelift. Build date was 2012, registered in 2013.

 

[theoneandonly]

Tutorial to Measure specific Engine PIDs (Parameter ID) and Save data for analysis.

This was originally written to help one person with his Ducato totally new to MES to start saving data. it is not an exhaustive manual nor intended to be. Tutorial to Measure specific Engine PIDs (Parameter ID) and Save data for analysis. Open...

www.fiatforum.com

The new version 5.3 opens and connects in a different manner to the guide.
Try measuring these pids parameters.

 

[Googlebot]

Brill! Thanks for all your help, I have had a good mess with the free version on demo and I am impressed.

I will have a good look over the weekend and see what I can find and report back.

As the sensor is only a few months old, will it be knackered by not being coded, or do you think it will be okay?

It isn’t a big job to change it. I have no idea where it came from as I was stuck in France with the engine light on and was desperate. It was new but looked very cheap.

Thanks again for helping out, I am a bit lost and it’s a complex system.

 

[theoneandonly]

Brill! Thanks for all your help, I have had a good mess with the free version on demo and I am impressed.

I will have a good look over the weekend and see what I can find and report back.

As the sensor is only a few months old, will it be knackered by not being coded, or do you think it will be okay?

It isn’t a big job to change it. I have no idea where it came from as I was stuck in France with the engine light on and was desperate. It was new but looked very cheap.

Thanks again for helping out, I am a bit lost and it’s a complex system.

Is existing ok? Dont know, fancy being a guinea pig then dont change it code it monitor it then tell us else being risk adverse says replace with a bosch part and dont forget to blow out pipes and check for water in sensor.

Complex system! For sanitys sake dont get a twin egr motor.

 

[Googlebot]

Right then, looks like the DPF is good.

It would barely start today and kept cutting out. Until I cleared the codes, then back to normal. Would that be limp mode?

It can’t be that value for the DPF sensor on idle with that ash loading, it was also reading the same as idle with the engine off.

New DPF sensor is on the way. It was very very cheap, I may investigate a better one if I manage to sort the problem.

My money is on the DPF pressure sensor.

Coding it made no difference.

Also, it immediately came back with the fault regarding the DPF pressure sensor so if it isn’t condensation or wiring, I can only conclude the new sensor is stuffed.

 

[theoneandonly]

The pressure value can fit a range at idle the important thing is how it changes with revs. If you ran for any lentgh of time you should have a csv file autosaved in the multiecscan csv directory (or in the directory set , look at F9 settings directories. If you post the csv file i will have a look. As you say from this info " I can only conclude the new sensor is stuffed."

 

[Googlebot]

The pressure value can fit a range at idle the important thing is how it changes with revs. If you ran for any lentgh of time you should have a csv file autosaved in the multiecscan csv directory (or in the directory set , look at F9 settings directories. If you post the csv file i will have a look. As you say from this info " I can only conclude the new sensor is stuffed."

It did rise a little with revs. Not much mind, think it went up to about 47mb.

I will get the sensor off over the weekend and check it along with wiring and pipes and exhaust leaks.

If it’s reading pressure with the engine off, I don’t hold out much hope for it.

I will have a good play and see if I can get a graph sorted. Alas I don’t have time before work tonight.

Thanks again.

 

[Googlebot]

Had a look at the sensor DPF pressure sensor this afternoon. It was full of water as was the pipe.

After making sure everything was cleared, connected back up and took it for a run. On idle it was reading 150mb going up to 240ish on a run.

The regen kicked in twice in quick succession. This time it successfully completed both times and looked like it was all sorted. However the pressure still looks too high and it was only 3 miles between regens.

So, no engine management light but the sensor does indeed, look stuffed!

Will update again when the new one arrives. For anyone interested, I took the old one apart and it was wet all the way through.

I did set all the parameters but somehow stuffed up the CSV file. That’s a job for another day now when the new sensor is here.

From Fiat they are £250, I have one on the way that was £13. I have doubts it will be any good but they don’t look like a £250 bit of kit either.

 

[theoneandonly]

I bought my Bosch spare 3-4yr ago about £40-50.
The water is typical . Hope the cheap one sorts the issue. I presume the sensor is in the other half cavity.

 

[Googlebot]

I bought my Bosch spare 3-4yr ago about £40-50.
The water is typical . Hope the cheap one sorts the issue. I presume the sensor is in the other half cavity.

It was, some kind of circuit board, other half seemed dry.

The only bonus is that they are easy to change and very cheap.

 

[Googlebot]

Gave up waiting for the ebay part. Visited the local motor factors and got a new DPF pressure sensor.

Coded the new part in and cleared the fault code.

Before the pressure didn't seem to drop below 100mb at idle and was as high as 300mb, graph below shows the new sensor, much better!

Took it on a run and no sign of regeneration at all. The old sensor wanted to regenerate after 3 miles, so far 15 miles and no regeneration evident as of yet.

Does this look like a healthy DPF? I am presuming so and wasn't going to try and clean or force regen it.

Fingers crossed all is fixed, apart from upgrading to multiecuscan, that was much cheaper than I thought it was going to be (I hope).

 

[theoneandonly]

@Googlebot Does this look like a healthy DPF? I am presuming so and wasn't going to try and clean or for
Yes, excursions upto 100mbar ok, with time and another regen may come down a tad but time for sweating over big bills are over.

 

[Googlebot]

Fingers crossed. Will update the thread if anything else occurs. Thanks again for the help.