DS5 DPF Regeneration.

[GiveMeABreak]

Thank you for a very informative post that has broadened my knowledge considerably.

What is your background Marc? I have seen many of your previous posts and it is obvious that your knowledge of french cars is truly comprehensive. I'd hazard a guess that you are a retired time-served french car technician who used to run a dealership franchise. Just a potshot, hope you don't find my question intrusive and I'll understand if you don't respond.

Whatever, thanks again..

Nothing could be further, but I often find customers in my dealership talking to me whenever I'm there and on many occasions the salesmen have handed over to me as they couldn't answer questions! I'm just an enthusiast that has owned Citroens for over 40 years and built up a lot of experience. My background is pretty boring - IT, Training and Contract Management / Ops amongst other things!

[tricoloured]

Hi Marc

If you were refering to my post when you said "Contrary to what has been said above, the PSA system unlike some Ford models do NOT inject diesel into the exhaust", what I actually said was "It does things such as injecting diesel on the exhaust stroke" refering to post injection, I am very aware of the Ford method of injecting diesel directly into the exhaust and much prefer the PSA method with the additive.

Regards

[GiveMeABreak]

Noted, I suspected it was, I just wanted to make the distinction.

[tricoloured]

Noted, I suspected it was, I just wanted to make the distinction.

Appreciated

Cheers

Bobby

[andyandjulie]

Hi

Thanks for enlightening me Marc, you mention a dealership and salesmen so I was more right than you let on, and I suspect you are much more than a veteran Citroen enthusiast. No matter, I'm glad that you are there.

I intend to get my local expert, the guy that unblocked the DPF, who I like and trust, (not the one that did the AdBlue delete) to visit. I want him to plug the car in to his diagnostic computer and check that there is nothing in the ECU parameters that will hinder factory spec. active/passive regeneration. I think it was Paul that suggested that the DPF additive system may have been accidentally deleted when the AdBlue delete was done. That's a thing I'll ask him about.

What else should I get him to check while he's got his machine connected? Any obvious questions I should ask? Do you think that there's a "Restore all DPF regeneration parameters to factory defaults" option?

I just want the car to be right. And sorry that this has become a really long thread..

Do please let me know and thanks again for the expert help..

Andy

[GiveMeABreak]

Ok, so you have to understand that as we don't know exactly what was done, I can only speculate and offer possibilities / suggestions.

I don't know if the engine ECU was reconfigured or had a specific map applied that has deleted specific options.

If the engine ECU was rec0nfigured, it may be a matter of locating changes and reconfiguring these to the factory defaults for your specific engine (this is not going to be easy if you don't know what was there int he first place - these are usually configured via PSA servers specifically to the vehicle with correct parameters at the factory.

Second, if there has been a specific 'map' applied to the ECU, then this may have wiped out certain options, so they may not even by visible.

If this was me (and of course I'd never of have anything like this done in the first place ), I'd personally ask my dealer to re-download the engine ECU software, which should update the ECU with the correct parameters as it had at factory. They'd charge a diagnostic fee of course as they would need to manually check the download has been applied, but this may be the easiest way to restore the factory options and eliminate guesswork.

As far as regeneration goes, 'passive' regeneration is just that - if you are driving on a motorway for example and the exhaust gasses are 550 °C then the particle filter will automatically burn off the particulate matter without the need for any assistance. It's just the assisted element that relies on the engine ECU being able to do its job. So for assisted DPF functionality to work, the additive pump need to be present, configured and working, as a minimum, otherwise it will not be doing the fuel tank.

Of course the SCR features require a lot more configuration - the NOx sensor (s), Urea pump, Urea injection and tank operations for example - and these may be missing or 'deleted'.

[Mihael_M]

If I may suggest. They use LED 5mm 20mA, color as desired. Since they are LED for a voltage of 1.5 V, they must be used with a resistor of 560 Ohm 1/4 W. There are already preconfigured LEDs with a resistor. Here's an example from Amazon :
https://www.amazon.com/EDGELEC-LED-Ligh ... 10?sr=8-10
I don't know about your location if there is an electronics store where you can buy only 1 piece. Amazon sells 30 pieces.
I installed my diode on the door.

[andyandjulie]

Ok, so you have to understand that as we don't know exactly what was done, I can only speculate and offer possibilities / suggestions.

I don't know if the engine ECU was reconfigured or had a specific map applied that has deleted specific options.

If the engine ECU was rec0nfigured, it may be a matter of locating changes and reconfiguring these to the factory defaults for your specific engine (this is not going to be easy if you don't know what was there int he first place - these are usually configured via PSA servers specifically to the vehicle with correct parameters at the factory.

Second, if there has been a specific 'map' applied to the ECU, then this may have wiped out certain options, so they may not even by visible.

If this was me (and of course I'd never of have anything like this done in the first place ), I'd personally ask my dealer to re-download the engine ECU software, which should update the ECU with the correct parameters as it had at factory. They'd charge a diagnostic fee of course as they would need to manually check the download has been applied, but this may be the easiest way to restore the factory options and eliminate guesswork.

As far as regeneration goes, 'passive' regeneration is just that - if you are driving on a motorway for example and the exhaust gasses are 550 °C then the particle filter will automatically burn off the particulate matter without the need for any assistance. It's just the assisted element that relies on the engine ECU being able to do its job. So for assisted DPF functionality to work, the additive pump need to be present, configured and working, as a minimum, otherwise it will not be doing the fuel tank.

Of course the SCR features require a lot more configuration - the NOx sensor (s), Urea pump, Urea injection and tank operations for example - and these may be missing or 'deleted'.

Hi Marc

One again thank you for the enlightening/thorough response. I intend to look into this. I have learnt a lot recently!

Andy

[andyandjulie]

If I may suggest. They use LED 5mm 20mA, color as desired. Since they are LED for a voltage of 1.5 V, they must be used with a resistor of 560 Ohm 1/4 W. There are already preconfigured LEDs with a resistor. Here's an example from Amazon :
https://www.amazon.com/EDGELEC-LED-Ligh ... 10?sr=8-10
I don't know about your location if there is an electronics store where you can buy only 1 piece. Amazon sells 30 pieces.
I installed my diode on the door.

Hi Mihael

That looks very slick and professional, thank you for the reply. And thanks for the Amazon link. Sadly our local Maplins shop closed a year or two back. I wish we still had Tandy, I'm sure they would've had one. I spent hours in there as a kid.

Now that I know the specification of the LED I'm sure it will be no trouble to find one somewhere.

Thanks again..

Andy