C5 X7 1.6 THP -11 Code P2279

[Sami_R]

Hi, I have now huge problem with engine code P2279. It seems to be coming, no matter what I do. There is no engine light, but car goes some kind of safety mode, when cooling fan is on at full speed all the time. Then when I read codes, there is P2279. Then I erase the codes and 50-300km is fine. Then it appears again.

Only thing what I can say about car's behavior is that sometimes when you accelerate little faster from standstill to about 80kmh, automatic gearbox stay in 4th gear after you stop accelerating and acceleration is also little "wavy". Not much, but just enough that you can feel it. This happens sometimes, not every time. I do not know if this is related to code P2279, but this is what I have noticed.

Done so far:
- Checked intake for leaks. Everything seems to be fine.
- Checked timing. Was little off. Assembly with new parts, chain, sprockets, etc. Timing ok.
- New VVT solenoid.
- New MAP and Intake Pressure sensors.
- New intake gaskets.
- Breather valve seems to be ok.

Can this be caused by throttle body? Is there some method I can test it?

[GiveMeABreak]

Ok, so there is a known fault for this when the cooling fan runs at high speed with this fault code on these petrol engines.

It means the Air pressure in the air intake distributor is inconsistent with the throttle angle of the motorized throttle body.

This is a rough translation:

Check for the absence of air intake at the intake.
Timing adjustment (if necessary).

Check that there are no air leaks in the intake:
Faulty seal
Damaged air intake distributor
Stitching (seal / weld / integrity?) of the deteriorated canister
Dislocated pipe

Repair any air leaks.

[Sami_R]

Thanks Marc!

I have checked all the connections and seals. Also inspected pipes and intake manifold. All seems to be fine.

What canister do you mean by this:
Stitching (seal / weld / integrity?) of the deteriorated canister

[Sami_R]

Can this be related to Vacuum Reservoir. That I have not removed and inspected yet.

[GiveMeABreak]

The literal French is:

"Piquage du canister détérioré"

[Paul-R]

Something to do with the fuel vapour collector. There's a post here about deleting it (not recommended) which might help you understand it and identify it. It's in French but using Chrome and then translate makes life easier.

http://secma-f16passion.forumactif.org/ ... d-essences

[GiveMeABreak]

That would likely be referring to the fuel vapour recovery tank??? - which shouldn't affect the issue which is to do with air intake, but worth checking. Thanks Paul.

[Paul-R]

If I read correctly, they're suggesting that the plastic canister might have a leak along the seam somewhere. I don't know how that ties in with the air intake but what do I know about petrol engines?

[GiveMeABreak]

Exactly my thoughts.

[Sami_R]

Thank you for your input guys!
Where is this vapour canister located in C5?

[GiveMeABreak]

If you need a parts diagram Sami, you'll need to upgrade your membership:

If you need an original, genuine part number, and can't already find the info you need on the Forum, we do ask for a membership upgrade for official parts data as we are in turn charged for this. It will cover you for future part number requests for up to 2 years, so excellent value.

If interested, links are below, then pop your VIN up.

A response to your question by a Forum Admin requiring parts or additional information requires you to have made a current contribution (£10 min.) to the Forum.

To Upgrade Your Membership & Donate Click Here For Further Information About Vehicle Parts and VIN Numbers Click Here

[Sami_R]

Thanks for the info Marc. I was not aware of that.
Of course I will donate. This has been good forum so far.

[GiveMeABreak]

Hi Sami

Thanks for your Forum donation. Any future part number requests, just ask on the main thread here:

Citroen Official Part Number Requests

Here's the diagram for the vapour Absorption cannister:

(1) Petrol Vapour Absorber Canister, part: 1502K7, £187.32
(2) Is the Purge Solenoid Valve, part: V759514680, £83.34

So whether they mean the actual solenoid valve may be leaking or the canister itself I can't say.

[gwest]

It would be good to also check the engine breathing plumbing. Some of the connections are in difficult places to access, like under the inlet manifold.

[Sami_R]

All the hoses and connections are okay. Also the vapour canister looks fine. Purge solenoid valve is clicking ok, but there is some kind of membrane also inside. I don’t know if that is okay. Also I’m starting to suspect throttle body also.