2.2HDi Fuel Cap Sensor How to?

This is the Forum for all your Citroen Technical Questions, Problems or Advice.

Moderator: RichardW

kentc5
Posts: 231
Joined: 25 Oct 2012, 22:27

2.2HDi Fuel Cap Sensor How to?

Post by kentc5 » 12 Oct 2014, 21:37

Hello guys,

My C5 keeps going in limp mode, as soon as it warms up and it hits the motorway, I assume it tries to regenerate and all the lights come on (ESP, EML, Service, ESP not working and Antipollution Fault).
When I plug in the Lexia it says
P1447 (Permanent Fault, Dust Filter (FAP) Particulate Filter Punctured or Exhaust Differential Pressure Info
P1435 (Remote Fault, Permanent Fault, Fuel Additive System. Fault fuel filler cap presence sensor.

I can clear the faults, but once I hit the motorway they come back on.

I have tried to find the plug for the fuel cap sensor (on top of the fuel pump, under the rear seat.) however there are I think 4 or 5 two pin connectors... which on earth is the one I need?
How can I access the sensor on the fuel cap side? as the haynes manual does not have any reference for it what so ever.

I plan to access the sensor from the fuel cap side.. and pull the cable to see which is moving? Am I thinking right?

Cheers in advance guys.

Hell Razor5543
NOT Alistair or Simon
Posts: 8264
Joined: 01 Apr 2012, 09:47

Re: 2.2HDi Fuel Cap Sensor How to?

Post by Hell Razor5543 » 12 Oct 2014, 21:50

I believe (but I am NOT certain) that the way a C5 'sees' the fuel cap opening/closing is by use of magnets and reed switches (I recall seeing something about it somewhere on this forum).

kentc5
Posts: 231
Joined: 25 Oct 2012, 22:27

Re: 2.2HDi Fuel Cap Sensor How to?

Post by kentc5 » 12 Oct 2014, 22:22

I have found the sensor on ebay, if you click on the link there is a picture as well.

http://www.ebay.co.uk/itm/PEUGEOT-407-6 ... 5af1f16711

kentc5
Posts: 231
Joined: 25 Oct 2012, 22:27

Re: 2.2HDi Fuel Cap Sensor How to?

Post by kentc5 » 12 Oct 2014, 22:42

I do not think Eolys fluid has finished or the FAP is end of life... as I have checked the service history and FAP was replaced at 100.000miles then it was replaced again at 120.000 miles along with the Fuel Additive tank and ECU, but there was a comment saying that the Fuel Cap Sensor was faulty and quoted price of £45 ... but by what I see that was not replaced by the specialist, they only did the rest for £1300!! what a false economy that was :(
So the filter and the Eolys has only been on for 20.000 miles.
I have already used a DPF cleaner in the diesel, that should have cleaned something....

I have found the part number apparently and it is 6534HY

RichardW
Forum Treasurer
Posts: 8312
Joined: 07 Aug 2002, 17:12

Re: 2.2HDi Fuel Cap Sensor How to?

Post by RichardW » 13 Oct 2014, 08:54

I suspect the first code is the one bringing limp mode on - it suggests the FAP diff pressure sensor is gubbed. What does it say the DP is on Lexia?

kentc5
Posts: 231
Joined: 25 Oct 2012, 22:27

Re: 2.2HDi Fuel Cap Sensor How to?

Post by kentc5 » 13 Oct 2014, 08:59

RichardW wrote:I suspect the first code is the one bringing limp mode on - it suggests the FAP diff pressure sensor is gubbed. What does it say the DP is on Lexia?



Hi Richard this is the exact wording from Lexia P1447 (Permanent Fault, Dust Filter (FAP) Particulate Filter Punctured or Exhaust Differential Pressure Info
Is that sensor located under the bonnet? I might have a go to clean it then... IPA is safe?

RichardW
Forum Treasurer
Posts: 8312
Joined: 07 Aug 2002, 17:12

Re: 2.2HDi Fuel Cap Sensor How to?

Post by RichardW » 13 Oct 2014, 09:19

If you look in parameter measurements somewhere under the Engine in Lexia you should be able to find the diff pressure reading - also if you press enter with the fault up, it should give more info - eg engine speed and diff pressure (and possible a reference pressure). It should be 0 engine off, and probably not much about that at idle, rising to say 30-50 mbar at 3000 rpm. Unlikely you can clean it, I expect it will have to replaced. No idea where it is on 2.2 - but if you follow the pipes / tubes from either end of the FAP they will lead you to it.

Replacement part no 161809 which is £110 - although quite a few on the 'bay at £50-£60. Suggests replacement with 1618Z9 (which is the sensor fitted to a most later cars - all models) at £53, plus the bracket (£5) and pipes (£35) - pretty sure you could make the later sensor fit without the bracket and pipes - although they seem about the same price on e-bay, so probably not worth it! No clear location, but suggests it is on the bulkhead at the RH side of the engine bay.

kentc5
Posts: 231
Joined: 25 Oct 2012, 22:27

Re: 2.2HDi Fuel Cap Sensor How to?

Post by kentc5 » 13 Oct 2014, 09:31

I will go out and do the readings...
will do it with limp mode on and one more when I have cleared the faults (if I can find it after)

User avatar
KP
Posts: 4425
Joined: 10 Jul 2006, 12:11

Re: 2.2HDi Fuel Cap Sensor How to?

Post by KP » 13 Oct 2014, 19:01

The filler sensor isnt too hard to do but wash out and i mean really wash out the arch before you try and remove it and then when its removed get the hose in there and really clean it out as when your under it the amount of stuff that comes out is nasty so wear some glasses! the other thing is that its worst time of year to do it :( i did mine in the dry warm summer and that made it a lot easier!

It should just slide in and out of its holder but the running of the cable is the important thing. Pull the old sensor off and then feed the cable as best you can to replace the old on and then with as little ductap as possible cut the cable of the old one and ductap the sensor to it as you will need to pull it up and into the cabin from thru the fuel tank access hole as this is where the connector terminates. If you cant do this its a right bugger to feed in by hand without dropping the tank somewhat and that is done by loosening off 3 or 4 bolts iirc but do it when there is little fuel in the tank to make your life easier.

kentc5
Posts: 231
Joined: 25 Oct 2012, 22:27

Re: 2.2HDi Fuel Cap Sensor How to?

Post by kentc5 » 13 Oct 2014, 19:11

I know exactly what you mean, I thought the whole fuel cap housing will slide out once I remove the only hex scrue I seen ,that was a big mistake as soon as I undone it I heard a clonk... and the fuel cap locking mechanism fell off in the wheel arch!!! AARRGGGG LOL
So I had to undo 2 bolts pop the wheel arch a bit and put it back in position.
I pulled the rubber around the filler neck back and seen the sensor, it is still in position etc. But when I checked the connectors with me meter for resistance .... they all seemed to be open?, so there might be a broken wire somewhere?
I could not figure out which cable is which so I tried all 3 of them.
Here is a picture of the cables.
Image


By the way I did a forced regeneration for the DPF ... wow that thing runs hot! lol it totally dried the concrete behind the car. And the backbox was kind of burning (loads of smoke) but thankfully it was just smoke.

kentc5
Posts: 231
Joined: 25 Oct 2012, 22:27

Re: 2.2HDi Fuel Cap Sensor How to?

Post by kentc5 » 14 Oct 2014, 16:59

Well I am getting furstrated now, I have been searching online for about an hour! and there is no info of where the differential pressure sensor is located on the 2.2HDi engine :(
Does anyone have a clue? as there are so many vacum pipes going to various sensors in the engine bay?

Below are some screenshots of the Lexia Diagnostic screen, the additive level keeps increasing gr by gr, it was 145gr a few days ago... and now creeped up above 150gr, have no clue what that is, but I cannot imagine it would have perished after 20.000 miles?

Image
Image
Image
Image

User avatar
MikeT
Posts: 4410
Joined: 11 Jun 2007, 16:17

Re: 2.2HDi Fuel Cap Sensor How to?

Post by MikeT » 14 Oct 2014, 17:26

kentc5 wrote:Well I am getting furstrated now, I have been searching online for about an hour! and there is no info of where the differential pressure sensor is located on the 2.2HDi engine :(
Does anyone have a clue?


Exhaust gas pressure sensors (from which the differential is calculated) would be screwed into both ends of the particle filter. Diagram shows what looks like steel tube couplings (when I would have expected signal wires) that meet alongside the front sensor and are bracketed together.

kentc5
Posts: 231
Joined: 25 Oct 2012, 22:27

Re: 2.2HDi Fuel Cap Sensor How to?

Post by kentc5 » 14 Oct 2014, 17:34

MikeT wrote:
kentc5 wrote:Well I am getting furstrated now, I have been searching online for about an hour! and there is no info of where the differential pressure sensor is located on the 2.2HDi engine :(
Does anyone have a clue?


Exhaust gas pressure sensors (from which the differential is calculated) would be screwed into both ends of the particle filter. Diagram shows what looks like steel tube couplings (when I would have expected signal wires) that meet alongside the front sensor and are bracketed together.


These are the pictures of what I get when I look for 2.2HDi pressuse sensor
Image


And this is what the haynes manual has for the 1.6HDi and the 2.0HDi
Image

They both appear to operate with vacum :(
so you suggest that it would be under the car , instead of the engine bay area?

User avatar
MikeT
Posts: 4410
Joined: 11 Jun 2007, 16:17

Re: 2.2HDi Fuel Cap Sensor How to?

Post by MikeT » 14 Oct 2014, 18:21

That makes sense of those tubes then. Is it possible they've been cross-fitted thus lexia unable to get a differential reading? If you locate the tubes on the exhaust, can you not follow them to that sensor? I'll see if I can find it's location on servicebox

kentc5
Posts: 231
Joined: 25 Oct 2012, 22:27

Re: 2.2HDi Fuel Cap Sensor How to?

Post by kentc5 » 14 Oct 2014, 18:23

Thank you Mike, with the weather as it is, kind of hard to get under the car.
But if the worst come to this then I will have to go under the car and look for trail ....
A shame Citroen's servicebox is not free like the peugeot? or is it? I have not tried it.