C5 2.2 HDI Eolys Fluid & Service Light

C5IAM · Unread post by **C5IAM** » 31 Dec 2006, 22:52

About October time I asked for help regarding the tank for the EEolys fluid and the warning that the fluid level was low. Well, thanks to all your help I filled the tank and I initially thought the service warning went off on it's own. However, each time I used the car (a 51 reg) the warning still ppeared. In the end I went into Citroens to have it turned off, only to be told that they had a problem and found that there was a faulty ECU. This was a known fault. I discussed it with them as to why there was not a recall out for this etc but did not get anywhere. In the end I phoned Citroen Technical who confirmed they would contribute £37.50 (50%) towards the cost. This is really to let others know that there is a known fault on early C5's re the ECU. I think the answer would be to top up the fluid before the warning light comes on. Mine came on at 67000, so I shall top up again at about 100k

Unread post by **lolingram** » 01 Jan 2007, 02:10

How about simply checking the level when changing oil/filter?

KevMayer · Unread post by **KevMayer** » 01 Jan 2007, 14:18

I've thought about the particulate filter since having my C5.
What if the Silicone Carbide filter matrix was removed from the housing in the exhaust pipe and the Eolys tank simply filled with diesel. Also, the Intercooler bypass divert could be dissabled so the air always goes through the intercooler. This may improve performance. But would it comply with the MOT requirements ? and would the ECU be able to tell that something had changed ?

cheers, Kev

C5IAM · Unread post by **C5IAM** » 01 Jan 2007, 22:51

Hi Lol, Sounds like a good idea but checking the level is not that simple. Citroen reccomend changing/topping up at 50000 miles, mine lasted 67000 so it does not need checking every 12500 miles, to avoid the light coming on about 45/50000 should avoid it.
Kev, Your suggestion is beyond me, but like you say would the emissions still pass the MOT? I got Citroens to change my particulate filter at 67000 miles and asked to see the old one. In my view the old one had plenty of service left as the visible deposits were very slight. I shan't be in such a hurry to change it again as performance had not been affected at all.

wheeler · Unread post by **wheeler** » 03 Jan 2007, 18:08

KevMayer wrote: would the ECU be able to tell that something had changed ?

cheers, Kev

Yes it will,there is a pressure sensor in the exhaust that measures the difference in pressure before & after the cat/particle filter.It will bring the engine management on.

KevMayer · Unread post by **KevMayer** » 04 Jan 2007, 19:56

I have been thinking about the pressure sensors before and after the particulate filter housing.

I get the impression that they'd trigger an alarm if they saw a large pressure difference which would mean that the filter is blocked. A healthy filter (or indeed no filter at all) would give a low pressure difference.

So, with this theory, if the filter was missing wouldn't everything seem ok ?

Here's hoping..... Kev

p.s. Happy new year everybody

wheeler · Unread post by **wheeler** » 04 Jan 2007, 20:59

If there was no filter there would be no difference in pressure.
At idle there should be about 5mb of pressure difference on a healthy filter.if the injection ECU was to see no difference it will think that there is a leak in the system & bring on the anti pollution warning/engine management light.

bbrucez · Unread post by **bbrucez** » 02 Feb 2007, 09:34

I've tried to find my tank without success.
Do all 2.2s have them?

wheeler · Unread post by **wheeler** » 02 Feb 2007, 17:24

All 2.2 C5's have them (well UK spec ones do)

KP · Unread post by KP » 02 Feb 2007, 18:12

Could you not just remove the sensors and fit something that sends a false reading back to the ECU for both??

PowerLee · Unread post by **PowerLee** » 02 Feb 2007, 18:31

KP wrote:Could you not just remove the sensors and fit something that sends a false reading back to the ECU for both??

No, Its too smart for that & will easily sense you have been fiddling with it & have a nice big expensive sulk, why waste time & money trying to fool the ECU, Far easier to just pay & do the job correctly in the first place.

curly · Unread post by **curly** » 14 Feb 2007, 12:54

You have all been talking about the oil tank for the partical filter but how do you get to it and how do you fill it up? and does the ecu have to be reset to let it know that the oil tank has been refilled or is it set up with a sender unit in the tank? and if the partical filter is self cleaning why do you have to have it replaced.

wheeler · Unread post by **wheeler** » 14 Feb 2007, 18:32

curly wrote: if the partical filter is self cleaning why do you have to have it replaced.

By self cleaning it means that the carbon/soot particles are burned off,normally these particles burn at 550 degrees celcius. The problem is the filter can only reach around 450 degrees.when the eolys fluid is added it reduces the burn off temp to 450. the next problem is eolys fluid doesent burn & stays trapped in the filter hence the reason it needs eventually replaced/cleaned.

Brian UK · Unread post by **Brian UK** » 17 Feb 2007, 23:35

According to the lable on the bottle the Eolys fluid is keroscene based, so it ought to burn. The description on the PSA site says that it is the ash left over from burning the soot which has to be cleaned out eventually. They even have an animation showing it being dumped in a bin.

wheeler · Unread post by **wheeler** » 20 Feb 2007, 19:18

The active ingerdient in the Eolys fluid is Cerine which doesent burn off (well not at the temperature reached by the exhaust anyway). Which type of Eolys fluid were you looking at that had the Keroscene ingredient Eolys DPX 42 or Eolys 176 ?

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C5 2.2 HDI Eolys Fluid & Service Light

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