Eolys?

[GiveMeABreak]

The part number is 1500NK and is priced at £351.17 from Citroen inc. VAT

[imbradas]

Thanks for your quick responce! I had this warning for almost a year, and I was just putting it away for latter time and I am surprised that my DPF blockage reads only 18%. I did the cluch recently and since I was partially taking dpf off, I looked inside at it, and it was surprisingly clear.

I have tried forced regeneration, but the process had failed, probably due to pumps fault.

So are there any tests I can carry out to confirm that the pump is the culprit? For example to test the wiring, or the pump itself?

Or just replace the tank and hope that it sorts the problem. You mentioned that there is probability that the injector can cause the issues as well, so I am thinking it could be good to test the pump before replacing it.

[GiveMeABreak]

Hi - I didn't say the injector could be the cause - I said it is unlikely:

The fuel additive injector is integral to the fuel gauge and cannot be separated - but this is not where your problem is likely to be

If you have been driving motorway miles or longish journeys where the vehicle can maintain a high temperature then natural regeneration can occur more frequently and therefore requires less assisted regeneration. So you have been lucky.

There are no tests as such I am aware of, but this is the info I have on the components and the pin-outs you may find useful.

Reference	Designation	Electrical diagram number
(1)	Particle filter differential pressure sensor	1341
(2)	Fuel cooler	-
(3)	Fuel tank unit	1211
(4)	Fuel filler cap - incorporating:	-
(4)	Fuel tank cap presence sensor	4320
(5)	Fuel additive injection valve	-
(6)	Fuel additive ECU	1282
(7)	Fuel tank	-
(8)	Engine ECU	1320
(9)	catalytic converter + Particle filter (FAP)	-
(10)	Additive tank	-
(11)	Downstream exhaust gas high temperature sensor	1343

So the issue is with (10) which contains the pump inside. The unit is overheating, so is disabled.

Now on this model you have a separate additive ECU (EAS200), so the addive function is NOT controlled by the engine ECU as on some other models.

Reference	Designation
"a"	Fuel additive filling inlet
"b"	breather
"c"	breather
"d"	Outlet to fuel additive injection valve
(12)	Filling union (by the Customer Services)
(13)	Filling union (at the factory)
(14)	Fuel additive pump (1283)

The fuel additive ECU manages:

• The detection of an addition of fuel
• The quantity of additive to be injected in relation to the fuel added
• The minimum additive level in the additive tank
• The diagnostics of the fuel additive pump and of the fuel tank cap

These are the pin outs:

Connector -way	signal
1	Power supply (for the fuel additive pump)
2	Fuel additive ECU supply (1282)
3	+ Body VAN2
4	Fuel tank cap presence switch earth
5	-
6	Fuel additive level measurement signal (*)
7	Fuel additive level measurement signal (*)
8	Fuel additive pump earth (1283)
9	Control of the fuel additive pump (OCR)
10	-
11	-
12	Fuel filler cap presence sensor information
13	-
14	Body VAN 2 (data)
15	Body VAN 2 (data /)
16	Earth

*Note: The fuel additive level sensor is fitted on and connected to the fuel additive ECU ( 1282) but is not functional

Reference	Designation
"d"	Outlet to fuel additive injection valve
(15)	Connector
(16)	Fuel additive level sensor (*)
(17)	Positive displacement metering pump

(*): The fuel additive level sensor is fitted on and connected to the fuel additive ECU (1282) but is not functional.
The fuel additive pump is a positive displacement metering pump.
The quantity of additive delivered depends on the unit capacity of the positive displacement metering pump.
The unit capacity of the positive displacement metering pump is 6,45 mm3.
Depending on the quantity of fuel added, the fuel additive ECU determines the quantity of fuel additive to be injected into the fuel tank.
The fuel additive ECU controls the positive displacement metering pump by means of an OCR signal.

N.B.: 1 pulse of the OCR signal = one injection of a capacity of 6,45 mm3.
N.B.: OCR: opening cyclic ratio.

Fuel additive pump connector

Channel of the fuel additive pump connector	signal	Terminal at the fuel additive ECU (1282)
1	-	-
2	-	-
3	RCO signal	9
4	Earth	8
5	Fuel additive level measurement signal (*)	6
6	Fuel additive level measurement signal (*)	7

(*): The fuel additive level sensor is fitted on and connected to the fuel additive ECU (1282) but is not functional.
The fuel additive pump ( 1283) is controlled by an OCR signal.
Features of the OCR signal:
Opening ratio of 50%
Frequency of the OCR signal 66,67Hz
Amplitude of the OCR signal 12 volts

[imbradas]

Hi - I didn't say the injector could be the cause - I said it is unlikely:

The fuel additive injector is integral to the fuel gauge and cannot be separated - but this is not where your problem is likely to be

If you have been driving motorway miles or longish journeys where the vehicle can maintain a high temperature then natural regeneration can occur more frequently and therefore requires less assisted regeneration. So you have been lucky.

There are no tests as such I am aware of, but this is the info I have on the components and the pin-outs you may find useful.

Oh sorry, I misunderstood your words, regarding the additive injector...

Thank you, and the info is usefull indeed! Atleast now I know it must be a specific signal generated to operate the pump! Great info man! Ill try to update the thread once I sort this!

[GiveMeABreak]

No worries - it may inevitably mean replacing the additive tank - but at least you can do some probing now

[imbradas]

Yea thats the thing, its easy just to change the parts, but so many times I have changed them intuitively, but it hasnt solved the problem. So now if something breaks I keep reminding myself just to do as many checks as I can to prove the part is defective before installing a new one, especially when the cost is significant. But still some times it is out of my knowledge to test them all. On the other hand thats where the excitement comes from, when you solve the issue not being confident in solving it! Thanks again!

[zenicashoop]

hello
i have citroen c4 1.6 hdi 2014 exclusive , which Eolys i have to use ?

[white exec]

Hi, and welcome to the Forum.
We drove from UK to Zadar (not that far from you) in 1986, with a 1975 Rover V8 and a large tent.
Some splendid memories of old Yugoslavia!

[Hell Razor5543]

hello
i have citroen c4 1.6 hdi 2014 exclusive , which Eolys i have to use ?

Hi, and to the Forum. If you post the VIN here (which will be automatically obscured so only Forum staff can read it) a Moderator can then look up your vehicle and tell you what the correct fluid is for you to use.

[imbradas]

The P1434 fault is sorted. I had bought a new additive tank, refilled and replaced. Although I still had an error code P1434. The issue was in the connector itself. Even though I have cleaned and tightened/squeezed the contacts before replacing the tank it was not enough. I had to really squeeze them again to make a good cconnection.

Now with all faults cleared. I still get the same warning on the dash: "Risk of particle filter clogging" and service light is on.

I have tried to do forced regeneration with DiagBox, with no luck. The regeneration starts and keeps the revs up to 4k for 5mins, then comes down to idle, and I do get the message in DiagBox, "Particle emission filter regeneration problem".

Any Ideas why regeneration could fail?
And do I get that service light and warning because of it? As I said, there are no more faults. I have tried regen., 3 times and I do get the same message every time at the end.

Thanks

[imbradas]

Althoug when I check PEF info, I get the following results.

Particle emission filter load: 0%
Volume of additive remaining in the reservoir: 2236 Ml
Avg. distance between regen., over last 5 cycles 128 km
Distance travelled since the last regen.: 0 km

[Hell Razor5543]

I believe that some forum members, on having to deal with a heavily clogged DPF, have had a good success rate by removing the DPF and soaking it in oven cleaner. Then they have run clean water through it, washing it until the water runs clean.

[GiveMeABreak]

Althoug when I check PEF info, I get the following results.

Particle emission filter load: 0%
Volume of additive remaining in the reservoir: 2236 Ml
Avg. distance between regen., over last 5 cycles 128 km
Distance travelled since the last regen.: 0 km

I’ll take a look for you shortly, I’m not at my system at the moment.

[imbradas]

Thanks. And I am pretty sure the PEF is clean, as I had it in pieces and shone light through one end. And all the mesh looked clean, no blocked holes etc...

[GiveMeABreak]

Ok, so when you replaced the additive tank:

1) Did you top it up with additive?
2) Did you prime the fuel additive circuit?