Diesel additive pump

[Jonathan coughlan]

Hi folks .First time posting here , hoping someone can point me in the right direction . Just before Christmas got a warning ight after filling my berlingo with diesel. Faults pointed to faulty diesel additive pump .got a new after market pump put in by my mechanic .he cleared all fault codes .following day i Put diesel in and up came warning light again .Brought back to my mechanic .same codes as before regarding addivtive pump . He recommended I bring to main dealer which I did .they reprogrammed the new pump .went to garage straight away to put some diesel in and up came the warning light again .the following day I was driving for approx 5 min and got a message about particle filter at risk of clogging and went into limp mode .any help would be greatly appreciated.

[GiveMeABreak]

That means the particle filter is deemed to be getting full and runs the risk of being unable to regenerate. Short journeys without letting the vehicle get to temperature and constantly switching off the engine will interrupt any attempt to regenerate the filter. You need to go for a spritely run for 30 minutes or so and let the car get to temperature, stay in fourth gear and keep it at 40-50 MPH to allow the filter to regenerate.

Repeated failures to regenerate can result in permanent blockage of the filter (anything 75% full or over), requiring the particle filter to be replaced or deep cleaned.

You haven't mentioned your vehicle mileage, as depending on that, it may be towards end of service life in which case the same applies:- deep clean or replace.

[Jonathan coughlan]

Thanks for the reply but have you any idea why my eolys pump kept throwing up the error code when I refilled my van with diesel even after I put a new pump and tank in .it was a on going issue for 3 months and the risk of clogging the dfp only came up 2 days ago .

[Jonathan coughlan]

Mileage 164000 km

[GiveMeABreak]

Without the VIN, I'm assuming you have a 1.6 HDi engine here; that being the case the expected life of the filter is 160k KMs / 100K Miles. Of course this will vary based on driving conditions, but this is the official life expectancy.

[Jonathan coughlan]

Thanks for your help .what I'm worried about is if I get my dpf deep cleaned I still have the problem of my new additve pump not working and adding the eoyl fluid when I put diesel in my car .hope I'm making sense

[Jonathan coughlan]

The error codes are 1434 1435

[GiveMeABreak]

..and the VIN please when you can.

Those 2 faults (without the VIN for cross reference) can mean (along with code FEB4) can mean an additive supply problem.

If this is the case, then the additive pump may not be dosing the fuel tank. Hence why you may be getting the warning every time you add fuel - as this is when the additive pump will inject Eolys into the fuel tank, but may be unable to if it's not working, which the fault codes suggest.

If this is the scenario, then it means there is no additive being injected into the fuel tank and that means the vehicle's exhaust gas temperatures have to reach at least 550 °C for passive regeneration to take place, instead of the 450 °C that is required for assisted regeneration.

So this is likely why you are getting the risk of clogging warning as a consequence.

Be very careful, because the longer you use the vehicle, the quicker the filter is going to fill and without it being able to regenerate it is going to compound your problem.

Either the additive tank is was not primed or the engine ECU was not told it has been replaced, or it is not working because of the electrical supply or wiring connections from the additive tank pump tot he engine ECU along the harness somewhere. We have seen this several times where there was a break or corrosion in the wiring going back from the pump.

[Jonathan coughlan]

Ya see I got a new pump and it has been primed twice by my local mechanic and also I brought it to the main dealer so I'm thinking as you say it must be some wiring connection .thank you for your help .I'm on the verge of getting the whole lot taken out

[GiveMeABreak]

I understand the frustration, but wouldn't advise you do that as it's illegal and you could be in the soup. It needs the circuit testing back from the additive pump as it may only be a wiring issue or connector issue / pin.

[Jonathan coughlan]

Thank you so much for your help.much appreciated

[Gibbo2286]

Excuse me butting in on your tech thread Jonathon, just like to say my maternal great grandparents were Coughlins from Cork.

[Stickyfinger]

With my C5's there was a section in LEXIA that would test the doser pump, you could hear it clicking....

[GiveMeABreak]

I suppose it depends on how well you get on with and trust your mechanics as to whether they've done this or not and not mentioned it. As Alasdair says, there are live tests you can do that will determine if the pump is operating or not. If not, that again confirms that it's likely to be an electrical or comms fault from the pump to the engine ECU if this is already a new additive tank.

[Jonathan coughlan]

I was there when the mechanic plugged in his comp and primed the pump the 2nd time .you could hear it clicking . Could it still be an electrical fault if the clicking noise was heard