Multiplexed Diesel Additive Blending Pump??

[Billyerskine57]

Hello I’m a new member with a problem that has been ongoing for a few months! I’m not sure how to upload any image’s or where and if I can send Vin No.
Turn ignition on within 2 seconds the spanner light and engine light on with engine Adblue fault
P1434, P1435 & U0118
The Adblue pump has been replaced but the faults still present. Tried to carry out Adblue pump replacement say’s it’s done but still have faults and codes. It is a 2017 van with 127k someone say’s it problem has the Eolys system as well and that’s probably why the faults are on. How do I know it this is the case?
Please can someone help?

[GiveMeABreak]

There are 2 issues going on - both separate.

Your diagnostic screens are referring to the Eolys additive pump for the Diesel Particulate Filter. That is entirely separate from the Adblue Tank and the Selective Catalytic Reduction system (Adblue injection into the catalyst).

Why did you replace the Adblue Pump if the faults are referring to the DPF Additive pump? All 3 fault codes supplied refer to the Eolys Multiplexed additive pump, not the Adblue Tank / Pump.

You may well have a separate Adblue fault, but that is not showing up on the diagnostic screens you have supplied.

[Billyerskine57]

Hi Marc,

The only access to the Additive system is through the Engine ECU and refers to the Adblue but not Eolys or FAP system.
I wasn’t aware that both could be fitted to the same vehicle. That’s where the confusion is I’m not sure where the Eolys system ECU and tank are located or if they are present.

[GiveMeABreak]

Pop your VIN up (automasked on post submission) and I will tell you what you have. But most Blue HDi engines especially from your year have both systems fitted.

[Billyerskine57]

VF7**************[VIN obfuscated, can be read by forum staff]
It does have Eolys tank and this is what has been filled and replaced.
However I’m pretty sure the tank needs to be reset, the kit I have Texa and Delphi have both said it’s done but codes will not clear??

[GiveMeABreak]

That's the Eolys tank for the DPF additive, not the Adblue tank. If you have replaced this it may need the multiplexed pump properly configuring which your third party diagnostics may not be capable of doing. Later vehicles often require the configuration to be completed via PSA servers in connected mode as they are secured. So may need a dealer visit to complete.

[RichardW]

This has both ADBlue and Eolys. The faults you have are related to the Eolys. What does it actually day on the screen when the error pops up?
If you have tried to re-program the AdBlue tank, then that will be why it hasn't work - can you go into replacement items and Diesel Particulate Filter pump replacement or something? Although it looks to me a bit like there might be a wiring fault as there are no coms, rather than just a configuration error. As Marc says aftermarket diag kit doesn't always work on the non engine ECUs.

[Billyerskine57]

Hi Richard, Marc,
A bit of development on the problem.
After removing the tank I did a continuity check of the wiring to the Eolys tank to the connector behind the passenger sill trim. There is a 12v supply & earth to the outer 2 pins. The center connector pin has a 9.5v which I find a bit of an odd value?
I carried out a check of all the systems and have now found a couple of faults in the body computer relating to the additive pump communication.
I suspect that the body ECU, engine ECU and additive pump are not communicating with each other. I’m convinced that the body ECU wiring/connector or supply is more than likely to be the cause of the fault.
I don’t suppose there’s any wiring information available to identify the connection between these 3 systems?
1) where do the 3 wires, blue, red & green/yellow at the additive pump receive its information from?
2) where does the body computer fit in? I assume as some sort of gateway between the additive pump and engine ECU?
3) I need to identify the connectors, fuses and wiring of the body ECU?
I am searching the web but without much luck.
Any assistance is greatly appreciated

[GiveMeABreak]

I can't help you with this one Billy as I don't have anything specifically for the Dispatch 4 or this engine.

[wheeler]

Your pin 2 is the LIN connection so that may explain the strange readings. This wire should go to pin 35 of the 60 way black on the BSI

[wheeler]

Here are the fault descriptors

[Billyerskine57]

Wheeler,
Thank you so much this is just what I was after!
I spent so many hour’s on the web searching.
Thanks again everyone who’s been helping, I’ll keep you all posted next week

[Craighud]

Billy

did you sort this problem?

[Groom1983]

What was the outcome on this Multiplexed pump

[Chapster3383]

Has anyone else had the problem with this multiplexed pump I’ve just changed my tank and can’t prime it now with my Topdon 600s where as I could prime the old tank until it gave up and no more clicking anyone know if there’s a dedicated fuse for this tank?