P1434 P1435 Eolys pump error codes

[TheCook]

Hi all,

After much research and fiddling around I've come here for some help and ideas. My 2011 Berlingo Mutlispace has been flashing the "Engine Fault" and "Risk of filter clogging" messages. After borrowing my friends Solus Ultra, I got P1434, P1435 and 0EB3 error codes, which all pertain to the diesel additive pump.

Dismounted the additive tank (part number 9672052180) from the car and found it completely empty, I know it was refilled less than 20k miles ago from the papers I inherited when I bought the car. So far so strange, the additive should last a lot longer than that. I took out the small pump (part number 2980 030 0001) and hooked it up directly to the car battery to test if it functions, it sounded clogged and didn't run.

Bought a bottle of additive to refill the tank and a new tank, after fitting this I reset the additive level and communicated that I had replaced the tank and additive liquid to the car through the OBD. Exact same fault codes show up

I then disconnected the three pin electrical connector that goes onto the tank and tested the pins for voltage with the engine running. The central pin (which is the LIN connector) has a steady 11.5V. As far as I've been able to test with my less than perfect setup and subpar electrical know how, the two pins on either side have no voltage running through them; I found a function to test the electrical circuit of the additive pump and even when running that test the voltage showed as near 0.

The fact that the additive tank was emptied in less than 20k miles indicates that at some point in the near past the pump (and hence electrical input to it) was functioning, and yet it doesn't now. If the tank wasn't empty I'd suspect a wiring fault somewhere along the line, but somehow the connection was functional enough to empty the tank and then stopped working? Any help or ideas are appreciated.

[mickthemaverick]

Two thoughts occurred to me reading your post. Firstly in view of the rapid loss of fluid is it possible that the old tank had a leak? Secondly as well as programming the new tank and fluid levels did you also clear the codes?

[TheCook]

I thought the same initially regarding a leak, filled up the old tank and checked back in a day later and no leaking to be seen. My current theory is that whoever topped it up last time could've only filled it partially but told the ECU that the tank was filled up all the way (there's no sensor inside the tank, it relies on you telling it how much fluid is in there), once the tank ran dry the pump would've kept pumping dry and possible broken this way.

As for the codes, once I told the ECU I had replaced the tank and filled it with additive I went into the engine management menu and cleared the codes there, as well as the codes that was flagging up in the BSI menu. Comes back almost immediately.

Going to restart the BSI and take it out for a drive tomorrow and fuel up, the conditions for the fault to clear are to add 10L of fuel and drive 5min with the engine hot.

[Rp0thejester]

Eolys is always a difficult thing. I've learnt this over the past few years on here. The diesel cap has magnets which apparently tell the eolys to pump in but if it's not a full fuel tank then it puts to much in, hence running dry. If I'm wrong on this then please correct me. Everyday is a school day.