Xsara Picasso 1.6 Petrol - Fuel pump not running

[wheeler]

There is a 6 way connection near the fuel tank that the pump & sender wiring go through, does it change colour when it goes through here? According to the diagram this is the only interruption in the wire. It’s certainly not unusual for PSA wiring colours to change between one component and another.
If you backfeed pin 11 does the pump run?

[rubber_hammer]

I know there is a connector down underneath - I believe the wire feeding that is pink also. I'll check it again later, as I'm not home at the moment. It also gave a voltage reading when I checked it there. I probably should have tried a bulb on that connector too, actually - for good measure.

Can you confirm what you mean by back feed? Do you mean to apply power to the supply wire at the connector block on the fuse board from a different source? e.g. battery.

Many thanks!

[wheeler]

Yes that’s correct, ideally with a fuse in line (25 a should be fine. You can do it off the cars battery with a piece of wire. The positive jump post is located right next to the fuse box so this would be ideal for powering it.

[rubber_hammer]

Hi Wheeler, long story short, I've solved the issue. Big thanks for your help with that!

It was a bad connection on Pin 11. I pushed my pointy multimeter probe into it from the back so it was firmly wedged in there. The pressure must have pushed he connector onto the pin better. I've left the tip of the probe in there for now, but I'll need to sort a permanent fix.

Regarding the supply wire - I rechecked the 6-pin connector near the tank and, whilst it appeared pink, when the covering was pulled back, you could see it was more orange and it had the same code as the wire in the fuse board. That confirmed it was definitely the correct wire then.

I should have the other BSM unit arriving tomorrow. Might as well hang on to it.

Regarding the wires on the double relay - see image below. I tried to capture the wire codes as well as I could, but I could only get part of them. I'm not sure if they give you any clues. I think the yellow wire on the right has the numbers 50607 in view, but there are other numbers before the 5 (the pic doesn't show the 5).

Thanks again for your help. It definitely put me on the right track.

[wheeler]

Thats great news, i have never seen this on a picasso but on mk1 C5’s it is very common for this pin to overheat, you can normally see tell tale signs of melting on the plastic, worth a look. The next bit of good news is that Citroen actually sell those terminals in the connector separately, i have the part no written down at home somewhere. I dont know if the breaker will send the harness plugs still on the BSM, some of them just chop the harness.

[cit-rotti]

Citroen has an extra catalogue for many small parts.
But I only know the German link
https://public.servicebox-parts.com/dtt ... index.html
I'm sure this link is also available for other languages and it only has to be
de_DE must be exchanged for the other country code.

Greetings Wolfgang

[rubber_hammer]

Thats great news, i have never seen this on a picasso but on mk1 C5’s it is very common for this pin to overheat, you can normally see tell tale signs of melting on the plastic, worth a look. The next bit of good news is that Citroen actually sell those terminals in the connector separately, i have the part no written down at home somewhere. I dont know if the breaker will send the harness plugs still on the BSM, some of them just chop the harness.

Is there much involved in changing the terminals? Does the whole connector block need to be taken apart?

I didn't receive the connector blocks with the BSM, sadly. There were some pictured with them still attached, but I went for one that offered next day delivery - it's sod's law that I then fixed it before it arrived, but I'll take that. It was only £24, so will keep it - that way, I'll probably never need it! I have a spare copied ECU for the car as well.

[rubber_hammer]

Citroen has an extra catalogue for many small parts.
But I only know the German link
https://public.servicebox-parts.com/dtt ... index.html
I'm sure this link is also available for other languages and it only has to be
de_DE must be exchanged for the other country code.

Greetings Wolfgang

Thanks Wolfgang. Sadly, I couldn't find the English version of the website.

[wheeler]

My German isnt that good but i can read the pictures

[wheeler]

Number 60 but you will notice there are different sizes, that type of 16 way connector has 2 different sizes, if i remember right the outer ones are the smaller ones 6541E7 should do it.
You remove the red bit on the underside & you can carefully remove the terminals from the block individually, cut the old one off & crimp the new one on, may have to extend the wire as there is not usually a lot of slack.

[rubber_hammer]

Ok, thank you. I'll have a closer look at it over the weekend.

Appreciate your help - cheers!

[Paul-R]

Here's the page giving a list of all the languages:
https://public.servicebox-parts.com/dtt/AC/vis_doc/

So here's the French version:
https://public.servicebox-parts.com/dtt ... index.html

And here - ta-dah - is the English version:
https://public.servicebox-parts.com/dtt ... index.html