Citroen c5X7 suspension fault

[citroenx7]

Hi, I’m
New to the forum, and I apologise if this has already been asked on numerous occasions.

Front suspension dropped, then 1 day later rear. All fuses checked by mechanic(visible fuses and invisible). All fuses ok
next front hyrdraulic pump has power going to
It apparently but not the ECU. The mechanic is no Citroen specialist. He says replace the pump, and it will sort the problem.

Pumps hard to find (5277n9) and very expensive.

Is he missing something potentially obvious? I don’t know which diagnostic equip he uses to help him determine problem.

Some guidance will be appreciated.

Thanks

[citroenx7]

Hydractive 3+ suspension

[GiveMeABreak]

Is the pump operating / making a noise?

Check fuse G39 in the cabin fuse box.
Check Fuse F01 in the fuse box at the battery outlet.
Check the Supply Cut Off Relay (1524) as shown below:

[KennyW]

If pump is not running main fuse beside battery is probably blown. This is due to gung build up within the pump. Clean pump and renew fuse . Plenty of threads on the forum to show you what to do.

Kenny

[Hell Razor5543]

Underneath the main fuse box (in the engine bay) is a Maxi fuse box. It is a bit fiddly to get at, but the maxi fuse for the BHi has probably failed (because, as KennyW has said, of the conductive gunge that has built up). I had this happen to me last year.

[citroenx7]

I saw him check the main fuse and it wasn’t blown,

[citroenx7]

Pump making no noise, showing as no communication from suspension ECU. Power has been checked going into the ECU and fuses are fine.

There is power going in… but nothing out

[GiveMeABreak]

So that's likely what has happened. Your pump that site underneath the ECU has likely been contaminated with LDS fluid or other oils that get into the pump. This results in it mixing with the carbon brush material, which forms a sludge like paste and this then causes overheating / a short circuit and constantly blows the fuse. In bad cases it can damage the internals.

So I suspect you'll either need a new pump or will need to overhaul it and see if you can clean it up.

See my post here where you can see a wire has broken:

viewtopic.php?p=649588#p649588

Elis has also produced an excellent guide on removing the pump and cleaning it up with lots of step by step photos here:

viewtopic.php?t=60565

[citroenx7]

Update, apparently seal broke - fluid leaked and wiped out ECU and both pumps are covered in the fluid.

Can I retro fit a standard suspension into the car, ie Bilstein shocks/springs.

Or not possible… ?

I know it defeats the purpose of the(exclusive model).

[GiveMeABreak]

That won't help your Power Steering though - that is operated by the same fluid from the same system.....

The shocks and springs could be fitted, but there will be some differences IIRC and then there's the numerous faults you'll get until you can programme the BSI to remove the components. A lot of work and expense though that would probably cost more than a repair / replacement.

[KennyW]

Do you need a hydraulic pump ? I have a spare pump I bought a little while ago. Marc I'll find its part number can you check it would fit this X7

Kenny

[citroenx7]

Kenny I think I need 2 pumps mate. Front and maybe rear also

[citroenx7]

The part numbers which are suitable are as follows
5277n9
And 1680917280

2014 plate 2.0 hdi 16v(160bhp) saloon manual c5

Thanks

[GiveMeABreak]

There is only one pump for the whole system.

[Hell Razor5543]

The other pump may be for the power steering?