C5 suspension won't move

[Jerome3]

Just turned car on without bleeding just to c if it would work without bleeding but suspension never moved pump worked though

[myglaren]

If the motor runs with no rise in the suspension I would imagine it needs priming and bleeding.
Running it unprimed may well damage it.

[Jerome3]

Don't suppose anyone has a photo of front suspension sensor can't seem to find it suspension still won't lift
Jerome

[cachaciero]

Definitely ONLY LDS - it does say on the reservoir!

There are bleed valves under the car, cachaciero has mentioned this in other threads, can't say where they are as my car isn't here right now.

Yes, to prime the pump you will need to pressurise the reservoir.

Citroen insist that only LDS will do however LHM is almost as good and a lot cheaper. The LDS V LHM issues have been discussed various times on this forum but in summary LDS and LHM are hydraulically made to the same spec the only difference is that LDS is a totally synthetic oil where LHM is a mineral / synthetic mix.

Pump priming if you have a brake bleeding tool that uses air pressure to force brake fluid through the system e.g Gunson the cap that goes on the master cylinder also fits the LDS filler so you can use the same piece of kit the same way to pressurise the reservoir

Not a 100% sure where the bleed screws are on a Hydractive 3 system but follow the pressure line back from a strut and you will find that it goes to a manifol block which has three pipes going into it the bleed screw will be on the manifold.

cachaciero

[Jerome3]

Got the pump in and primed now works fine thanx to all on this forum just now need to get the rear lowered a bit with a lexia she's sitting a bit high 450mm from centre of hub front sts about 400mm from centre of hub is there a factory height setting for caret height?

[romeo]

where exactly is the maxi fuse, and the sensors located on the car?

[myglaren]

Behind the battery is the main fuse box. You need to disconnect it (follow the disconnect/reconnect procedure).
Carefully unclip the fusebox and lift the front, there is a row of Maxi fuses. Check for which is blown (if any) and replace.

My handbook does not indicate which is the relevant fuse unfortunately, as they should only be accessed by a trained Citroen mechanic

The height sensors are attached to the anti roll bars front and rear. Note that a very small adjustment to them produces a pronounced difference in the ride height.

[myglaren]

Further to that but most probably not necessary is the location of the LDS reservoir.

[colin machin]

If it's low and the pump doesn't run then it's probably the Maxi Fuse (under the injection ECU) that supplies the pump motor a relatively common failure.

cachaciero

thanks very good advice very much appreciated

[colin machin]

Fuse 8, 40 Amps.

thanks for taking the time to put photos on i would never have found that one if i had seen that 3days ago i would have saved a lot of time and trouble .

[Gazzaman22]

Hi Guys, Looking for a bit of info if you can spare a few mins
What is the connection i have pointed to and what does it connect to? Could unplugging this connection while the engine was running cause a that maxi fuse to blow resulting in a lowered suspension?
I'm in dispute with a garage who was changing a light bulb(tank side) who ended up somehow blowing the maxi fuse and not being able to fix, i then had to take it to a different garage.

[GiveMeABreak]

That connection is for the BHI (Electrohydraulic pump and ECU) for the suspension. It provides both the electrical power for the pump, but also the ECU which talks to the BSI and the other systems.

It is never a good idea to unplug the ECU when the car is running - this could brick the ECU as it it could leave it undefined state. On these cars, they have complex computer networks that should be allowed to go to 'sleep' before disconnecting them. That usually entails closing the car doors and tailgate, leaving the bonnet up, waiting 5 minutes or so, then disconnecting the battery negative. That will allow the ECUs and the network to power down and sleep before undertaking any work. I say disconnect the battery negative, as the suspension motor still operates after the engine is switched off.

If the ECU / motor has been disconnected from the power whilst running (bearing in mind what I said above) it can easily cause a problem - as will connecting it back up if the car is running.

You may need to get it diagnosed with a Lexia to find out what the faults are recorded as to troubleshoot.

[Gazzaman22]

Thanks Marc, I had to get it diagnosed at a second garage as the first guy got annoyed at me for telling him that he caused the problem, Car was fine going in, and blown fuse coming out. He maintained that it was a new issue that presented. I seen him as he was trying to make space and that side of the car undo nuts of the tank and remove cables, i'm convinced he pulled the plug on that unit, to make space to get his hand in there to get bulb out.
I've now a bill for 200 just to get that maxi fuse replaced...Any advice?
Thanks

[GiveMeABreak]

Well the maxi fuse has blown for a reason - it really is worth finding out if there is another reason why it blew in the first place.

Relevant Maxi Fuses on a 2005 C5 MK II:
MF7 70A power steering electropump unit (Engines EW10A (RFJ) - DW10BTED4 (RHR))
MF8 40A central electronic block motor

Maxi Fuses:

[wurlycorner]

Yeah definitely not a good idea to unplug that with everything running!
Only cause I could think of for blowing the Maxi fuse in so doing though, is a flash over with the plug partiality connected/disconnected? In which case evidence of that should be visible on the plug/pump socket connections?
I would say hard to prove this is fault if the first mechanic though...