Pain In The Rear End C5 Grrrr

[phil734]

Hi there please please please

could anyone possibly help me out

or have any ideas?

suddenly developed and intermitant

esp/asr fault, which aslo brings in abs fault.

can anyone give me a idea where to start what to look for

the car is a 2009 1.6 hdi c5

22,000 miles.

trying to avoid citroen dealers cos of the cost

but if I have too then dealers it is :(

Phil

[paul.h]

Welcome to the forum.

These are all speed related so it could be a problem with one of the wheel abs sensors or may be the brake light switch. You could have a look at these but a dealer diagnostic check will tell you what is wrong without trial and error part replacement.

[Randombloke]

You could look at the cost of buying the diagnostic kit to plug in, then you see the investment the dealers are trying to recoup.

 

If you post a rough location, then forum members may suggest reliable independents who can help you.

 

Worth checking that all the wires/connectors around the ABS sensors are tight and undamaged.

[phil734]

Thank you for your help and ideas, im from morecambe in lancashire.

have checked all the wires and nothing appears to be damaged or loose

did find broken brake pad wear cable which as been repaired and also

found near side brake wear sensore cable was discconected, but still the 

fault keeps croping up, but only under braking.

[Roger W]

I had a similar problem on my 09 C5 2.0 hdi VTR Tourer. Under warranty the central brake balancing 'box' was replaced, and then again on a recall. It used to show all the warning lights and then mysteriously reset itself until the next time! After the second change it never reappeared.

[paul.h]

On the General Discussions and Nonsense pages, there is a link to a Citroen recall site where can do a one off check and see if your car has had this brake recall.

[phil734]

Today had diagnostic unit plugged into the grrr useless car

no fault code or fault found in any normal places, but when looking

at the esp/asr/abs computer it showed brake pressure as being 110bar?

mmmmm pretty impossible on a braking system, maybe a jumbo perhaps

but not on a car, mechanic still cratching his head 5 hrs later, any ideas

or any iseas how much a abs brake pump may cost?

[Randombloke]

Today had diagnostic unit plugged into the grrr useless car

no fault code or fault found in any normal places, but when looking

at the esp/asr/abs computer it showed brake pressure as being 110bar?

mmmmm pretty impossible on a braking system, maybe a jumbo perhaps

but not on a car, mechanic still cratching his head 5 hrs later, any ideas

or any iseas how much a abs brake pump may cost?

 

It may be that whatever measures brake pressure is faulty. Diagnostics need interpretation.

[paul.h]

If you do need a new hydraulic block, it will need calibrating as well as a few other associated bits so a dealer visit will be needed or somebody else with the correct diagnostic equipment. We had to have this done on a C4 that needed a new one after accident damage and the repairer did not have the equipment to do it.

It is hard to imagine how there would be any pressure in the brakes if they were not being used unless the diagnostics ran the abs pump and actuated the hydraulic valves.

[phil734]

today discoverd that the fault only occurs when ambient temperature goes above 21deg

mmmm, now that may have put a spanner in the works to what it may be????

[paul.h]

Was the diagnostic check done by a Citroen dealer ?

At least only showing up when it is above 21°C, it will not occur again this year.

[phil734]

diagnostic's performed by the main dealer and charged me a arm and a leg and a lung

there was no fault code only that that the esr/abs had stored a fault. well summer is over with

so wont happen again

[phil734]

problem gone away on it's own :) weird but not complaining

but air con compressor not working now, and just wondering

if anyone knows where the clutch relay is for the compressor

Regards Phil

[paul.h]

Was the air con giving cold air before or just a bit cold ? - just in case it needs regassing and the amount left is not enough to give sufficient pressure for the compressor to run. A regas is about £50 at a dealer and includes a vacuum/pressure test for leaks. Also the cabin fan needs to be running for the air con to work.

 

From the Citroen manual, things to check if the air con compressor clutch does not engage or disengages quickly:-

- compressor clutch

- lack of refrigerant

- air con pressure switch (on the condenser matrix at the front of the car) - check the connector but to replace will need the refrigerant removing/replacing.

- air con evaporator temperature sensor

- electrical circuit (connectors, wiring , fuses, etc). Any relay is most likely to be in the engine fuse box.