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Posted

Hi guys,

Once again the c5 has me stumped.

Last week driving home the car went into limp mode. No warning lights, nothing.

Just wouldn't rev over 2k. All of a sudden she sprang to life and was fine.

One week later and I noticed that she was hunting ( old mechanics will know this ). She seemed to drop power and then regain in a rhythmical motion. Revs didn't drop and speed was steady throughout all this.

Stopped at a shop on the way home and once again she went into limp mode. No lights warnings etc.

And once again she picked up and was fine.

I've now become so fed up with the car that its up for sale. We live in a rural area with no public transport and I just cant trust it anymore.

Posted

In case others may be able to help, your car is a 2001 2.2 hdi C5.

 

I can understand you wishing to change the car, apart from the bother, it could cost far more than it is worth to sort it out and you have already had to fix quite a bit. May be the diesel is a bad batch or has some water in it. Does the engine management light come on when first starting the car to show that the bulb is working ?

Posted

Hi Paul,

Everything works just as it should. All bulbs ok.

I really don't know where to start with this one. Maybe a complete reset is needed.

Don't suppose it could hurt to try.

Posted

Unfortunately no. We live in a very rural area and unfortunately the nearest dealer is over 50 miles away. If I had any intention of keeping the car I would invest in a lexia and a cheap laptop.

I put fuel in today from a non supermarket pump and half a bottle of redex. She seemed to run a little smoother until I accelerated away from a roundabout and she cut out completely. Waited a min and she started up with the antipollution fault message, engine management and service light on. Drove the 15 mile home without anymore mishaps.

I think I'll be getting my Toyota estima back on the road. The old bus never let us down. Until I lost control on ice and hit a dry stone wall.

Posted

Parkesie's recommendation of replacing the fuel filter would be a good one to start with unless it has been replaced recently. I have read on here that performance can be limited if it blocks and you may get low fuel pressure fault codes. From Eurocarparts a new fuel filter is £5 to £10 depending on the make.

Posted

Fuel filter AND housing changed 2 weeks ago

Bled it through to the injectors just in case.

Strange this is... This morning the anti pollution warning came on. Engine management and service light on.

Started the car at work this evening and drove 150 yards to the supermarket. Got back in the car after 5 mins and no lights or warnings.

Smooth 15 mile drive home although I was expecting the dreaded ping of the warning or complete stall.

But no, nothing at all.

Long may it continue

  • 8 months later...
  • 2 months later...
Posted (edited)

Ok, I have random "Anti-Pollution" and EML + Service lights which come on.  Sometimes goes into Limp mode, sometimes not.  And EML lights do go out all on there own, completely random, when there out I cannot make them come on.  Then when they do come on its at random times.


 


Now I have purchased a Lexia Kit, running on Windows XP Home 32-bit, I ran Lexia3 V358.01 and scanned for faults in all areas one at a time.  Below I will list what I have come across so far:


 


In the Injection area, P0110 Permanent Fault, Inlet air temperature signal.   CAN value not plausible.


                                  P0402 Permanent Fault, Fault: Air Circuit.  Amount of air measured lower than the setting


                                  P0235 Temporary Fault, Turbo pressure signal.  Short circuit to positive or open circuit or value too high


                                  P0245 Temporary Fault, Turbo pressure.  Turbo pressure measured too high


                                  P0191 Temporary Fault,  Fuel pressure regulator / sensor consistency.  Consistency between fuel regulator current and pressure


And another which I forgot to get the code: Temporary Fault,  Cat. converter upstream temperature signal (cat 1).  Short circuit to + or open circuit


 


 


I have bashed out the Cat/DPF + deleted the system using ECUSAFE and a Galletto cable.  However im wondering if this has got anything to do with this issue?


 


Can anyone shed any light on this one?


 


The car is a 2001 Citroen C5 2.2HDI Exclusive.


 


Thanks


 


Mike


Edited by TheGoose
  • 8 months later...
Posted

If you use your Lexia to see live data you should be able to see what temperature the AIT (or IAT) is showing. Before starting with a cold engine it should be the outside temperature of about 10 to 20°C but after a while it may go up as the engine bay warms up but around 30°C might be a maximum. If it is showing anything different then check its connections/wiring but it may need replacing.

 

It also looks as if the MAF (air flow sensor) could be faulty. Sometimes these can be cleaned internally with a carburettor spray. These also sometimes include the AIT sensor and looking at a photo from our previous 2004 C5 2.2 hdi, the sensor John has pointed out is not where John has shown. The MAF is on the engine side of the air filter. Also check its connector and wiring.

 

Once these are sorted I would then check again for fault codes since it is possible they are related.

Posted

 

Also what is the AIT sensor?

It's the air inlet temperature sensor. It's marked with a red arrow.

 

Hi johndouglas. That pic isnt the same engine as mine, but i looked at my maf or map sensor in the airbox assembly and there is two sensors in there?

Posted

If you use your Lexia to see live data you should be able to see what temperature the AIT (or IAT) is showing. Before starting with a cold engine it should be the outside temperature of about 10 to 20°C but after a while it may go up as the engine bay warms up but around 30°C might be a maximum. If it is showing anything different then check its connections/wiring but it may need replacing.

 

It also looks as if the MAF (air flow sensor) could be faulty. Sometimes these can be cleaned internally with a carburettor spray. These also sometimes include the AIT sensor and looking at a photo from our previous 2004 C5 2.2 hdi, the sensor John has pointed out is not where John has shown. The MAF is on the engine side of the air filter. Also check its connector and wiring.

 

Once these are sorted I would then check again for fault codes since it is possible they are related.

Hi coastline, many thanks for this. So could i assume that on my engine (2001) that both the ait and maf sensors are located on the engine side of the airbox assembly? Or is it likely to be else where?

Posted

goose if you give me the number of you mass airflow il see if ive got one i can pop in the post for you. If you can screenshot live data and post on here one.   need one with engine cold and ticking over then at 3000rpm. second one with engine at normal temp again ticking over and another at 3000rpm. so thats 4 shots in total. What part of the uk are you

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