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25K views 25 replies 6 participants last post by  somervillearron14 
#1 ·
Hi All,

I have recently purchased a 2009 Scenic 1.5dci 106bhp. When driving uphill or on motorway in 5th gear around 70mph the car becomes jittery/shaky and two error messages appear the check injection and check emission control. Also the car feels a little bit sluggish. Another sympthome is there seem to be a whistling noise from low revs. about 900-950rpm and mpg is lower than it should be. If i clear the code, it reappears again as soon as the above driving conditions are repeated.
Connected the car to an obd scanner which returned codes p0234 - Engine overboost condition and p0380 - Glow plug/heater CKT A malfunction.
On a dtc scan in a garage the following codes appeared dtc226321 BOOST Pressure Circuit 1.DEF and dtc1525F3 Consistent Multiple Signals For CC/SL DEF.

I have so far checked the glow plugs with multimeter, MAF sensor, cleaned the EGR valve and checked the vacuum valve. The vacuum valve seems to be producing vacuum, h
owever, shouldnt the valve stop producing vacuum at certain rpm? Please advise.
I am now thinking about removing the turbo tocheck the wastegate valve operating correctly - is there a way to do this without removing the turbo? am not sure I can get hold of a new gasket for the turbo o can the old one be reused?

Could the above issues be due to a bad remap? Any suggestions welcome on what else could cause the above issues.

Thank you
 
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#3 ·
Hi I have checked the pipes running from turbo across top of engine - these are held by retaining clips, not sure how to determine whether loose or not. This pipe runs to the front of the car - any idea where does it go from there and how to check?
 
#4 ·
Dont know the exact route it takes but it goes to the front as the intercooler
is there then back to the engine, any leaks in those pipes often cause a whistling
noise.
 
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#5 ·
I am going to check the return pipe out. Personally, i think the whistle is there too soon, due to the turbo overboosting.

If I take the turbo off to inspect the wastgate valve, do I need to use a new gasket when putting it back together? I cannot find a place selling the gaskets separately.
Thanks
 
#6 ·
I could be wrong but I would not expect the turbo could overboost at such
low revs, can you not see if the wastegate is free to move without removing
the turbo? but if you disconnect the linkages make sure you can replace then
with the same adjustment, I would replace the gaskets you may get away with
it depending on type but any leaks and you will loos boost and make a mess
due to diesel fumes, could this be the gasket you need?

Turbo Gasket Kit Renault / Nissan / Suzuki 1.5DCI 82HP-60KW 54359700000 / 2 / 8 | eBay
 
#7 ·
Hi

That is not exatly the right gasket it, but managed to find one in their store - thanks Ralph.

The wastgate is in such an awkward position, that I might no be able to get to it - but will try today or tomorrow.

I have a printout from dtc diagnostic saying that boost pressure reference value is 2567mbar, while the actual boost pressure on the car is 3033mbar, basically some 400mbar overboost and all this at 798rpm.
 
#8 ·
Is it showing over boost on tickover with no throttle applied?
under those conditions my dci 80 would be showing about
15 psi about 1040 mb roughly atmospheric pressure if you have
the kit try reading it with engine stopped if it is over atmospheric
then it is very likely to be the sensor as the turbo wont be turning.
I suspect the sensor rather than the turbo or it's wastegate but this
is only a guess going off your post.
 
#9 ·
Hi Ralph, I dont have the equipment unfortunately - the reading was done by a garage. Which sensor you think could be faulty - could you please describe the location accurately as people keep calling the same sensor differently. If I find it will try to test it somehow.
 
#10 ·
This is whats fitted to my dci 80 but you need to check as yours is a 105
on the 80 it is fitted under the right hand edge of the air filter again you
need to check as there seems to be differing setups on many cars.

Renault Clio 3 1.5 dci 68 86hp Mass air pressure sensor MAP 8200168253 05-09 UBL

It calls it a Mass air pressure sensor MAP but I always thought
mine was a absolute air pressure sensor but it could
just be another name for the same thing.
 
#11 ·
Hi, I have already checked this. We also have an older 2005 scenic 1.5dci 86bhp and swapped the sensors around and cannot notice any difference on any of the two cars. It looks like that I will have to try and check the wastegate. First Iam going to test another sensor which is on the pipe between the air filter and turbo, and tomorrow will look at the wastegate. Will keep you posted.
 
#13 ·
Hi Ralph, do you happen to know how the vacuum valve should work? I was under impression that when you increase rpm the turbo turns on, and at some point the vacuum valve stops providing vacuum and instead it provides pressure which than opens the wastgate valve - am I missing something here?
 
#15 · (Edited)
Mine does not work like that, the wastegate is closed so you get what ever
the turbo can supply until it hits the limit at around 32 psi it then opens
by turbo pressure to bypass the turbo and limit boost there is only a pressure
line to mine no vacuum though others have said theirs were like you describe
mine is not the same. the 32 psi includes atmospheric pressure so it's about
18 psi of boost.
If you give it some stick it winds up to 32 lb ish very fast
then sits there wile the engine just keeps winding up
you have to watch it in 1st and 2nd if it's wet or slippy
or it will spin up.
Mine is in a Clio by the way same basic engine but
different plumbing.
 
#17 ·
I think yours will have a variable geometry turbo so will be a bit more
complicated than mine but do check that you can set any adjustments
back were they were if disturbing them.
 
#18 ·
Update:
Since my last post the following happened. I took off the vacuum valve and took it apart to clean it, however when in pieces everything seemed to be working as it should.
I have put it back on the car today, took it to a test drive. The same fault message s appeared on the dash e.g. check injection and check emission control, however when I done a scan only the P0234 was shown, and the P0380 did not reappear.

Another interesting thing is, that I have left the airfilter box slightly open, so the turbo can breathe better. Cleared the remaining fault code and took the car on a test drive. The car has started jittering/hasitating the same way, however no fault codes or warning messages appeared after the test drive.

I am not sure, where to go from here. No error codes appearing at the moment (with air filter box not closed entirely), but the issue still persists e.g. the car hesitates when worked hard.
I wonder whether this could happen due to overfuelling.....
 
#21 ·
Its hard for us to understand same conditions,
does the car start ok in the morning ,, especially now its colder..
Lots of things will give issues, but at what speed/revs..
If you give a bit more info..
OR really better still start your own thread..
To start your own thread,
Look at new posts, and click on the right hand side of the screen, on something like engines , this will give you a tab that will say New Thread..
Go from there, you will get more replies
 
#26 ·
Old post I know but just for anyone

It's a good idea to look at the pipes down at the Intercooler each of ours where covered in sooty stuff the jubilee clamps where tight but I wouldn't say enough


It's always a good idea to clean each pipe loosen clips reseat and tighten well as due to a lot of miles etc things can move around, especially if you see marking like soot near the clamps it points to this

But the reason to clean the whole boost pipe is so you can check again for soot etc which would point to a leak and also will allow you to see any cracks

Also If you can't find a boost leak but you think there is one get some washing up liquid coat the pipe and have someone rev the car check for bubbling
 
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