Omega Owners Forum
Chat Area => General Car Chat => Topic started by: Webby the Bear on 11 October 2014, 12:44:40
-
Hi guys,
Just put the code reader on the wife's dad's Passat (engine code AJM). Got the following:
(http://i1226.photobucket.com/albums/ee402/webbybear1/vwpassatcodes_zps4d526fa1.jpg) (http://s1226.photobucket.com/user/webbybear1/media/vwpassatcodes_zps4d526fa1.jpg.html)
A quick Google search has thrown up some interesting replies.... one is checking vacuum hoses... I checked them manually and cant find any issues. Another thread says N75 valve is fekked.
Os, the MAF code.... new MAF?
Anyone know? :)
-
Try cleaning maf 1st and see if that helps :y
And clear codes before refitting it.
-
Thanks Martin, will do :y
Got a feeling its the top code that's the real problem. Note the car has ZERO power lol
Should I also pop that front hose off to geta look at the turbo...
(http://i1226.photobucket.com/albums/ee402/webbybear1/vwturbo_zps90f6284d.jpg) (http://s1226.photobucket.com/user/webbybear1/media/vwturbo_zps90f6284d.jpg.html)
-
Are them vacum hoses braided rubber?
-
I think they're braided. They're not the normal rubber oneslike on the omega
-
They may look ok,but for the age of the car i would replace them with silicone :y
-
ok thanks mate. for the sake of a few pence I may just do that :y
looking at the articles on the internet ive got a feeling it may be this n75 valve. but obviously need to confirm that cos I think its quite expemsive
-
http://www.vwt4forum.co.uk/showthread.php?t=87750
-
Thanks Martin.
Here's the bad boy in question...
(http://i1226.photobucket.com/albums/ee402/webbybear1/vwpassatn75_zpsc9a13865.jpg) (http://s1226.photobucket.com/user/webbybear1/media/vwpassatn75_zpsc9a13865.jpg.html)
Got 37 ohms resistance and got supply voltage. The link doesn't list the spec of the AJM engine code but I'm assuming I have the higher resistance one.
Am I right in thinking that these can fail even if the resistance is correct? And that failure comes down to a clogged turbo vane(s) thus I should still check the turbo itself.
One oddity I found was that where one of the braided lines from the N75 clips to the plastic retainer it seems quite worn (but no notable holes). I squeezed this with engine running and engine note changes.
-
Change that pipe then,and then see if it does the same after.
-
Thanks Martin.
Here's a gret reply from someone off one of the forums...
04 1.9tdi fault codes + loss of power until engine - puggered
engine management light on again, fault codes read (manufacturers)
18062 electronic instrument panel p1654 intermittent
17957 control valve boost pressure - n75 open circuit / short with ground. p1549 intermittent
18080 cooling fan control 1 open circuit / short with ground p1672 intermittent
19586 egr system control range exceeded p3130 intermittent
17964 turbo pressure control - control limit below minimal level p1556 intermittent
Like Reply to this message | Report message as offensive | Link
Tue 3 Jun 2008 18:24 Back Top End
04 1.9tdi fault codes + loss of power until engine - Screwloose
That's better. There's my old friend 17964. [Him and his mate '965 make the trade millions.]
As suggested; start with the turbo wastegate vacuum solenoid. It should read about 14-20 Ohms across the terminals. If it doesn't - bin it. If it does - check the wiring.
Then check the operation and cleanliness of the EGR valve - could be stuck open and venting boost pressure.
The instrument pod one is a "reflection" code; check the real one in the pod's own memory - could be the oil level sensor; if so, check the bonnet catch switch isn't adrift.
After fixing all those; [the cooling fan isn't part of the limp-home, but check it and it's relay anyway] re-try it and hope 17964 has gone - if it returns, it'll likely need the turbo actuator checking for stiffness, or the turbo off and the vanes cleaning - don't fit an exchange turbo.
-
In short I think I should be checking that turbo also...
-
If that hose makes a noise when you squeeze it, it has a hole in it.
Change it.
Then report back.
Simples :-*
If the vacuum system doesn't work properly, then the sensors won't work accurately because they can't tell what is happening.
-
Another thing you can try Webby before you get stuck too far in is to disconnect maff sensor and drives the car,it'll run a lot better without it than it will with a breaked one connected,thatwill throw a code up which you delete with yer tool :y
-
Thanks guys!
I'm sure I have some thin diameter vacuum line knocking around.
I'll also disconnect MAF and see what I get :y
-
Have you checked the actual rubber turbo hoses?
Had that code when the vehicle "popped" the large turbo hose by the alternator (below the fuel filter, which was the cause)
There`s two sensors, if there`s a pressure difference between the two ( a big hole in the pipe which doesn't always make a noise) then it will throw that code.
-
Update.
MAF sensor unplugged. Car now flies :) :) :) :)
Oddly though the CEL didn't come on when driven :-\
I've cleaned it thoroughly with contact cleaner. Going to recommend a new one if it doesn't drive well with it plugged back in.
Could he drive round with it disconnected until he can afford a new one? I presume with no MAF reading the engine reverts to a default setting? :-\
-
Have you connected maf back up now its clean?
-
Have you connected maf back up now its clean?
Yes mate. Going to give it 20 mins for the contact cleaner to evaporate and give it a test run :y
-
Pps, been looking in to this VNT (due to me only knowing the basics I assumed all turbos had wastegates).
in this pic...
(http://i1226.photobucket.com/albums/ee402/webbybear1/vntactuator_zps9972a296.jpg) (http://s1226.photobucket.com/user/webbybear1/media/vntactuator_zps9972a296.jpg.html)
...is the round silver diaphragm looking thing on top of the turbo with vac line.... is that the VNT actuator?
-
Waste gate actuator which i presume is operated by the n45 electronic valve
-
Waste gate actuator which i presume is operated by the n45 electronic valve
:y
-
Waste gate actuator which i presume is operated by the n45 electronic valve
No wastegate on AJM motor,variable vane jobby,what you see is the vac actuator :y
Airflow meters not expensive even from VW,circa 65quid ish
-
Ps, guys. not bumping the thread but i been looking in to different types of turbos. these VGT (or VNT) ones seem to be the best available.
Is that still the case? Bearing in mind her dad's car is a W reg with a VNT in?
-
And just to clarify....
the N75 valve uses vacuum to actuate the change in turbine vane angle when required between the lower and higher engine speeds????