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[Webby the Bear]

Hi guys,

Just put the code reader on the wife's dad's Passat (engine code AJM). Got the following:



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?

[4x4]

Try cleaning maf 1st and see if that helps 
And clear codes before refitting it.

[Webby the Bear]

Thanks Martin, will do 

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...

[4x4]

Are them vacum hoses braided rubber?

[Webby the Bear]

I think they're braided. They're not the normal rubber oneslike on the omega

[4x4]

They may look ok,but for the age of the car i would replace them with silicone 

[Webby the Bear]

ok thanks mate. for the sake of a few pence I may just do that 

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

[4x4]

http://www.vwt4forum.co.uk/showthread.php?t=87750

[Webby the Bear]

Thanks Martin.

Here's the bad boy in question...



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.

[4x4]

Change that pipe then,and then see if it does the same after.

[Webby the Bear]

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


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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. 

[Webby the Bear]

In short I think I should be checking that turbo also...

[05omegav6]

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.

[henryd]

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

[Webby the Bear]

Thanks guys!

I'm sure I have some thin diameter vacuum line knocking around.

I'll also disconnect MAF and see what I get