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[albitz]

Just been and read codes on JDX,s 2002 2.2 Diesel. Car drives ok through the gears until it comes to a halt.Then when the engine is at idle the engine light comes on and it goes into limp mode.Accellerate up through the gears and it seems to clear itself and run ok again.
Cleared codes before driving.Read codes after driving.It came up with P0400 -(5) critical system malfunction 2.
No idea what this means. Any diesel experts have any clues on this one please ?

[freecall666]

check the ecu plug, give the trminals a clean, then see if it dose it again.

[JDX]

Albs, thank you for your time & effort this morning, much appreciated.
Thanks too for the reply from freecall666 - I will try your suggestion now.

[albitz]

check the ecu plug, give the trminals a clean, then see if it dose it again.

Interested as to how this relates to that fault code ? 
No problem John.Happy to try to help.Hopefully we can get a definative answer on that code,so we know which direction to proceed.

[Entwood]

check the ecu plug, give the trminals a clean, then see if it dose it again.

Interested as to how this relates to that fault code ? 
No problem John.Happy to try to help.Hopefully we can get a definative answer on that code,so we know which direction to proceed.

It doesn't.... but then again .. look who posted !!

OBDII - P0400 ... info here .. in depth ..

http://www.obd-codes.com/p0400

HTH 

[albitz]

 .................Thanks Nige.That looks a useful site.will put it in my favourites.

Code relates to EGR valve.Possibly just needs cleaning ? Faulty ? Wouldnt be comfartable going much further than I have with my o**** reader. I have no experience of the 2.2 diesel,but if instructions are forthcoming on how to proceed I dont mind trying to help fix it.Failing that, he is planning on attending the Essex meet. Possibility there may be a tech 2 there ?

[albitz]

Anyone have any more specific knowledge of this code ? Dont really want owner replacing EGR valve if not needed.
Tia.

[fergy]

I would suggest a very careful check of vac pipes, My thinking is that at tick over vac is minimum and any leakage will seriously affect any vac that is present. Favourite is the " elbow connector" on the vac pump, rear of the cam cover.

 Also try repeated brake applications to " use up" the available vac - see if  it then puts the EML  light on.

[Entwood]

I would suggest a very careful check of vac pipes, My thinking is that at tick over vac is minimum and any leakage will seriously affect any vac that is present. Favourite is the " elbow connector" on the vac pump, rear of the cam cover.

 Also try repeated brake applications to " use up" the available vac - see if  it then puts the EML  light on.

mmmm  in my experience and understanding .. vac is a MAX at tickover as the throttle plates are closed and the engine is "sucking" against the plates.....  at WOT vac is minimum as there is a free flow of air ....

Now I know i'm old .. but this was always "proveable" on the old Morris Minor ... when flat out ( ok  55 mhp downhill wind assisted) the wipers used to stop..... you had to lift off momentarily to restore vac to get a couple of sweeps ... made you think about power/corners in the rain for whole new reasons - the ability to see out being one of them !!

Yup .. old cars had vac operated wipers ..... 

[fergy]

With respect Mr Entwood, your experience would probably be absolutely correct for a petrol engine, but me thinks that the vacuum in the system on a 2.2Dti originates from a cam shaft driven vacuum pump rather than the manifold- ? Perhaps we need a vacuum pump because there is no inlet manifold vacuum on a diesel engine?

[Entwood]

With respect Mr Entwood, your experience would probably be absolutely correct for a petrol engine, but me thinks that the vacuum in the system on a 2.2Dti originates from a cam shaft driven vacuum pump rather than the manifold- ? Perhaps we need a vacuum pump because there is no inlet manifold vacuum on a diesel engine?

Quite possibly .. ....   just shows how little I know about oil-burners !!! I always assumed that suck, squeeze, bang, blow worked for both ... just that the squeeze also provided the ignition !!! and that the suck varied with a throttle to give more air ... more air = more fuel = more go ... 

[albitz]

Interesting theory.Got to be worth a look.Thanks.

[fergy]

Albs -
This pump connector elbow is a pig to see, but can reasonably easily be felt by "lying across the engine bay", you should be able to feel the identity of the connector and pipe sufficiently to be able to disconnect it and allow proper examination. It is simply a push on/ pull off rubber connector with a bend in it. About £13 from VX  only sold in pairs and delivered from Germany virtually overnight !

 A Vac  test kit is the easiest thing to use when faulting the vac system in my opinion. Consists of a hand pump/ vac gauge, manual valve, adaptor and pipe  E.G.  http://www.jhmbuttco.com/acatalog/Shop_Pressure_Testing_241.html



 Mr Entwood - There is a partial vacuum created by the pistons descending in all cars engines.  In an (old design) petrol engine the vacuum is created by the carburettor having a restriction (the venturi). This vacuum is increased when the throttle flap is closed and the engine is on over run, hence your wipers speed up !

In general diesels can gulp in as much air as they like, not having a venturi or throttle butterfly. ... I think!

[Entwood]

Albs -
This pump connector elbow is a pig to see, but can reasonably easily be felt by "lying across the engine bay", you should be able to feel the identity of the connector and pipe sufficiently to be able to disconnect it and allow proper examination. It is simply a push on/ pull off rubber connector with a bend in it. About £13 from VX  only sold in pairs and delivered from Germany virtually overnight !

 A Vac  test kit is the easiest thing to use when faulting the vac system in my opinion. Consists of a hand pump/ vac gauge, manual valve, adaptor and pipe  E.G.  http://www.jhmbuttco.com/acatalog/Shop_Pressure_Testing_241.html



Mr Entwood - There is a partial vacuum created by the pistons descending in all cars engines.  In an (old design) petrol engine the vacuum is created by the carburettor having a restriction (the venturi). This vacuum is increased when the throttle flap is closed and the engine is on over run, hence your wipers speed up !

In general diesels can gulp in as much air as they like, not having a venturi or throttle butterfly. ... I think!

I believe that is exactly what I said .. except for the venturi bit, which won't work under vaccuum ... a venturi requires flow to work ...