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P0403-00 (2F) Exhaust gas recirculation control circuit
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Hi Lucky5iveIron

Hopefully this may also be of some use to u , have the same year as yours , faults were running rough , then at approx 2,000 revs would suddenly go into limp mode, mainly from hard acceleration or up a hill , these were some of the fault codes I had

Engine TDV6

P0402-00 (6C) Exhaust gas recirculation flow excessive detected
- Confirmed
- Test Failed Since Last Clear
- Test Not Completed This Monitoring Cycle

P0234-00 (68) Turbo/supercharger overboost condition
- Confirmed
- Test Failed Since Last Clear
- Test Not Completed This Monitoring Cycle
P132B-00 (28) Turbo/supercharger boost control A performance
- Confirmed
- Test Failed Since Last Clear


This was roughly what I done, blanked off both the EGR valves, left pipes in situ , fitted the same blanks as @Pete k linked to between the Egr pipes and engine block, reason being for the mot

removed throttle body and removed butterfly valve, reinserted butterfly pin, cleaned inside throttle body , cleaned MAP sensor with EGR cleaner

Then bought a set of silicone intercooler hoses and T clamps/ jubilee clips

Found the jubilee hose clamp broke where the hose attaches to the turbo

Of course that may not sort all ur errors out but just wished to share what codes I had and what I done to resolve my issues

Hope that helps and u didn’t mind me posting this Thumbs Up
  

Last edited by gstuart on 14th Jan 2021 8:49 am. Edited 1 time in total 
Post #220197014th Jan 2021 8:37 am
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Prette
 


Member Since: 16 Mar 2020
Location: Previously Stoke-ST4 (pre-pandemic), Mostly The Hague (NL) partially Lyngby (DK) certainly somewhere
Posts: 160

2007 Discovery 3 TDV6 HSE Lux Auto Causeway GreyDiscovery 3

Perhaps if you egr is jammed but the car does not know it, it might overfuel or under fuel because it thinks different amount of fresh air is getting in. Just a guess.

The proportion of fuel/air (as well as egr values) also changes if engine is cold or hot.

Have a look in the fuel pump and fuel filter, i had an error in the past with same start (foot down and fault light) it said something about fuel rail but i cannot remember what.

First things first. Emergency blanking and see if changes. It should take 15 min to do.
  
Post #220197114th Jan 2021 8:42 am
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Hi prette

Interesting u also saying about the egr , alas mine came up with fault code , P0402-00 and see Lucky5iveIron has, ref P0403-00

For mine it says “ Exhaust gas recirculation flow excessive detected “ , assume then it’s the same error but just the other side

Must admit noticed the difference straight away when I blanked mine Thumbs Up

Ps, hope I’m not stepping on anyone toes
   
Post #220197714th Jan 2021 9:03 am
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Lucky5iveIron
 


Member Since: 25 Dec 2015
Location: Cambridge
Posts: 97

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Grateful for all the suggestions I can get as can’t work this one out on my own!
Ill start with egr blanking at some point over weekend. In meantime I’ll pull all my fault codes (pretty sure it’s only a short list at the mo! 8) ) and double check I’m not missing something else.
  
Post #220198014th Jan 2021 9:13 am
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Hi

Ur so welcome and always a team effort, god knows I’ve needed help over the last 4 x years of owning mine , found the forum to be such an awesome community and made some good friends along the way

Here’s a EGR blank guide just in case u haven’t got one

https://media.disco3.co.uk/gallery/albums/userpics/12136/EGR.pdf

Also found using some plumbers clear silicone grease helped a lot on the large throttle body O rings

Plse let us know how things go , what code reader are u using please , thks

Ps, ref the gap iid , indeed know there expensive but my god they pay for themselves very quickly
   
Post #220198314th Jan 2021 9:29 am
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Prette
 


Member Since: 16 Mar 2020
Location: Previously Stoke-ST4 (pre-pandemic), Mostly The Hague (NL) partially Lyngby (DK) certainly somewhere
Posts: 160

2007 Discovery 3 TDV6 HSE Lux Auto Causeway GreyDiscovery 3

gstuart wrote:

Ps, hope I’m not stepping on anyone toes


Absolutely not. Thanks for asking. And i would like to ask the same thing as I don't have as much experience as many here but i try to follow and engineering structured approach. (I will dissert that later on another long post)

Regarding your error codes (both of you) maybe you both have egr flow sensor (or the like).

Which in my case is purely indicated by the position of the valves. But in fact, when my egr was open and put foot down right after engine start i got a similar error (circuit high) right away, but it cleared and never came back.

Now, im driving with my right egr blanked (although the car ecu hinks it is open). I have the fault P0489 - recirculation circuit low. But the car runs ok and i see both egrs are 'disabled' by the ecu (values do not change. When i connect an external working egr, the system came back to live, no error was trown and blanking worked a treat. So... I suppose there is no 'one size fits all' for disco.
  
Post #220201114th Jan 2021 10:14 am
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Lucky5iveIron
 


Member Since: 25 Dec 2015
Location: Cambridge
Posts: 97

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

EGR’s are now blanked. A dirty job, but an easy one!
Frustratingly though, it has not solved the problem Big Cry
Car still running rough, little power and “engine system fault” with limp mode if I put my foot to the floor Censored
However… I have now got new fault codes logged:

Engine TDV6

P0403-00 (2F) Exhaust gas recirculation control circuit
(Safe to ignore all EGR related faults now they’re blanked?)
P2290-00 (2E) Injector control pressure too low
P029B-00 (2F) Cylinder 1 balance - fuel trim at minimum limit

Worn injectors the problem??
  
Post #220283016th Jan 2021 5:14 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10337

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Well low fuel pressure ??

One of the pumps or the filter ?
  
Post #220283716th Jan 2021 5:33 pm
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Prette
 


Member Since: 16 Mar 2020
Location: Previously Stoke-ST4 (pre-pandemic), Mostly The Hague (NL) partially Lyngby (DK) certainly somewhere
Posts: 160

2007 Discovery 3 TDV6 HSE Lux Auto Causeway GreyDiscovery 3

Prette wrote:
Have a look in the fuel pump and fuel filter, i had an error in the past with same start (foot down and fault light) it said something about fuel rail but i cannot remember what.


I imagined it could be something like fuel related. You can grasp the 'health' of your injectors by checking the Cylinder balance live data in idle. Post the results here.

The way I solved the problem in mine was using some of those fuel additives and never, never put the foot down at low rev. Always gentle foot. Try to drive in sport mode for a while and only put the foot down above 2000 rpm. (Somehow it solved my problem at the time)

Perhaps other will have better ideas (not related to strip down or replace anything - I always try a more 'soft'/'non-dismantling' approach first... then get to the greasy job. Wink
  
Post #220283816th Jan 2021 5:36 pm
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Lucky5iveIron
 


Member Since: 25 Dec 2015
Location: Cambridge
Posts: 97

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Easy bits first I guess… I’ll replace the fuel filter!
I’ll also grab the readings for my injectors and post them for interpretation!
Thanks guys! Thumbs Up
  
Post #220285316th Jan 2021 6:07 pm
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Lucky5iveIron
 


Member Since: 25 Dec 2015
Location: Cambridge
Posts: 97

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Changed fuel filter and air filter last night… what a difference!! I think that might have fixed it. Drove 30 miles to work this morning and could not replicate the fault. It pulls well and appears to have full power back. Thank you all so much for your advice and moral support Bow down I love this community for that exact reason. Whilst I’m in the mood for tinkering, I think I’ll do an oil change too Thumbs Up
Incidentally, these are the readings I pulled from my injectors:

  
Post #220361719th Jan 2021 11:46 am
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G3Z
 


Member Since: 16 Dec 2018
Location: South Wales
Posts: 536

Wales 2007 Discovery 3 TDV6 GS Manual Zambezi SilverDiscovery 3

Glad it’s back to running properly.

Now it’s sorted - I’d be inclined to run some injector cleaner in the fuel and see if that helps the injector readings.
 Defender 110 2.4 TDCi Utility Station Wagon.

2007 Disco 3 GS TDV6 Manual
200,000+ mile club 😎 
 
Post #220364019th Jan 2021 1:29 pm
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Prette
 


Member Since: 16 Mar 2020
Location: Previously Stoke-ST4 (pre-pandemic), Mostly The Hague (NL) partially Lyngby (DK) certainly somewhere
Posts: 160

2007 Discovery 3 TDV6 HSE Lux Auto Causeway GreyDiscovery 3

Lucky5iveIron wrote:

Incidentally, these are the readings I pulled from my injectors:


I am also glad you sorted that. Thumbs Up

Your injector 1 looks a bit low (but if the car is running fine..... I would not touch it Whistle ) , as suggested above, try to use some fuel additive to clean injector. It might make even better. Then take the injector date again to compare.
  
Post #220364119th Jan 2021 1:40 pm
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