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Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #

Posted by Shaun Dale on July 29, 2010, 10:58 pm

Year of Manufacture *: 2004
Engine Size and Code *: 1.9 DCi 100
( Optional ) Scanner Used: Multiscan/ ACR4/ Axone 2000
( Optional) Fault Codes: 1814

Hi All,
First saw this vehicle some time ago, sorry cannot remember the full fault code set as I'm at home now But P1814 EGR circuit was the one that seemed relevant. The garage I diagnosed it for fitted a new EGR valve and all was well for a couple of weeks. The problems came back again and the owner decided to take the vehicle to the main dealer who relieved him of £1200 and fitted a new engine loom.
Strangely enough the problems are back again. Symptoms are low power below about 2000rpm but above that it perks up ok although perhaps a little down on power. One DTC returns; P1814, descriptions vary according to machine but along the lines of "EGR circuit". The EGR solenoid is being driven and the feedback voltage varies accordingly.
I am having trouble finding an "in-depth" description of what this code means and the conditions for setting it. I did find some information that suggested this is equivalent to a P0400 "insufficient flow detected",but I am not sure how reliable that is.
My concern is "EGR circuit" could mean "electrical circuit" or it could mean "EGR gas flow circuit". The garage did check to see that the EGR pipe is clear as far as is possible and it looked ok. Does the EGR valve need an adaption performed after its replacement? Of course we could just get the customer to stick it back at the dealers door but I would like to get to the bottom of this myself if I can.
Shaun

Re: Renault trafic 1814 fault code

Posted by Fiachra Purcell <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3006' width='330' height='300' border=0 style='border:none;'> on July 30, 2010, 8:25 am, in reply to "Renault trafic 1814 fault code"
Fiachra Purcell

I have never had to adapt one of these. I would check the egr flow as these are renowned for blocking up. I regularly clean these egr valves and the manifold where it sits in during servicing and it generally brings the power back after a couple of miles driving them hard. Good luck

Re: Renault trafic 1814 fault code

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on July 30, 2010, 8:36 am, in reply to "Re: Renault trafic 1814 fault code"

If you want a better code description then get the vehicle read by someone with Clip. HTH

Regards Mark

PS. you could then use Dialogys to work through the fault

Modern cars, Its all wizardry and witchcraft

Re: Renault trafic 1814 fault code

Posted by Shaun Dale <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2719' width='330' height='300' border=0 style='border:none;'> on July 30, 2010, 10:32 am, in reply to "Re: Renault trafic 1814 fault code"
Shaun Dale

Fiachra, thank you I will pass that on to the garage.
Mark, as seems to be the case so frequently, aftermarket tools just aren't up to the job. Unfortunately after the last 18 months of "difficult trading conditions" I have no funds to buy genuine equipment.
Nevertheless there must be a decent description of that fault code available.
Shaun

Re: Renault trafic 1814 fault code

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on July 30, 2010, 10:09 pm, in reply to "Re: Renault trafic 1814 fault code"
Mark Carter

A little bit of digging points the fault code to P0400, which is a low flow fault code, now if that is right your next step is to work out how the ECU arrives at that decision. HTH

Regards Mark

Modern cars, Its all wizardry and witchcraft

Re: Renault trafic 1814 fault code

Posted by Bryan Smith <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5330' width='330' height='300' border=0 style='border:none;'> on August 2, 2010, 8:19 pm, in reply to "Re: Renault trafic 1814 fault code"
Bryan Smith

Hi Mark,
Am I correct in thinking that you are steering Shaun to check the MAF?
Regards, Bryan.

Re: Renault trafic 1814 fault code

Posted by Richard Endean <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2939' width='330' height='300' border=0 style='border:none;'> on July 19, 2012, 6:23 pm, in reply to "Re: Renault trafic 1814 fault code"
Richard Endean

Thought I'd resurrect this old thread rather than start a new one. We have a 51 plate Scenic (f9q732)and I'm getting P1814 - egr valve on my DEC and p0400 egr low input on the KTS.

New valve was fitted recently and cleaned the manifold where the valve sits. KTS gives me the option to reset egr parameters but the sequence always fails. In live data it shows egr position as 0V which is not surprising as the valve is only 2 wire and one would assume the feedback is via the AFM.

Have I got a problem with configuration? Is the ecu looking for a feedback voltage which doesn't exist? Can someone with CLIP tell me whether there is an option to enable / disable electronic feedback?

For what it's worth, the egr valve does work. The AFM signal drops by about 20% when the egr is operational. I did notice that the egr signal seems to be either 5% or 40% and pretty much nothing else. Is this usual?

TIA
Dick

Re: Renault trafic 1814 fault code

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on July 19, 2012, 10:49 pm, in reply to "Re: Renault trafic 1814 fault code"
Mark Carter

>>> The AFM signal drops by about 20% when the egr is operational <<<

?????????????????

Mark

Modern cars, Its all wizardry and witchcraft

Re: Renault trafic 1814 fault code

Posted by Richard Endean <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2939' width='330' height='300' border=0 style='border:none;'> on July 20, 2012, 8:50 am, in reply to "Re: Renault trafic 1814 fault code"
Richard Endean

If it's running partially on its own exhaust gas it'll draw less air through the air intake system. That's why a lot of vehicles will give a code for AFM excessive flow when, in fact, it is the egr system suffering insufficient flow.

The ecu will normally control the egr valve duty cycle to get the required drop in air flow.

Re: Renault trafic 1814 fault code

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on July 20, 2012, 6:05 pm, in reply to "Re: Renault trafic 1814 fault code"
Mark Carter

>>> That's why a lot of vehicles will give a code for AFM excessive flow <<<

What P code number would that be?

Modern cars, Its all wizardry and witchcraft

Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #

Posted by Shane Gray <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3442' width='330' height='300' border=0 style='border:none;'> on July 20, 2012, 9:00 pm, in reply to "Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #"
Shane Gray

Hi Shaun,
Just to try and save you a little time I stock an maf sensor for these engines as they are so common to go. They bring up some strange codes and egr faults and it's nearly always maf if power is low.
I have had an autoboss scanner(till it was stollen) and a Mach vci and they both struggle on these!
Shane

Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #

Posted by Richard Endean <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2939' width='330' height='300' border=0 style='border:none;'> on July 21, 2012, 10:01 am, in reply to "Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #"
Richard Endean

Shane,
My air flow readings seem good and there's no noticeable lack of performance. However, I might see if I can borrow an AFM to try.

Having done some digging, it appears that this ecu doesn't have the hardware to utilise an egr valve with electronic feedback so that should rule out a configuration fault.

It's just one of those jobs where the customer has paid a bill so you're fixing for free which takes the edge off our enthusiasm!

Car's back in next week so will you all posted.

And Mark, being a smartass is of no use at all

Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on July 21, 2012, 2:22 pm, in reply to "Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #"
Mark Carter

>>> And Mark, being a smartass is of no use at all <<<

Please explain ?

Modern cars, Its all wizardry and witchcraft

Re: Renault trafic 1814 fault code

Posted by richard endean <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2939' width='330' height='300' border=0 style='border:none;'> on July 21, 2012, 4:20 pm, in reply to "Re: Renault trafic 1814 fault code"
Richard Endean

A post which reads '????????????????'

And another which says 'and that code would be?'

If you know the answer to my queries I'm sure a lot of people would appreciate you sharing your knowledge and experience.

If you know the answers but insist on keeping them to yourself, apart from a couple of cryptic comments, that's being a smartass.

If you don't know then perhaps you shouldn't bother answering at all.

Re: Renault trafic 1814 fault code

Posted by Kevin Apps <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2589' width='330' height='300' border=0 style='border:none;'> on July 21, 2012, 4:59 pm, in reply to "Re: Renault trafic 1814 fault code"
Kevin Apps

Richard.

Mark is a smart fellow (smart enough to be a bosch instructor), no ass involved.

His cryptic comments are designed for you and others to think about the problem not give you a silver bullet that will do you no good in a future (similar) problem.

But i suppose my post will make me another smart-ass.

Kev.

Re: Renault trafic 1814 fault code

Posted by Lee Mackintosh on July 21, 2012, 5:22 pm, in reply to "Re: Renault trafic 1814 fault code"
Message modified by board administrator July 23, 2012, 3:07 pm

Can't you activate the egr valve with the engine running and watch the live data for AFM whilst the egr is under your command.

Not saying this will be the actual answer to your fault but if the AFM reading doesn't drop with egr activated then you have a problem/direction in which to fault find.

You already know that a 20% reduction in AFM reading is expected so compare.

Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #

Posted by Pete Mutlow <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1569' width='330' height='300' border=0 style='border:none;'> on July 21, 2012, 7:43 pm, in reply to "Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #"
Peter Mutlow

Hi Richard,

I agree with Kevin. Mark is merely asking you questions to try and get your thought processes together to get to the right answer. I know we all want instant answers but the best way to learn is to be asked thought provoking questions. As has been said, Mark is an instructor, certainly not a smartass but a man on top of his game.

Best regards

Pete Mutlow

Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #

Posted by Steve Harrison <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1363' width='330' height='300' border=0 style='border:none;'> on July 21, 2012, 8:32 pm, in reply to "Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #"
Stephen Harrison

"Mark is a smart fellow (smart enough to be a bosch instructor), no ass involved."

"Mark is an instructor, certainly not a smartass but a man on top of his game."

He is also a extremely nice person

Steve

Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on July 21, 2012, 9:18 pm, in reply to "Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #"

Hi Richard,

>>> If you don't know then perhaps you shouldn't bother answering at all. <<<

Sorry if I have upset you, but if you bothered to READ your own posts the answer to your fault code is there for all to see.

The line of question marks was there for the reason that others have said, and not as a piss take.

>>> That's why a lot of vehicles will give a code for AFM excessive flow <<<

The reason for that reply is the fact that I have not seen such a "P" code logged for a Renault and like others I'm always ready to learn.

Good Night.

Mark

Modern cars, Its all wizardry and witchcraft

Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #

Posted by Steve Kefford <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1094' width='330' height='300' border=0 style='border:none;'> on July 21, 2012, 10:21 pm, in reply to "Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #"
Stephen Kefford

Mark

Have seen this code description a number of times on BMW diesels but not with a P code only a BMW specific one.

Regards
Steve

Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on July 22, 2012, 7:32 am, in reply to "Re: Renault Trafic 1.9 DCi 2004 - Fault code P1814 EGR circuit #"

Hi Steve,

Yes I agree, as a manufacturers code on some Bmw's. I belive they look at the system from a different direction.

I should have worded my reply differently and added the word "P" code and Renault.

I have never seen a P code for monitoring of the AMM as described, and the way it was worded as "That's why a lot of vehicles" I thought that I was missing something. Which is always possible as none of us know everything.

Mark

Ps I will change the earlier post as so.

Modern cars, Its all wizardry and witchcraft

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