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Discussion Starter #1
:(

Hi,

I had a "check emmissions" error message, and my local spit and sawdust garage put their handheld computer on it which said that there was a problem with the EGR valve. As I have loss of power and the engine won't rev above about 2800rpm, I agreed for them to replace the EGR (they took it off but found it wasn't very dirty so assumed it was faulty). It's a £300 part.

Now it's done everything is the same - same error message, same lack of power. Is there a fuse which governs the operation of this thing which could have gone? How do I get access to the fuses?

Thanks for any advice.

Robin
 

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Discussion Starter #3
The problem with dumb computers is that they can't tell the difference between a faulty component and a poor connection. How far has the car been driven since the new EGR valve was fitted?

There is a possibilty there is a poor electrical connection to the valve. The link below may be of some assistance in diagnosing the problem.:)
That might be it because they said it wasn't really very clogged up at all. It's a brand new bit (£300!) and so now it's back with the garage. Looks like it wasn't the valve in the first place but an elecrical issue! Any idea where the fuse for it is?
 

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It doesn't have its own fuse and a simple electrical test would prove if it wasn't getting voltage anyhow.

Also check with the garage if their diagnostic kit is fully compatible with Renaults. Renault use a dufferent protocol in their ECU software so not all code readers are compatible.:)
 

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Doubtful that the egr or it's wiring is the problem! If the new egr was fitted and not operating it would be closed and the engine would operate as though the valve was blanked off. Check for operation of the valve. With acknowledgement to Mickeybo:- "Check egr valve multiplug back probe no 6 terminal which is the signal return wire to control unit (ecu) at ign on should show a reading of approx 1 volt car idling reading approx 1.5v ish as the revs rise so does volts to operate position sensor in egr valve"
Perhaps another cause should be pursued! Are there any other symptoms eg smoke, lack of boost etc.
 

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Discussion Starter #6
how can I get the ECU checked? It seems that the diesel specialist that they got in thinks that MIGHT be the problem. having said that I think the physical wiring is more of a candidate having read this thread.

I'll be speaking to the garage owner later and may come back!! Cheers for the advice so far.
 

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Doubtful that the egr or it's wiring is the problem! If the new egr was fitted and not operating it would be closed and the engine would operate as though the valve was blanked off. Check for operation of the valve. With acknowledgement to Mickeybo:- "Check egr valve multiplug back probe no 6 terminal which is the signal return wire to control unit (ecu) at ign on should show a reading of approx 1 volt car idling reading approx 1.5v ish as the revs rise so does volts to operate position sensor in egr valve"
Perhaps another cause should be pursued! Are there any other symptoms eg smoke, lack of boost etc.
No smoke, just underpowered (slows to 65mph on hills) and does not rev above about 2800rpm.

I am seeing intermittent electrical issues - tyre pressure sensors are suddenly intermittent, "Check emissions" and "Check Injection" warnings (replaced glow plugs just three months ago which got rid of the check injection message for a while).

Someone's suggesting possible ECU problems. Any justification to this? Everything else seems OK and I'm getting over 40mpg which is about right.

Thanks for advice so far - very useful.
Robin
 

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Update. A "diesel diagnostician" has had a look and said that the voltage on the "5 volt supply wire" is only 0.5V. Fuses are all OK so the "ECU needs checking".

Where on earth could I get that done? I want to make sure it's somewhere reputable because I understand that a new ECU is no small matter!

I live in North Kent (medway/maidstone area).
 

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I have exactly the same problem, continual fault codes indication an EGR fault, however it has been changed. I've also had a new turbo waste gate, new turbo, new air mass and have had a wiring check! I'm at the stage now where I wish one of the local yobs would torch it!! Somebody suggested it might just be the ECU software requiring an upgrade! Any help would b appreciated.
 

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hi my megane 1.9dci 2007 has loss of power turbo only works on cold mornings rarely for about 5 mins ive got check injection,check emissions replaced egr as told by a couple of mechanics got a little more power but no way as much as it should any advice would be great
 
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