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post #1 of 4 (permalink) Old 8th November 2005 Thread Starter
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Location/Removal of ECU (Scenic Diesel)

Well after having a dead Scenic 1.9 TDi sitting on my drive for two weeks, I finally managed to find a mobile auto-electrician to come and look at it.

After spending about 40 minutes on it, he concluded that he couldn't fix it - the problem was probably a faulty ECU - it would have to go back to Renault and would be expensive (like I don't know that!)...

Anyway, after hunting round the net for a while, I've found a few companies that will test your ECU for you (for about 35), and fix it if it is faulty. This seemed like a good idea, which will probably be far cheaper and less hassle than getting the car towed to the local dealership...

So... Does anyone have any experience of these sorts of companies? Are they any good?

And secondly (and the point of this post), does anyone know the location of the ECU on a 1999 Scenic Diesel? Is there a particular proceedure for it's removal/replacement?

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post #2 of 4 (permalink) Old 9th November 2005
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It's in a plastic box IIRC to the left of the car - if you open the bonnet and look in, standing in front of the car, there is a large black sandwich-box sized plastic enclosure with a clip-on lid. Never having opened mine, I'm not sure if there is just one ECU in there, or if the ABS computer is inside too. Anyone else able to confirm this?

Edit - just thinking about the above post - why isn't the car starting? Does the starter work, but the engine won't fire? Is the battery voltage too low? Has the immobiliser not been de-activated properly? Have you tried using both sets of keys for the car and seeing if it will start with one but not the other?
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post #3 of 4 (permalink) Old 9th November 2005 Thread Starter
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why isn't the car starting?
Basically everything was working fine until one morning it wouldn't start.
The engine was turning over fine (so both battery & starter are ok), but no firing.
I noticed that when I turn on the ignition the glow plug light and electrical warning light do not come on at all (both should light and then go out after a few seconds).

I had an auto-electrician look at it. He concluded that the glow plug relay is working ok, however it is not getting any power, therefore he thinks that the ECU is faulty, but couldn't test it so couldn't give a definitive answer.

However I have found an ECU specialist very close to me who will test the ECU for 35 and then fix it if it needs it... Seems like a good option instead of going to the dealer!
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post #4 of 4 (permalink) Old 9th November 2005
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If the MIL light and glow-plug lights aren't coming on; surely the first check is the condition of the engine management fuse and the engine control relay in the underbonnet box. The second check should be for broken ECU earth[s]. Blaming the ECU should have come a long way down the list.

How experienced was this auto-electrician? Anyone who works in this area should have been equipped with the means and contacts to fix the job; even to the point of being able to recode a new ECU - in the unlikely event of one being needed. Did he even have a scanner?
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diesel , ecu , location or removal , scenic

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