Renault Laguna 2 - 1.9dCi No Turbo Boost/Limp Mode*FIXED* - Page 9 - Renault Forums :: Independent Renault forum

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post #41 of 44 (permalink) Old 16th March 2014
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Re: Renault Laguna 2 - 1.9dCi No Turbo Boost/Limp Mode*FIXED*

Hi, I just bought the same model car you've described this problem for and I'm having exactly the same issues. Can you tell me what the problem was in the end and what you did to fix it, and how much the repair cost. Thanks
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post #42 of 44 (permalink) Old 3rd June 2014
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Re: Renault Laguna 2 - 1.9dCi No Turbo Boost/Limp Mode*FIXED*

The first thing I would be inclined to do is remove the ECU wiring connectors from the ECU and clean all of the pins with a spray electrical contact cleaner. Though this sounds daunting it it actually quite an easy process.

1. Remove the battery and the box it sits in. You will need to remove the air intake to the air box and the connection to the engine bay fuse box.

2 Remove the three large bolts from under the battery box and fold back the metal plate (towards the front of the car).

3. Disconnect each of the connectors and unscrew the ECU .

4. Spray the inside of each of the connectors on the end of the wiring looms with an electrical contact cleaner and rub gently with an old toothbrush.

5. Inspect the ECU connectors, looking for any bent pins touching each other (This happened to mine) and also looking for any signs of a clear jelly like substance. I think this is a primary cause of many problems. I believe when the car is being made the factory put a contact gel into each of the connectors. As this ages it can become non conductive and insulates the pins making the contact intermittent. Be sure to clean this off with contact cleaner and toothbrush.

6. Allow all connectors to dry fully before re-assembling and firing her up.

If this info is any good to anyone please let me know if it works ok and I may make a "How to".
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post #43 of 44 (permalink) Old 13th December 2014
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Re: Renault Laguna 2 - 1.9dCi No Turbo Boost/Limp Mode*FIXED*

I think i have sorted my "limp mode" problem for now. I am sorry if this seems long winded but if you have had the problems i and several other owners have i think it will be worth 5 minutes to read.
I took the car to a very friendly local garage where the boss said he would plug her in and find out all the fault codes for me. He said he did not the have facilities to fix all problems that may show up but at least i would have some info. Amongst the extensive list of codes that appeared, i noticed nearly all the descriptions mentioned "incomplete reading due to battery low" or words to this effect. The battery was the original - 8 years old and had given me no problems in 4 years. The battery was checked and replaced, it had given good service but was time to go. I had also read up on DPF and how they are supposed to self clean. I will add a link later but it means the car needs ideal conditions to complete this operation, if it fails it can put the car into limp mode.
Basically the DPF needs heating up to roughly 600'C for 20 plus minimum to burn off the soot that has accumulated in the filter. It waits until the car is warmed up and cruising at a steady speed before adding extra fuel into the system to increase the temperature which it then needs to sustain for the 20 minutes. If the outside air temp is too low, or you change speed allowing the DPF to cool during the process, the system logs it as a failed attempt and you only get so many attempts. I travel 45 miles each way to London every weekend along the A1(M), and struggled to keep a steady 70mph for 5 minutes let alone 20 minutes.
I read that you can force a burn off by getting the car warmed up then sitting at 70mph in a lower gear to keep revs up hence keeping temperature up in the DPF, for 20 minutes or more! 4th gear was suggested but i did mine in 5th (6 speed box), not a very pleasant job as i try to look after my engine and economy. It also meant going out in the early hours onto a quiet A14 to achieve.
It worked !! I have not gone into limp mode since, the engine seems a little perkier and i have just completed a 1000 mile round trip to Germany without a hiccup. We did it cruising at mostly 75mph and 50mpg with 4 adults on board and a very full boot.
I am still getting yellow warnings coming up but not so often, i intend to get them cleared soon so i can get a clean sheet. I believe some of these warnings appear because of a false reading which could be due to a knackered battery, so i would recommend checking it before going any further.
Again, sorry for the epic write up but i thought it worth sharing, good luck.
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post #44 of 44 (permalink) Old 9th June 2015
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Re: 2001 Renault Laguna II diesel "Yellow Glow Plug and Electronic Fault warning ligh

Originally Posted by Grumpy in Somerton View Post
Over the past several years my daughters have bought a 1998 Renault Clio and a 2004 Renault Meganne 1.9 DCI. Both of these vehicles have been faultless in performance; maintenance has been the usual MOT and schedule maintenance. For that reason, I bought a used Renault Laguna 1.9 DCI from a garage in Somerset and during the first three weeks I’ve had the car, it has performed perfectly, however, week four has not gone without notice; yesterday, the yellow “Glow Plug /Electronic Fault” warning light began showing on the dash constantly…the performance curve falls off sharply…and the engine seems to go into protection mode; the turbo shuts down and the car creeps along at 40 MPH. Took the vehicle into the garage yesterday, they put the vehicle on a diagnostic…said they could not find any problem…drove down the road for ten minutes and the light returned. So long as the vehicle is cold the light does not come on… once the engine comes up to running temperature the light reappears and stays on constantly and the engine sounds like a diesel tractor. Really disappointed in Renault right now…this seems to be common matter that should have been a re-call by Renault…but hey, Renault a French company and I am sure there is some sort of Union rule that forbids company employees form doing re-call work. Any advice on how to go forward would really be a great help. Looks like I might also need to educate the local garage on this “Common” problem…Renault, I really am disappointed with your inferior customer service and ridiculous hourly maintenance cost in England…
Ripped off in Somerset
If it's any consolation, Renault France are just as dire!
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19dci , 1dci , boost or limp , laguna , modefixed , renault , turbo

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