Renault Laguna 2 - 1.8 16v Throttle Problem*FIXED* - Page 7 - Renault Forums :: Independent Renault forum

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post #31 of 129 (permalink) Old 1st April 2008
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Well the day after I did all the above I had the warning light and limp home mode activate 4 times in quick succession, the day we did the work was really wet as was the following day and I do wonder if we had let damp into the wiring loom, with the better weather the car has only done it once so may be drying out?
Conclusion has to be that the problem does indeed lie with the loom connectors/ ecu as we did nothing else, didn't touch throttle body or disturb any other system parts and I can't believe the 4 times activation was a coincidence.
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post #32 of 129 (permalink) Old 5th June 2008
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OK just an update but hopefully a useful one for others with this problem.
We waited for a nice dry day and repeated the ecu clean leaving the open ends of the connectors in the sun for a few hours, replaced and all was well for 24 hrs then the fault re-occurred.
We have now removed and cleaned the throttle body (it was just a bit black inside, no 'bits' to speak of) and the car if anything is now worse!
Managed to get into our local garage who had the car for 2 days and couldn't get the fault to re-occur but cleared the fault and all was well for 3 days before backcame the fault (they said that would probably happen) took the car back to them today with the fault warning showing and the car in 'limp home' and they put it straight onto their diagnostic machine, their experienced mechanic is 98% sure that this is an ECU fault as he was able to send the correct signal to the throttle and get the throttle to respond correctly, as we were watching ther display he was telling us that the 2 signals did not correspond (was above my head by now!) having switched off and cleared the fault we could see the correct 'box' shaped signal.
Options at the moment are
repalcement ECU from Renault 700 odd quid
replacement reprogrammed ECU about 200
send off have tested and repaired my ECU about 180 ish
still not good but not the 700 that Renault want!
Watch this space.
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post #33 of 129 (permalink) Old 24th June 2008
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Samsam, further to your last post about 6 months ago, anything further to report ? Did it work for you ?

My Y Reg Lag has just started to play silly beggars, did the reboot procedure but that failed to clear it. Disconnected battery for 2 minutes, reconnected then rebooted. That cleared it for about 10 days but happened again to me this evening. Repeated the procedure to get into "normal mode".

Would like to have a permanent fix for this PITA.

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post #34 of 129 (permalink) Old 25th June 2008
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Another piece of experience to throw in the pot.
2 years ago, I started having 2000rpm sticking problems with the associated electical fault light occuring. It was easily fixed by disconnecting the battery for a second. The problem got more and more frequent until recently when it became virtually permanent. The local garage cleaned the throttle body to no benefit. The Renault garage, after about an hour and a half work, advised it was almost certainly due to a throttle body fault. Other possibilities were fuel injection computer (very expensive). The new throttle body seems to have fixed the problem (2 weeks and no repeat) and cost about 250 for parts and labour for diagnosing and fixing the problem. Surprisingly reasonable for Renault!
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post #35 of 129 (permalink) Old 1st September 2008
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Hi guys, I am experiencing the same symptoms as you with the car going into limp mode etc, was just wondering how everyone has got on, is there a definitive answer? I've only had the car a couple of weeks and when I take it back to the dealer who sold it to me I would like to be able to tell them exactly what the problem is. Looking at the service history it's already had a new throttle body etc. Really would like to get this fixed as I really like the car and don't want to get rid of it if at all possible.
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16v , laguna , problemfixed , renault , throttle

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