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Discussion Starter · #1 ·
4 months ago I bought a 55 plate Laguna 1.9Dci Dynamique, and have now had the following problem 4 times.

Driving in warm weather - sometimes 20 miles, the last time (yesterday) only 2 miles - I stop the engine and return to the car between 10mins and 2hours later.

I put the key in and the stop light under the rev counter and the red round light between the fuel and temp gauges come one.

I press Start, and "Check Oil Pressure" with the oil can comes on too - along with the amber spanner symbol under the speedo. The temp gauge is at cold.

The car turns over constantly but doesn't start.
I press Stop and the "Check Hand Brake" sign comes on?!

The first time it happened, i'd driven 20 miles in very hot weather and had been stuck in traffic. I opened the bonnet and unscrewed the oil cap and left it for 10 mins. Same problem. By the time the breakdown van arrived an hour later, it started fine.

2nd time similar to above, but just waited an hour and all ok.

3rd time, I depressed the clutch and it started 2nd time.

4th time - yesterday, I turned the AC off (which i'd left on from earlier) and is started. I'd only driven 2 miles about 2 hours before. Got home and tried to replicate the problem - left AC on, turned the engine off - left it 20 mins, went back to it - same problem. Turned AC/blower/radio off - still no luck.

It started ok this morning..

I've taken it to a garage to perform diags - and back to the dealer, who had it for a couple of days but couldn't replicate the problem. He took it to a Renault specialist for diags too - both instances showed no recorded faults at all..

Short of having the problem again, hopefully at home - and hopefully calling out a garage before the problem resolves itself - to perform diags whilst it's knackered, I'm at a loss what to do!

Any help at all would be most appreciated..

Thanks in advance.
Nick.
 

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I was going to suggest a knackered safety ajar switch on either the clutch, handbrake, or transmission,
but as you say the engine is trying to turn over, I'd check the battery with a voltmeter or multimeter for a start.

Somewhere between 12.5 and 14.5 volts would be acceptable when the engine has been off for a few hours.
 

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Discussion Starter · #3 ·
Hi Costeau - thanks very much for your reply!
Not having a clue about anything under the bonnet - what are you thinking the problem may be caused by (obviously the battery - but what in particular?)
Cheers.
Nick.
 

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Diamond dismember
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If the voltage is way too low, the engine will obviously not turn over.
If it's only a little too low, it may or may not turn over - it'll be a bit temperamental about it, and I suspect that could be the cause here.

Measure the voltage before you turn on the engine.

Then, take the car for a coupe of hours of motorway cruising, to let the alternator do its job,
and then leave the car for a few hours before checking again if the car turns over properly or not.

If it doesn't, measure the voltage again. If you notice a decrease since before the journey, I'd suspect either the battery or alternator is faulty.
 

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Discussion Starter · #5 ·
Thanks very much Costeau.
I will dig my multimeter out and give it a go.

To be honest, i'm peed off with this happening 4 times in 4 months. It's an ex-company car and I can't believe it didn't happen to the previous owner - but surely it would have been sorted during the frequent services it's had.

Will let you know what transpires..

Thanks again.
Nick.
 

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Discussion Starter · #7 ·
Hi if you're there Costeau.
An update.. Took the car out at lunchtime on Monday (about 2 miles) - went to start it after 10 mins off and only started 2nd time. Got back to work and it did the same, so took it to a local garage.

Currently, they are able to replicate the issue - but when the problem occurs, they can't communicate with the ECU. There are a couple of error codes showing when the issue isn't occuring which they will look at today to see if relevant.

I've suggested your thoughts to them, which they had concurred with.

Will see what they say later. Fingers crossed it's nothing major/expensive!

Cheers.
Nick.
 

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Currently, they are able to replicate the issue - but when the problem occurs, they can't communicate with the ECU. There are a couple of error codes showing when the issue isn't occuring which they will look at today to see if relevant.
Um… If they can communicate with the ECU before the problem makes itself known, intermittent connection issues spring to mind, and there are a few possibilities I'm seeing:

1) Temperamental/w*****ed ECU, i.e. the connection issue is internal. Normally, this'd require replacing the thing, which is an expensive affair.
I'm predicting a three-figure sum + labour (fitting and coding - garage can give more exact figures)

2) Corrosion in the ECU's connectors
This one's pretty easy: Remove the battery (disconnect the negative terminal first), the battery tray, and the ECU's underneath it.

When undoing the plug, make sure you flip back the securing latches fully and completely, and that the plug comes undone evenly.
If there's any mechanical resistance on one side, avoid bending the plug towards that side, as internal plastic bits of the plug on that side might crack.
(Happened to mine - Still have to get a new ECU housing from eBay and move mine over to it.)

Once unplugged, inspect for corrosion. If there's any sign of it, douse both the sockets in the ECU itself and the plugs with contact cleaner (NOT WD40, please!),
and give it a few minutes to dry, before piecing it back together again.

3) Any of the wiring looms that the ECU's hooked up to might be knackered, and have sporadic contact issues because of this.
The garage should be able to measure their way through this.
 

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Discussion Starter · #9 ·
Thanks very much for your reply. I'm hoping the garage are as helpful and knowledgable!
It's great to have a heads up on this, so I can understand / communicate better when speaking to the garage.
Will keep you posted on what they find.
Thanks again Costeau!
 

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No worries. Let's hear how they get on. The ECU connectors on the Laguna are prone to corrosion, from what I could ascertain by reading a few other threads kicking about here on the forums.
The reason I'm saying "connectors" in plural, is that while it looks like one plug, it's actually three connectors that are molded into one unit, with three separate O-rings on the plugs and three separate ports on the ECU itself (or at least it's like that with the one for the F4P engine).
 

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Hi All,

Pretty sure it is the battery is either flat or getting there. Have exactly the same problem with my laguna. put some jump leads on from my Ford Ka and it started and worked fine after that. Not sure why the battery went flat in the first place but I wonder if it could be that I let the car activate the handbrake when I stop rather than pulling the thing myself :confused:
 

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Discussion Starter · #12 ·
Well - they've taken the Laguna to a Renualt Garage to have the software versions checked (took a while for them to book it in and pick it up - but I had a courtesy car, so who cares)..

Seems that a software update has sorted the problem! The battery and alternator checked out fine. They were suspecting the MCU? (Not sure if this is correct acronym or description) but it's way cheaper to replace than the ECU) - but considering the problem was happening with increasing regularity to the point they could replicate it all the time, and they've tested it fully today without any issues - it looks promising..

The software was out of date, but why should that matter?!

Picking it up tomorrow, total cost £168 - which ain't bad considering they've done a lot of probing, have driven it 20 miles to the Renault Garage and back, Renault have done the update, and i've had their courtesy car for 2 weeks!

Fingers and toes crossed - though odd if this is the fix that it's been an increasing issue rather than an instant one...


Will let you know how I get on over the next few days...

Nick.
 

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Discussion Starter · #13 ·
Re: Laguna II. Won't start - Check Oil Pressure and Check Handbrake on *FIXED*

Well - i've had the car back for just over a week now and have not been able to replicate the original problem.

I've no idea's why but the software update seems to have fixed the issue..

Thanks all for your comments and advice..

Nick.
 

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Thanks very much Costeau.
I will dig my multimeter out and give it a go.

To be honest, i'm peed off with this happening 4 times in 4 months. It's an ex-company car and I can't believe it didn't happen to the previous owner - but surely it would have been sorted during the frequent services it's had.

Will let you know what transpires..

Thanks again.
Nick.
My ren nooo is playing up again too,Can't believe I finally bought one of the sh*tboxes.never again!horrible little pieces of dodgy engineering.SAAB bankrupt,these idiots still going...hows that happen?
 

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Re: Laguna II. Won't start - Check Oil Pressure and Check Handbrake on *FIXED*

Well - i've had the car back for just over a week now and have not been able to replicate the original problem.

I've no idea's why but the software update seems to have fixed the issue..

Thanks all for your comments and advice..

Nick.
Did the car stay running fine after the software update? this is exactly what mine is doing.
 

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Had the car in at the Renault dealers today-came up no communication with injection computer when it was faulting,had a reprogram and a plug under the battery which they say can be a cause cleaned.plus they washed it and gave it a healthcheck for £65,all seems ok upto now but time will tell wether it was a cheap fix or a bloody expensive bucket of soapy water and hose pipe...plus side is only thing healthcheck showed up was discoloured brake fluid.not sure service manager was impressed when he said it was one of the cleanest they'd seen for its age and I replied that it was cos they'd just washed it...hey ho,just praying it's sorted out now.funny thing is-even now with all the supposed advancements the 2 most reliable cars i've ever owned were a 1986 sierra 2.8 4x4 and a 1995 rover 214 sei...Progres,don't think so.
 

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Two weeks in and still no sign of the fault reoccuring(touching wood and holding my lucky rabbits foot) I'm not posting this for any other reason than to let anyone else who has the issue know that it seems to be the fix,Maybe Trenton in Hull are just a good honest Nissan dealer/Ex Renault but still approved as same group dealership and supplied my car new.More than happy with their service,Looking like £65 well spent upto now.and to top it all it runs smoother,with more torque and the fuel economy is now showing at a constant 48.8mpg which is up from the 43 odd it was doing in the first 18 months since i've owned the car,so it's looking like it's kinda had the fault since I got it-not sure if the software update or the cleaning up of the plug is the reason but i'm nervously happy all the same...Car flew through it's mot today,no advisories so for the time being i'm happy to own Jean Reno again.
 
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