Can someone tell me please:-
How do I reset my ECU on my 1999 VW Passat Turbo?
Thanks.
Mike.
Car details added to subject header - DD
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Mike
Using some very expensive equipment.
Why on earth would you want to? You'd need to do a lot of configuration and adaptions before anything would run properly again. You might even need to have a factory reconfiguration download. ££££s!
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I think he means a soft reset, not a complete reload.
If so, disconnecting the battery for 10mins or so should do it. Just make sure you've the radio code before you do it.
Kevin...
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Thanks Kevin
A soft reset just to allow the ECU to recognise the new mods (replacement air filter). Is there anything else I need to do?
Mike.
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A soft reset is what you need so a battery disconnect will do it.
I have to say that I regard airfilter mods as a complete waste of time and money. On their own they very rarely make any measurable difference and are often worse than the standard units.
Kevin...
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I have to say that I regard airfilter mods as a complete waste of time and money. On their own they very rarely make any measurable difference and are often worse than the standard units.
Normally I would be sceptical. But there does seem to be an improvement. But maybe it is because the MAF sensor is overfueling. I expect I will be removing it soon to avoid fault codes.
Mike.
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Using some very expensive equipment. Why on earth would you want to? You'd need to do a lot of configuration and adaptions before anything would run properly again. You might even need to have a factory reconfiguration download. ££££s!
Thanks Screwloose.
I have just fitted a pipercross foam panel filter. It has improved the performance.
but the fuel economy has decreased. I have looked on the net forums. They had mentioned resetting the ECU for any mods, but do not advise how. I had heard disconnecting the battery for 30 minutes will reset it. However I didn't want to do this until I had the correct facts.
So resetting the ECU cannot be done using this method.
Mike.
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Mike
Disconnecting the battery will lose all the learned values and risks losing all the useful bits like the throttle body adaption too.
"Resets" are unnecessary as the learned values are not set in stone and will quickly adjust [within a few hours of driving] to any new circumstance.
You don't give the engine code; but most will have a MAF sensor that may well have become contaminated from the new filter and is now overfuelling.
If it's petrol; you may soon have a "long-term fuel trim" fault code appearing.
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You don't give the engine code; but most will have a MAF sensor that may well have become contaminated from the new filter and is now overfuelling. If it's petrol; you may soon have a "long-term fuel trim" fault code appearing.
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Yes Screwloose I think there is a MAF sensor. I don't like the sound of that error code at all.
I did hear someone mention that oil from there filter had effected the MAF sensor.
Can I do anything to clean the MAF sensor and stop this fault code appearing other than
reinstalling the old one? If I replace for the original the MAF sensor will have to be cleaned?
Mike.
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The MAF can be cleaned of oil residue with an aromatic solvent spray, or alcohol, but don't use a halogenated solvent such as hydrochlorofluoroethylene etc... (read the can) The problem is, if it is a heated MAF such as hot wire or film, the oil can deposit on the sensor as varnish.
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As mentioned above, the throttle body settings are lost when you disconnect the battery - an appalling piece of design in my opinion............ It'll run like a dog afterwards. There's a theory that it should relearn the settings over the next few journeys but mine didn't seem to.
You can perform a 'throttle body adaptation' procedure to relearn using the VAG-COM software. A version of the software can be downloaded for free though you'll need the necessary cable and a PC to use it (or a friend/mechanic with the same). My cable was about £20 on Ebay.
My MAF sensor was knackered - though not due to a oiled air filter. The symptoms were a strange hesitancy at about 3000rpm. Eventually it wouldn't rev past 4500 at all. I diagnosed it by disconnecting the MAF sensor. The car ran like a dream again except for a lumpy idle. I tried to clean it using pure alcohol as per various forums but without success. An exchange was about £75 from the VW dealer. It's about 1/2 an hour to replace it.
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