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Faulty ECU affected range
2 Attachment(s)
The 2 attached documents I have got from JMC are leaked internal Yamaha UK memos to all dealerships and service workshops.
They show the range of the faulty ECU's up to frame number related, best thing to do is to check if your frame number falls within this range and if so print these 2 documents and take them to your dealer and they shall have no problem in sorting you out with a new ECU The quality is not perfect but you can just about make out the frame numbers. Sorry but this was obtained by a mechanic and not officially from Yamaha. For the benefit of all please note these are the affected frame numbers XT660R Up to frame no. DM015-007858 XT660X Up to frame no. DM014-006257 And thanks very much to JMC for helping me with this even though now you are on the other side of the world, its great that you kept these things safe. |
When you say faulty do you mean-cutting out because i think that my XT-R is in that range(it is 2005.) and it's not cutting out
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The old saying: "if it ain't broke don't change it" means you are one of the lucky few so don't worry. or..... perhaps your bike was within the range and if you have bought it 2nd hand someone has already changed it or... Yamaha replaced it from the dealership before selling it to you. Open the right hand side panel under the seat that covers the air box and read the number on the ECU to see if its the new or old one. |
I am first owner,bought it in july last year,i will check that number Thanks for fast reply
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I didn't saw nothing on right side,i think that you ment left side because there is something that looks like ecu if i am not wrong
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depends on your definiton of left and right in relation to the bike lets simplify this by saying look on the gear lever pedal side of the bike as opposed to the brake pedal side, i.e. the side where your chain and sprockets are. :icon_eek:
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:happy8: Thanks for fast reply,as far as i see those numbers(very hard) mi ecu has other numbers,it looks that i am lucky one :icon_salut:
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Anyone who can read the frame numbers and the ECU number? And post them?
I think I have a bike with lower number... but it's so hard to read... Thanks |
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XT660X Up to frame no. DM014-006257 There is no specification for ECU number in these pages, all you have to ensure is that your frame number is higher than the two numbers above. If not, contact your dealer. |
Does anyone know how to tell the difference between the old ecu and the new one?I have a 05 xtx purchased new,my frame number is on the lower side which means I should have the old ecu,but I haven't had any of the problems associated with it! I am wondering did the dealer change the ecu before I took delivery.
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My frame have 3 numbers more but it starts with 011
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If Someone Get Those Numbers Of Ecu Please Post It Here Because That Is The Best Way To Check
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1 Attachment(s)
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In japan, ECU number of XTX(2005model) is old type. So, I think that, at this moment, old number ECU was rewritten to new program. At this moment, both number are listed on Yamaha parts number list. sorry, japanese site... http://www.yamaha-motor.co.jp/parts-search/index.jsp both costs 46620yen! |
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The old and faulty ECU is : 5VK-8591A-00 whilst the new and corrected should be: 5VK-8591A-01 Thank you Buhi |
Just to add fuel to the fire,I have just checked my ecu no. and it turns out to be the old one! But yet I don't suffer any of the symptoms.When I took delivery of the bike new, it suffered from slight surging ,so I did the usual. c.o.setting t.p.s and a.i.s. this worked wonders! Since then, Race pipe, k&n,snorkel removed, drilled airbox and more co2 adjustment, in my mind this has fixed the bike.No more probs whatsoever!(touch wood)
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Thanks very much for this information, i have recently purchased a xt-r which has very bad surging and is impossible to hold steady revs in low gear. Bike was booked in for first service this Thrusday and have tried the co and tps changes with no effect i've now put it back to standard ready for service and will go armed with this paperwork.
Anyone have any idea how long the parts take as i'm guessing the dealer wont have stock of an ecu. Also should i expect any resistance or will the dealer simply look up the frame number check with yamaha and arrange to change it. Thanks again for the info and the woderful forum which has been an enmormous help. |
With new ecu the bike will surg too,if you bought it recently it probably have new ecu,changing ecu will not solve surging,my bike have new ecu and it surge,you got to do CO adjustment but it wont eliminate it,i had honda with 2 cilinders and it surged too if i were riding on very low rpm
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Listen guys i don't make any money out of selling these mods i am only trying to help the community here, the Kev Mods are made and despatched by Kev in Australia, I can only suggest you hurry and buy one as there are 3 now available on ebay, bearining in mind that Kev can only make so many at the time due to his busy work. Good luck |
I've not experimented with the mods for fear of voiding the warranty, originaly the dealer told me all servicing has to be done by Yam Dealer or warranty was void, which i've since discovered is not entirley true.
I will get the first service out the way then start looking at the options, bought the bike as an 06 pre reg but by the frame number beggingin 011 i would guess its probably a 2004 build :( |
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People must not get confused between surging & drive line shunt, that comes with a high torque, lean burn, single & twin piston motors. Surging is like an elastic band effect, when the throttle is in a set position you get this light surging feeling. This can usually be fixed with fueling or ignition timing due to emission control or lean burn motors. Drive line shunt as it is known, is the kicking & bucking of the drive line against the engine braking at low engine speeds. That's why you have cushion drives in the back hub to try to absorb this effect. This can not be fixed as it is a characteristic of these bikes. |
Just wanted to update things and say thanks for the info.
PM from member confirmed my ECU was in fact a faulty one, dealer changed ECU and got back the beast today. I would guess its eliminated 75% of the problem and with a tweak on the CO setting another 5-10% like everyone has said it wont get rid of it all but its one hell of an improvment. Anyone that thinks their bike is surging bad really has to ride one without the ECU being changed to see whats its all about. Dealer even said thanks for technical details enclosed in post as they had been scratching their heads over one that they could not sort, seems they have only sold a couple xt's and hand't seen the Yamaha document attached. Thanks again everyone for your help. Tiny |
Where is exactly the frame number and the ecu one guys???I cannot find it!
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Well i got it off the logbook, easiest place to look.
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Can comeone else help me???
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The frame number is stamped to the side of the steering head,the ECU number is on a sticker on the ECU which can be found under the black left hand side panel ,CHECK THIS LINK
http://www.xt660.com/attachment.php?...6&d=1153748325 |
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As Tiny I have XT-R dated with 2006 year but with frame number string with 011 - that could mean the bike is actually 2004. I am about to have the first service, so would like to have the documents you attached while asking the dealer to check my ECU and replace it if necessary. Do you have those documents scanned with better quality � I personally almost can read nothing from them. Thanks in advance. Thanks, Lyubomyr Humetskyy . |
Lubko
i really wouldnt worry when i went into the dealers the fact that i had the documents was enough for them to know they existed and went off in search of their own copy. For a proper Yam dealer they obviously have the access required to get to the original and from what they said once they expalined to the people that deal with the warranty claims what was happening they immediatley knew what the problem was. Tiny |
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Did the dealer have ECU in stock or it took some time until the new ECU were delivered to the local dealer? You also mentioned that somehow you identified that the original ECU was the old one. How did you do that? By the ECU number that finishes with 0 or 1? Lyubomyr. |
Took all in 3 days from taking bike in to collecting it from them, they reckon on two days for warranty parts.
Yep i took the cover off the side and looked at the number ending 0 on the ecu. Tiny |
Guys you dont understand,both ecu's are original(ending with 0 or 1)only the ecu ending with 0 was first that Yamaha was fitting on bike,because that ecu was foulty(it does't mean that every ecu that ends with 0 is foulty) Yamaha made new one that ends with 1,I am first owner and my ecu ends with 1 (2005. XTR)
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Old ECU = Power?
Hi!
Talked to the Yamaha dealer today. A mechanic there told me that the new ECU gave less horsepower, because it`s more rider friendly. The faulthy/old one gives much better power because it`s more "race" set up...He had tried them both....Any one else who has triedthem both??? |
Some guys here have replaced ECU-s and nobody said that
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What`s the first thing you notice about having faulty ecu?
Sorry for my bad english, but can someone explain to me what`s the first thing you notice when you drive with faulty ecu? (explain in simple words please)
What is surging? My frame number ends with ............9978, am I sure that I have the new one then? again sorry for my bad english... |
don't worry about your english PJS,
Surging: you try to ride the bike gently with minimum throttle and your bikes surges meaning it seems like the the power gets instantly cut off and reconnects giving you a triggered feeling of someone switching the engine on and off repeatedly. This only happens at low regimes, not on full revolution. Yamaha admitted in their original report that the old ECU would send wrong fuelling parameters to the injector resulting in the bike burning incorrect fuel mixtures constantly. If this is still not clear to you, Bjorn (Stoppsladd) might be able to give you some clearer explanation in your own language. |
Ecu
Now I understand the word surging bette:)
Thanks |
Frame numbers and ECU
My frame number last digits are ...9978
Ain`t I supposed too have the new ecu then? My bike i cutting power on/off at very low rpm`s when just cruising at low revs..... |
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If you read all the threads on fuelling, TPS etc. you will find that even the bikes with the new ecu's suffer from surging and that is why people either ghet a power commander or a Kev Mod. |
It`s very litlle I notice it. Just with almost nothing throttle on low revs.
Can`t wait to get my Akrapovic cans and DNA Stage 2 filter!!!!! |
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