Hi Guys,

Apologies if this has been discussed, I did do a check......

I recently brought a new ECU off ebay for my '04 model to help with the surging. It's the ECU 5VK-8591A-00 with the white dot.

When fitted the bike won't start and displays error 54. The old ECU works OK.

Is it duff or do I need to reset something first?

Thanks in advance.

biaggi,

Best wait until Kev comes online for the true technical answer but i do seem to remember that if you change ECU's you need to make sure that the keys match or come with it and the RED key has the brains in it as well mate.

Hope i'm not confusing the issue but if my memory does serve me correctly then did you get keys with it??

WB

Check this link for recoding keys if you change your ecu.

http://www.xt660.com/showthread.php?p=26758#post26758

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Just a quick note to remind everyone that Kev has a busy schedule and can only reply "one 2 one" to xt supporters. If the answer is not in our accessible areas of the forum to non subscrivers then Kev can't reply.

You need to recode the keys using your red key, if you renew the ECU.

One thing to watch out for & I have warned the XT forum before, you can't swap over ECU's from bike to bike, you can only install a new ECU.

So if that Ebay ECU was ever coded or used to start another bike it can't be fitted to your bike. So you need to make sure that the Ebay ECU is really a new one, if the keys won't code then it was coded to a second bike before you bought it, it will display error code 54.

You can buy a brand new 00 ECU with white paint dot from Holland for 66 pounds, I know I just done it a few months back & my bike is running with it right now.

For any further help you would need to as in the ASK KEV section, to be fair to the supporters.

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
[
My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946

Thanks for the feedback, much appreciated.