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Oct 25th, 2011, 6:14 am
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#1 (permalink)
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Member
Join Date: Oct 2010
Location: Brook, Kent, United Kingdom
Posts: 73
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Do ECUs, just 'go'?
Hi Guys,
My ST4s is very poorly and wont start.
Turns over but just wont fire up.
Its had a new CAS and new battery but no joy.
This happened quite suddenly.
Do ECUs just fail with little warning?
I've found someone who'll check it but its £70 which I thought was quite a lot just to plug it in.
Suggestions or help most welcome.
Tim
__________________
2002 St4s, in yellow, all the touring gear, top box and panniers. My first 'big' bike, and I'm lovin' it.
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Oct 25th, 2011, 7:40 am
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#2 (permalink)
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Junior Member
Join Date: Nov 2010
Location: Horsham, West Sussex, England
Posts: 6
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Ecu
The one on my 900ssie was hit or miss for a few months before it went, cost to test and repair my old one was £210 , a member of the DOCGB sold me one for a good price.
__________________
May we never grow old to have FUN 
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Oct 25th, 2011, 10:14 am
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#3 (permalink)
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Senior Member
Join Date: Nov 2007
Location: KINGSBURG, CA., USA
Posts: 452
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What is!
What is a CAS ?
__________________
2007/ducati-ST3-S-ABS 2002-Honda 250
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Oct 25th, 2011, 12:20 pm
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#4 (permalink)
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Ducati Designs
Join Date: Jan 2004
Location: Beaverton, Oregon, USA
Posts: 768
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I think he meant "CPS" (crank position sensor), same idea as crank angle sensor on some cars.
2002 ST4S ecus had some reliability issues, although a lot of them failed after running, or would not restart when hot.
You need to make sure the CPS gap is set correcly; this is noted in the service manual. There are shims under the sensor that you can swap around to set the gap. Too wide a gap and it won't detect properly. Too close and it can get ground down.
A thorough check/clean/dielectric grease of all connectors, relays, grounds, etc. is always a good idea periodically.
pg
DD
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Oct 25th, 2011, 4:46 pm
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#5 (permalink)
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Senior Member
Join Date: Aug 2009
Location: Cortez, Co, USA
Posts: 180
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Quote:
Originally Posted by TT Tim
Hi Guys,
My ST4s is very poorly and wont start.
Turns over but just wont fire up.
Its had a new CAS and new battery but no joy.
This happened quite suddenly.
Do ECUs just fail with little warning?
I've found someone who'll check it but its £70 which I thought was quite a lot just to plug it in.
Suggestions or help most welcome.
Tim
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Tim,the P/O of my 02 ST 4s had 3 ECUs replaced under warranty,this one seems to be doing fine, for the last two years,no problems,although I dont want to be riding to far from home,sort of warey about being stranded in the desert,500 miles from a dealer,there was obviously some problems with theseECUs.How about a "reflash",dont know much about that,but they can be reprogrammed,I guess ,Cheers,Dave
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Oct 31st, 2011, 1:05 pm
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#7 (permalink)
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Member
Join Date: Feb 2010
Location: Simpsonville, South Carolina, U of A
Posts: 32
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2002 4s ECU
I have an 02 4s as well. I purchased a "brand new" reflashed ECU from Houston Superbikes for $495+ shipping before I identified my problem as fuel.
This has never been on a bike and is the stock map w/o imobilizer.
Been waiting reach "30 posts" before forum will let me post something for sale??
If interested I'll sell it for $350usd.
PM me if you want it.
Thanks
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