CBR 929 ECU dead ?

[vitus detritus]

Well guys I've f#@ked it now. Having replaced stator & reg/rec my CBR 929RR worked like a dream. Except for the hot stator cover. I had installed a sub loom to take the output of the reg/rec direct to the battery (with +ve via a 30 amp fuse). Battery charging was great at 14.7 on tickover. So I was going through the loom checking connectors for corrosion etc. to try and find the source of the big current draw and having done that I put the battery in, connected everything up but FORGOT TO CONNECT the +ve (existing loom) to the battery and only connected the -ve part of the sub loom direct from the regulator output +ve. Bike turns over twice and then I hear a 'POP'. It blew the fuse in the starter relay. Replaced that, now the bike turns over but no fuel prime and a big red light on the dash. I have heard that this kind of mistake blows the ECU. Anyone know how to check for a fried ECU ? I could kick myself.......
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if it ain't broke, don't fix it

[Easy-X]

Most ECU bikes have an engine warning light that comes on (steady) until you start the bike.

Warning light flashing = ECU upset

Warning light not on at all = ECU dead
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[vitus detritus]

I hope you're right. The dash lights up as normal but big red light stays on and no fuel pump prime whine. To be honest I'm so disgusted with myself for the schoolboy error I can't bear to think about it.
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if it ain't broke, don't fix it

[BusterGonads]

[WD Forte]

Tried to improve it and made it worse
Yep, been there done that.

S/hand one cheap?
Yes buy one and be careful next time
No?
You'll have to start with a wiring diagram and meter
to check through the system.
If it looks like the ECU is unresponsive and you really have fooked it I'd be digging the innards out to see if I could repair it.
It might have a discrete component blown that can be replaced
If it has any programmable/logic ICs blown its probably dead Jim
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bikers smell of wee

[sickpup]

If you didn't connect the + cable from the starter relay to the battery how did the bike get power?

[vitus detritus]

Although I forgot to connect the +ve from the relay, I did connect the +ve from the output of the reg/rec. Have a read - https://www.triumphrat.net/maintenance-and-workshop-talk/68040-weak-charging-system-the-solution.html
Please note that my misfortune is entirely due to my stupidity - and their hack works, and works well. I got 14.7 v measured at the battery before I went looking for other earth issues and forgot to hook up everything correctly to the battery. Twat.

I have since discovered that there is a diode in the ignition and there is a slim chance that I popped the diode and not the ECU. I will investigate and report back.
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if it ain't broke, don't fix it

[Robby]

Without a wiring diagram, its hard to understand what you have done.

Have you checked the other fuses?

[sickpup]

[vitus detritus]

Hey Sick Pup
no, I ain't lyin'. On the reg/rec side of the loom, there are two positive wires and two negative wires that connect to the standard connector. There is also a third positive and negative, which I added that go from the reg rec loom to the battery direct. When I popped the starter relay fuse, all negatives were connected, but I only connected the added on +ve, not the +ve batter terminal of the bike (which connects the relay I think).

So although it got power to crank, it must have done so via the loom, not direct from the battery.

What is a 'pattern' ignition ? Do you mean 'aftermarket' ?

I am going to have a look at the ignition and patch in a 9 v battery to the ECU and see if the fuel pump primes. If not, it's a fair bet I've popped the ECU. But that still wouldn't explain why the stator was getting hot - which I suspect is a bad earth somewhere - which, apart from my stupidity, is why I'm here in the first place. Any suggestions gratefully recieved.
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if it ain't broke, don't fix it

[Robby]

I'm still not understanding how you have it wired.

To pop get it to crank, and to pop the fuse on the starter relay, you have to have some kind of connection between the battery positive terminal and the starter relay. I'm assuming that the current was flowing across some of the thinner wires in the loom, instead of the big thick wire direct from battery to starter relay.

Have you checked the other fuses on the bike?

[vitus detritus]

It's wired the same - just with add-ons from reg rec to battery direct. The error was not to connect the usual +ve battery connection.
Yup - all fuses OK now - unless I missed some at the front of the bike. But when properly connected up, it turns over, but no fuel pump whine - so not looking good for the ECU - unless it proves to be the 9v supply to the ECU. Too busy to check it now, but I'll have a go this weekend.
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if it ain't broke, don't fix it

[Kawasaki Jimbo]

I also can't make sense of this although I wouldn't leap to the conclusion that the ECU is shagged, but what's this about a "big current draw", and won't the stator cover be hot because it is splashed with engine oil?

[vitus detritus]

Hi KJ
two separate issues -
The original issue was a hot stator. There is something wrong with the loom somewhere which is causing the Stator to get hot. And I don't mean engine hot. I mean stupid-hot.

It was while I was looking for the issue that I apparently short-circuited the bike. How I did this is irrelevant really. What is relevant is why the fuel pump no longer primes.

Everyone has been most helpful but the only way I can delve into the mystery now is to run some tests and determine if the ECU really is fried.
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if it ain't broke, don't fix it