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Old 10-29-2012, 04:22 AM   #1
Thruan
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Default Engine cutting out

Hi all.

04 Mv Brutale 750.

No this isnt another 'stalling' issue. This is different. I THINK

Ok, quick back story..
Had a severe miss, and alternator issues.. The miss was traced to the fuel system.
The alternator issue is that the ECU isnt sending the 'charge' signal. 'solved' this, by feeding the sense wire battery voltage (same thing the ECU does) directly.

All was good. reved fine in the driveway, alternator is charging like it should. everything was working.

Took it for a ride and all was perfect.. then as i slowed down to stop at the lights, it stalled.. restarted and it was fine, then half way round the corner it stalled again as i changed into 2nd.
Had to push it all the way home.. About 600m in 34 degreeC heat..

From then on it would start, but will not rev past 2200 rpm. It sounds like a kill switch being pressed. starts and idles fine. It revs fine as long as you keep it under 2200.

But as soon as you touch 2200, down she goes.

I have used Adams MIAW software to log whats happening, and at 2200, everything drops to 0. I can post a log if anyone wants a look.

Does anyone have any idea what could be going on?
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Old 10-29-2012, 04:27 AM   #2
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Here is the part of the log when it dies.

I was very very slowly bringing up the revs.
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Old 10-30-2012, 08:37 AM   #3
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One thing I can think of is that infamous SPU, which you have already said had a problem with the charge system......
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Old 10-30-2012, 05:33 PM   #4
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From what I have read/found, the SPU doesn't have anything to do with the alternator, the ECU controls it.

All the wiring diagrams have the sense wire going to the ECU.

I haven't ruled out the SPU, but I have the black back, and haven't had any electrical issues with lights or indicators. Which is why I've been looking at the ecu instead.
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Old 11-06-2012, 04:33 PM   #5
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Quote:
Originally Posted by Thruan View Post
From what I have read/found, the SPU doesn't have anything to do with the alternator, the ECU controls it.

All the wiring diagrams have the sense wire going to the ECU.

I haven't ruled out the SPU, but I have the black back, and haven't had any electrical issues with lights or indicators. Which is why I've been looking at the ecu instead.

Looks like the battery is still dead level at 12.19v even when your holding 2000rpm, it should be 14.4v, are you sure it is charging?

Can you upload the actual log file ?

Cheers
Adam
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Old 11-06-2012, 05:19 PM   #6
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Hi Adam.

Yeah it still reports as 12.9v. I think this is the same cause/ is the cause, of the alternator not charging via the ecu sense wire.

The alt is certainly charging, can't remember the figures off the top of my head, but I was getting ~13.9v (I think) at 2000rpm.

I have battery voltage going to the sense wire of the regulator, mimicking what the ecu is ment to do, and it has been working fine in the shed up to 7000rpm repeatedly with no issues.

It was only once I took it for a ride that this issue started.

Actually that reminds me, my 40amp charge fuse popped at one point of the bike playing up on the ride, the charge light on the dash come on, it wasn't the first time it stalled, but at some point shortly after.
I have replaced the fuse, and it is showing normal charging behaviour up untill the cutout.

Ill post the full log tonight when I get home.


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Old 11-07-2012, 04:06 AM   #7
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Hi Adam.

Here is one of the logs.

I dont think its the same one as i Screen shotted, but still shows what happens.

Had to change it from a .log to get it to upload. Not sure if that effects you.
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File Type: txt 121029175119.txt (12.9 KB, 43 views)
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Old 11-07-2012, 02:39 PM   #8
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Quote:
Originally Posted by Thruan View Post
Hi Adam.

Here is one of the logs.

I dont think its the same one as i Screen shotted, but still shows what happens.

Had to change it from a .log to get it to upload. Not sure if that effects you.
You can see from the log that it dies every 10secs or so.
The first couple of times it came back up.

Why did your 40Amp fuse blow and why do you always have 32 errors showing in the history ?.
I think you need to get that original charging fault sorted as well.

It all points to the spu, everything goes throught that, the alternator, coils, the lot...

Cheers
Adam
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Old 11-08-2012, 03:52 AM   #9
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Hi Adam. Those drops in revs don't happen in real life. I have other logs where it doesn't show it. I was watching the log when it dropped, the engine stayed at the same revs. Didnt hiccup or anything, I think it was a communication error.

Those 32 errors will not clear no matter what I do. And it's always 32. It has never been another number since I started using your program months ago, bike has been started and run many dozens of times since first using MIAW, and it's still always 32.
Different chips, ecu has been on and off the bike 10+ times, disconnected for weeks at a time, the 32 errors are always there.

I don't know why the fuse blew, I have a new fuse in and it works fine, hasn't blown, but I can't get it past 2200.

The alternator doesn't go through the SPU, at least not on any of the wiring diagrams I have?
The problem with it not charging was the sense wire (which goes to the ecu) isn't being turned on. If I give that wire battery power (which I have done, and this is the way most alternator regs get their 'charge' signal) the alternator charges fine, and when it was revving, the volts come up like they should have, and maxxed out at 14.something.

I'm also not having any other electrical issues, lights, indicators, dash, everything else is working.

I'm leaning towards the ecu rather then the SPU because of the dead alternator sense wire, and the 32 errors that don't exist/won't clear.

I value your input on this Adam. just wish I could fix the dam thing.


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Old 11-08-2012, 03:56 AM   #10
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Oh, and it always dies at the exact same revs, 2200.
It will idle for 5+ minutes, and will run for 5+ minutes while lightly revving it,
But as soon as you hit 2200 it's gone.

If it was random, i would think its the SPU, but being its so precise, 2200rpm, time after time after time, makes me thing it's not.

Oh, I have tested it with the alt fuse out, to make sure the alt wasn't pumping 16v through or something, and it still does it.


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