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Discussion Starter #1
Hi all,
I am just done with some customization of the bike and was about to test fire the bike to listen to the new exhaust... Nothing happened, the bike is completely dead as if no electricity going to the bike. Funny part is when I first connected the battery the red engine oil light lit up, but when I inserted the key and switch it on nothing is happening, the red engine oil light went off and nothing, zero, nada....
Checked all fuse, all good. All wire connection are normal.....
What am I facing here? Dead ECU? The bike ran perfectly before the body, exhaust and wheel mods...

Thanks in Advance

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Did you remove the battery during the mods? If so check it's in the correct way round - very easy mistake.


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I'm with Gremmin, you either put the battery in backwards...these batteries go in on their side with the negative(-) pole facing forward...or you haven't hooked up all of the wires.

Recheck your work against the images in the workshop manual.
 

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Discussion Starter #4 (Edited)
I have checked the obvious including fuse, relays, every single wire connectors, possible pinched handlebar wire, etc. I marked every single connectors I unplugged so there is zero chance of that mistake. I went as far as opening the speedo checking the continuity on the PCB board one by one, checked the pins on ecu for continuity from top rows to bottom rows all checked out ok (as far as my knowledge and the ex MV mechanic working with me on the bike). We suspected short on the wiring harness going to the brain (speedo) because when the ECU harness being disconnected and we give power to the mains the red oil warning light on the speedo remains lit.
I will work together with the ex MV mechanic tomorrow to check all continuity on all wires going to the speedo and possibly every single wire on the entire harness.

We highly suspect short on wiring, I have worked with various bike brands for ages and by far MV use the skinniest wire compared to other brands...so I think this is a real possibility....oh, they also mix and match connectors, I found out that the charging system regulator wire connectors is an el cheapo non waterproof wiggly white plastic type and mine is completely melted effectively being welded shut by the melt *LOL*....gonna change that out to proper waterproof connector tomorrow. But I still love MV :) Fortunately I am immune to the agony of working on my rides (cars and bikes) for ages, so let the adventure begin!!!

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What did you do that would have caused that?
 

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Discussion Starter #6 (Edited)
What did you do that would have caused that?
Nothing, I did not touch any wire nor any system other than completely disconnecting the battery, speedo, tail light and headlight before I work on the bike.
I only modified the body with vinyl wrap, changed the wheels, modified the exhaust, Handlebar riser and nothing else... All are bodywork.

Nothing to brag about but I been working (for hobby) on various bikes and cars including electrical system, once went as far as performing simple repair on fried ignition resistor on a Bosch Porsche ECU, so I know my way around a fuel burning contraption and this is the strangest of them all. I really am scratching my head. Have to admit this is the first time ever I work on an Italian exotic and boy what a first challenge

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If you did nothing that would affect the wiring harness at the point that you "suspect" there may be a problem, then you are not looking at what may be the problem's cause. You are guessing.

The problem will be found within the work that has been done. It is the mantra of all things that go wrong: Whatever was done has caused the new problem.

Take a picture of the battery compartment...the battery and the connections... for me. Be a sport!
 

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Discussion Starter #8 (Edited)
At first I suspected the exhaust guy playing funny connecting the battery terminals perhaps being curious with.such an exotic bike then after accidentally left it connected or touching while welding the exhaust but upon further inspection on the critical parts (terminals/connectors/speedo/ECU/relays/fuses) I can't find anything that give that indication. There must be something with obvious sign of being fried if this was caused by the welder with that megavolt welder if it was the root of the problem.

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Discussion Starter #9 (Edited)
If you did nothing that would affect the wiring harness at the point that you "suspect" there may be a problem, then you are not looking at what may be the problem's cause. You are guessing.

The problem will be found within the work that has been done. It is the mantra of all things that go wrong: Whatever was done has caused the new problem.

Take a picture of the battery compartment...the battery and the connections... for me. Be a sport!
Yes the best I could do is guess right now for I am 100% sure I put A back to A and B back to B, I am very particular about that matter. Like I said on the otjer thread, the helpers are only doing the heavy lifting and I do all the critical parts.

I did the mantra you mentioned and for the life of me I can't find any explainable fault/mistake. The logic behind my suspicion is due to the quality of the wires being used, I was thinking that perhaps all along I had a time bomb on the harness waiting to explode and it exploded right now coincidentally at the same time I did my mods... All guess work right now sad to admit. But seriously I did not touch any vital parts at all and yes I have checked and re checked the battery connectors, minus to minus and plus to plus, plus terminal and wire facing rear, I still remember it like it just happened a second ago. The saying opening a can of worm came to mind right now...

I am home right now, it's 9:36PM here *LOL*. I will document and record as much as I can tomorrow and post it here.

Thanks a lot Chuck, you've been very supportive.... Love the forum

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If your ECU was in the bike, and the welder was welding directly on the bike, and the ECU was not isolated from the bike, that could be a cause.
 

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Discussion Starter #11
If your ECU was in the bike, and the welder was welding directly on the bike, and the ECU was not isolated from the bike, that could be a cause.
The welder wasn't welding directly on the bike but there were some mockup work for the pipe done directly on the bike.

It doesn't look like the ECU because the bike is completely dead except for the little red oil light. My previous experience dictate that failed ECU does not cause a vehicle to be completely dead, just unable to fire or unable to run right and mine is completely dead. But I never had any experience with completely fried ECU before or maybe I am just in denial *LOL*....

I am hoping that ECU is not the cause but perhaps you are right. If this is the case then it is totally suck. This is my only bike at the moment, major public holiday where Jakarta street will be completely free of traffic for two weeks is coming up and Chris X-Bikes does not have anything on stock until end of June. If this is the case then this will be the second year where I have no fun vehicle to roam the street of Jakarta when the street is empty :(

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My bet is still on battery hook-up being reversed.
 

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Hi Uwiik, as per Chuck's request, please let us help you by taking a few photo's of the battery and surrounding areas. Thanks buddy.
 

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Discussion Starter #15
Yes sirs, 7:23 AM and just woke up half an hour ago. Will start working on the bike again in about 1.5-2 hrs from now.....will post pics

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Discussion Starter #16
There you go. A bit messy from me checking all the connections. Voltage regulator was purposedly disconnected due to the melt on the connector shown.





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Discussion Starter #17 (Edited)
Checked continuity on wiring loom based on the service manual diagram. All checked out ok. Sad to say i think i have either fried ecu or speedo....

I'll continue to work on it and if proven to be a fried ecu/speedo I'll make the best out of it and go all out to make this bike a Frankenstein, custom ECU with external TC switch with the help of Chris Xbikes, disable the Immobilizer, make custom speedo with built in data logging, and all bells and whistles... I hate the look of the stock speedo anyway.

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I'd look again at the connector by the 40amp fuse. Double check the fuse, you know there are two there, one being a spare. That connector is also a common melt point and looking at the tape on the wires it might have melted before. Mine melted quite a way back down those wires and had shorted out across a few of them.
 

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..the old the 40amp fuse issue..
 

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...however, what I didn't comment on earlier was reconfirming that you'd used a wrap on the tank/fairings? - did I read that correctly?
 
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