M620 no spark with key on more than 10 secs

[mantzas]

Hallo from Greece!
I bought a 02 Monster 620 on january, crashed it and now riding it again.
My problem is that sometimes it won't start. I can't determine when and why just sometimes it won't get spark and doesnt start.
So another problem that maybe related is that if i turn the key on for more than 10 secs and less than 15 ofcourse, the ecu cuts the power to the coils thus no spark is created to ignite the engine.
Is there a module or parameter in the ecu that will cut the coils power after 10 secs?
Thanks!

[Howie]

Yes, the immobilizer cuts power after about 15 seconds.  Turn off, remove key, try again.

[SpikeC]

 Battery!!!

[mantzas]

No, I'm not talking about the immobilizers 15 sec I;'m aware of this fuction.
If i push the start button 10 secs after key on it cranks and sends fuel normally the only thing missing from the equation is the spark!
I traced down the wiring and found that the power to coils is cut by the ecu.

SpikeC have you heard of this problem before? How are you so sure it's a battery?

Thanks

[SpikeC]

 Based on numerous threads on this site regarding similar issues. How old is the battery? Does it live on a battery tender? Has it been load tested?

[mantzas]

If i turn the key on and off again and press start button quickly it starts no prob
No battery tender, i dont know how old the battery is since i bought it second hand.
How can i load test it?
Thanks

[Howie]

You can either bring the battery to a shop (preferable) since most of us don't have a load tester or do a shade tree (not as good) test.  Hook a multi meter  across your battery, set on DC volts.  Remove fuel pump fuse so engine dos not start,  Crank for 15 seconds.  Voltage should stay over 9.6 volts.

SpikeC does accuse the battery for everything, but this time he might be correct.  A marginal battery can cause this.  If the battery tests good move on to connections and ground.

[mantzas]

Ok, i will check the battery tomorrow, but if I'm going to check the wiring I have to trace the current to the ecu, as everything is ok after the ecu.

[brad black]

the cheap way is to press the start button within 10 secs of key on.  how hard can it be?

the expensive way is to fix it.

[mantzas]

Yeah thats what i do, but the problem is that sometimes it doesnt start from the first time.
And it will not start at all no matter the seconds.
I just think i have duplicated this condition by letting the key on for more time.
Thanks

[mantzas]

Checked battery and seems ok.
Lights on, spark caps off, cranking for 15 secs and voltage didn't go under 12.7
Any ideas?

[Howie]

OK, the battery is not the problem.  How are you determining no power to the coils after 10 seconds?

[mantzas]

Connecting the voltmeter to the coils. When I push the start button they should have 11-12 volts but mine have 0-0.5 v after 10 seconds.
If i push the start button earlier they are ok 12v and spark plugs fire.

[brad black]

i'd pop another ecu into it and see if that fixes it.  if it doesn't start moving downstream from there.

[suzyj]

It might be worth checking that he ecu is properly bolted down to its heat sink. Running the coils continually draws a fair bit of power, which goes through big transistors in the ecu. They're probably overheating and shutting down.

That said, I don't think it's reasonable to expect the ecu to drive the coils continually when you're not trying to start the bike. If I was coding it, I'd put a timeout in for self preservation.