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May 20th, 2019, 06:51 AM   #11
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Originally Posted by Kawasaki108 View Post
How would I be able to check if my ecu is responding?
Im not sure about the US models. Does the the instrument light up and the fuel pump prime if you crank it? On euro models it will if all is well. So that would be a way to see if the ecu is responding, Im thinking.
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May 20th, 2019, 11:43 AM   #12
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Iíve checked and disconnected the kill switch. Still no luck. Any other ideas? Iím pretty stumped. Just donít want to buy an ecu if that isnít the issue. They arenít cheap!
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May 20th, 2019, 11:45 AM   #13
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No, no fuel pump prime, pretty much nothing from the bike at this time. All it will do is crank over when the starter button is pressed. No signs of life anywhere else.
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May 20th, 2019, 03:25 PM   #14
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Oh darrn! Can we collectively help think this one out guys?
If you unhook the ecu will it still crank the engine pressing the start button? Unhooked Y/N
Never tried it and Id think no even on a working bike, can someone try and verify this on a known working bike?
Worst case I can test myself tomorrow, as my bikes are kept in a bunker away from home in the "new" sweden.

Originally Posted by Kawasaki108 View Post
No, no fuel pump prime, pretty much nothing from the bike at this time. All it will do is crank over when the starter button is pressed. No signs of life anywhere else.

Last edited by TomTom; May 20th, 2019 at 03:52 PM.
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May 20th, 2019, 05:43 PM   #15
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Do you have a wiring schematic? Should be in the back of your owner’s manual. The starter engagement is just the first step of the starting procedure. It’s pretty much a hardwired relay situation.

What needs to happen simultaneously is the ecm gets powered up, sees a tach signal, and authorizes the start. I would verify you have good grounds going to the ecm connector, and check for power on all pins that require it.

If your bike doesn’t have a stand alone ignition switch, then it has a main power relay not being turned on, which would power the ecm.

Without the bike in front of us, and looking at the schematic, it’s going to be tough to diagnose here.

The good part is the problem is present, so at least it’s not an intermittent thing. I would start with physically checking your ground wires on the frame. Not just visual, try to move them, wiggle them, etc.
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May 20th, 2019, 08:36 PM   #16
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I don’t have a wiring schematic, the manual the bike came with doesn’t appear to have one. It just has basic information. I may have to buy a shop manual if I can’t locate one online. The bike does not have a key so it is powered upon pressing the starter switch. If there is a mail power relay separate of the starter relay, I am unsure of its location.
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May 21st, 2019, 12:53 AM   #17
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Also I unplugged the ecu and the bike will still turn over. Checked all wires going to ecu and blk/whi wire I believe in position 12 in the ecu plug is the only wire with constant power. Is this correct? I’m starting to think it might actually be the ecu.
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May 21st, 2019, 01:58 AM   #18
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This isn't going to be an easy one as I'm royally failing to find a wiring diagram for your bike. The closest I can find is a Husqvarna FE501 from 2014 or a Husaberg FE450/570 from 2016 (I think).

Either way, before you remove any more hair, have you looked at the starter relay? I believe there's a fuse hidden in there that looks as if it supplies everything except the starter contacts...

I'll post more when I eventually find a real wiring diagram!

Cheers... Paul
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May 21st, 2019, 03:07 AM   #19
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Originally Posted by tinwelp View Post
This isn't going to be an easy one as I'm royally failing to find a wiring diagram for your bike. The closest I can find is a Husqvarna FE501 from 2014 or a Husaberg FE450/570 from 2016 (I think).

Either way, before you remove any more hair, have you looked at the starter relay? I believe there's a fuse hidden in there that looks as if it supplies everything except the starter contacts...

I'll post more when I eventually find a real wiring diagram!

Cheers... Paul
I am terrible with searching for stuff like that, but wouldnít a KTM 500 xc/exc be the same or similar to the OPís bike? That may expand your search options.
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May 21st, 2019, 03:35 AM   #20
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Originally Posted by eeazye View Post
I am terrible with searching for stuff like that, but wouldnít a KTM 500 xc/exc be the same or similar to the OPís bike? That may expand your search options.
I would definitely think so yes.
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