• 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 4st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

450 No Power from the Power Relay

T

Tcops

Husqvarna
A Class
Hi all,

New member with a couple of problem bikes, the other in the 2st thread. So, this one threw up an injector fault on the computer and was passed on to me as a new injector didn't fix it!

Delved into the wiring and found a few corroded connectors and earths so sorted them, then with the voltmeter out I find no power on the infamous green/red wire which powers the injector, pump. and coil. Mentioned here:

http://www.cafehusky.com/threads/08-te-450-problems-after-minor-rebuild.31469/

The power relay is faulty of course! um, no its working fine on the bench, and swapped with another to make sure.

To cut a long story short, the ECU is not dragging the control wire down to earth to switch on the Power relay. If I manually short this lead to earth everything turns on, fault goes, all good!

What could stop the ECU from turning it on??

Thanks for any suggestions
 
Shorted wire from the ECU to the relay? With this bike, you dont need to be an electrician, you just have to look at the key wires, the entire length of the wire including the kill switch
 
Hi. I have checked very thoroughly all the wires for open circuits, shorts, repaired any connectors needing repairing, done it all again, and again. What would stop the ECU pulling down the relay control to turn it on?
 
So an update on this - managed to borrow an ECU off a 510, fitted it and hey presto the power relay turns on, and I even started the bike briefly to prove a point.

Swapped back and forth a few times just to be really sure, and yes definitely a faulty ECU.

BUT... they are no longer available to order new ......

Ah.

So currently on the look out for a good s/h one, in the UK.
 
Thanks for the update Tcops. I seem to have the exact same problem on my bike so this is reassuring in the sense that I believe I have found the fault. I was hoping it wasn't going to be the ECU but everything started pointing to it. Was fine one day, and the next day bike just wouldn't start. Didn't hear the fuel pump priming so thought something was odd since hadn't even moved it since last being started. Pulled the tank off and found the constant power supply to the relay to be corroded so thought this would be it hopefully. Fixed the dodgy connectors and still no good. Power from the switch is ok, constant power is fine, but the earth through the ECU is no good. Manually earthed out the Yellow/Green wire and power supply came back to the pump, coil and injector. Tried to bypass the line leaving another earth hooked up to see if the bike would start, but didn't, so guess the ECU has to see the earth for it to start. Am chasing an ECU to borrow to swap out and test just to be sure. Hopefully the dealer has one I can borrow for this.
 
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