cant connect power-tuner to ecu

4 replies to this topic
  • svemo

Posted July 14, 2013 - 04:17 AM


own a YZ450F-2012. bike stopped working to today and wont start. have checked sparkplug: no spark, dry plug so no fuel. When I connected my power-tuner to bike to see possible fault code, the tuner wont even start (power tuner starts not connected to bike, so batteries should be fine).
I guess my ecu broke, any suggestions?

  • grayracer513

Posted July 14, 2013 - 06:32 AM


Change the batteries anyway. The additional current required by the ECU may be enough to bring them below the minimum voltage required to run the tuner.

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  • svemo

Posted July 14, 2013 - 08:59 AM


I changed to recharged NiMh batteries: Nothing happens when I push startbutton on the power-tuner connected to bike.

Before bike went completly dead, It stopped a 5-10 times, just as running out og gas, or using killbutton.

  • grayracer513

Posted July 14, 2013 - 03:46 PM


Maybe the ECU is dead, then. Do you have a friend with a similar bike you can try a swap with?

Check the entire harness for damage, like a wire pinched between something where it can short, too.

  • svemo

Posted July 14, 2013 - 10:34 PM


problem solved, cable to rear brakelight was loose and touching exhaustpipe.

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