Training Wheel Hero
Join Date: Jan 2015
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No power to fuel relay. Please help
I have an 04 CBR600RR and I was riding it a bit hard on some twisties on a mountain road and she just suddenly lost power similar to the kill switch being set to off position while riding. I pulled over checked all fuses and ended up having to put the bike on a trailer and tow it home. I did have to order a new battery as the old one was pretty much dead from trying to get it to start. Battery also wouldn't hold a charge.
First thing I did was check fuses and they all were good, then I swapped all the relays and still it didn't want to start. After some voltage readings I discovered the fuel cut relay wasn't getting ground signal from the ECU through the brown/black wire. So I researched and found a wiring diagram to help me out with the wiring.
The fuel pump runs if direct power is supplied to it. Also jumped the fuel cut and starter relay and the fuel pump primed but didn't start
I called my friend to have my ECU tested on his bike and his bike started without any hesitation. Next thing I checked was the zener diode which I found out by reading forums. I am getting 9 volts on the zener diode in the ignition through the pink wire.
I checked the yellow box under the fuel tank and they all have continuity. Also the FI fuse near the battery is good but I changed it out just to be sure.
To test the BAS I turned the ignition to on position with the BAS removed from its mounting point and turned it sideways to see if it would activate the start relay and both left and right caused the relay to click which eliminated the BAS (Also by reading forums)
The kill switch activates the start relay and also cuts out the headlights when I try to start the bike.
I am stumped and my bike has been down for just over 4 months now. Any input would be greatly appreciated.
Sorry for the long post but I hope I got everything written down.
Thank you everybody.
Last edited by CBRrox; 01-15-2015 at 11:11 PM.
Reason: Added more information