energyhutch wrote:Does the Hall sensor need to be connected in order to start the bike? Bit stumped here. When we press the starter we can hear the load shedding relay switching, but the starter relay doesn't. When the starter isn't pressed we have -4 V over the starter relay power wires, which changes to 0 V when we press the button. Wiring between the starter, ECU and ICU tested OK, but can't find out where the half power is coming from. I wonder if the ICU is the issue....
I'm trying to help Hutch here, but look like an ass :-)
Anybody, please help, thanks!
Rene (hfxrzw)
Before I will atempt to answer the question I will need to know what model bike it is. I presume it is a K100 8V.
You will notice that many put the model of bike they own in the signature line which saves you typing it repeatedly and others relying on an often failing memory.
The bike should turn over on the starter even if the hall sensors are disconnected but will not of course start.
When the starter button is pressed an earth is extended to the fuel injection relay for 1.5 seconds and by that time the engine should be turning and recieving signals from the hall sensors and will continue to extend that earth. That earth also lets the fuel pump relay operate making the pump run.
The load shedding relay can only release if the starter relay is sending 12v to the starter and that happens when the starter relay operates. For the moment dont even consider the operation of the load shedding relay as that will not stop the engine starting even if it does not release.
Check that when you press the start button you get 12v at the black/yellow wire at the start relay and that there is an earth connection on the brown wire in the same 2 pin plug. if you get that 12v and the relay clicks then check that you get 12v at the terminal on the starter motor. It should be no less than 10.5v
I suspect that there will be no 12v at the starter which will mean the starter relay is cactus and not contacting.
If you are getting a negative voltage reading you have the leads on the wrong way, this is not in any way a disaster using a digital meter but can be misleading.