jgr
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| posted on 1/12/10 at 11:12 PM |
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So I have these three wires
As title,
Engine runs...not sure on witch map?,but I've got three wires left over (shame not to use them)
1 blue gear pos/ecu.... must be for light on dash?
2 yellow/blue. ecu...tacho...?
3 black/brown. ecu....?????
Any help
Regards JG
Busa engine I forgot to say
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norfolkluego
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| posted on 2/12/10 at 12:46 AM |
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Cut the blue one, cut the blue one
Bang
Sorry
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Daddylonglegs
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| posted on 2/12/10 at 04:26 AM |
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quote:
Originally posted by norfolkluego
Cut the blue one, cut the blue one
Bang
Sorry
PMSL 
It looks like the Midget is winning at the moment......
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cosmick
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| posted on 2/12/10 at 09:21 AM |
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Hi jgr
You will need to let us know what year Hayabusa as the wiring harnesses did change.
Black/Brown is usually a 5 volt earth to the ecu so sometimes can be important, however there is a wire to disconnect the o2 sensor which may be your
wire that you refer to.
Please let us know the year.
If it can't be fixed with a hammer then its probably an electrical problem.
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jgr
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| posted on 2/12/10 at 08:06 PM |
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Hi
The blue I have is 'T' into the gear pos wire that goes to the ecu, I checked with meter and is earth only when it's not in gear.
Yellow/blue shows a pulse to earth when the engine is running, only found this out with power probe...hence tacho?
Black/brown shown on diagram from ecu to multiplug for the dash (I'm not sure what it does) 4.7v to earth?.
I'm not using std clocks, and have stripped the wiring out to just engine loom.
The engine I think is an 06, wiring could be from an older bike.
Regards JG
Norfolkluego I forgot to add it's a busa not a uxb....... but still funny
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cosmick
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| posted on 2/12/10 at 09:39 PM |
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Hi jgr
The blue wire is indeed neutral and it will illuminate a neutral light on the dashboard if connected. It will also tell the ecu when you are in
neutral hence the reason why it goes back to the ecu. This has a 10500 rev limit in neutral. This Blue wire would normally go to the side stand relay
and change colour to a Blue/White before going to the dashboard.
The Yellow/Blue wire is indeed to drive the tachometer.
The Black/Brown wire you describe is probably to isolate the o2 sensor (lambda). This is to be able to run an exhaust without an o2 sensor connected
and NOT bring on the FI light.
Do you have an o2 sensor on your car?
There is more than one Black/Brown wire running to the ecu. The other Black/Brown wires must remain connected as it is the common earth return for all
the 5 volt sensors.
The o2 sensor is the only one that can be disconnected. Disconnecting the wrong Black/Brown will result in all the other sensors giving no information
to the ecu and the engine will not run or will run badly with an FI light on.
So, if the engine is running and (if you are using the standard Hayabusa clocks,) you have no FI light, then the correct Black/Brown wire has been
disconnected.
cosmick
If it can't be fixed with a hammer then its probably an electrical problem.
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jgr
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| posted on 2/12/10 at 10:07 PM |
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Hi Cosmick
Thanks for that.
Is it possable to do a diy TRE ....as the voltage change is stepped in 0.3 ...ish voltsper gear, and i know the v drop for 5th
or is it as i think it maybe more involved ?
Also I have no 02, I will run my own wide band.
Regards JG
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cosmick
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| posted on 2/12/10 at 10:19 PM |
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If you are not interested in seeing which gear you are in, then you can fix 5th gear using a suitable resistor equivalent to 5th. That is what a TRE
does. There is however a more inteligent TRE made by Heal Tech called GL Pro. This will give gear position and at the same time work as a TRE.
Personally, I do not use them as I have not seen the benefit.
If it can't be fixed with a hammer then its probably an electrical problem.
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noc231073
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| posted on 3/12/10 at 06:17 PM |
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Do you have to run the o2 sensor for the engine to run correctly Can I just disconnect it
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cosmick
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| posted on 6/12/10 at 05:26 PM |
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Yes you can disconnect it but it has to be from the ecu not the connector at the o2 sensor. It is a Black Brown wire at the ecu that has to be
disconnected. if you just disconnect the 4 pin plug at the wiring harness connector, it will bring an FI light on.
The engine will run without the o2 sensor connected.
If it can't be fixed with a hammer then its probably an electrical problem.
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