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Discussion Starter #1
G'day all,

Set off for work this morning and she stopped dead 200m down the road at the first corner. I had just fitted a Brembo RCS master cylinder and rigged up a micro switch for the brake that I got from Jaycar (local electronics shop) the day before. Brake light worked fine in testing but I hadn't started the bike (just ignition on).

It seemed to happen as I braked for the corner. Lost power and cut out. All dash lights o.k., tacho needle sweeps etc. but wont crank.

Did notice that the brake light was constantly on (with ignition) from then even when I pulled the wires from the micro switch. Had to get the car for work so haven't had time to investigate yet.

Bikes a 2009 1078RR Brutale. Tried a few searhes but not much comes up with the words I'm trying.

Cheers

Deano
 

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G'day all,

Set off for work this morning and she stopped dead 200m down the road at the first corner. I had just fitted a Brembo RCS master cylinder and rigged up a micro switch for the brake that I got from Jaycar (local electronics shop) the day before. Brake light worked fine in testing but I hadn't started the bike (just ignition on).

It seemed to happen as I braked for the corner. Lost power and cut out. All dash lights o.k., tacho needle sweeps etc. but wont crank.

Did notice that the brake light was constantly on (with ignition) from then even when I pulled the wires from the micro switch. Had to get the car for work so haven't had time to investigate yet.

Bikes a 2009 1078RR Brutale. Tried a few searhes but not much comes up with the words I'm trying.

Cheers

Deano
undo the mods you have recently done and see if she runs,
 

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Discussion Starter #4
Hi Deano, sorry mate , but what where actually trying to do , with your mod, cheers eddy
Eddy,

It wasn't a mod. I just fitted a Brembo front brake master cylinder. It didn't come with a micro switch for the front brake light. The standard one wouldn't suit so I bought one from a local electronics store and modified it to suit. Worked fine in testing with ignition on but not running.

Have just finished an initial investigation:-

Reconnected the standard micro switch and the brake light remains on regardless of whether button is pushed or not with ignition on.

Fuel pump does not prime when ignition is switched on and bike wont crank when starter is pushed. Everything else seems as normal ie. dash lights, tacho sweep, indicators, horn etc.

Checked all fuses and they appear o.k. Will continuity check them later.

I run a Microtech from Chris and when I connected to the computer to check a map was still loaded I went to the monitor screen. From here you can start the bike remotely and prime the pump. The bike cranks from here and the pump primes but wont start.???????????

I'm thinking spu????????????????? Any help appreciated.

Cheers

Deano
 

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Deano check for loose fuel line .or crimped fuel line ,this has happened to me,check for bubbles in the fuel tank when cranking some type of hose comes off in there.grab a torch and have a look.no matches please.
 

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Discussion Starter #9
Deano check for loose fuel line .or crimped fuel line ,this has happened to me,check for bubbles in the fuel tank when cranking some type of hose comes off in there.grab a torch and have a look.no matches please.
Eddy,

Yeah, had that one a while ago. Had them nearly all now - hub, fuel hoses, headlight etc. If it turns out to be the spu I'll have the complete set! Fuel pump doesn't prime except via the Microtune program.

I'll chase down a short in the brake light system. Something wrong there and according to the wiring diagram it runs through the spu. Why this stops cranking and the fuel pump who knows? Green steam is definitely not my forte and I'm flying blind here except for the simple basics!

Cheers

Deano
 

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Also check your kill switch circuit, just in case you have disturbed it at the connections.
Fwiw I have the Std ecu, but on mine fuel pump primes, dash works etc but it will not turn over if the kill button is in.
 

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Discussion Starter #12
Also check your kill switch circuit, just in case you have disturbed it at the connections.
Fwiw I have the Std ecu, but on mine fuel pump primes, dash works etc but it will not turn over if the kill button is in.
Revhead,

I'll check that when I get home today. I'll try and get the brakelight to go out first. Spoke to Chris re the ecu and he said that was a thing to try later - reinstall the standard unit, which i still have.

Going to be a slow process of elimination. Looks kike the back of the spu comes off easily enough. Anything in there repairable does anyone know? Cant smell anything has burnt or shorted.

Cheers

Deano
 

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easy to pull out ,take the tank off ,then pull the 2 bottom connectors out,it just sits in a rubber pocket.very easy to get out.good luck
 

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Discussion Starter #14
easy to pull out ,take the tank off ,then pull the 2 bottom connectors out,it just sits in a rubber pocket.very easy to get out.good luck
Pulled the spu out. Pulling the plugs off the unit is the only thing that kills the brake light with the ignition on because that takes all power out of all the systems. No power to either wire going to the front stop micro switch. Can't see any points on the wiring where anything has rubbed to cause a short to the brake light. Disconnected the rear light but no change to cranking etc.

Methinks it's shorted out inside the spu. What's the point of all the bloody fuses if they stay intact and the unit fries? Can anybody electricaly inclined explain?

Cheers

Deano
 

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Dear Deano,
I am not sure in your case what will be the problems, but I had a problem with my Fan not turning on and checked all wiring and even changed the sensor and fuses as well, but nothing happened. Al last has changed a new SPU which it cost me around $495 and all working fine now.



The reason I comment that, the SPU on my bike were the newer model and according to many comments, it should not have any problems with SPU. Unfortunately it does have a problem in my case.
What I could suggest, if you know someone who has a Brutale SPU to lend you to try and see if your problems can be rectify? If it does then you have to get a new one, but if the problem still exists, then there must be other problems.
Cheers,
 

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Dear Deano,
I am not sure in your case what will be the problems, but I had a problem with my Fan not turning on and checked all wiring and even changed the sensor and fuses as well, but nothing happened. Al last has changed a new SPU which it cost me around $495 and all working fine now. The reason I comment that, the SPU on my bike were the newer model and according to many comments, it should not have any problems with SPU. Unfortunately it does have a problem in my case.

What I could suggest, if you know someone who has a Brutale SPU to lend you to try and see if your problems can be rectify? If it does then you have to get a new one, but if the problem still exists, then there must be other problems.

Cheers,
 

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Discussion Starter #17
Well gentlemen,

I feel like a right plonker now. Sweated blood pulling the bike apart and testing every switch, plug etc. and inspecting the wiring for breaks/shorts.

Went back and tested the fuses for continuity and discovered the stop fuse was blown (not apparent visually). Replaced it and everythings good again!

Glad I've found it but confused as hell considering the symptoms. Why would a blown fuse for the stoplight, stop the bike dead yet still keep the brake light on? Defies all logic and makes tracking problems a nightmare. Was close to giving up and ordering a new spu.

Thank for all your replies fellas, can never have too much help.

Cheers

Deano
 

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well done Deano,thats why i use a microscope to check the fuses,or just replace one by one ,good job mate.ps: my eyesight is pretty bad these days Lol

cheers eddy
 
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