Honda Motorcycles - FireBlades.org - Reply to Topic
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

Thread: ECM Questions? Reply to Thread
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  Topic Review (Newest First)
07-06-2011 12:18 AM
bladeracer
Re: ECM Questions?

Quote:
Originally Posted by 929lad View Post
Bike powered by battery So what about HISS? is that what it does - produces 9v signal?

HISS is additional to the diode.
07-05-2011 8:39 PM
929lad
Re: ECM Questions?

Bike powered by battery So what about HISS? is that what it does - produces 9v signal?
07-05-2011 12:28 AM
mrsexx1
Re: ECM Questions?

Thanks for your quick response and A+ information, that cleared up a few things for me. I recently purchased a alarm with a remote starter so when it arrived there was'nt much in the box so I thought I could handle the job, Long story made short, I crossed one wrong wire (Pink) on the ignition and it started to smoke so I hurryied and unplugged everything quickly.

I tryed to start my bike and I noticed there was no buzz from the fuel pump and the bike would'nt start and the plugs were not getting any fire, I wanted to cry because I tested my relays and they were good, I thought I would have to spend big bucks on a new ECM unit. I worked on it for 2 day's trying find the problem so eventually I stumbled across an article on the web with three new ideas and all three ideas are working and proven solutions to this problem, Here is what worked for me and maybe it can help others....

You wont find this in many places because that is an anti-theft measure. but that pink wire comes from a zener diode in the original ignition. and it sends a 8-9 volts to the ecm. if the value is any higher or lower then the ecm wont function. ive done two things with this before. it sounds crazy but it works without buying a original ignition. from any electronic supplier you can find a 8 or 9 volt regulator. much like a transistor. it has three prongs. one you put on a switched on 12v source and the middle prong you put to a ground and the third you put back to the ecm wire.
thats they way ive done it on a customers bike before where he was short on cash. but if you really want to impress your friends. just find a 9volt battery that goes into remote control rc cars or whatever. ground the negative side and put the positive on that pink wire, and that will make it work as well. you can be creative with switchin or whatever. but best fix is to simply replace the ignition switch with the stock switch.
this should get you some results. just let me know if i can be further help. thank you.

The battery option is cool!!!
07-04-2011 4:46 PM
bladeracer
Re: ECM Questions?

Quote:
Originally Posted by mrsexx1 View Post
Hello,

My question is, On a 01 929rr does the ECM control the fuel and the spark on this machine or does the relays control those systems (explain how this works)? Also how can you findout if the ECM unit is fried or not? When you turn the key which system acts first, The ECM or the fuel pump/cut off relays? Im no electrician so im very puzzled with this. Any info would be great.


It depends on what you mean by "control".
The ECU takes the signal from the cam sensor to determine when to send a timed pulse to the injectors (as the piston starts down the bore) and the crank sensor to send a firing signal to the coils (including changing the advance) just before the piston reaches the top of the bore.
The fuel pump is operated by a relay due to its high current draw but it is turned on and off by the kill switch and is live all the time. There are other "on/off" switches for it though, including the bank angle sensor.
Turning the ignition key on powers up the ECU. If the killswitch is already on (as it should always be) then the fuel pump relay is triggered as well to pressurise the fuel rail.
The only practical way to test an ECU is to swap in a known good one.

What exactly are you trying to sort out?
07-04-2011 3:46 PM
mrsexx1
ECM Questions?

Hello,

My question is, On a 01 929rr does the ECM control the fuel and the spark on this machine or does the relays control those systems (explain how this works)? Also how can you findout if the ECM unit is fried or not? When you turn the key which system acts first, The ECM or the fuel pump/cut off relays? Im no electrician so im very puzzled with this. Any info would be great.

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