Hi ,
Wondering if anybody can please help.
I have a CBR900R 2001 fuel injection model.
​It is turning over, but not starting.
The previous garage it went to said that it needed a wiring loom, wiring loom now fitted and still the same issue as previous.
It is recognising the key so its not the ECU.
New battery has been fitted also.
No spark when trying to start.
Any help or advice would be much appreciated.

 

What's the history of this bike? When did it stop working? I ask because we get people asking questions here who forget things like "oh, it was in a crash, and I removed all the failings, and unplugged the bank angle sensor, and switched the motor to a Suzuki..."

 

Hi,

my dad has owned the bike for probably about 5 years, and it has not been working for about 8 months (been sat in the repair shop for about this time) this is the repair shop who said new wiring loom.
Unfortunately my dad passed away a few months ago, and I have inherited his pride and joy.
The bike hasnt been in an accident etc, it just started with this issue and if i remember rightly it was after my dad had an alarm/immobilser put on (I cant remember the full details) and I don't know if this was removed from the bike or not.
The bike went into the repair shop, they said it sounds like it needs a new wiring loom.
I collected the bike from the repair shop as they just kept fobbing me off, they hadn't even fitted the loom at all.
Taken it to a different repair shop, the loom is now on and still same problem.
It meant the absolute world to my dad this bike and to get it started would mean the world to me.
Thanks

 

Well, let's wait for @dannoxyz our resident electrical expert. I am sure he'll guide you towards some diagnostic process. I would make sure everything is plugged in - especially the bank angle sensor...

and - dude! so so sorry about your Father! that makes your story about the ****ty repair shop even more heartbreaking.

By new loom - you mean new OEM loom, or used one? I ask because usually it's easy to undo an immobilizer, and a new loom adds a new set of potential problems...

 

Thank you, it was his absolute pride and joy, he thought it was in good hands at this first repair shop, and when I went to collect it, it was like a motorbike graveyard it was in the corner with all other bits of people's bikes on top of it, I took it away immediately.

The 1st repair shop purchased a 2nd hand loom, the pic below is the one that has come off my dads bike.

 

Hi and welcome! Sorry to hear about your father. Some questions:

1. what indicators did 1st shoppe use to show that loom replacement was needed? This is fraught with dangers as unless you buy brand-new factory OEM harness from authorised Honda dealer, any other loom you get will be used and may have exact same faults as yours or worse. Even with proper new Honda OEM loom, swapping them can introduce additional errors and damage into system.

2. what indicators show that ECU recognises key? Wrong key will still crank engine, but will result in no sparks. Which is problem you have now anyway.

Wiring diagram. Note EU models come with immobiliser built-in, so not sure what your dad was attempting.



I have not been able to get any kind of reliable service from garages in over 30-yrs. You have to recognise that to get bike running, YOU must be one to fix it. Are you willing to learn what it takes to do effective repair?

First learn how to use multimetre. This is 5-minute repair with metre, often less...

https://learn.sparkfun.com/tutorials...multimeter/all

 

My condolences about your father. That is very unfortunate.
i will say that usually anytime you replace an entire wiring loom it's either one of three reasons: 1. Something catastrophic has happened and it takes more effort to repair the loom than it does to replace it. 2. A previous owner really hacked things up to the point there is no discerning which way is up, or 3. You have no idea what is wrong and are just slinging something against the wall, hoping something will stick.

 

Definitely #3, those garages can't even figure out how to fix kitchen light bulb.


First test measurement we're going to do is BAS/lean-angle sensor and engine-stop relay. This powers entire EFI system, and without power, bike will crank, but ECU, fuel-pump, all sensors, injectors, sparks will be dead:


1. at engine-stop relay, measure resistance between red/org wire to chassis-ground, ohms = ??? . This is activation-ground for relay from BAS, most important wire on entire bike!

2. key ON, start/stop=RUN, measure voltage at blk wire at engine-stop relay, volts = ???. This is activation power from start/stop switch

3. measure voltage at red/wht wire at engine-stop relay, volts = ???, input power from 20a FI fuse

4. measure voltage at blk/wht wire at engine-stop relay, volts = ???, output power to entire EFI system

 

Hi,

Many thanks for your quick detailed response.

1. I dont think the first shop had a clue and did some guesswork and came up with the OEM loom, not a very reliable place (only just found out) This was definitely a 2nd hand OEM from ebay apparently.
2. It's factory fitted HISS and on my dads keys there is a fob for Datatool and an auto electricians business card fob, ive rang the auto electrician and he doesn't remember the bike and wasn't any help at all.
When the key is in the bike the light comes on and goes off as if to shoe its accepted the key (please correct me if I am wrong on this).
I honestly wish I could remember what my dad had said to me about the bike problem.

I will definitely have a look at the multimeter.

Thank you

 

btw - a "DataTool" is a third party immobilizer - it might have been required by his insurance company. Replacing the loom should have removed it completely but this is what it looks like. The other thought is DataTool also make a GPS tracker - it's a subscription service so you might have noticed it in your fathers financials.

Either way, installing a new loom should have deleted it.

https://www.datatool.co.uk/product/d...m-immobiliser/