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CBR 900RR 1993 - 1999 Honda CBR 900RR

Cbr900rrw (UK) - No Spark

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  #1  
Old 05-16-2018, 10:31 AM
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Default Cbr900rrw (UK) - No Spark

Hi all,

New to the group! I've have a confession to make, I kinda caused this problem Rtfm my dad used to say (he'll be looking down on me shaking his dead no doubt!).....

So, my cbr900rrw is a UK 1998 model. Its been sat for two years for to personal reasons and I'm working on getting it up and running again. Compete service! I cut the pink wire on the ignition side of the harness without realizing it would cause issues, I was looking for a 12v feed only with the ignition on amd that was one. Now my problem is that I do not get any spark whatsoever.....

A few days before this, the bike was fine on my bench. I crimped a new the connector to the wire I had cut splicing another wire into it. After realising this killed me spark. I removed everything but cutttikng above the splice (one the ignition switch harness side) and crimping a new connector in. I poked this back into the black block but she still isn't firing!
I've tested the harness side and get 12v to the coil but nothing out of them on the ht lead side.
As it worked a few days ago is unlikely both coils hadlve packed up, it feels life I've blown something but i just don't knits what.... Everything else works as it should, main lights, horn, all the instrument cluster lights (speedo/rev counter , oil light & mileage count). I've checked all fuses (that I know of) and couldn't find any of them broken.

I've not touched anything else on the bike, ignition pickup sensor etc so i cant see why that wpuld suddently fail.

I read online in this forum that the pink wire serves 9v to the ecu (icm or ecm) and that's from the diode within the ignition switch itself. I have 0 volts on the pink wire where ot meets the ignition plug. Weirdly I have 3.81v continually on the pink wire where it comes into a black 3 pin block from the gearbox (green & black & pink block) this block is to the right of the carbs.... This is the only place where the pink has voltage.
I have checked the ignition dope an b that is connected and had 12v on one side but not the other. Is that the cause or an I missing something?

I'm totally stumped guy/gals. Please help me.

Cheers,
Stu
 
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  #2  
Old 05-16-2018, 11:31 AM
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Hi , with ignition on what voltage do you get from the pink wire coming out of the ignition switch, I think the other block you are talking about is the Speed Sensor
 
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Old 05-16-2018, 11:46 AM
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Hiya.
Many thanks for your help/time!
I do not get any voltd coming out of. Bottom left wire is from the ignition switch. Zero volts at this point.
The pink pin attached to the loom side has 3.81v when the ignition on or off. The female part of this goes to the next photo which i believe is the gearbox sensor next to the starter motor?
Starter motor switch?
 
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Old 05-16-2018, 12:13 PM
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The pink wire from the ignition switch should go straight to the ecu, trace the wire from the ignition to the ECU, or start from the ECU back to the ignition switch
 
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Old 05-16-2018, 12:20 PM
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Hi,

I seen that in the wiring diagram but it just confused me when i spotted it spuring off to the sensor above the gearbox, as its not mentioned thatin the wiring diagram??

Id rather not have to pull the harness apart buy sounds like I might have to 😣
 
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  #6  
Old 05-16-2018, 12:24 PM
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Something has gone wrong somewhere because there was 12v on that pink wire before the cut was made and now there isn't.
I can only assume its between the ignition bkock connector and where that other block is in the pics above?

Ive checked the harness else where and can see it coming out other than that... I don't think that 3.81v is right at that section too.....

Im so confused by it all
 
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Old 05-16-2018, 12:35 PM
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Is this zennor diode working correctly too? What Im thinking it's that it should have power on both sides? With the ignition on the white has 12v, the blue, none.
diodes pass in one direction right, so id there none from this side it may have blown, which is why i have power to all other wires out of the ignition?
 
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Old 05-16-2018, 12:45 PM
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One way to test is , get one of those small household 9v batteries join the positive side to the pink on the harness and the negative to a good earth, ignition on and see if it starts
 
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Old 05-17-2018, 01:13 AM
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I tested that and it still didn't give a spark.
ill run the test again buy picking up a 9v battery clip connector to be sure im getting a proper connection from positive and framed earth from the battery.

If that fails when. I guess I'm looking stu a new ecu?
The bike is an import. Its been in my family since new, the speedo is in KPM. Does this make any difference to the pink wire or ecu (when i come to buy another sheet the 9v test)?

Yesterday wasn't a good day, I was stolen from when at the gym 250 worth of stiff nicked! I'v pulled something in my lower back & was poo'd on by a seagul!

Thanks for your help!
 
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  #10  
Old 05-17-2018, 02:57 AM
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Hi matey sorry to hear your troubles, but dont buy anything else just yet , at least not until you've exhausted every other cause first, the bike was running OK until you cut that pink wire , so thats where the problem lies, discount the pink wire you have seen at the speed sensor, that changes colour at the connector to pink/green, another way you can connect this is to pull out the pink wire from the ECU and plug this 9v battery straight into the ECU to test only, that will take out the whole of that pink wire to the ECU
 
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