954 project - No Spark (FIXED) - Honda Motorcycles - FireBlades.org
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post #1 of 28 Old 06-29-2019, 8:22 PM Thread Starter
 
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954 project - No Spark (FIXED)

Hey everyone. Iíve been working on my 954 project all day trying to get spark. But Iíve been unsuccessful.

A little backstory: (feel free to skip this paragraph). I picked up this 954 from a friend for $500. It was mostly disassembled but i bought it anyway as Iíve been looking for a fun project. Anyway. It was crashed and had an issue where it was turning off randomly while riding. Eventually it wouldnít start at all (so Iíve been told. Not sure i believe). Anyway. It went around to different bike ďshopsĒ (glorified backyard mechanics) and they couldnít figure it out.

Anyway Iíve been working on it and got the bike to crank but Iím getting no spark at any of the plug wires. I tried jumping the diagnosis plug but no info came back. I tested the kickstand switch, and killswitch and i even bypassed the killswitch to make sure. But to no avail. All fuses are in tact and the batter is fully charged and even a jumper was used.

I was reading online that the black and white wire that connects to the ECU should have continuity with the chassis ground. But mine doesnít. Iím not sure if thatís a true thing or not but i did notice that it doesnít.

Other than that i have no clue what to do now. Or what to test next. The stator wire has continuity with all 3 prongs. I havenít tested the RR yet.

Any advice will be greatly appreciated. Thank you all so much!!
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Last edited by HEROrr; 07-14-2019 at 7:27 PM.
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post #2 of 28 Old 06-30-2019, 11:18 AM Thread Starter
 
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Update. I tried testing continuity between the pink wire connection to the ECU and the ignition switch plug. And i wasn’t getting anything! Could this be the source of my problem?
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post #3 of 28 Old 06-30-2019, 11:41 AM Thread Starter
 
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Never mind. I do have continuity between the pink wire. I just tested it again.

Anyway I disconnected the cam pulse generator and put a test light on it. I then cranked the bike and got no light. Not sure what this means but figured it might be worth mentioning
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post #4 of 28 Old 06-30-2019, 11:47 AM Thread Starter
 
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I tried doing my test light off of the 4 pin plug off the black ECU connector (with the yellow/white, blue/red, pink/blue, blue/black) and i cranked the bike a few times and got no light on any connector.

This means that the ECU isn’t sending out a signal to the plugs which is why I’m not getting spark. Not sure where to go from here but at least I’m narrowing it down.
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post #5 of 28 Old 06-30-2019, 2:31 PM
 
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Re: 954 project - No Spark

Had the same problem but my Issue was the ECM .
check you tip sensor make sure its plugged in or bypassed the right way , make sure your getting 9v from your Ignition pink/white with the key in the on position, & check all your ground wires , & the battery is reading 12.6 V , hope that helps
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post #6 of 28 Old 06-30-2019, 5:27 PM Thread Starter
 
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Re: 954 project - No Spark

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Originally Posted by Nouf919 View Post
Had the same problem but my Issue was the ECM .
check you tip sensor make sure its plugged in or bypassed the right way , make sure your getting 9v from your Ignition pink/white with the key in the on position, & check all your ground wires , & the battery is reading 12.6 V , hope that helps
Thank you for your response!

My pink wire is reading 11v and my battery is giving me 12 flat.

The TIP sensor is plugged in, but I also tried by passing it to no avail.

I'm beginning to suspect the ECM but i'm worried about spending the money only to have no change... is there any way I can test the ECM before dropping $150 on one?
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post #7 of 28 Old 06-30-2019, 6:39 PM
 
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Re: 954 project - No Spark

If your getting 11V from the Ignition wire back to the ECM , then maybe you have a bad ignition , if you turn the key on position & read p/w wire you should have 9v . not 11v there is a small resistor inside the key Ignition it bring down the voltage to 9v to the ECM , ( anti theft ) , try that before anything... oh 12V flat would not turn the startear fast enuff to create sprK . under 12.56V batter will have hard time starting a 954 .
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post #8 of 28 Old 06-30-2019, 7:01 PM Thread Starter
 
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Re: 954 project - No Spark

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Originally Posted by Nouf919 View Post
If your getting 11V from the Ignition wire back to the ECM , then maybe you have a bad ignition , if you turn the key on position & read p/w wire you should have 9v . not 11v there is a small resistor inside the key Ignition it bring down the voltage to 9v to the ECM , ( anti theft ) , try that before anything... oh 12V flat would not turn the startear fast enuff to create sprK . under 12.56V batter will have hard time starting a 954 .
Thanks!

Little update:

I charged up the battery to 12.6 and tried again, no change.

I then realized I tested the wrong wire (pink not pink/white) so I tested the Pink/white and got 12.11 Volts!

Just to make sure I am testing this correctly... (I'm really bad with electrical please forgive me!) The way I tested it was I set my voltmeter to 20v and I unplugged the one plug on the ECU and probed the pink/white wire with the red and I put the black on the battery ground cable and the voltmeter read to me 12.11v

Just double checking I am doing this right... it sounds like we may have figured it out though!!! It could be the security system... now I just need to figure out how to dis-arm it?

I cannot thank you enough, I feel like we are getting close to some answers!
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post #9 of 28 Old 06-30-2019, 8:35 PM
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Re: 954 project - No Spark

Anything more on the pink wire out of the ECU with the key switch on will send a "no spark" signal. If you have 12v on the pink wire at the ECU then your Zener diode in the base of the ignition is bad or missing.

Do you have the original ignition switch on the bike?

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post #10 of 28 Old 06-30-2019, 11:11 PM Thread Starter
 
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Re: 954 project - No Spark

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Anything more on the pink wire out of the ECU with the key switch on will send a "no spark" signal. If you have 12v on the pink wire at the ECU then your Zener diode in the base of the ignition is bad or missing.

Do you have the original ignition switch on the bike?
I don't believe so, the previous shop that worked on it I believe put on a different ignition, in fact I know they did because it's a different key that works for my gas tank.

I have the original ignition in a box full of parts they gave me, but the wires have been cut.
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post #11 of 28 Old 07-01-2019, 10:44 AM
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Re: 954 project - No Spark

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Originally Posted by HEROrr View Post
I don't believe so, the previous shop that worked on it I believe put on a different ignition, in fact I know they did because it's a different key that works for my gas tank.

I have the original ignition in a box full of parts they gave me, but the wires have been cut.
Sorry, the start of that post should say ďanything more than 10vdc on the pink wireĒ

And if the pink isnít hooked up (pink/white) for yours, it will send a NO SPARK signal to the ECU. Youíll want to see around 9v on that wire at the ECU.

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post #12 of 28 Old 07-01-2019, 11:55 AM
 
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Re: 954 project - No Spark

Good chance they didn't wire in a resistor to drop the voltage? Should be quite a few posts on the forums on how to wire in a resister of the correct rating to match the resistance of the diode in the key?

The easiest way to figure out the resistance with the original key... can measure the resistance from that key usually.

Companies do sell kits on the internet too that might work ..... what you are looking for is the "Zener Diode".

The other posters are correct about the pink should be getting a different voltage at pink wire.

Last edited by scottscar54; 07-01-2019 at 12:14 PM.
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post #13 of 28 Old 07-01-2019, 6:53 PM Thread Starter
 
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Thanks everyone. I do want to say i do not have a HISS system on my bike (US model) would that matter? I’m doing research on the diode now.
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post #14 of 28 Old 07-01-2019, 7:01 PM
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Re: 954 project - No Spark

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Originally Posted by HEROrr View Post
Thanks everyone. I do want to say i do not have a HISS system on my bike (US model) would that matter? Iím doing research on the diode now.
US bikes still had the pink wire/diode set up. HISS is another bullsh!t story entirely

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post #15 of 28 Old 07-03-2019, 12:18 PM Thread Starter
 
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Update!

So i tried the 9V battery trick but still no luck. After that i decided to just plug the original ignition back in and something happened.

First of all I’m getting like 8.7V to the pink wire (instead of like 11V i was before). Next when i switches the key the fuel pump started priming! Or at least something was making noises down by the injectors. Not sure what it was. But i think it has something to do with fuel.

Anyway still no spark but i feel like this change is huge and maybe we are getting closer to getting spark! Any more advice or things to check? 🙂
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