Fuel Injection Light - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 16 (permalink) Old 08-01-2012, 02:46 PM Thread Starter
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Fuel Injection Light

I was racing with a group of friends at a lake. And I was racing my bike pretty hard, and at the end of our group ride my rc decided to do a backfire popping sound from the pipes. While doing that, my FI light would stay on solid for 3-6 seconds and turn my bike off.

This happened every time. My Rc stays on in neutral, but the problem seems to be it shuts off when i put it in gear (doing so would turn FI light on and shut the bike off instantly). I even had it in gear before i would start it, which allowed me to take off but only for 10 yard until my FI light would come on and shut my bike off.

Why??((
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post #2 of 16 (permalink) Old 08-01-2012, 05:17 PM
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Does it have a PCIII on it? disconnect and check running condition after.



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post #3 of 16 (permalink) Old 08-01-2012, 06:15 PM Thread Starter
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Does it have a PCIII on it? disconnect and check running condition after.
Do you have a picture of this PCIII ?
She starts up without hesitation and idles just fine.
So it must be something easy i assume, its just taking off is the problem.
She'll start to sputter and then shut off.

She was riding like a beast yesterday, but i did ride fast through some really hard bumps. maybe it could have disconnected something?
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post #4 of 16 (permalink) Old 08-01-2012, 07:44 PM
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I'd check your:
1) Battery posts connections to ensure they're nice and snug.
2) Sidestand switch to ensure it's working properly
3) Clutch switch to ensire it's working properly.

Since the bike seems to die when you place it in gear, it may be the clutch or sidestand switches might be faulty.
Along with the neutral switch, they make up the safety interlock system.

The engine dying while riding could be loose battery posts causing a brief loss of power to the ECU, which then resets.
Did you notice if your tachometer did a sweep cycle, as it does when you initially switch the key on?
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post #5 of 16 (permalink) Old 08-02-2012, 02:30 AM Thread Starter
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I'd check your:
1) Battery posts connections to ensure they're nice and snug.
2) Sidestand switch to ensure it's working properly
3) Clutch switch to ensire it's working properly.

Since the bike seems to die when you place it in gear, it may be the clutch or sidestand switches might be faulty.
Along with the neutral switch, they make up the safety interlock system.

The engine dying while riding could be loose battery posts causing a brief loss of power to the ECU, which then resets.
Did you notice if your tachometer did a sweep cycle, as it does when you initially switch the key on?
The battery, sidestand switch and clutch switch are fine.
I double checked to see if they were fine, disconnected and reconnected things to make sure everything was ok.

It sometimes shuts off when I put it in gear, but not all the time.

I havent done anything to the ECU yet, not even sure what it actually looks like either. Yes my tachometer did a sweep cycle like normal when I turn the key. My bike stars up fine in neutral and will stay on. Taking off the issue
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post #6 of 16 (permalink) Old 08-02-2012, 03:46 AM
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PCIII is the power commander, I'm guessing you probably don't have one on there if you don't know what it is.
When the bike shuts down does the odometer reset too? Look into the service manual under the TS section and look up the symptoms your bike has. It will help a lot with looking over where everything is routed thru.


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post #7 of 16 (permalink) Old 08-02-2012, 01:40 PM Thread Starter
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PCIII is the power commander, I'm guessing you probably don't have one on there if you don't know what it is.
When the bike shuts down does the odometer reset too? Look into the service manual under the TS section and look up the symptoms your bike has. It will help a lot with looking over where everything is routed thru.


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Yeah I dont have a power commander.
When my bike shuts down, the odometer does reset, and my fuel tank/injection
will prime like you do when you first turn the bike on.

I cant seem to find an rc51 service manual online. any direct links i can go to?
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post #8 of 16 (permalink) Old 08-02-2012, 02:00 PM
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I cant seem to find an rc51 service manual online. any direct links i can go to?
http://www.carlsalter.com/download.asp?p=963


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post #9 of 16 (permalink) Old 08-02-2012, 05:03 PM
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1) You could have problems with the engine kill switch on the right bar.
2) You could have wiring problems.

You stated that when the engine problem occurs, the ECU initializes and fuel pump primes as if the ignition was switched off and then on.

I'd also check the wiring harness on the left side, under the fuel tank.
Where the harness passes over the rear frame section, it's very near the bottom seam of the fuel tank.

It's very easy to pinch wiring at that area, causing momentary opens, which it seams you're having.
Not an easy thing to troubleshoot. But it's happened in the past.

I know when I was working on mine back in '08 I noticed this, and took quite a bit of time to try and route and secure the harness to prevent this.
Even now, if I raise that tank, I SLOWLY lower it and visually check all's clear.

Last edited by SubSailor; 08-03-2012 at 12:27 PM.
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post #10 of 16 (permalink) Old 08-02-2012, 09:38 PM Thread Starter
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Originally Posted by SubSailor View Post
1) You could have problems with the engine kill switch on the right bar.
2) You could have wiring problems.

You stated that when the engine problem occurs, the ECU initializes and fuel pump primes as if the ignition was switched off and then on.

I'd also check the wiring harness on the left side, under the fuel tank.
Where the harness passes over the rear frame section, it's very near the bottom seam of the fuel tank.

It's very easy to punch wiring at that area, causing momentary opens, which it seams you're having.
Not an easy thing to troubleshoot. But it's happened in the past.

I know when I was working on mine back in '08 I noticed this, and took quite a bit of time to try and route and secure the harness to prevent this.
Even now, if I raise that tank, I SLOWLY lower it and visually check all's clear.
okay, so i disconnected the ECU box i believe, disconnected and reconnected. Took the bike for a quick spin and had no problems. going to to a bit further and we'll see how it goes I guess.

?

Last edited by Ram51; 08-02-2012 at 10:14 PM.
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