Code 28 What wire do I cut? - Suzuki GSX-R Motorcycle Forums Gixxer.com

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post #1 of 14 (permalink) Old 03-24-2015, 08:30 AM Thread Starter
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Code 28 What wire do I cut?

my STVA has craped out on me, and i am going to just remove it. But was wondering what wire to cut to get rid of the FI light? or if there is a resistor i can use?
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post #2 of 14 (permalink) Old 03-24-2015, 10:24 AM
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Re: Code 28 What wire do I cut?

No wire to cut on the STVA. What year is your bike and how many miles?
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post #3 of 14 (permalink) Old 03-24-2015, 12:59 PM
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Re: Code 28 What wire do I cut?

TheGeek used to repair the actuators. If you remove it, you need an emulator to prevent the C28 error. Possibly there's some way to turn it off by flashing the ECM but, if so, I'm not familiar with it.
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post #4 of 14 (permalink) Old 03-25-2015, 03:08 PM
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Re: Code 28 What wire do I cut?

ECU Unleashed flashing can't take care of the C28 code. No emulators exist for the newer digital stepper type STVAs (used since 2003).

They are an emissions component covered under EPA warranty for 5 years / 30000km. So if you're bike is under 18600 miles, you can get it fixed for free at the dealership.
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post #5 of 14 (permalink) Old 03-26-2015, 08:18 AM
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Re: Code 28 What wire do I cut?

My ecu had that feature disabled at the time all the other nannies and crap were turned off. It required a $8 harness cable that attached to the bikes existing two interface plugs. Ecu software and Main interface cable were the tuners. He simply disabled the items and I removed all hardware from the bike.

Not a easy quick fix but it can all be disabled in the ecu once you have the means to access it.
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post #6 of 14 (permalink) Old 03-26-2015, 11:17 AM
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Re: Code 28 What wire do I cut?

What company/software/hardware was used?
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post #7 of 14 (permalink) Old 03-26-2015, 01:58 PM
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Re: Code 28 What wire do I cut?

Quote:
Originally Posted by TheGeek View Post
What company/software/hardware was used?
I bought the $8 cable here http://www.boostbysmith.com/index.html and Livengood Motorsports http://livengoodmotorsports.com dyno tuned the bike and cleaned up the ecu.
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post #8 of 14 (permalink) Old 03-26-2015, 02:41 PM
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Re: Code 28 What wire do I cut?

Are you sure they removed the SDTV system? Woolrich Racing makes no such claim....
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post #9 of 14 (permalink) Old 03-26-2015, 04:44 PM
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Re: Code 28 What wire do I cut?

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Originally Posted by TheGeek View Post
Are you sure they removed the SDTV system? Woolrich Racing makes no such claim....
My mistake I was confused thought we were talking of the other dreaded Suzuki curse that SET crap. My SDTV is still intact.

Everything else though is gone.
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post #10 of 14 (permalink) Old 03-26-2015, 10:44 PM
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Re: Code 28 What wire do I cut?

These quys do it by bypassing the C28/C29 codes.
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post #11 of 14 (permalink) Old 03-30-2015, 02:13 PM
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Re: Code 28 What wire do I cut?

Yoshimura site has the diagram for the pin/wire to pull from the ecu under the seat. This keeps the code from setting an fi light when you remove all the components. I deleted everything from my 09 using this method with no issues. It's free and takes less than 20 minutes.
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post #12 of 14 (permalink) Old 03-30-2015, 03:24 PM
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Re: Code 28 What wire do I cut?

^You're making the same mistake that roy826ex did. We're talking about the secondary throttle, not the SET valve.
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post #13 of 14 (permalink) Old 04-01-2015, 02:05 AM
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Re: Code 28 What wire do I cut?

Ahhh my fault for not catching that. This is the first I've read for deleting or disabling secondary throttle. What are the symptoms of this going bad or advantages to disabling?
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post #14 of 14 (permalink) Old 04-01-2015, 07:06 AM
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Re: Code 28 What wire do I cut?

Top end restriction and fault indication are the symptoms of failure.

Advantages of disabling are debatable. They're there to control/maintain/stabilize intake velocity. This technology started with CV carbs and has carried through to fuel injection. Unless you're smarter than the engineers at Suzuki/Yamaha/Kawasaki, you should probably just leave it alone.
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