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c28 code, not revving past 9k from 3 to 6th gear not passing 120 mph.

1524 Views 18 Replies 4 Participants Last post by  TheGeek, 
Santiprox
my 05 gsxr 600 is having trouble with the STVA, jump wired it threw c28 code. to fix this do i just buy a used working STVA on eBay or try to re weld the little pins on the current STVA??? help!!!! second bike so I'm new into bikes.
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TwistedMister
elaborate, pics? you did what now? reweld the little pins?
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Santiprox
TwistedMister said:
elaborate, pics? you did what now? reweld the little pins?
Click to expand...
i havent done anything right now. im not sure if i should buy the whole STVA piece off ebay or just try to reweld the pins. that's my question. What should i do?

04 05 GSXR 600 / 750 STVA - SECONDARY THROTTLE VALVE ACTUATOR | eBay
ths is the link to the STVA on Ebay
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TwistedMister
got pics?
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Santiprox
TwistedMister said:
got pics?
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of what exactly??
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P
Santiprox said:
i havent done anything right now. im not sure if i should buy the whole STVA piece off ebay or just try to reweld the pins. that's my question. What should i do?

04 05 GSXR 600 / 750 STVA - SECONDARY THROTTLE VALVE ACTUATOR | eBay
ths is the link to the STVA on Ebay
Click to expand...
No one knows your skill level. Only you do.

It's been about 5 years since I repaired mine,so have forgotten most of what's involved.
Taking it apart is easy, putting it back together is fiddly. You will need to drill out the rivets
and repair the soldering inside, then reassemble with small(M3?) screws.

It would be good if you have some previous experience soldering on circuit boards and what
to look out for. For example, loose pads and broken traces.

And don't loosen the Sensor. That's set from the factory.

You will need basic hand tools, soldering iron, battery drill/drills etc and preferably a
copy of the workshop manual.

You should find plenty of info on this site and perhaps even youtube on how to do the repair.
But if you're not feeling confident, then perhaps just buy a replacement or get someone with
more experience to help you.

NB. "Man... those things are expensive".
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Santiprox
peter079 said:
No one knows your skill level. Only you do.

It's been about 5 years since I repaired mine,so have forgotten most of what's involved.
Taking it apart is easy, putting it back together is fiddly. You will need to drill out the rivets
and repair the soldering inside, then reassemble with small(M3?) screws.

It would be good if you have some previous experience soldering on circuit boards and what
to look out for. For example, loose pads and broken traces.

And don't loosen the Sensor. That's set from the factory.

You will need basic hand tools, soldering iron, battery drill/drills etc and preferably a
copy of the workshop manual.

You should find plenty of info on this site and perhaps even youtube on how to do the repair.
But if you're not feeling confident, then perhaps just buy a replacement or get someone with
more experience to help you.

NB. "Man... those things are expensive".
Click to expand...
Thanks for the info, I'm guessing ill just put the whole thing on there ( 04 05 GSXR 600 / 750 STVA - SECONDARY THROTTLE VALVE ACTUATOR | eBay ) and see if the c28 goes away. hopefully it does and the bike performs properly, i don't have any experience on those fields that's why i will go the 300 bucks way XD (whole piece)
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TheGeek
You paid $225 too much.
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Santiprox
TheGeek said:
You paid $225 too much.
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i haven't paid or bought anything yet... what do you suggest? i've checked your profile and seems you are the c28 god. HELP!
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TwistedMister
Santiprox said:
of what exactly??
Click to expand...

broken pins that need to be welded...??? everything you're working on, not a lot we can do sitting here trying to guess exactly WTF is going on here right?
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TwistedMister
is this the unit that's fubared? #15? resoldering pinouts is a risky proposition IMHO, if it's to get you home or whatever do what ya gotta do but for $86 new why roll with jake parts? www.ronayers.com

577608
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TwistedMister
should be a $20 part good used
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TheGeek
15 are the throttle position sensors. The one to the left is the secondary, the one to the right is the primary.

Broken pins that need re-welded? Sounds like you've been watching the youtube videos of people who need their tools taken away. :D
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TwistedMister
I see ebay has an entire TB setup appears to have STVA, 300

apparently it was a trap, they make you buy the entire TB setup to get a new STVA.. ghetto

man I'd go with that ebay TB setup, make sure its good tho, don't wanna buy one with a bad actuator, or buy one of the $250 actuators..

get us a pic lets see what your up against here, maybe it can be repaired or that pinout can be replaced from a bad STVA that has a good pinout?

maybe another way to wire it up proper, need to see both the bad pins and then the coupler
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Santiprox
TwistedMister said:
is this the unit that's fubared? #15? resoldering pinouts is a risky proposition IMHO, if it's to get you home or whatever do what ya gotta do but for $86 new why roll with jake parts? www.ronayers.com

View attachment 577608
Click to expand...
577647

that is the problem, basically my bike sometimes does rev high but when it does these piece shakes and starts doing false contact or that's what I've heard is the problem most of the times. (c28)
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Santiprox
TheGeek said:
15 are the throttle position sensors. The one to the left is the secondary, the one to the right is the primary.

Broken pins that need re-welded? Sounds like you've been watching the youtube videos of people who need their tools taken away. :D
Click to expand...
yes ive seen tutorials how people fix the false contact thing, whatever i think when i get my paycheck i will take it off my bike and buy ur fixing service on ebay. i can't take it off right now, my 05 gsxr 600 is my only vehicle for transportation. i will see if i can get a ride to work so im able to take it off and ship it to you. i saw your website and read about the TPS calibration, when i jumped wired into dealer mode my bike showed _c28 so that means my TPS is set too low? could that be the problem with revs and when i go full throttle it loses power? could that be causing the fi light?
maxresdefault.jpg
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TwistedMister
jeez, and Suzuki just went with it eh? then to stick it on the end of the TB rail so you have to buy a new rail to replace seems suspicious..

not sure I can see exactly what the problem is but as an actuator it's a poor design to say the least, all the electrical components should be suspended in an encapsulating gel, sealed off.. pin connectors should be making any and all contacts..

best guess is those pins sticking out make contact when its assembled and now it's iffy or intermittent?

pretty easy to build those points up if you solder at all and have a decent solder station, Geek will hook it up, man, how scary are the newer gixxers?
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Santiprox
TwistedMister said:
jeez, and Suzuki just went with it eh? then to stick it on the end of the TB rail so you have to buy a new rail to replace seems suspicious..

not sure I can see exactly what the problem is but as an actuator it's a poor design to say the least, all the electrical components should be suspended in an encapsulating gel, sealed off.. pin connectors should be making any and all contacts..

best guess is those pins sticking out make contact when its assembled and now it's iffy or intermittent?

pretty easy to build those points up if you solder at all and have a decent solder station, Geek will hook it up, man, how scary are the newer gixxers?
Click to expand...
yes, i guess im gonna FULL SEND to geeks XD, to get it fixed lol. i'm not a solder and have no solder station XD im 17 and into my second bike with a damaged STVA XD
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TheGeek
With respect to the dash position (_C00). It should NEVER read low. Usually this is because someone improperly adjusted the TPS or they've turned the idle down from the spec. To adjust the TPS, the bike needs to be fully warmed up, and idling at the prescribed speed (1300-1400 rpm on a 600).
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