A very good friend of mine has a K3 which is showing Error C28 and a high tickover - bike has been stood through the winter and was fine before that. so it the STVA , can that be purchased? is it easy to change ? or there are complete K2 throttle assemblies on FleaBay at the moment-which is the best way to go? :bugga:
Has he tried taking it off and cleaning all the connections (Mark where it is before removal)
If that doesn't work adjust it I'm sure there's info on how to here .
I think you can get replacements but there not cheap .
You might also find Suzuki use the same part on other bikes to give him a better chance of finding one 2nd hand .
:cheers:
I'd lube the whole thing up with a good spray of WD40 or similar as it's probably just gone sticky over the winter. Follow that by balancing the throttles & then setting both the TPS & the STPS.
That's fixed everyone I've ever seen with this issue.
Obviously if it's sticky then it won't be moving correctly. But the ECU only knows where it's moved by the readings off the two throttle sensors, so they need to bet set correctly which shouldn't be done till the throttles are balanced.
Clean all(!) the connections first, corrosion is the most likely as the bike stood over the winter.
Check for damaged wiring.
C28 doesn't have to be the STVA (yes, electronics can be a bitch). Can't remember the specific cases.
STVA new comes only with full TB assembly. All TBs (K2-7) can be used if you need to look at fleabay, wrecker.
There are repair options, sure someone will chime in here what can be done.
Just checked Robinsons and both sensors are available as spares
1 is approximately £127 the other is around £100 .
As already said check clean and adjust every thing first
Good luck
:onya:
Quote from: seth on Monday, 18 February 2019, 05:01 AM
Just checked Robinsons and both sensors are available as spares
1 is approximately £127 the other is around £100 .
As already said check clean and adjust every thing first
Good luck
:onya:
is the STVA part number 13580-42F00? if so £83 from Germany incl p & p :smile2:
@seth
I'm not sure which is which but it's either part 16 or 17 in the drawing attached to this post .
I'd seriously look at trying what others have said before buying these new parts .
Hope you get to the bottom of it .
:cheers:
STVA is not a sensor but the "squarish" actuator in the middle of the TB.
My mistake yes if it's that you can't get them as spares but I've not heard of an stva failing .
The butterflies and rest of the throttlebodies will be gummed up after sitting over the winter and in need of a deep clean and check and adjust as hooli has discribed.
:cheers:
Suzuki will tell you the STVA is not a serviceable part ... it is. The glue holding the magnets are a well known failure. If the chokes don't open & shut freely then my bet is a dislodged magnet. Reach under the right hand side to find the choke shaft. (see photo)
This subject has been well documented so search the archives.
The STVA is a stepper motor as far as I'm aware if we want to be technical.
I've heard of the glue failing a couple of times before too, but never seen it. I wonder if they used better glue on K2s?
Quote from: Hooli on Tuesday, 19 February 2019, 07:38 AM
I've heard of the glue failing a couple of times before too, but never seen it. I wonder if they used better glue on K2s?
The two that I've had go were both K2's. I don't know how common it is on later models but checking the chokes for free movement is the first thing to do if the C28 comes up. If there's any stiffness other than the slight spring pressure then you can bet a magnet has come loose but if it moves freely then start looking at the different sensors.
Picture shows the dislodged magnet. (they should be opposite each other). BTW, I used 24 hour Araldite to re-glue the loose magnet.
Thanks Snapey, mines not broken but will file your info. :cheers:
Thanks Snapey, she has already paid an *expert* to clean etc - he said its a common fault and needs a new part !! she has got hold of some throttle bodies complete as this is the easiest and cheapest way . Thanks for all the advice guys :)
Quote from: Notty on Wednesday, 20 February 2019, 12:25 AM
Thanks Snapey, she has already paid an *expert* to clean etc - he said its a common fault and needs a new part !! she has got hold of some throttle bodies complete as this is the easiest and cheapest way . Thanks for all the advice guys :)
I hope she doesn't leave the throttle bodies with the expert as he'll fix them & sell on Ebay. If she doesn't want them I'm sure someone on here would enjoy pulling it all apart & fixing the offending STVA. While it's in pieces I like to flush the injectors too.
Quote from: Snapey on Wednesday, 20 February 2019, 04:07 AM
Quote from: Notty on Wednesday, 20 February 2019, 12:25 AM
Thanks Snapey, she has already paid an *expert* to clean etc - he said its a common fault and needs a new part !! she has got hold of some throttle bodies complete as this is the easiest and cheapest way . Thanks for all the advice guys :)
I hope she doesn't leave the throttle bodies with the expert as he'll fix them & sell on Ebay. If she doesn't want them I'm sure someone on here would enjoy pulling it all apart & fixing the offending STVA. While it's in pieces I like to flush the injectors too.
You guessed Snapey - the deal she has done is to have the replacement bodies and if they work £160 and he keeps the old ones -as she can't do f..k all herself she has to pay her *expert* to fit them - FFS I told her she was a silly cow :bugga:
@Snapey @seth
I suppose if the "expert" is running a business he has to make a quid somehow. Mind you, removing & replacing the throttle bodies is a prick of a job best left to those who know what they're doing but my tip with the sheet metal helps there to keep the rubbers in shape.
Is it? I don't recall much hassle doing it, I've done a lot worse jobs on other things.
I bet the 'expert' glues up her ones & charges her 160 for the replacements & labour to fit etc.
If it gets her bike sorted all good but if he's taking a lend of her when he could just reglue her ones and refit them it's not right.
He might well just remove reglue and refit hers so tell her to mark them to make sure she's getting replacements .
It's always a problem when you can't do the work your a bit at the mercy of someone who can .
:frustrated:
Quote from: Hooli on Wednesday, 20 February 2019, 06:36 AM
Is it? I don't recall much hassle doing it, I've done a lot worse jobs on other things.
I find the air box doesn't go back far enough & without a couple of bits of sheet steel to aid removal then the rubbers & clamps can get distorted.
I must just have the knack of it then.
Update - replacement throttle bodies including sensors fitted and still error 28 bike still ticking over at 2-2.500 . Advised her to get multi plugs,ecu etc disconnected and use contact cleaner - (tip from Desert Fox, Scot could be battery?) - watch this space :bugga:
@seth @Snapey
Have you cleaned the contacts in the ignition switch?
That might solve some mystery errors....
My k2 had errors related to the chip reader / keycode. Cleaned the inside of my switch and I am error free....since 2017.
Quote from: Blubber on Monday, 25 February 2019, 03:27 AM
Have you cleaned the contacts in the ignition switch?
That might solve some mystery errors....
My k2 had errors related to the chip reader / keycode. Cleaned the inside of my switch and I am error free....since 2017.
What chip reader? UK bikes didn't get the chip in the key until K5.
Quote from: Notty on Monday, 25 February 2019, 01:52 AM
Update - replacement throttle bodies including sensors fitted and still error 28 bike still ticking over at 2-2.500 . Advised her to get multi plugs,ecu etc disconnected and use contact cleaner - (tip from Desert Fox, Scot could be battery?) - watch this space :bugga:
@seth @Snapey
The big grey multiplug under the LH cover & ECU multiplug is where I'd start. I'm pretty sure that's where the STVA plugs into the loom.
Quote from: Hooli on Monday, 25 February 2019, 08:21 AM
Quote from: Blubber on Monday, 25 February 2019, 03:27 AM
Have you cleaned the contacts in the ignition switch?
That might solve some mystery errors....
My k2 had errors related to the chip reader / keycode. Cleaned the inside of my switch and I am error free....since 2017.
What chip reader? UK bikes didn't get the chip in the key until K5.
Thats my point...My k2 neither ;)
Quote from: Hooli on Monday, 25 February 2019, 08:23 AM
Quote from: Notty on Monday, 25 February 2019, 01:52 AM
Update - replacement throttle bodies including sensors fitted and still error 28 bike still ticking over at 2-2.500 . Advised her to get multi plugs,ecu etc disconnected and use contact cleaner - (tip from Desert Fox, Scot could be battery?) - watch this space :bugga:
@seth @Snapey
The big grey multiplug under the LH cover & ECU multiplug is where I'd start. I'm pretty sure that's where the STVA plugs into the loom.
Cheers Hooli - I did tell her to do this weeks ago but hey ho ..will tell her again :bugga:
After what's been tried and said I'd go with a dodgy connection somewhere too .
As blubber says the lower half of the ignition switch is a common place for corrosion as from experience Suzuki didn't use much grease to protect the electrical connectors from damp getting in.
The big multi plug is also common as hooli has said.
The parts on these bikes only go faulty occasionally and are fairly well documented .
The biggest problem is connectors and our damp cold weather.
:cheers:
This is how it can go:
Quote from: INSTG8R on Wednesday, 10 May 2017, 05:16 PM
Ive got a STPS issue as well.
Here is part of the conversation with the mechanic.
"I have removed your secondary plates but the shaft has to stay. Yours goes through all the right motions, doesn't get stuck
The mechanic has replaced the STPS and the STVA even though my old ones tested ok. Also tried with butterfly paddles removed, no difference.
I have have even removed the plenum to take it back to a STD bike and still have the error, Checked the side stand switch, check valve added, wiring harness checked, changed out throttle bodies with a different motor. I'm trying the same guy to see if i can get a complete ecu and dash setup to try. We have tested the wiring, The pins at the ECU, even replaced a set of throttle bodies with all the sensors from a running bike with out the issue, tested the resistance of your secondary motor through its cycle and it tests ok.
we have tested the wiring, ecu and the STVA, every things seems to work and is adjusted as per the factory specs. it just as soon as the stva operates we get the error,"
Sent ECU to Holland for fault diagnosis, repair and tested ok.
Everything operates as it should. STVA actuates at start up and moves as engine warms up but the STPS still throws up an error code.
He has run out of things to test.
Any thoughts @alfadave ? He even disconnected the Supercharger and set back to standard. It's only been 5 months off the road :furious:
Quote from: INSTG8R on Thursday, 25 May 2017, 01:04 AM
The Good news is they found a broken wire in the harness between the Intake Air temp sensor and the map sensor. No more FI fault codes. Yippee!
I assume the above was a C29, but it was posted in a C28 thread.
Connectors and wires, even those that are not EFI-related need to be checked. Seem to remember that one had a faulty fan switch (or its wires) but can't serve with a quote/source.