STVA and -C28 error codes k4-k7 600/750 - Page 3 - GSXR.com
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post #81 of 162 (permalink) Old 10-04-2014, 01:08 PM Thread Starter
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The zip is just a simplified version of the factory instructions.

Pin #34? I thought it was 30 that you were supposed to pull. Get a factory manual and follow the testing instructions for the STVA. It's pretty simple if you've done wiring tests before.
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post #82 of 162 (permalink) Old 10-04-2014, 03:16 PM
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I haven't done a wiring test before and you are correct it is 30, I said 34 by mistake but i have did pull 30. Unfortunately the light is still on which is what they said pulling 30 would stop as well as keeping the valve open. I do not have the manual as a reference either unfortunately. PS you also mentioned in another post in another forum that it's covered under a emissions warranty if it's under X amount of miles? i've been crawling the forums for a good bit now I see you have been around for many years helping other lost riders as myself.

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post #83 of 162 (permalink) Old 10-04-2014, 07:57 PM Thread Starter
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You're way past warranty. It's 5 years or 30k kilometers.

Put in dealer mode and find out which code it's giving.
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post #84 of 162 (permalink) Old 10-05-2014, 04:04 PM
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Getting C28, and I was hoping it priorities miles over year but it was worth a shot to see if it was still under warranty even with the years
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post #85 of 162 (permalink) Old 10-06-2014, 08:09 AM Thread Starter
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Nope. Whichever comes first.

The bad news is that you have an 07. The 2006 and 2007 models had a crappy charging system. It's only a hypothesis, but the C28 codes I've seen from these two years are always due to the ECU being damaged. If you test the STVA per the instructions and it tests good, you're probably one of these unlucky owners. The STVA on these two years is pretty tough and a true failure is extremely rare.
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post #86 of 162 (permalink) Old 10-06-2014, 07:25 PM
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Where can i find that charging test other then the Manuel I dont have? also is "flashing the ecu" something that actually could work? so far theres 1 ecu one bay and it aint cheap. Funds are strained at the moment so just looking for the least available way to fix, what possible complications or damage might I run into if I am unable to get this done soon other then the lack of acceleration/speed that I am currently experiencing

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post #87 of 162 (permalink) Old 10-07-2014, 08:25 AM Thread Starter
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If circuits are burnt out on your ECU, flashing it won't fix them.

www.servicemanualsgsxr.com.
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post #88 of 162 (permalink) Old 10-23-2014, 08:56 PM
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I ride an 01 600. I have been battling power loss all for a few months now and every time i think i have it pinpointed I'm still off. Here is where I'm at now...i have no fi codes showing up. If i start the bike the butterflies cycle but then if i go full throttle it just lopes between 3&3.5 rpms and won't actually rev. If i reach down while I'm wot and move the butterflies manually it flies straight to the red line. Also, there is always a humming/squeaky sound coming from the stva. Can it b possibly be a bad stps even tho i have no codes?

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post #89 of 162 (permalink) Old 10-24-2014, 06:27 AM Thread Starter
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Hard to say. I guess it's possible that the STPS is sending incorrect information, but that's a really hard stretch of the possibilities. I don't have much experience with the 2001. The fact that it cycles on startup, but not while running, and gives no codes makes me think ECU issues.
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post #90 of 162 (permalink) Old 12-04-2014, 01:58 PM
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I got a 2004 gsxr 600. I had the head replace not too long ago because one of my spark plugs came lose and it broke the part where it goes. Got it back from the shop then it started bugging out when driving it. Took it back it was a coil. Had it for another week or 2 then it started doing it again but less and only at high speeds. I didn't take it because it wouldn't do it as much and the shop would take long to give it back. I was riding to school and the -c28 code came up. I did the soldering that worked for 1 day lol. A friend helped me and it has been good the code doesn't show up anymore the only problem i have is that it don't want to start after i ride it somewhere. It turns on on cold starts the idle is very low but i try adjusting the idle screw didn't work. It doesn't die tho. then i go to school but i want to leave before it gets cold again it won't turn on unless i keep trying it for a long time or give it gas. What can it be? Thanks
I am thinking maybe it has to do with the STVA since it started after the code came up.
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post #91 of 162 (permalink) Old 12-05-2014, 07:05 AM Thread Starter
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Most likely not STVA related. It does engage the fast idle mechanism, so the fast idle might be set a little low.

When the bike is warm, what is the idle speed?
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post #92 of 162 (permalink) Old 12-07-2014, 03:15 AM
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Great write-up. Glad there'll be a nice sticky for this issue, I could have used it when I had to fix mine.
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post #93 of 162 (permalink) Old 12-09-2014, 09:39 PM
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Stva

I am having issues once more, i purchased a used known working throttle body with a known working STVA when i put this on my bike im at a warm up idle of around 2k then it dives and sputters out with a c-28 code. The reason i bought all new stuff was due to the c-28 and a fuel injector went out so i figured just buying it all at once on a throttle body would solve all the issues well almost except for the STVA fault which i have no clue were to go with this. I did all the trial and error of testing on my old one and no dice. What is wrong with it?
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post #94 of 162 (permalink) Old 12-10-2014, 07:55 AM Thread Starter
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They can bench test good, but still be bad. Just the nature of the failure. It's also possible that you have a loose wire. You can do "full circuit" testing to look for obvious problems, but you can sometimes put pressure on the wires at the ECU and see the problem go away. I've seen loose contacts at the ECU cause these issues. They can be very hard to find.

Go to the link in post #52 on this thread. Pretty good instructions there on how to diagnose.

Last edited by Chuckster; 12-10-2014 at 08:00 AM.
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post #95 of 162 (permalink) Old 12-10-2014, 07:15 PM
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new found info

Ok so i checked the cables for proper connection and everything is good except the TPS. like i said before this throttle body came off a known good bike so all the parts are good and when i tested what voltage was coming out of the tps connector i got 4.94 on positive to ground then i got 2.72 out of the positive and br/bl or whatever it is that the manual calls it. is this a sign of a ecu?
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post #96 of 162 (permalink) Old 12-11-2014, 01:52 PM Thread Starter
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TPS, or STPS? Gotta be careful and know what you're looking at.

Possibly. According the the manual, your Red to ground test is good, but Red to Brown is not. First think I would do is leave my meter hooked up to those wires and start manipulating the BR wire at the ECU connector to see if the reading changes.
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post #97 of 162 (permalink) Old 12-11-2014, 06:22 PM
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at the tps...i was going to do the temporary deal with just taking off the stva and and zip tie it so that i can atleast get back and forth to work. But once i did the c14 code popped for the tps and my manual told me to check those connections and that is what i got and also what i did was leave those in and move connections around to see if it would change and it never did. Any suggestions?
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post #98 of 162 (permalink) Old 12-12-2014, 10:08 AM Thread Starter
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Sounds like you got your STPS and TPS connectors reversed. They're nearly identical except that the TPS connector is grey, and the STPS is black. If you had those reversed, it would explain everything.
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post #99 of 162 (permalink) Old 12-12-2014, 04:31 PM
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another question

I got the problem to clear was some dirty contacts on the stva. one last question. when i go to adjust for the line on the -C00 is that stps or the tps i need to move in order to get it to work that way i need to? also ever since i got this going i havent been able to get it to start and run great i can get it started sometimes but when i give it some throttle it just bogs and dies and sounds like its struggling just to get past that 3k mark. atm my code reads C00 but the alignment mark is high.
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post #100 of 162 (permalink) Old 12-12-2014, 06:18 PM
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you tube link

this is my link of my bike after all is installed and i cant get it going.
https://www.youtube.com/watch?v=_fMX...ature=youtu.be
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post #101 of 162 (permalink) Old 12-14-2014, 07:21 AM Thread Starter
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The line indicates the TPS adjustment. The secondary throttle shaft has a cam at the opposite end of the STVA. That cam is what actuates the fast idle system. What you can do is unplug the STVA and turn the secondaries closed by hand. While they're closed, adjust the TPS.

A faulty STVA won't cause the issue you're seeing.
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post #102 of 162 (permalink) Old 03-22-2015, 01:04 PM
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Can anyone help me ?

I got the dreaded c28 on my 600cc K4 last month, I have got a working replacement and put it on but still got error.

Then I read you just can not put it on..dohh

Could some one please tell me the correct way to put the STVA back on ?
I'm not the greatest tech guy, ride yes but tech issues I'm not that great.

Thanks
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post #103 of 162 (permalink) Old 08-12-2015, 01:51 PM
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It's an easy fix if u have a soder gun u have to take the sensor apart and soder the electrical connectors
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post #104 of 162 (permalink) Old 08-16-2015, 07:48 PM
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I was going to make my own thread by seeing as there is so much information on this thread I might as well post it here to keep all the information in one location.

I just want to start by thanking TheGeek (Chuckster) on all his help whether he knows it or not. A lot of the threads Ive been through, to which TheGeek has responded to, has helped me narrow my issue down. Hopefully you can help resolve my issue as I am stuck.

Some quick info, I have a 2007 GSXR 750 that has been sitting for about 4 years, sat so much the gas tank had rust in it. I finally got it all running but I have the C28 and C22 error code. I have not gone through the C22 code just yet. I hoping I just need to replace the sensor. I don't think these 2 codes have anything to do with each other but someone may know otherwise.

So I have a GSXR 750 with the infamous C28 STVA error. I went through all the steps but I am not sure what is wrong. I started off by checking the resistance on the ECU connector, pins 1,18 and 2,19 both sets read 8.6 ohms. I know ideally it should real 7.0 ohms but I have a harborfreight multimeter which may be causing the discrepancy. Next I checked the STVA resistance and that also reads 8.6 ohms.

Next I checked the resistance from the ECU connector to the STVA connector plug which should read 0.3 ohms. So the resistance from pin 1 to 1 and on 18 to 18 read 1.4 ohms. But here is where I ran into an issue. When I checked pins 2 to 2 I didn't get a read out but for some reason pin 2 on the ecu connector to pin 19 on the stva connector I received a 1.4 ohms. And also pin 19 on the ECU against pin 2 on the STVA. I am not sure why this is happening. I highly doubt anyone has swapped the wires although I cannot confirm this. Sorry if this is confusing hopefully the video will help.

Additionally just to rule out the ECU, I took my 750 ecu and put it on buddy's 600. I know its not the same but that is all I have available to me. I ran his bike for about 3 minutes with my ecu on it and the F1 code did not come up. Im not sure if I should have run the bike for long or if a 750 ecu on a 600 would even work for this. I also took his 600 ecu and put it on my 750 bike and the F1 code was still there. I am kind of hoping its a wire harness issue since the ECUs are outrageously expensive and hard to come by for this year (WHY?).

Here is a video of my test which may help to better show my issue.
https://www.youtube.com/watch?v=HsavDpupXOE

Thanks in advance
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post #105 of 162 (permalink) Old 08-17-2015, 06:18 AM Thread Starter
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Certainly sounds like it could be a wiring issue. What are the wire colors on the ECU connector pins 1, 2, 18, 19? You may have just lost track on the pin layout on the STVA connector.

Last edited by Chuckster; 08-17-2015 at 06:36 AM.
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post #106 of 162 (permalink) Old 08-17-2015, 08:51 PM
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Quote:
Originally Posted by Chuckster View Post
Certainly sounds like it could be a wiring issue. What are the wire colors on the ECU connector pins 1, 2, 18, 19? You may have just lost track on the pin layout on the STVA connector.
So the wires are as follows:
ECU Connector
1 - White with Black Strip
18 - Solid Green

2 - Pink with white Strip
19 - Black with Green Strip

STVA connector
1 - White with Back Strip
18 - Solid Green

2 - Black with Green Strip
19 - Pink with white strip

So they are definitely flipped but which is the correct order? Is it hard to pull the wires out of the connectors?
Attached Images
File Type: jpg STVA 3 wires.jpg (20.5 KB, 35 views)
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post #107 of 162 (permalink) Old 08-18-2015, 07:46 AM Thread Starter
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Looks like your ECU plug is correct, but I'll be damned if I can't find the pinout for the STVA connector. I know your numbering would be correct on the 04/05, but on the 07 I don't have a bike to compare.

Untitled.jpg

As for removing wires from the connector, it's almost an art. Terminal tools make it easier, but a sewing needle will work in a pinch. I'll see if I can get some decent pics of how to do it for you.
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post #108 of 162 (permalink) Old 08-18-2015, 08:35 AM
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Quote:
Originally Posted by Chuckster View Post
Looks like your ECU plug is correct, but I'll be damned if I can't find the pinout for the STVA connector. I know your numbering would be correct on the 04/05, but on the 07 I don't have a bike to compare.

As for removing wires from the connector, it's almost an art. Terminal tools make it easier, but a sewing needle will work in a pinch. I'll see if I can get some decent pics of how to do it for you.
Oh I have the 06 GSXR 600 manual, I didn't even think to check there. It is exactly the same of the 04-05 models.

STVA Connector should be
2 - Pink w/ white strip
19 - Black w/ Light Green strip

Once I leave work I will stop at harbor freight and buy some terminal tools to flip these wires. I will attempt to search the web later for 'how to' instructions if you don't happen to come across any.

THANKS FOR ALL YOUR HELP
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File Type: jpg STVA.jpg (19.3 KB, 36 views)
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post #109 of 162 (permalink) Old 08-18-2015, 10:13 AM Thread Starter
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The terminal tools need for the GSXR you won't find at Harbor Freight. They're not a common automotive size. Don't screw with it until someone on here can confirm that the wiring at the STVA end of the harness is right or wrong.
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post #110 of 162 (permalink) Old 08-18-2015, 10:36 AM
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Ok I will hold off, can some one please confirm the pins on the STVA connector plug. Thanks
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post #111 of 162 (permalink) Old 08-18-2015, 12:55 PM Thread Starter
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Actually, I still have Moxxi's TB's and harness in the garage. I can look tonight.
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post #112 of 162 (permalink) Old 08-18-2015, 03:59 PM Thread Starter
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Your connectors are wired correctly. Look just like the ones I have here.
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post #113 of 162 (permalink) Old 08-18-2015, 06:18 PM
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Damn, I was really hoping that was it. Now I'm back to square one. I'm not sure what to check next. The video I posted earlier shows all the steps I performed and they all seem to tie out. My next assumption is the stva is bad.

Any suggestions?

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post #114 of 162 (permalink) Old 08-19-2015, 05:56 AM Thread Starter
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Clean the connectors. Then put pressure on the wires leading into the connectors. Loose connections are sometimes the cause, but the most difficult to find. Also check your STPS resistance. I've seen sensors fail in such a way the bike thinks the STVA has gone crazy and throws a C28.

Last edited by Chuckster; 08-19-2015 at 05:59 AM.
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post #115 of 162 (permalink) Old 10-06-2015, 07:44 AM
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Quote:
Originally Posted by Chuckster View Post
Clean the connectors. Then put pressure on the wires leading into the connectors. Loose connections are sometimes the cause, but the most difficult to find. Also check your STPS resistance. I've seen sensors fail in such a way the bike thinks the STVA has gone crazy and throws a C28.
When key is turned on will the butterflies still cycle if the sensor is the issue?

I have the C28 on my 05 600. I'm looking to test the STVA before I pull it off the bike. I see your zip files with testing procedures, but I can't open them, and I have not found another test procedure yet. So far everything I see is everyone pulls it off and repairs it. I was just looking to verify it before I pull it off tonight.

Edit: I plugged it into my sons 05 600 and it posted the error on his. So I repaired it. Good info here, thanks!

'05 GSX-R1000- Yoshi, K&N, PCV
'05 GSX-R600- 1K header, M4 slip on, K&N, PCV

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post #116 of 162 (permalink) Old 10-07-2015, 10:38 AM Thread Starter
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Typically when the STPS is the issue there's a pretty clear behavior. With the bike cold and the secondaries closed, upon power up the secondaries will start to cycle open normally. About half way open, the start to return closed but at about half the speed at which they would normally open. This is the ECU hunting for the calibration point that it can't find because of the failure. They will reach the fully closed position and stutter against that stop and then just stay closed and throw a code.
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post #117 of 162 (permalink) Old 10-07-2015, 12:00 PM
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04 gsxr 600

Ok so I read up on the C28 fault code and I did what the geek said to do except for one small thing. When I took the STVA off to test it I did not make sure the valves were closed so now I cant get anything to line up properly and the valves are stuck wide open. Please help Im new to working on my bike but if explained to me Im handy with general mechanics. How do I get everything back to normal. If you need pictures more info etc... let me know and I will send.

Thanks
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post #118 of 162 (permalink) Old 10-08-2015, 07:15 AM Thread Starter
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Put the STVA half way on, turn the secondaries closed, then push the STVA the rest of the way on. The sensor is spring loaded closed. You just need to put the rest in the same position.
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post #119 of 162 (permalink) Old 12-06-2015, 09:22 PM
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I just wanted to say thank you, my k5 750 endured the -c28 code and after researching your information I was able to save a thousand dollars on a new throttle body assembly and repair the issue myself. Many thanks The Geek!
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post #120 of 162 (permalink) Old 01-14-2016, 10:31 PM
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Hey I was just wondering about the STVA/STPS! I have a k7 600, I cant open the zip file on my iPhone 6 so maybe this is an easy question to answer. Are the secondary valves suppose to close fully after turning the key ON, then return to fully open? Because mine only slightly turn then go back to full open.
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