Part number 2800A135 is the TC-SST ECU ("transmission control unit" inside the SST)

I got the pic from this thread in evoxforums

http://www.evoxforums.com/forums/showthread.php?t=32232

 

After I replaced my clutch packs my car was running fine for three months then suddenly it happened, I got p1833 and through a lot of reading most likely one of the TC-SST sensor is out.

So you will need to change your TCU as so far no one i heard has repaired the sensor on the TCU so you must replaced it , it cost about 2500 usd for the TCU
and 2800A135 is the TCU part number.

 

I've just received an email from Kris SSP telling me my problem could be a clutch seal failure. He said P1833 is a generic CEL due to failure of the clutch seals.

So I don't really know which is which right now

 

i've heard that it could be the clutches seals too or maybe the clutches are just worn.
have you tried any of the fixes yet?

 

Not yet. Maybe next few weeks. I'm contemplating either to buy or not to buy the TCU since I'm only in the US once every few months.

 

Finally settled my problem, cost me about 2500 USD for labor, repairs and used SST part.
I got 2 different set of codes, but P1833 went missing.
•P184B: Shift fork 4 malfunction
•P1832: Shift fork position sensor 4 system (Voltage high range out)

After i sent it to "Uber Garage" in Singapore, i found out my freakin'

SHIFT FORK BROKE!

After they scavenged a shift fork from 2 spare gearboxes they have, they installed the clutches using procedures to install new clutches and now no more problems.
The workshop is an official dealer for SSP with SSP training so they told me the workshop I sent for my clutch installation didn't do a proper job installing it.
They told me the Evo SST is quite tricky to install compared to other cars that uses twin clutch gearboxes.

So what i can say from this experience is:
1. the codes will not tell you what exactly is wrong with your gearbox
2. do your sst overhauls with workshops that has SSP training/proper training or you will f**k it and will learn it the hard way like i did.

Side note: one of the gearboxes the workshop serviced had fried the main-board of the TCU due to using Willall oil. So they don't recommend any other oil that doesn't pass the manufacturers test.

 

wow thanks for all that information and keeping us posted on what happened. I fortunately was warranteed. I know that doesn't help anyone else that will go through this.

I purchased the car at Subaru dealership and opted for the powertrain warranty which cost me about 1700 dollars or so. the warranty was through Toyota because that was the main dealership at that area; and they owned the rest of the dealerships around.

I brought it to a Mitsubishi dealership and they did some test drives and made the problem happen and called the Toyota warranty company to have an auditor/inspector come out. they were able to verify the problem and away we went with the warranty work.

took them about 3 days to swap out the trans after they got it, and it took the trans about 3 days to arrive.

my transmission feels really great now. I tried to buy the bad trans that they took out but they wouldn't allow it. I really wanted to tear it open and see what happened in mine. and maybe I would of had it repaired and beefed.

what happened to your transmission looks pretty close to what jack's transmission said was happening to the shift forks.

thanks again for contributing to the thread. I wish I could of been able to help but I was fortunate enough to have my work covered.

btw my car was stock when this was happening: 50-59k miles the issues started.
by the time I had the work done the problem would occur every time I used the car.

 

What year model was yours evostormtrooper 08-09?

 

Interesting a bad aftermarket clutch install caused a shift fork to break.

I thought it was odd others were talking about clutches and seals when you're CEL shows something related to a shift fork.

 

Sorry If I came back late, mine is 2008 JDM

 

Usually when the transmission sets a shift fork related dtc, it's related to...
the shift fork, or its magnets. Clutch seals don't set shift fork dtc's......go figure.

 

Same issue on mine 2011 evo with 14k miles. 4th gear disappeared last week and yesterday, even gears. What to do? I'm already out of warranty

 

I FINALLY got back on my feet enough to send it down to the Mitsu Tranny god himself "John Sheppard" once he figures out what was with mine... I'll put my findings on here. He told me when he's seen this before, it was a leaking seal, or a sensor inside the transmission that looks at shift fork position???

 

I would use the auto normal mode and stay out of sport mode until u replace new clutchs packs!

 

The problem is that some people here say it's not the clutch that causes it :-/