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Old 01-15-2021, 03:35 AM   #1
Scooby Newbie
Member#: 518883
Join Date: Sep 2020
Default 2006 wrx wont install accessport

So i got my cobb v3 accessport brand new un-married from a performance shop in quebec awhile back and went to install it in my car and it said "error unknown rom detected". I have checked that the cable is firmly plugged in and the accessport has the most recent firmware.

so I took it to an autoshop in southern BC. as im from the north and dont have an autoshop capable of doing a pro-tune. So i figured i would just get the shop to install it aswell along with a new fuel pump, injector cleaning, tune up and dyno run.

the shop said they couldnt figure out how to install the accessport either which is strange considering one of the things they specialize in is pro-tunes. So im thinking i need to maybe reflash the ecu back to stock ( which the closest dealership said they couldnt/wouldnt do) so im able to install the accessport ?? Can i do this myself?? and what kind of tools(tactrix cable , computer ect.) do i need to do so??

Any help guys greatly appreciated as its been months and cant seem to get this resolved
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Old 01-22-2021, 03:14 PM   #2
Scooby Newbie
Member#: 429521
Join Date: Sep 2015
Chapter/Region: NWIC
Location: WA
2015 STI


I usually find this error when a speed density rom has been flashed on the car previously. The accessport cant/wont overwrite it.

Was the car modified when you bought it? Any history of the car from previous owner? Maybe a speed density patch was used for launch control and flat foot shifting etc. if no other mods.

You would need to get a set of defs loaded on EcuFlash that match whatever custom rom was on there. I would try MerpMods def tables which can be found on Github using a google search. My suggestion is to find someone in your area who is experienced with Tactrix and the supporting software. Have them try to read the rom, save it, transfer any needed tables to a factory rom so the car will still start and drive. Again, not sure if your car is modded (injectors, 3 port, etc.)

hope this helps.
ElroyDanabe is offline   Reply With Quote
Old 02-11-2021, 12:12 AM   #3
Scooby Newbie
Member#: 34368
Join Date: Mar 2003
Location: pasadena, CA

i had a similar problem. it was believed that my ecu was tuned with either ecutek. without removing it AP couldnt be installed. i got another stock ecu and tried again and it worked.
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