TheHoffmann

As far as I understand you don't need the bulkhead harness if you are just swapping for a manual. You may need to repin your ecu to fit the manual pinout, and flash your rom but that's about it. I had to switch ecu's because I added a turbo, but for just a mnaual swap I don't think you need a new ecu.

Flash a manual rom onto you ecu and you're good to go. I replaced everything so it was new, but I got a lightened flywheel for some better revving.

Ok, searched the forums on how to pull the map of the ecu. I found a stock jdm lgt manual map on the romraider forums, flashed it to my car and everything is working 100%. No more Er Hc codes, cruise works, 100% throttle pedal equals 100% throttle plate...Couldn't be happier, gonna log some cold start values to make sure everything works as intended, then it's of to get engineered Thanks for all the help guys

Tactrix cable just arrived, immediately jumped in the car and checked the ecu. AVCS does seem to NOT work, cruise doesn't work and throttle body does only do 35% max. I do not have SI drive, but the donor car maybe had SI drive, I don't know (just bought the ecu).

Yeah tried the manual pin, but Er HC Codes are there, cruise doesn't work and somehow my throttle doesn't work 100%. If I flash to the manual and the codes are gone, thats already a win. I did wire cruise up the right way, but gonna check when the new map is flashed. Does somebody have an idea why the throttle would't open 100% when you push the pedal 100%? Either the actual valve is shot or wiring...

Ah I see, ordered a tactrix so gonna flash my auto to a manual rom. This explains why I get Er HC Codes in my dash. Will my cruise work after the flash or do I have to change something else? Is a 05 ecu

Why dou you have to flash a manual rom onto the auto ecu? Afaik If you ground the TCM pin the ecu knows it's in manual mode. or are there different manual modes? Like cruise control for example not working...

Just found this thread and happens to be mostly the same as what I'm trying right now. Swapped an ej20y engine into my na legacy, and with it the 6mt. Got myself an auto gt ecu, and need to flash a manual rom aswell and rewire it. May I ask if you wired it since and where you got the right wiring diagram? And how difficult is it to flash the manual rom (or where to get one)?