Guys, I've been searching this site for last few days for information on replacing my ecu. I'm not using any afc, just picked up another stock ecu and would like to install it. I've heard that there is a process that I need to follow but dont know if this is true.

I know there is a technique in programming a replacement key. So you techies please let me know if I can simply sway out (my ecu) or do I have to turn the key on and hit the brake, while saying 'i luv u' to my car.

Anyone had to change their fried ecu?

 

You can't swap it out with reprogramming it for the immobilizer. I couldn't tell you how to do that, but it has been discussed on here. Search for "immobilizer" or "switch ecu"

 

So in theory you could have one ecu flashed and one stock? Im trying to think of an autocross setup for the class A Stock which doesnt let you modify the ecu and one for the drag strip which would have better fuel maps for running 100 and up octane. John

 

Maybe, but I haven't heard of anyone doing it, and I'm not sure why. We used to swap DSM ECU's like candy, but with Evo's it's more tedious. I don't know the ins and outs of it, so I can't provide a detailed answer.

As for A-stock, you can only have a cat-back and no other power mods, so your car won't be much use on the drag strip. If you have a cat-back as your only mod, then get a flash for daily driving, that flash won't be useful for high octane. It will be useful at 93oct or whatever your highest pump gas level is. If you get a flash designed for 100oct, then you'll only be able to use that ECU at the drag strip, and you'll drive daily with a stock ECU, which is a waste.

 

Okay thanks for your help. John

 

I can have 2 ecus working in the car but it's costly and I need the original.

Sean

 

Is the main cost in getting another stock ECU to use for the project?

Is there a market for stock ECU's for people who want to do this? I am running the AEM EMS, and if it was worth my while financially I would give up my stock ECU (sitting on a shelf in my office) for someone wanting to do this.

Another source would be people with totalled EVO's. Nobody puts their stock ECU up for sale because they think there is no market for it.

Later,

Keith

 

I want to flash one and leave the other original. Guys, I don't want the main question to be lost...

Does anyone know if there is a procedure for replacing a stock original mitsu ecu with another stock original mitsu ecu (from the same model car)?

 

Sean Ivey already said yes to your question, and he said it was expensive. I was trying to get more information for you about why it was expensive, but if you don't want my input fine.

Keith

 

The only way to get 2 stock ecu's to work in the same car (plug and play) is to have 2 imobilizer ecu's as well.Trust me,I have tried it the other way.You program one key to your 1st stock ecu and car runs,you program same key to 2nd ecu and car starts,you plug your 1st ecu back in and car wont start,even though it was programmed to that key.2 way communication between ecu and imobilizer ecu(ecu talks to imobilizer ecu and imobilizer give conformation on if it is ok to start)Believe me,tried every other way to make it work(easily)and it didn't,and I have direct access to a M.U.T.,anyone who tells you different is full of #hit,and I will put $100.00 cash on that Pepsi Challenge.....
The cost effective way to do what you are trying to do is purchase someones imobilizer ecu who went stand alone as it servers no other purpose once you go stand alone,mine cost me $30.00 shipped from another member on here that had a totaled evo that he was parting out.They cost like $178.00 new from mitsu.
I believe what SEAN I is refering to is he has 2 ecus working in his car,his stocker and his EMS which does not need nor use the imobilizer,and is COSTLY

 

I must thanks all for responses thus far, especially turboDan as he's the only one to understand my plight, which is simply to have a back up ecu that can be swapped at anytime, forget everything else cause THAT'S IT! Simply to swap in and out whenever I want.

It makes sense that the key will have to be programmed each time. I think it's time I gave more details so:

Earlier this year I sent my ecu in to a 'reputable vendor', who's here on evom.net, but he was unable to 'write' to my ecu as it was from a JDM auto. I've purchased another ecu from the same model car and found another vendor who says he can flash for my year/model but I'm thining of sending him the 'new' stock ecu to flash. So I'm trying to find out in advance if I can EASILY swap out/in the ecu. The swap may only be a one time thing if all goes well.

So now that we have more details ... anyone here swapped yet? If yes, were there ant probs?

 

Turbodan, there is a unique code that the ecu must have to work with the Immobilizer in the car, it is a 4 digit code.
If you use the Mut from mitsubishi you cannot alter the code on the engine ecu, as far as I know, you change the immobilizer ecu code.
I can change the immobilizer code on the reflashed ecu, so that it matches the code in the original engine ecu, and this will match the immobilizer code.
I havent actually tried it, but once you can change that code in the engine ecu the car will run with the immobilizer. In order to get the code I must have the original ecu that the car starts with.

I will Question the Gurus at Ecutek about this and see if they can give me a difinitive answer.

Hope that helps.

Sean

 

I have an extra 03 evo ECU plus the keys for 150.00 plus shipping. if anyone is interested.

thanks Mike

 

Sounds like turbodan owes Sean $100.00

Keith

 

Okay well, I'm trying to buy someone's ECU w/ immobilizer so I can have one ECU flashed and one stock (for emissions). Now, if I have immobilizers for both, would I just need keys for both and they would plug and play in and out as long as I switch immobilizers too? Cause, that's what I understand at least.