tatsuo8088

Update I found someone local that was able to desolder the eeprom from the dead ECU and solder it on to the used ECU. I installed it today and started it 4 times to test. So far no smoke was let out, and the car runs perfectly as it did before. I did a code scan, and no codes. Fingers crossed that this was a one off event. Thanks everyone!

Thanks, that was the plan to tow it to the dealership and program the replacement ECU to the car.

I bought an ECM that was off a 05 Legacy GT, with automatic. Same part number but with a D revision instead of a B. If I'm understanding correctly I won't be able to marry the BIU and ignition tumbler on the car to the replacement ECM?

Cool, this makes me feel better about putting in another ECU.

Thanks m sprank. So I guess would I be correct in assuming that there is no short in the wiring harness? I would think that if there was one, a fuse would have popped or the car would be running bad followed by a check engine light. Before the car failed to start, it was driving perfectly. I had a scan tool attached to monitor what was going on, and nothing felt or appeared out of the ordinary.

Thanks for the offer KZJonny, but I have an ECU ordered from Ebay for about 100 bucks, so not bad. Update: I noticed that one of the ICs looked like it overheaded. So now I guess I'm more confused as to what lead to what.

Hello everyone, So I have a weird situation. I have a 2005 Legacy GT wagon whos ECU decided it wanted to BBQ (pics below). I also included pictures of a non-BBQ'd ECU from ebay to compare, and from the looks of it it seems a mosfet caught fire and took out a diode on the backside of the board. The back story, I had just registered the car after a year of putting it back together and wanted to daily it to test. For 4 days the car was running great, and no codes. The day the ECU let the smoke out, I had driven it around and parked it a couple times to run a few errands. I then decided to go to the hardware store, and at the hardware store turned the key, no crank, Er HC showed up, and smoke coming from the ECU. I immediately ran to unhook the negative terminal. Some history, the car had a blown turbo and was given to me because the previous original owner didn't have the time to work on it anymore. So I replaced the turbo, redid some seals, replaced the turbo intake pipe, and replaced the intake manifold because the pressed in threads stripped out. The car has been sitting for 7 years before coming into my ownership. To my knowledge, the car is stock other than the addition of an aftermarket alarm with remote start. I have a couple theories as to what happened. 1. The ECU just failed because its been sitting in a relatively humid environment in Hawaii. 2. I accidentally triggered remote start couple days prior to it not starting and started a chain of events 3. I have a short in the harness somewhere. My plan of a attack is to reattach the battery, and test every pin for 12v where there shouldnt be. Other than that, are there other tests I should run? Can a short cause damage like that? I would think I would get a code or trip some sort of protections with-in the ECU to prevent such damage. Lastly if anyone can tell me what circuit that mosfet belongs to would greatly help in narrowing down a circuit to test. Thanks