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ECU replacement
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Old 09-08-19, 10:52 PM   #1
UrdnotWrexSTi
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Default ECU replacement

I think the ECU in my 2008 STI took a shit after I shorted out an injector wire... Say I get a brand new ECU from the factory, what will I need to install it? Do I need to program or calibrate the at the dealer? Do I need to replace other components along with the ECU? Or can I just buy a new unit, download my tune from the AP and will it be turn key ready?
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Old 09-09-19, 04:57 AM   #2
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Default Re: ECU replacement

Been confused about what is and isn't working in your car. In any case you need to be able to unmarry the AP from your current AP.

If you can't you'll need to get Cobb's assistance. They can unmarry. Normally there is a significant charge . Expect you'll need to send it to them too.
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Old 09-09-19, 05:06 AM   #3
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My AP turns on and connects to the ECU so I’ll be able to unmarry it, so that’s not a big deal. I’m just not skilled with diagnosing wiring/electrical issues. All I can say for now is that my entire injection system is down. Fuel pump doesn’t turn on and no voltage at the injector plugs. I’m thinking I find a used ECU that matches my car and plug it in and see if it turns on the fuel pump and I get power back to the injectors. If that’s the case then my ECU is the issue.
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Old 09-09-19, 09:25 AM   #4
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Default Re: ECU replacement

Have you checked over your fuses?
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Old 09-09-19, 09:44 AM   #5
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Quote:
Originally Posted by yamahaSHO View Post
Have you checked over your fuses?
I have and none are burned. Would you happen to know where the main relay is on a 2008 STi? I don’t think it’s under the hood
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Old 09-09-19, 09:51 AM   #6
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Default Re: ECU replacement

on a previous vehicle I had two ECUs. 1 for pump gas, and 1 for E85.

I had to get the dealership to flash the 2nd ECU with the stock tune and change the VIN as the car wouldn't start without it.

However, I am not sure if Cobb can do this for you.
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Old 09-09-19, 10:06 AM   #7
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Quote:
Originally Posted by Leemanfor View Post
on a previous vehicle I had two ECUs. 1 for pump gas, and 1 for E85.

I had to get the dealership to flash the 2nd ECU with the stock tune and change the VIN as the car wouldn't start without it.

However, I am not sure if Cobb can do this for you.
Hmmm so the first ECU was your original unit that got tuned on pump gas and the second ECU was a used unit that had another VIN programmed to it or was it new?
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Old 09-09-19, 10:19 AM   #8
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Default Re: ECU replacement

Quote:
Originally Posted by UrdnotWrexSTi View Post
Hmmm so the first ECU was your original unit that got tuned on pump gas and the second ECU was a used unit that had another VIN programmed to it or was it new?
Correct. my OEM ECU had the pump gas tune

the 2nd ECU was a junkyard ECU that I picked up used. I just took it to the GM dealership, along with the car, and said I needed this ECU installed.

They told me it might not work blah blah. Even though it was the same ECU/part number from an identical car (08 Cobalt SS turbo)

it worked fine. I then had that ECU tuned on E85. and just swapped them when I needed.
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Old 09-09-19, 07:21 PM   #9
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Default Re: ECU replacement

So nevermind on the AP connecting... Looks like the AP is powering on but it doesn't connect to the ECU. I can't read codes and unmarrying it doesn't work, it just keeps saying "attempting to connect"... God damnit it, I was 99% done with this build and now this stupid little mistake will take me back at least another $1000 and a good week or two of downtime... Damn it. God, I hope COBB doesn't fuck me over.
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