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05 ECU into 03 Evo VIII shell

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Old Mar 6, 2008 | 03:10 PM
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tseitz123's Avatar
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05 ECU into 03 Evo VIII shell

Here is my situation:

I recently totaled my 05 Evo VIII and have since bought an 03 Evo VIII shell to which I will be transplanting my crashed Evo VIII into. Now, the 03 Evo has NO drive-train at all to speak of (engine, tranny, t-case, diff, etc.), although it DOES have the engine bay wiring harness. It does NOT have the 03 ECU. Now, it has been difficult getting to the bottom of this question, but I apparently CAN use my 05 ECU as long as i also swap the immobilizer ECU. The 03 has the original ignition wiring and harness, including the key, however, I can swap the 05 ignition and key into it if that is also necessary. I need input and any help, so as to avoid any potential nightmares. Thanks in advance!
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Old Mar 6, 2008 | 03:14 PM
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From: Dirty Jerz
what woudl happen if you flash a stock 03 rom into it
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Old Mar 6, 2008 | 03:57 PM
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I have no idea, but i think that it'll work as long as i either disable the immobilizer OR swap the 05 immobilizer and ignition/key into the 03
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Old Mar 6, 2008 | 04:01 PM
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As long as you swap everything over you will be fine i believe
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Old Mar 6, 2008 | 04:11 PM
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I have an 03 with an 04 ecu..swap over or disable immob code.
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Old Mar 6, 2008 | 04:12 PM
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An 03 rom will not work in a 05 ecu.

You will need the code from the 03 immobilizer and program it into the 05 ecu.
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Old Mar 6, 2008 | 04:12 PM
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What about disabling it entirely? I read that if I change my immobilizer code in my ECU to HEX 0xFFFF, it will effectively disable it, letting me use the 03 key, etc. Thoughts?
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Old Mar 13, 2008 | 10:49 AM
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From: Dirty Jerz
give it a try and maybe you can be the first to answer these questions for others.
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