Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
The vehicle uses an immobilizer key, without the key being detected it will disable the fuel and ignition when you try to start it.There is no realistic way to remove this feature... the only ways around it is more expensive and more involved than just replacing the key.I take it you do not have a spare key perhaps with a family member etc?
It looks like we missed each other; if you do not have access to any other key, you are not going to be able to get the engine started unfortunately.
If you want to bypass the immobilizer you have three options:
1) Get another key, have it programmed to the car, then store the key (or its chip is all you need) inside the steering column so that the correct key signal is detected.
2) Get a RF simulator (most alarm shops will be able to order one of these), mount it in the steering column, then have it programmed (just as you would a key) so that the key signal is detected.
3) Find someone that is extremely familiar with assembly code used in these PCMs, use a tactrix cable and ecuflash or similar software to dump the image file from the PCM and manually disable the immobilizer. While this is something that is done semi-frequently on some Mitsubishis, to date I am not aware of anyone that has been able to decode the Eclipse PCM, at least as far as to be able to modify the immobilizer code.Your realistic solution is to just get a key and have it programmed. The keys are around $50 typically depending on your dealer, or you can order aftermarket ones from Ebay for usually in the $10-15 range and are usually just fine to use. Then a tow to a dealership or well equipped lock smith to have the key programmed.