Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
I apologize for the delay.Unfortunately there is no over ride available for this vehicle. The immobilizer over ride was never available for the final generation Galant, 2003 was the last year it had this option.
The immobilizer over ride was phased out in 2003-2004, and the Galant was one of the models that ended in 2003.If you are having an issue like you describe with the green key silhouette light coming on, unless you have access to a second key to try (the keys failing/skewing their signal is the primary problem on these cars) you will need to get the vehicle towed to a dealer for for reprogramming. Unfortunately there is no way around this on this model/year.
By design when there is a immobilizer mismatch it will ground the fuel injector drivers to prevent fuel pulse. However if the vehicle is continually attempted to be started it will shut down the ignition drivers killing the spark as well.
The only other thing that will kill spark and injector pulse while the PCM is otherwise operating normally is the crank sensor... you could check the crank sensor operation manually or via scan tool to rule it out, however if the crank sensor were at fault the immobilizer light would not be turning on. It only comes on when there is a malfunction in the system.