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First off, 1989 is not an OBD 2 system.
Second Mitsubishi did not support flash programming till the early 2000s in some models, later in others. That is a vague statement but I did not feel like looking up the details.
But basically non Canbus ECUs are generally non flash.

Flash programming is where we can reprogram the lookup tables such as mixture and timing in the computers.


You can reflash any Mitsu ecu as long as its eprom and you can read the code. People have been doing it for years on DSM/3000gt/evos.

92 Galant vr4 11.17at132mph
98 Montero 2.5"lift,33/10.50/15,15x8procomp wheels.
trail-gear rock sliders,ARB front bumper,Warn m8000 winch. Piaa lights.