Diamante, Eclipse, GALANT, Montero & Montero Sport: Introduction
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Mitsubishi Outlander, 2003 Mitsubishi Montero Sport, 2003 Mitsubishi Montero, 2003 Mitsubishi Lancer, and 2003 Mitsubishi Galant. However, it is still accessible from the selected car via links, so may be relevant.
When replacing the PCM, it will be necessary to reregister all ignition keys with the immobilizer-ECU. See KEY ID REGISTRATION (USING MUT-II SCAN TOOL) or KEY ID REGISTRATION (USING MUT-III SCAN TOOL) . Since Lancer and Outlander are not equipped with the immobilizer-ECU, the ignition key registration does not apply to them.