Fitting a Mitsubishi ECU The following steps outline the installation procedure: 1. Remove the factory ECU from the vehicle: Ensure the key is in the OFF position. The factory ECU is located on the left A pillar about 30cm above the floor. Unplug the wiring harness from the factory ECU. Remove the 6mm bolts (10mm socket) that retain the ECU and remove the ECU from the vehicle. DO NOT touch the exposed pins in the factory ECU connector. 2. Remove the factory ECUs circuit board from its enclosure: Ensure you are following the given anti-static guidelines and ARE WEARING A CONDUCTIVE WRIST STRAP connected to a conductive working surface. Using four small flat bladed screwdrivers, carefully pry apart the four plastic lugs retaining the ECUs header plate into the case. Some force may be required to remove the circuit board from the case as it may be partially glued to the inside. Remove the circuit board by removing the retaining screws. Hold it only by the plastic header and place it aside. 3. Connect the ECU USB tuning cable and the expansion loom if required. 4. Fit the Vi-PEC Plug-In ECU, there are several options depending on the vehicle: 

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