This document provides instructions for changing a non-programmed E-ECU (engine control unit) on an engine with MID 128. The steps include: placing the machine in service position 1, connecting the VCADS Pro programming tool, turning off voltage, removing covers, disconnecting connectors and hoses from the old E-ECU, replacing the E-ECU, reconnecting connectors and hoses, and finishing installation. Reprogramming the new E-ECU is also required using the VCADS Pro tool and operation 28423-3.