Stable power is necessary to prevent intermittent engine stalling or communication loss with diagnostic scan tools.
Many Mitsubishi commercial ECUs utilize an "ECU Self-Inertia" or Main Relay system. mitsubishi 4m51 ecu pinout work
Pin 22 (Positive) and Pin 7 (Negative). Camshaft Position: Pin 14 (Signal). Rail Pressure Sensor: Pin 39 (Supply) and Pin 8 (Ground). Coolant Temperature (CTS): Pin 55. Boost Pressure: Pin 25 (Signal) and Pin 13 (Supply). Actuators and Control: Stable power is necessary to prevent intermittent engine