The 4M51 ECU employs a dual-power architecture:
If you suspect the ECU itself is faulty (leaking capacitors), you can bench-test it using the pinout. mitsubishi 4m51 ecu pinout work
Ensure the ignition switch is fully off and the battery is isolated before sliding the locking harness levers off the computer. Unplugging the ECU while live can yield high-voltage spikes that damage sensitive microchips. The 4M51 ECU employs a dual-power architecture: If
Pins dedicated to battery and ignition-switched power. mitsubishi 4m51 ecu pinout work