Often uses "PV High" and "PV Low" terminology for each cylinder to drive solenoid-based injectors.
: Use a multimeter to verify 5V reference signals going to sensors like the Accelerator Position Sensor. mitsubishi 4m51 ecu pinout top
The most critical part of this specific ECU was the fuel injection pump control. The 4M51 used an electronic rotary pump, and the pins governing the spill valve were the most sensitive. One wrong surge of voltage and the expensive pump would be nothing more than a paperweight. Often uses "PV High" and "PV Low" terminology