SENR9977 25 Systems Operation Section Voltage Load-dump Protection Module (VLPM) g01133354 Illustration 31 (1) VLPM The VLPM monitors the voltage of the system and the VLPM will protect the ECU on the fuel injection pump against voltage spikes and reverse polarity. The fuel injection pump will be shutdown if there is high voltage on the system. i02251435 Power Sources Introduction (Power Supplies) The 1104C electronic engine has four supplies to the following components: ECM Fuel Injection Pump Pressure sensors Throttle position sensor