The injector driver module (IDM) applies 115volts DC to all of the fuel injectors on the 7.3L DIT diesel engine. The IDM receives signals from the PCM for cylinder identification and fuel delivery command. The PCM controls when the timing of the injectors should start and how long the injector is open. The IDM controls the injector firing sequence through output drivers. The IDM has an output driver for each injector: one low side driver for each injector and one high side injector for each bank of injectors. The injector is fired when the output driver closes the circuit to ground.