The high voltage allows for much faster and accurate opening of the injector. The standard 12 volts would be insufficient in opening the pintle in the injector under these pressures, so the IDM increases the voltage to 115 volts. The primary function of the IDM is to boost the DC (direct current) signal sufficiently to operate the fuel injector under such loads. The 7.3 Power Stroke uses a PCM (powertrain control module) in conjunction with the IDM ( injector driver module) to operate the engine. The 7.3 is a direct-injection fuel injection where the fuel is injected directly into the extreme pressures of the cylinder, thus the reason for the high fuel pressure to overcome these pressures. This engine relies on extremely high oil pressure to build fuel pressure within the fuel injector. The collaborative efforts of Caterpillar and International introduced electronic fuel injection to the 7.3 Power Stroke.
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