The unique injection system of a powerstroke engine requires that the diesel fuel injectors obtain the proper voltage supply from a driver. This is where the injector control moduleor injector driver module comes into play.
The IDM or ICM is responsible for sending the electrical current to the solenoids, which means that its basic purpose is to simply convert voltage. Together with the powertrain control module, the two components operate the fuel injection system by managing how much fuel is sent to the engine and letting the fuel injectors know when to fire.
It is of vital importance that the voltage sent to the solenoids from the ICM or IDM is correct or drivability problems ensue. A variety of things, such as corrosion, can cause problems with the driver and even result in costly repairs that are not necessary. However, a ICM or IDM that has failed or is faulty can cause the vehicle to not start at all or just stall.
Checking the voltage output lets a mechanic easily know if there is a problem with the driver.