The primary purpose of the FICM is to generate the 48 volt signal to operate the engine's fuel injectors. As the FICM starts to fail, this output voltage begins to drop. Before condemning the FICM, it is critical to ensure that it has sufficient supply voltage from the vehicle - low voltage in equals low voltage out! Begin by ensuring that the vehicle's batteries are in good condition and fully charged and that all connections to the batteries are clean and tight. The following information is a summary of the steps necessary for FICM diagnosis - for complete procedures including safety precautions please consult your vehicle's service manual. We guarantee our parts to be as described by part number, picture, and verbiage. While we do our best, vehicle applications, however, simply cannot.
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