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No lights on but code 1633 comes up so it won't pass inspection

(2003 Ford Taurus)
in Lodi, NY on March 09, 2015
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The definition to this code is - Keep alive power to the PCM (Powertrain Control Module) has been interrupted. First thing to do would be check all the fuses,(It is common for the fuse for A/C compressor to be bad because of a faulty compressor, this fuse is shared by the PCM.) if all are ok then you would have to check your powers and grounds to the PCM, if all that is ok most likely cause would be a internal faulty PCM. If replaced would need to be programmed
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