What Should My Ficm Voltage Be. The default stock voltage output for the 60L FICM is 48 volts. FMP is the amplified voltage - 47 to 48 is normal.
You should have a minimum of 45 volts to be within specification with the ignition key in the RUN position cranking and engine running. The voltage should be right at 48 volts. At 10v it could easily be 44v and that would be OK.
Anything between 47 and 49 is good.
Check the FICM Output Voltage. Once your glow-plugs kick off and the alternator kicks in up to 2 minutes after KOEO the voltage should be about 14v and the FICM voltage should be stable at 47v. 4-Screw FICM as viewed from the front of the truck. If you can detect a high side fault for the eight injectors your FICM needs to be replaced.
