Electrical Systems
7.23
MFD / MFI T r oubleshooting -- Continued
Blowing fuses
...
Power surges or spikes are the most common cause of blown fuses. These power surges can be caused by
loose connections in the electrical box, poor ground at the engine mount plate, and even corroded or loose battery
terminals (not necessarily visible to the naked eye). Any time the battery charging path is interrupted there is a
potential for a voltage “spike”. Concentrate your effort there for blown fuses.
In order to display accurate information, the MFD / MFI must receive accurate data. This data may be in the form
of a variable ground path such as the fuel and oil level senders, a pressure input such as the speedometer pitot
tube, or a specific voltage signal like the alternator input for RPM.
Speedom eter reading inaccurate...
The MFD / MFI electronically converts a pressure input from the pitot tube (located in the pump inlet area) to a
graphic display of MPH or (KPH). Inaccurate reading can be caused by kinks or obstructions in the pressure line
or pitot tube, cavitation of the pump, or wrong operating RPM.
In some cases, an improperly functioning display may be corrected by disconnecting the battery for two hours.
If all items above have been checked and verified, it may be necessary to replace the MFD / MFI.
Speedometer Pressure Test Results
PSI* Genesis Virage
30 57.0 52.7
35 61.6 57.0
40 65.8 60.9
45 69.8 64.6
50 73.6 68.1
* Engine must be running to test speedometer under 30 MPH. Test at or above 30 psi.
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