2003 Polaris Freedom, Virage and Genesis PWC Service Manual, Page 235Get this manual
Electrical Systems MFDMFI TroubleshootingContinued Blowing Fuses
Power surges or spikes are the most common cause of blown fusesThese 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 potential for voltage "spike"Concentrate your effort there for blown fusesIn order to display accurate information, the MFDMFI must receive accurate dataThis data may be in the form of variable ground path such as the fuel and oil level senders, pressure input such as the speedometer pitot tube, or specific voltage signal like the alternator input for RPM
Speedometer Reading
The MFDMFI electronically converts pressure input from the pitot tube (located in the pump inlet area) to 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 RPMIn some cases, an improperly functioning display may be corrected by disconnecting the battery for two hoursIf all items above have been checked and verified, it may be necessary to replace the MFDMFI