Electrical Systems
7.22
MFI Troubleshooting
If the MFI is not working check the following items:
S Battery connections for corrosion;
S Fuse inside electrical box;
S Pins in MFD / MFI connector for corrosion or loose fit;
S Power and ground at the connector to the MFD / MFI;
S Component inputs are functioning properly.
Following are some of the common symptoms of a malfunctioning MFD / MFI and possible causes:
Display is stuck on one function / display shows all 8s / buttons don’t wor k...
Although uncommon, this malfunction may occur after the battery has been removed from the craft or when the
power is disconnected. It may freeze on any one function, or with all “8s” displayed, as if the MFD / MFI is perform-
ing it’s self-check during power up. It is possible that when the battery negative cable is re-connected after ser-
vice, power glitches may cause the micro-processor to temporarily malfunction. This has no damaging or perma-
nent affect on the MFD / MFI, and can be corrected by disconnecting the negative battery cable for approximately
1 minute to reset the microprocessor .
When reconnecting the battery negative cable, take care to make it as “clean” a connection as possible. Only
contact the battery terminal once
while connecting the cable. Do not contact the terminal repeatedly. Hold pres-
sure on the cable until the terminal bolt is tight.
CAUTION:
To avoid the possibility of explosion, always disconnect the negative cable first and connect it last.
One part of display malfunctions...
Determine which function (or functions) are not working. If only one or two parts of the display are affected,
chances are the input for that function is the problem. Test individual senders and inputs including related wiring.
Refer to the electrical wiring diagram. Check for clean, tight connections at the back of the gauge and inside the
electrical box. If water is present in the electrical box, be sure the wire sealing grommets and box sealing O-ring
are properly positioned. Route wires carefully when assembling the box to prevent pinched wires. On new units,
make sure the wires are located correctly in the connector clip by comparing wire color to the key on the schematic
wiring diagram.
Interm ittent malfunctions...
Be sure to get an accurate description of the problem from the customer if a malfunction is intermittent. Intermit-
tent malfunctions are usually traced to a loose connection on the sender or signal wire power supply or ground
path. If the display is completely dead concentrate on the power supply to the display and the ground wire from
it. Disconnect the coupler from the back of the display unit and check for battery voltage on the Red/Purple wire.
If no power is present test the black wire for good continuity to ground. If the ground path is complete check the
1/4 amp fuse in the electrical box. Be sure to check for power across the fuse terminals even if it appears to be
good. In some cases the fuse will have good continuity but will not pass current.
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