The MS3Pro ECU’s feature user-replaceable fuses that protect against voltage spikes and other abuse. To replace these fuses, use a needle nose pliers to pull the fuse out of its holder, and then push in the replacement fuse by hand.
These 500mA fuses are used in the first-generation MS3Pro in the F1 and F2 locations.
The MS3Pro EVO uses this fuse in the F4 location.
Fuses sold individually.
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Where are the fuses located on the MS3-Pro?
- They are on the top side of the board, near the white connector.
How far do I have to disassemble the MS3-Pro to replace the fuses?
- You will need to disassemble the case and remove the PCB.
What tools are needed to replace the fuse(s)?
- Only a #2 phillips bit screwdriver with a good tip.
Why did the fuse blow, anyway?
- The most likely causes are short circuits on the VREF or stepper IAC control wires.