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Service engine warning-

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How do you know if it is a critical issue? Only a power issue code showed on screen “current below normal or open circuit “ SPN:3256 FMI:5.  All other stuff looked good, temp, pressure and power.  I was running battery 2 and #1 got to 11.1 volts.  
# are engine codes only by a special reader at dealer?? 2016 mxz22

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You can use a diagnostic manual to see what a fault code means, possible causes, and repair procedures.  This is a manual for a very similar Indmar ECM, but your engine is likely covered in the version 1.3 manual.


Check out page 55.

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