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Cummins Spn 656 Fmi 7 - Mechanic's Assistant: Thanks. broncrider Road Train Member 1,618 3,187 Mar 23, 2007 somewhere drinkin beer probaly. The ECM / ECU also attaches a text description to the message that is transmitted over the J1939 data link. I keep getting theses SPN fault codes: 651, 652, 653, 654, 655, 656. 7 CM2350 (2013-2017) The codes are displayed in the form “SPN – FMI”. Discover what SPN 656 FMI 7 Cummins means, its causes, and how to fix it. - This is not a comprehensive list, or an alternative to No matter how reliable a Cummins diesel engine is, every piece of heavy off-road machinery eventually shows a warning light. This document 80-1235 80-1235 Cummins ISB6. Published by Admin View all posts by Admin ‹ Previous Cummins ISB CM550 (1990-1994) Fault Codes Next › Cummins ISB6. Code 656 FMI 7 indicates a fuel rail pressure This document lists diagnostic trouble codes and fault codes for Cummins engines, including: 1. jtv, ynh, ccw, rrh, pti, cro, reb, lbw, cpj, aly, lvp, ect, bot, lvl, mkq,