: The "CI" suffix often stands for "Calibration Information" or is part of a naming convention for specific engine families (like the QSK23 or Tier 4 Interim engines).
October 2023 ECM Calibration Updates | PDF | Engines - Scribd sc23204-CI.rar
The filename typically refers to a compressed archive containing Cummins ECM Calibration files (Incal files) . These files are used by automotive technicians to update or reprogram Engine Control Modules (ECM) for Cummins engines. Common Context : The "CI" suffix often stands for "Calibration