INJ-238 GM AFM Fuel Management Operations

Teacher ImageOnline $50 ValueWebinars only

With the ever-increasing competition in the truck market, GM introduced again its Displacement on Demand system now termed the AFM or Active Fuel Management System. This included a unique system to shut off 4 cylinders under light loads. Learn in detail how the AFM operates and more importantly diagnostics of this engine management system. YES, MORE HIDDEN OIL FILTERS! CAREFUL ON USED ENGINE Replacements If you want to keep the MIL off.


  1. Introduction
  2. Base Engine Features, 4.8l, 5.3l, 6.0l, and 6.2L
  3. Base Mechanical Issues & Repairs
  4. Variable Valve Timing Operations & Diagnostics
  5. Active Fuel Management Operation
  6. AFM (DOD) Diagnostics
  7. AFM (DOD) Repairs and Mods
  8. Used Engine Swap Cautions

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Injectronics Training
50 McAuley Road Clandeboye, Manitoba R0C0P0
Phone: +1 (204) 228-8060