As vehicles continue to get more complex, technicians often specialize in certain areas of repair to be more proficient, If their specialty is an isolated system, then this is an efficient manner in which to repair a vehicle. Today, systems like air conditioning are interrelated with the PCM, the cluster, and the body computer. (Sometime more than one) This makes it more difficult to repair the vehicle with only understanding 1 system. Such is the case with electronic transfer case and 4x4 systems. Ford uses the GEM even in Mechanical Shift on the Fly. With Electronic Shift on the Fly and Automatic transfer cases, the GEM is even more involved. Should the driveline specialist fix the vehicle, or the electronics specialist….. you! 

This course will cover 4x4 transfer case operations, and the GEM’s involvement in providing efficient 4x4 operations. We will primarily deal with 97 and newer pickups and sport utility vehicles. Mechanical Shift On the fly, Electronic Shift on the fly and Automatic 4 Wheel Drive systems will all be taught in class. A working 99 F150 Electronic Shift on the Fly system will be used in class to demonstrate operations and perform some hands on.

COURSE OUTLINE

1. Ford 4x4 System Types & Applications
2. Basic Multiplexing and Its Involvement In 4x4 Controls       
3. System Application
4. Mechanical Shift On the Fly 
   • Basic Power Flow
   • Inputs to GEM
   • GEM Outputs
   • Diagnostics
5. Electronic Shift On the Fly
   • GEM Inputs
   • GEM Outputs
   • Diagnostics 
6. Automatic 4 Wheel Drive
   • Power Flow
   • GEM Inputs
   • GEM Outputs
   • Diagnostics

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