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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 431 (Powertrain Control Module (Pcm) - Electrical Diagnostics - 68RFE Automatic Transmission - 2500 Hd & 3500) >> Diagnosis And Testing >> P0605-Internal Control Module ROM >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

After the controller is reset (ignition turned to the RUN position) the microprocessor checks the integrity of the program memory (ROM). A checksum is calculated by adding all used bytes in the program memory. The sum should be the same as a known constant stored in the program memory.

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