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Home >> Jeep >> 2009 >> Commander Sport, 3.7 K, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 ((Powertrain Control Module (Pcm) - Electrical Diagnostics - 545RFE Automatic Transmission)) >> DTC Troubleshooting >> P0605-Internal Control Module ROM >> Theory Of Operation

Theory Of Operation

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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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