Theory Of Operation
WARNING: This page is about a different variant/trim than selected.
After the controller is reset (ignition on from an off 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 memory. If the integrity of the program memory fails, the MIL will illuminate after 10 seconds of vehicle operation and transmission will be placed in limp-in.