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Here is a post show how to use WinOLS to correct checksum for Opel Motronic 1.5.5.For this guide I’ll use the HW 0261206102 file, but all of them look the same.
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In Motronic M1.5.5 there are 2 banks of repeated data.
First bank goes from 0000h to FFFFh.
Second bank goes from 10000h to 1FFFFh.
There are 2 checksums (one for each bank) located at FFF8h and 1FFF8h.
Both checksums are 16bit sums followed by their complement.
You can find this going to the end of each bank and finding the both 16bit numbers that
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