Finding the correct pinout for a Bosch ECU depends entirely on identifying your specific (usually an 10-digit number like 0 281 XXX XXX for EDC units or 0 261 XXX XXX for ME/MED units) and the vehicle it belongs to. Essential Resources for Bosch Pinouts
To understand the "best" datasheet, one must first understand each element of the query: bosch ecu pinout datasheet best
Given that Bosch rarely releases public pinouts (to protect intellectual property and dealership service revenue), the best sources are: Finding the correct pinout for a Bosch ECU
Bosch ECUs have evolved significantly. The pinout strategy changes drastically between generations. bosch ecu pinout datasheet best