2. CAL Files and DIDs (Parameters)

2.1 CAL Files

- CAL Files are sets of calibrations or adjustments stored in a single file, often in FLASH memory.

- They are primarily used in Powertrain ECUs to fine-tune performance parameters.

2.2 DIDs - Diagnostic Identifiers

- DIDs are parameters or adjustments stored in FLASH or NVRAM, accessible via ISO 14229 (UDS).

- DIDs are frequently used to configure an ECU with specific options, typically at End-of-Line (EOL) stages.