Где взять описания CAN-протоколов для разных марок?..

GASCHE

Смотрим ISO 15765-4 First edition 2005-01-15

6.3.2.2 11 bit CAN identifiers
Table 3 specifies the 11 bit CAN identifiers for legislated OBD, based on the defined mapping of the
diagnostic addresses.

Table 3 — 11 bit legislated-OBD CAN identifiers
CAN identifier Description
(hex)
7DF CAN identifier for functionally addressed request messages sent by external test equipment
7E0 Physical request CAN identifier from external test equipment to ECU #1
7E8 Physical response CAN identifier from ECU #1 to external test equipment
7E1 Physical request CAN identifier from external test equipment to ECU #2
7E9 Physical response CAN identifier from ECU #2 to external test equipment
7E2 Physical request CAN identifier from external test equipment to ECU #3
7EA Physical response CAN identifier from ECU #3 to external test equipment
7E3 Physical request CAN identifier from external test equipment to ECU #4
7EB Physical response CAN identifier ECU #4 to the external test equipment
7E4 Physical request CAN identifier from external test equipment to ECU #5
7EC Physical response CAN identifier from ECU #5 to external test equipment
7E5 Physical request CAN identifier from external test equipment to ECU #6
7ED Physical response CAN identifier from ECU #6 to external test equipment
7E6 Physical request CAN identifier from external test equipment to ECU #7
7EE Physical response CAN identifier from ECU #7 to external test equipment
7E7 Physical request CAN identifier from external test equipment to ECU #8
7EF Physical response CAN identifier from ECU #8 to external test equipment
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While not required for current implementations, it is strongly recommended (and may be required by applicable
legislation) that for future implementations the following 11-bit CAN identifier assignments be used:
7E0/7E8 for ECM (engine control module);
7E1/7E9 for TCM (transmission control module).
Заметьте что читал не где-то. Поэтому думаю вопрос
вы должны задать в первую очередь себе