The diagnostic modes/services are described in the ISO and SAE standards: In this article, we are going to focus on the diagnostic modes/services defined for the CAN protocol. The communication protocol and the content of the diagnostic data is define in the Application Layer (OSI Level 7). The communication between the scantool (diagnostic equipment) and the vehicle is defined in the OBD related standards.
The vast majority of vehicles in use nowdays are OBD compliant, which means that they have on-board monitoring functions for the systems and components whose functionality has an impact on exhaust gas toxic emissions levels.įor an overall understanding of OBD read the article Introduction to On-Board Diagnostics (OBD).
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