DIAGNOSTIC SERVICES — Diagnostic Session Control

The different categories of services are

• Diagnostic and Communication Management functional unit
• Data Transmission functional unit
• Stored Data Transmission functional unit
• InputOutput Control functional unit
• Routine functional unit
• Upload Download functional unit
• Non-volatile server memory programming process

Do NOT be intimidated by the sophisticated list. You will only see that it’s very simple as and when we go through each of these in detail.

Let us start with Diagnostic and Communication Management functional unit

DIAGNOSTIC SESSION CONTROL

As the name suggests, this service is used to enable different sessions in the server/ECU. The ECU would be designed in such a way that certain diagnostic services can be accessed only in certain sessions and would be disabled for all other sessions.

Important points to know about Diagnostic Session control

• There will always be one…