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Fault Memory (DTC Viewer)

ECU contains a dedicated memory area for storing Diagnostic Trouble Codes (DTCs) and related fault records.
All detected abnormal events (e.g., sensor open circuits, signal anomalies, ECU self-test errors) are logged in this fault memory for use by after-sales, testing, and development teams.

‌Operation‌:
Click Diagnostics -> Fault Memory
Fault
Fault​

Tester Present On/Off (Session Keep-Alive Mechanism)​

  • ‌Function‌:
    The Tester Present service (0x3E) maintains active diagnostic sessions and prevents timeout. ECUs in extended/programming sessions (e.g., 0x03, 0x02) will automatically revert to the default session and terminate high-privilege operations if no diagnostic requests are received within a timeout period (e.g., 5000ms or 10000ms).
    Present

Update Fault Memory List (0x19 Service)​

  • ‌Function‌:
    Forces the ECU to re-execute current fault snapshot detection, update DTC statuses, and refresh the internal fault list.
    Present
    ‌Result‌:
    DTCs will populate the table.
    Present

Activate Cyclic Update (0x19 Service)​

  • ‌Function‌:
    Scheduled to repeatedly execute and send service 19, and refresh the internal fault list. Present
    ‌Result‌:
    DTCs will populate the table.
    Present

Delete DTC (0x14 Service)​

  • ‌Function‌:
    Clears specified DTC records stored in the ECU. When an anomaly is detected (e.g., sensor disconnection, signal error), the ECU records it as a DTC in the fault memory.
    Present
    ‌Operation‌:
    Select a DTC and click Delete to remove it from the ECU.

Delete All Fault Memory Entries​

  • ‌Function‌:
    Clears ‌all‌ DTC records in the ECU, resetting the fault memory to its initial state.
    Present

Activate DTC Logging​

  • ‌Function‌:
    Saves DTC records to a local file. Default log path: ETStudio installation directory. Custom paths can be configured via the Properties page.
    Present

Properties Configuration Page​

Present
Present

General Tab​

  • ‌Update Fault Memory Interval‌:
    Default: 5 seconds. Configures the cyclic update interval for Section 5.3.
  • Present
  • ‌Log File Path‌:
    Modify the DTC log storage path (see Section 5.6).

Message Tab​

  • ‌PDU Configuration‌:
    View or modify Protocol Data Units (PDUs) containing protocol control information for specific services.
    • Present
      ‌Operation‌:
      Click items in the left menu to edit or view PDUs for corresponding services.