System Diagnostics: Notes

WARNING: This page is about a different car, the 2006 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.

Fault detection is through active and stored Diagnostic Trouble Codes (DTCs)

DTCs are displayed by the DRBIII®.
Active DTCs are those which currently exist in the system. The condition causing the fault must be repaired in order to clear this type of DTC.
Stored DTCs are those which occurred in the system since the ATC Module received the last "clear diagnostic info" message.