Diagnostic Executive: Notes
WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.
OBD-II data streams are prioritized. When 2 messages attempt to establish communications on a data line at the same time, only the message with higher priority will continue. A new segment of the software called the Diagnostic Executive coordinates the protocol for recording and displaying diagnostic procedures.
Diagnostic Executive is a unique segment of software which is designed to coordinate and prioritize diagnostic procedures as well as define protocol for recording and displaying their results. The main responsibilities of the Diagnostic Executive are as follows:
- Commanding MIL ("Check Engine" lamp) on and off.
- DTC logging and clearing.
- Freeze Frame data for the first emission related DTC recorded.
- Non-emission related service lamp.
- Operating conditions Failure Records buffer, (the number of records will vary).
- Current status information on each diagnostic.
- System status (I/M ready).