System Status & Drive Cycle For Satisfying Federal Inspection/Maintenance (I/M 240) Regulations
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.
I/M Ready Status means a signal or flag for each emission system test that had been set in PCM. I/M Ready Status indicates that vehicle on-board emissions diagnostics have been run. I/M Ready Status is not concerned whether emission system passed or failed test, only that on-board diagnosis is complete. Not all vehicles use all possible I/M flags.