Self-Diagnostic System: OBD-II: Notes
WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 2003 Jaguar XKR, 2003 Jaguar XK8, 2003 Jaguar XJR, 2003 Jaguar XJ8, and 2002 Jaguar XKR. However, it is still accessible from the selected car via links, so may be relevant.
The ECM monitors system operation using inputs from various sensors and stores Diagnostic Trouble Codes (DTCs) to aid in fault diagnosis. System requires either one or two drive cycles before a DTC is stored. With the exception of catalyst efficiency, all inputs and outputs will have been checked by the end of an appropriate drive cycle. The catalyst monitoring test requires 3 drive cycles, which include a period of steady driving.