Definition Of Terms [09/2015 - 08/2019]

Term	Definition
Monitor Description	Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and details).
Related DTCs	A group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection logic.
Typical Enabling Conditions	Preconditions that allow the ECM to detect malfunctions. With all preconditions satisfied, the ECM stores a DTC when the monitored value(s) exceeds the malfunction threshold(s).
Sequence of Operation	Order of monitor priority, applied if multiple sensors and components are involved in a single malfunction detection process. Each sensor and component is monitored in turn and subsequent items are not monitored until the previous detection operation completes.
Required Sensors/Components	Sensors and components used by the ECM to detect each malfunction.
Frequency of Operation	Number of times the ECM checks for each malfunction during each driving cycle. "Once per driving cycle" means that the ECM only checks for malfunctions once during a single driving cycle. "Continuous" means that the ECM checks for malfunctions whenever enabling conditions are met.
Duration	Minimum time for which the ECM must detect continuous deviation in monitored value(s) in order to store a DTC. Timing begins when typical enabling conditions are met.
Typical Malfunction Thresholds	Value beyond which the ECM will determine that there is a malfunction and stores a DTC.
MIL Operation	Timing of MIL illumination after a malfunction is detected. "Immediate" means that the ECM illuminates the MIL as soon as a malfunction is detected. "2 driving cycles" means that the ECM illuminates the MIL if the same malfunction is detected again during the next driving cycle.