Definition Of Terms

DEFINITION OF TERMS

Terms	Definition
Monitor Description	Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
Related DTCs	A group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection logic.
Typical Enabling Condition	Preconditions that allow the ECM to detect malfunctions. With all preconditions satisfied, the ECM sets DTCs when monitored value(s) exceeds 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, when previous detection operation has completed.
Required Sensor/Components	The sensors and components used by the ECM to detect each malfunction.
Frequency of Operation	The number of times the ECM checks for each malfunction during each driving cycle. "Once per driving cycle" means ECM only performs checks for that malfunction once during a single driving cycle. "Continuous" means the ECM performs checks for that malfunction whenever enabling conditions are met.
Duration	Minimum time for which the ECM must detect a continuous deviation in monitored value(s) in order to set a DTC. Timing begins when Typical Enabling Conditions met.
Malfunction Thresholds	The value beyond which the ECM determines malfunctions exist and sets DTCs.
MIL Operation	Timing of MIL illumination after a malfunction is detected. "Immediate" means the ECM illuminates the MIL as soon as a malfunction is detected. "2 driving cycle" means the ECM illuminates the MIL if the same malfunction is detected a second time during the next sequential driving cycle.