Definition Of Terms

Terms	Definition
Monitor Description	Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and details).
Related DTCs	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 stores a DTC when monitored values exceed the malfunction thresholds.
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 the previous detection operation is completed.
Required Sensor/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 the ECM only performs checks for that malfunction once during a single driving cycle. "Continuous" means the ECM performs checks for that malfunction whenever the enabling conditions are met.
Duration	Minimum time for which the ECM must detect a continuous deviation in monitored values in order to store a DTC. Timing begins when the Typical Enabling Conditions are met.
Malfunction Thresholds	Beyond this value, the ECM will conclude that there is a malfunction and store a DTC.
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 cycles" means the ECM illuminates the MIL if the same malfunction is detected a second time during the next sequential driving cycle.