Definition Of Terms
DEFINITION OF TERMS CHART
| Terms | Definitions |
|---|---|
| Monitor | Description of what ECM monitors and how to detect malfunctions (monitoring purpose and details) |
| Related DTCs | A group of diagnostic trouble codes that are output by ECM based on the same malfunction detection logic. |
| Typical Enabling Conditions | Preconditions that allow ECM to detect malfunction. With all preconditions satisfied, ECM sets DTC when monitored value(s) exceeds malfunction threshold(s) |
| Sequence of Operation | Order of monitor priority, applied if multiple sensors and components involved in single malfunction detection process. |
| Sequence of Operation | Each sensor and component monitored in turn and not monitored until previous detection operation is completed. |
| Required Sensors/Components | Sensors and components used by ECM to detect each malfunction. |
| Frequency of Operation | Number of times ECM checks for each malfunction during each driving cycle. |
| Frequency of Operation | "Once per driving cycle" means ECM only performs checks for that malfunction once during single driving cycle. |
| Frequency of Operation | "Continuous" means ECM performs checks for that malfunction whenever enabling conditions are met. |
| Duration | Minimum time for which ECM must detect continuous deviation in monitored value(s) in order to set DTC. Timing begins when typical enabling conditions are met. |
| Malfunction Thresholds | Values, beyond which, ECM determines malfunctions exist and sets DTCs. |
| MIL Operation | Timing of MIL illumination after defect is detected. |
| MIL Operation | "Immediate" means ECM illuminates MIL as soon as malfunction is detected. |
| MIL Operation | "2 driving cycles" means ECM illuminates MIL if the same malfunction is detected twice during the next sequential driving cycle. |