SFI SYSTEM > DEFINITION OF TERMS

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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 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 the 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.