Definition Of Terms

Term

Definition

Monitor description

Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).

Related DTCs

Diagnostic code

Typical enabling condition

Preconditions that allow the ECM to detect malfunctions.

With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction threshold(s).

Sequence of operation

The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunction.

While another sensor is being monitored, the next sensor or component will not be monitored until the previous monitoring has concluded.

Required sensor/components

The sensors and components that are used by the ECM to detect malfunctions.

Frequency of operation

The number of times that the ECM checks for malfunctions per driving cycle.

"Once per driving cycle" means that the ECM detects malfunction only one time during a single driving cycle. "Continuous" means that the ECM detects malfunction every time when enabling condition is met during a single driving cycle.

Duration

The minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a DTC. This timing begins after the "typical enabling conditions" are met.

Malfunction thresholds

Beyond this value, the ECM will conclude that there is a malfunction and set a DTC.

MIL operation

MIL illumination timing after a defect is detected.

"Immediately" means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction. "2 driving cycle" means that the ECM illuminates MIL if the same malfunction is detected again in the 2 nd driving cycle.

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