Definition Of Terms

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

TERMS DEFINITION

Term	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 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 a sensor is being monitored, a 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 a malfunction only one time during a single driving cycle.
	"Continuous" means that the ECM a detects malfunction every time when the enabling condition is met
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 the MIL the instant the ECM determines that there is a malfunction.
	"2 driving cycle" means that the ECM illuminates the MIL if the same malfunction is detected again in the 2nd driving cycle
Component operating range	Normal operation range of sensors and solenoids under normal driving conditions.
	Use these ranges as a reference.
	They cannot be used to judge if a sensor or solenoid is defective or not.