2.4 OBD II Readiness Monitors
An important part of a vehicle‟s EOBD system are the Readiness
Monitors, which are indicators used to find out if all of the emissions
components have been evaluated by the EOBD system. They are
running periodic tests on specific systems and components to ensure
that they are performing within allowable limits.
Continuous Monitors -- Some of the vehicle components or systems
are continuously tested by the vehicle‟s EOBD system, while others
are tested only under specific vehicle operating conditions. The
continuously monitored components listed below are always ready:
1）Misfire
2）Fuel System
3）Comprehensive Components (CCM)
Once the vehicle is running, the EOBD system is continuously
checking the above components, monitoring key engine sensors,
watching for engine misfire, and monitoring fuel demands.
Non-Continuous Monitors -- Unlike the continuous monitors, many
emissions and engine system components require the vehicle to be
operated under specific conditions before the monitor is ready. These
monitors are termed non-continuous monitors. For for pertrol (spark
ignition) or diesel (compression ignition) engines, the available monitors
are also different.
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