Roadi RDT40 - Manual (Page 7)

OWNER S MANUAL
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OBD2 CODE READER
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components have been evaluated by the OBD II system. They are running
periodic tests on specific systems and components to ensure that they
are performing within allowable limits.
Currently, there are eleven OBD II Readiness Monitors (or I/M Monitors)
defined by the U.S. Environmental Protection Agency (EPA). Not all
monitors are supported by all vehicles and the exact number of monitors
in any vehicle depends on the motor vehicle manufacturer's emissions
control strategy.
Continuous Monitors -- Some of the vehicle components or systems
are continuously tested by the vehicle's OBDII 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 OBDII 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 and are listed below:
1. EGR System
2. O2 Sensors
3. Catalyst
4. Evaporative System
5. O2 Sensor Heater
6. Secondary air
7. Heated Catalyst
8. A/C system