Obd Ii Readiness Monitors - Launch Creader Professional 129 Evo User Manual

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Creader Professional 129 EVO / EVO+
Figure 2 – 2

2.4 OBD II Readiness Monitors

An important part of a vehicle's OBD II system is the Readiness Monitors, which are
indicators used to fi nd out if all of the emissions components have been evaluated
by the OBD II system. They are running periodic tests on specifi c systems and
components to ensure that they are performing within allowable limits.
Currently, there are eleven OBD II Readiness Monitors (or I/M Monitors) defi ned by the
U.S. Environmental Protection Agency (EPA). Not all monitors are supported in every
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 OBD II system, while others are tested only under specifi c
vehicle operating conditions. The continuously monitored components listed below are
always ready:
1. Misfi re
2. Fuel System
3. Comprehensive Components (CCM)
Once the vehicle is running, the OBD II system is continuously checking the above
components, monitoring key engine sensors, watching for engine misfi re, and
monitoring fuel demands.
Non-Continuous Monitors -- Unlike the continuous monitors, many emissions and
engine system components require the vehicle to be operated under specifi c conditions
before the monitor is ready. These monitors are termed non- continuous monitors and
are listed below:
4. EGR System
5. O2 Sensors
6. Catalyst
7. Evaporative System
8. O2 Sensor Heater
9. Secondary air Injection
10
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D
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C
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