Launch Creader PROFESSIONAL 129 EVO User Manual page 24

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Creader Professional 129 EVO / EVO+
3. I/M Readiness
An important part of a vehicle's OBD II system is the Readiness Monitors, which are
indicators used to find out if all of the emissions 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 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 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 OBD II 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 Injection
7. Heated Catalyst
8. A/C system
I/M refers to Inspection and Maintenance that is legislated by the Government to
meet federal clean-air standards. I/M Readiness indicates whether or not the various
emissions-related systems on the vehicle are operating properly and are ready for
Inspection and Maintenance testing.
The purpose of the I/M Readiness Monitor Status is to indicate which of the vehicle's
Monitors have run and completed their diagnosis and testing, and which ones have
not yet run and completed testing and diagnosis of their designated sections of the
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