Roadi RDT51 - Manual (Page 7)

OWNER S MANUAL
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OBD2 Car Scanner
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CHECK
2.3 Location of the Data Link Connector (DLC)
The DLC (Data Link Connector or Diagnostic Link Connector) is the
standardized 16-cavity connector where diagnostic scan tools interface
with the vehicle's on-board computer. The DLC is usually located 12
inches from the center of the instrument panel (dash), under or around the
driver s side for most vehicles. If Data Link Connector is not located under
dashboard, a label should be there telling location. For some Asian and
European vehicles, the DLC is located behind the ashtray and the ashtray
must be removed to access the connector. If the DLC can not be found,
refer to the vehicle's service manual for the location.
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 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 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 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.
DLC