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 code readers 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 cannot 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 in every vehicles and the exact number of monitors in any
vehicle depends on the motor vehicle manufacturer’s emissions control
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