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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.
2.5 OBD II Terminology
The following terms and their definitions are related to OBD II systems.
Read and reference this list as needed to aid in the understanding of OBD II
systems.
Powertrain Control Module (PCM)
-- The PCM is the OBD II accepted term
for the vehicle’s “on-board computer.” In addition to controlling the engine
management and emissions systems, the PCM also participates in controlling
the powertrain (transmission) operation. Most PCMs also have the ability to
communicate with other computers on the vehicle (ABS, ride control, body,
etc.).
Monitors
-- Monitors are “diagnostic routines” programmed into the PCM. The
PCM utilizes these programs to run diagnostic tests, and to monitor operation
of the vehicle’s emissions-related components or systems to ensure they
are operating correctly and within the vehicle’s manufacturer specifications.
Currently, up to fifteen Monitors are used in OBD II systems. Additional
Monitors will be added as the OBD II system is further developed.
Note: Not all vehicles support all een Monitors.
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