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3
LAUNCH Professional 919E User Manual
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.).
DLC -- Data Link Connector. The 16-cavity connector on the vehicle that
allows communication between the computer system and the diagnostic tool.
MIL -- Malfunction Indicator Lamp. The vehicle’s “Check Engine” warning light
that activates when a DTC is stored.
DTC -- Diagnostic Trouble Code. A code stored in the computer system’s
memory, which helps to identify the fault condition that is causing the MIL to
activate.
Freeze Frame Data -- Operating conditions that are stored when a DTC is
stored.
PID -- Parameter Identification Data. Data returned by the vehicle’s control
modules to the diagnostic tool.
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 fteen Monitors.
Enabling Criteria -- Also termed Enabling Conditions. They are the vehicle-
specific events or conditions that must occur within the engine before the
various monitors will set, or run. Some monitors require the vehicle to follow
a prescribed “drive cycle” routine as part of the enabling criteria. Drive cycles
vary among vehicles and for each monitor in any particular vehicle. Please
refer to the vehicle’s factory service manual for specic enabling procedures.
Trip - A Trip for a particular Monitor requires that the vehicle is being driven
in such a way that all the required “Enabling Criteria” for the Monitor to run
and complete its diagnostic testing are met. The “Trip Drive Cycle” for a
particular Monitor begins when the ignition key is turned “On.” It is successfully
completed when all the “Enabling Criteria” for the Monitor to run and complete
its diagnostic testing are met by the time the ignition key is turned “O.” Since
each of the fteen monitors is designed to run diagnostics and testing on a
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