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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
dierent part of the engine or emissions system, the “Trip Drive Cycle” needed
for each individual Monitor to run and complete varies.
OBD II Drive Cycle
-- A specific mode of vehicle operation that provides
conditions required to set all the readiness monitors applicable to the vehicle
to the “ready” condition. The purpose of completing an OBD II drive cycle is
to force the vehicle to run its onboard diagnostics. Some form of a drive cycle
needs to be performed after DTCs have been erased from the PCM’s memory
or after the battery has been disconnected. Running through a vehicle’s
complete drive cycle will “set” the readiness monitors so that future faults can
be detected. Drive cycles vary depending on the vehicle and the monitor that
needs to be reset. For vehicle specic drive cycle, consult the service manual.
Note: Do not confuse a “Trip” Drive Cycle with an OBD II Drive Cycle. A “Trip”
Drive Cycle provides the “Enabling Criteria” for one specic Monitor to run and
complete its diagnostic testing. An OBD II Drive Cycle must meet the “Enabling
Criteria” for all Monitors on a particular vehicle to run and complete their
diagnosc tesng.
Warm-up Cycle
- Vehicle operation after an engine o period where engine
temperature rises at least 40°F (22°C) from its temperature before starting,
and reaches at least 160°F (70°C). The PCM uses warm-up cycles as a
counter to automatically erase a specific code and related data from its
memory. When no faults related to the original problem are detected within a
specied number of warm-up cycles, the code is erased automatically.
Fuel Trim (FT)
- Feedback adjustments to the base fuel schedule. Short-term
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