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FX4000 Full System Scan Tool
problem with one or more of vehicle's systems and may
cause emissions to exceed federal standards. If the MIL
illuminates with a steady light, it indicates that a problem
has been detected and the vehicle should be serviced as
soon as possible. Under certain conditions, the
dashboard light will blink or flash. This indicates a severe
problem and flashing is intended to discourage vehicle
operation. The vehicle onboard diagnostic system cannot
turn the MIL off until necessary repairs are completed or
the condition no longer exists.
DTC -- Diagnostic Trouble Codes (DTC) that identifies
which section of the emission control system has
malfunctioned.
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.
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
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