OBD2 CODE READER
9
OWNER’S MANUAL
will blink or flash. This indicates a severe problem and flashing is intended
to discourage vehicle operation. The vehicle on-board diagnostic system
can not turn the MIL off until the necessary repairs are completed or the
condition no longer exists.
DTC
--Diagnostic Trouble Codes (DTC) that identify 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.
OBDII Drive Cycle
--A specific mode of vehicle operation that provides
condition 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 on-board 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 throug h 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 specific drive cycle, consult the
vehicle's Owner's Manual.
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