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7
A number of factors, including erasing of diagnostic trouble codes (DTCs)
with a scan tool or a disconnected battery, can result in Readiness Monitors
being set to “not ready”. Since the three continuous monitors are constantly
evaluating, they will be reported as “Ready” all of the time. If testing of a
particular supported non-continuous monitor has not been completed, the
monitor status will be reported as “Not Complete” or “Not Ready.”
In order for the OBD monitor system to become ready, the vehicle should
be driven under a variety of normal operating conditions. These operating
conditions may include a mix of highway driving and stop and go, city type
driving, and at least one overnight-off period. For specific information on
getting your vehicle’s OBD monitor system ready, please consult your
vehicle owner’s manual.
OBD II Terminology
Powertrain Control Module (PCM)--OBDII terminology for the on-board
computer that controls engine and drive train. Malfunction Indicator Light
(MIL)--Malfunction Indicator Light (Service Engine Soon, Check Engine) is a
term used for the light on the instrument panel. It is to alert the driver and/or
the repair technician that there is a 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 can not turn the MIL off until the
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.
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