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1.3 OBDII Monitor Readiness Status
OBDII systems must indicate whether or not the vehicle * s PCM
，
s monitor system has completed testing on
each component. Components that have been tested will be reported as “Ready”
，
or “Complete” , meaning they have
been tested by the OBD II system. The purpose of recording readiness status is to allow inspectors to determine if the
vehicle * s OBD II system has tested all the components and/or systems.
The power train control module (PCM) sets a monitor to “Ready” or “Complete” after an appropriate drive cycle
has been performed. The drive cycle that enables a monitor and sets readiness codes to “Ready” varies for each
individual monitor. Once a monitor is set as “Ready” or “Complete”
，
it will remain in this state. A number of factors,
including erasing of diagnostic trouble codes (DTCs) with a scan tool , 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.
1.4 OBD II Definitions
Power train Control Module (PCM) OBD II 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