1.4 OBD II Monitor Readiness Statuses
OBD II 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 states is to allow inspectors to
determine if 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”, it will remain in this state. 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 owners manual.
2 Use the scan tool
2.1 Tool Descriptions
This section illustrates external features, ports and connectors of the
code reader.
