5
operated under specific conditions before the monitor is ready. These
monitors are termed non-continuous monitors and are listed below:
1)
EGR System
2)
O2 Sensors
3)
Catalyst
4)
Evaporative System
5)
O2 Sensor Heater
6)
Secondary air
7)
Heated Catalyst
8)
A/C system
2.5
OBD II/EOBD Monitor Readiness Status
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 status is to allow inspectors to
determine if the vehicle
′
s OBD II system has tested all the components
and/or systems.
The powertrain 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
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
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