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operated under specific conditions before the monitor is ready. These
monitors are termed non-continuous monitors and are listed below:
1) EGR System
2) O
2 Sensors
3) Catalyst
4) Evaporative System
5) O
2 Sensor Heater
6) Secondary air
7) Heated Catalyst
8) A/C system
2.5 OBD II 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 code reader 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
② 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.
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