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OBD II Monitor Readiness Status
OBD II systems must indicate whether or not the vehicle’s PCM monitoring has
completed testing on each emission component. Components that have been OBD II
tested will be reported as “OK”. The purpose of recording readiness status is to allow
inspectors to determine if the vehicle’s OBD II system has tested all the emissions
systems. This is handy to know before bringing the vehicle to a state emissions
testing facility.
The powertrain control module (PCM) sets a monitor to “OK” after an appropriate
drive cycle has been performed. The drive cycle that enables a Monitor and sets
readiness codes to “OK” varies for each individual monitor. Once a monitor is set as
“OK”, it will remain in this state. Several factors, including erasing diagnostic trouble
codes (DTCs) with a code reader or a disconnected battery, can result in Readiness
Monitors being set to “INC” (incomplete). Since the three continuous monitors are
constantly evaluating, they will be reported as “OK” all of the time. As long as there
are no DTCs stored in memory, the vehicle is running following the OBD II guidelines.
If testing of a particular supported non-continuous monitor has not been completed
or not tested, the monitor status will be reported as “INC” (incomplete).
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-o
period. For specic information on getting your vehicle’s OBD monitor system ready,
please consult your vehicle owner’s manual.
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