To learn more about Emissions Inspection and Maintenance
(I/M) Readiness Monitors, see OBD 2 MONITORS on page 38.
Each Monitor has a specific function to test
and diagnose only its designated emissions-
related component or system. The names of
the Monitors (Oxygen Sensor Monitor, Catalyst
Monitor, EGR Monitor, Misfire Monitor, etc.)
describe which component or system each Monitor
is designed to test and diagnose.
Emissions Inspection and Maintenance (I/M) Readiness
Monitor Status Information
I/M Readiness Monitor Status shows which of the vehicle's Monitors
have run and completed their diagnosis and testing, and which ones
have not yet run and completed testing and diagnosis of their
designated sections of the vehicle's emissions system.
If a Monitor was able to meet all the conditions required to enable it
to perform the self-diagnosis and testing of its assigned engine
system, it means the monitor "HAS RUN."
If a Monitor has not yet met all the conditions required for it to
perform the self-diagnosis and testing of its assigned engine
system; it means the Monitor "HAS NOT RUN."
The Monitor Run/Not Run status does not show
whether or not a problem exists in a system. Monitor
status only indicates whether a particular Monitor has
or has not run and performed the self-diagnosis and
testing of its associated system.
Performing I/M Readiness Quick Check
When a vehicle first comes from the factory, all Monitors
indicate a DONE status. This indicates that all Monitors
have run and completed their diagnostic testing. The DONE
status remains in the computer's memory, unless the
Diagnostic Trouble Codes are erased or the vehicle's
computer memory is cleared.
Code Reader allows you to retrieve Monitor/System Status
Information to help you determine if the vehicle is ready for an
Emissions Test (Smog Check). In addition to retrieving Diagnostic
Trouble Codes, Code Reader also retrieves Monitor Run/Not Run
OBD 2
Using Code Reader
I/M READINESS TESTING
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