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Diagnostic Menu
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I/M Monitors (Emissions)
The I/M Monitors (Inspection / Maintenance) function is used to view
a snapshot of the operations for the emission system on OBD II
vehicles.
I/M Monitors is a very useful function. To guarantee no faults exist
make sure all monitors are ok or n/a and no DTC’s exist.
Refer to the vehicles service manual for the drive cycle operation.
During normal driving conditions, the vehicle’s computer scans the
emission system. After a specific amount of drive time (each monitor
has specific driving conditions and time required), the computer’s
monitors decide if the vehicles emission system is working correctly
or not as well as detecting out of range values. When the monitor’s
status is:
ok - vehicle was driven enough to complete the monitor.
inc (Incomplete) - vehicle was not driven enough to complete the
monitor.
n/a (Not Applicable)- vehicle does not support that monitor.
Depending on vehicle, disconnecting or a discharged battery may
erase DTCs and clear monitor status.
Monitors may be cleared by:
Erasing codes
Vehicle control modules losing powerk
I/M Monitors can be done key on engine running (KOER) or key on
engine off (KOEO).
Extreme weather and/or road conditions can prevent a monitor from
running. Also, some monitors may require a cold start to complete.
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