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3.5 I/M Monitors
The I/M Readiness (Inspection and Maintenance) function is
used to check the operations of the Emission System on
OBDII vehicles. I/M Readiness is an excellent function to use
prior to having a vehicle inspected for compliance to a state
emissions program.
During normal driving conditions, the vehicle's computer
scans the emission system. After a specific amount of drive
time (depending on vehicle), the computer's "monitors" will
decide if the vehicles emission system is working correctly or
not. When the "monitors" record:
• "READY" and check engine light has not come on -
vehicle will likely pass emissions test and the system being
checked is working properly.
• "NOT READY" (Incomplete) - vehicle was not driven
enough and needs to be driven until monitors record
"READY."
• "NOT APPLICABLE" - vehicle does not support that
monitor.
Some states MAY NOT require all monitors to be listed as
!
"READY" to pass the emissions test. Check with state
testing site for exact requirements. All states will fail a
vehicle who has the "check engine light" lit at time of test.
Depending on vehicle, disconnecting or a discharged
!
battery may erase trouble codes and clear status monitors.
3-6
Using the Tool
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