Instructions Manual

3-6
Using the Tool
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.
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