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Professional 909 User Manual
performing this function, please be sure the vehicle’s ignition key is in the ON
position with the engine off.
*Notes:
• When this funcon is used to erase DTCs from the vehicle’s on-board computer,
“Freeze Frame” data is erased and “Permanent” DTCs ARE NOT erased.
• When data is erased from the vehicle’s computer memory, the I/M Readiness
Monitor Status program resets the status of all Monitors to a “Not Completed”
status. To set all of the Monitors to a “Completed” status, an OBD II Drive Cycle
must be performed. Refer to your vehicle’s service manual for informaon on how
to perform an OBD II Drive Cycle for the vehicle under test.
After clearing, you should retrieve trouble codes once more or turn ignition on
and retrieve codes again. If there are still some trouble codes in the system,
please troubleshoot the code using a factory diagnosis guide, then clear the
code and recheck.
3. I/M Readiness
I/M refers to Inspection and Maintenance that is legislated by the Government
to meet federal clean-air standards. I/M Readiness indicates whether or not the
various emissions-related systems on the vehicle are operating properly and are
ready for Inspection and Maintenance testing.
The purpose of the I/M Readiness Monitor Status is to indicate 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.
The I/M Readiness Monitor Status function also can be used (after repair of
a fault has been performed) to confirm that the repair has been performed
correctly, and/or to check for Monitor Run Status.
Fig. 5-13
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