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3001
User’s Manual
25
*Notes:
Before performing this function, make sure to retrieve and record the trouble codes.
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.
4. Data Stream
This option retrieves and displays live data and parameters from the vehicle’s
ECU.
5. View Freeze Frame
When an emission-related fault occurs, certain vehicle conditions are recorded by
the on-board computer. This information is referred to as freeze frame data.
Freeze Data is a snapshot of the operating conditions at the time of an
emission-related fault.
*Note: if DTCs were erased, Freeze Data may not be stored in vehicle memory
depending on vehicle.
6. O2 sensor test
OBD2 regulations require that applicable vehicles monitor and test operation of
the oxygen (O2) sensors to identify problems that can affect fuel efficiency and
vehicle emissions. These tests are performed automatically when engine
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