5.5.5 Read Freeze Frame(Mode $02)
Freeze frame data provides a snapshot of critical parameter values at the moment a
diagnostic trouble code (DTC) is set. This function allows you to display freeze frame
data for any stored emission-related DTC. Typically, the stored freeze frame data
corresponds to the last DTC that occurred.
However, for certain DTCs that have a significant impact on vehicle emissions,
priority is given. In these cases, the highest priority DTC is the one for which the
freeze frame records are retained, ensuring critical diagnostic information is
preserved.
5.5.6 I/M Readiness(Smog Check)
This function is used to check the readiness of the monitoring system. It is an
excellent function to use prior to having a vehicle inspected for compliance to a state
emissions program. Selecting I/M Readiness opens a sub-menu with two choices:
5.5.6.1 Since DTCs Cleared
Displays the status of monitors since the last time the DTCs are cleared.
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