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technician after a vehicle repair and after clearing diagnostic information
by reporting test results after a driving cycle.
a) If a test failed during the drive cycle, the DTC associated with that
test is reported. If the pending fault does not occur again within 40
to 80 warm-up cycles, the fault is automatically cleared from memory.
b) Test results reported by this service do not necessarily indicate a
faulty component or system. If test results indicate another failure
after additional driving, then a DTC is set to indicate a faulty
component or system and the MIL is illuminated.
⚫ Freeze Frame
Typically, the stored frame is the last DTC that occurred. Certain DTCs,
that have a greater impact on vehicle emission, have a higher priority. In
these cases, the top prioritized DTC is the one for which the freeze frame
records are retained. Freeze frame data includes a “snapshot” of critical
parameter values at the time the DTC is set.
⚫ Erase Codes
This option is used to clear all emission related diagnostic data such as
DTCs, freeze frame data and manufacturer-specific enhanced data from
the vehicle’s ECM, and reset the I/M Readiness Monitor Status for all
vehicle monitors to Not Ready or Not Complete status.
A confirmation screen displays when the clear codes option is selected
to prevent accidental loss of data. Select Yes on the confirmation screen
to continue or No to exit.
8.5.2.2 I/M Readiness
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 state
emissions compliance. Select I/M Readiness to display a sub menu with two
choices:
⚫ Since DTCs Cleared – displays the status of monitors since the last time
the DTCs are erased.
⚫ This Driving Cycle – displays the status of monitors since the beginning
of the current drive cycle.
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