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These are codes whose setting conditions were met during the last drive cycle,
but need to be met on two or more consecutive drive cycles before the DTC
actually sets. The intended use of this service is to assist the service
technician after a vehicle repair and after clearing diagnostic information, by
reporting test results after a single driving cycle.
a) If a test failed during the driving 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
In most cases the stored frame is the last DTC that occurred. Certain DTCs,
those that have a greater impact on vehicle emission, have a higher priority.
In these cases, the highest priority 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 resets 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.
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 compliance to
a state emissions program. Selecting I/M Readiness opens a submenu 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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