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18
DTC & FFD
When this function is selected, the screen displays a list of Stored Codes and Pending
Codes. When the Freeze Frame data of certain DTCs are available for viewing, a
snowflake button will display on the right side of the DTC item.
The erase codes function can be applied by tapping the Clear DTC button at the bottom
of the screen.
Stored Codes
Stored codes are the current emission related DTCs from the ECM of the vehicle.
OBD II/EOBD Codes have a priority according to their emission severity, with higher
priority codes overwriting lower priority codes. The priority of the code determines
the illumination of the MIL and the codes erase procedure. Manufacturers rank
codes differently, so expect to see differences between makes.
Pending Codes
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 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, which
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.
Clear DTC
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.
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.
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