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34
NOTE
Some functions are supported only on certain vehicle manufacturers.
Function Descriptions
This section describes the various functions of each diagnostics option:
4.5.2.1 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.
Figure 4-18 Sample DTC & FFD Screen
Stored Codes
Stored codes are the current emission related DTCs from the ECM of the vehicle.
OBDII/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 diagnostics information, by reporting test results after a driving cycle.
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.
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.
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