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Diagnostics Operations Generic OBD II Operations
51
4.8.2 Function Descriptions
This section describes the various functions of each diagnostic option:
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 functional button at
the lower bottom of the screen.
Figure 4-15 Sample DTC & FFD 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.
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