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OBD-II/EOBD EOBD
MIL Status
This item is used to check the current condition of the malfunction indicator lamp (MIL). Additional
information, such as which ECM commanded the MIL on and the distance driven while the MIL is
on (if supported), can also be displayed. The MIL Status report can also be saved as part of the
vehicle records.
($01) Display Current Data
Use this test to display the serial data transmitted by the selected electronic control module
(ECM). The main body of the screen has two columns; the left-hand column is a description of the
parameter and the right-hand column is the parameter value or state. Viewing options and
operations are the same as Scanner, see Data Display‚ on page 35 for more information.
Figure 6-6 Sample current data display
($02) Display Freeze Frame Data
Freeze frame data provides a “snapshot” of critical parameter values at the time a DTC set.
This item is used to display freeze fame data for any stored emission related diagnostic trouble
codes (DTCs). In most cases the stored frame is the last DTC that occurred. Certain DTCs, those
that have a greater impact on vehicle emissions, have a higher priority. In these cases, the highest
priority DTC is the one for which the freeze frame records are retained.
($03) Display Trouble Codes
This is used to display any stored emission related DTCs reported by the ECM. The display is
similar to a Scanner code display (see Display Codes‚ on page 29 for details). The list does not
include enhanced DTCs in this mode.
($04) Clear Emissions Related Data
This item is used to clear all emission related diagnostic data, such as DTCs, freeze frame data,
and test results, from the memory of the selected ECM.
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