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General Motors Tech2 User Guide

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• Below the first line is the number and name of the DTC.

• Diagnostic test status tells whether the test ran and whether it passed or failed.

• DTC status lists the DTC information. This is the status of the tests that were run

and the related DTC messages  that can be viewed by the technician. This
information  is based only on the DTC information  listed, since some  DTC
information  will not be available  on all applications.

2. If more than one DTC is set for a frame, scroll bars will appear at the right side of the

DTC window. To view other DTCs click-and-drag the scroll box or use the scroll
arrows.

To determine exactly when a DTC set during a snapshot, use the “Play Forward” and
“Play in Reverse” selections to play the snapshot with the DTC window still in view.
DTC information will continue to display for all the frames during which the DTC was
set.

• This information can be useful for diagnosing DTCs by displaying related data

parameters at the point in time when the code was set.

T I P

The View DTC Information icon will be highlighted if a code was set during a

snapshot. Select the View DTC Information icon. This will show any and all DTCs set
during the snapshot, since DTCs are stored for the duration of the snapshot

4. When a frame is reached for which a diagnostic trouble code does not exist, the DTC

window will display a blank.

T I P

In most snapshots, DTCs set near the trigger frame. To quickly locate the frame

where a DTC occurred, click on the “Trigger Frame” selection. Then use the “Forward One
Frame” or “Reverse One Frame” selections to view the frames just before and after the
trigger frame. Chances are the DTC will appear within these frames. If not, continue
viewing the snapshot using the “Play Forward” or “Play in Reverse” selections.

Diagnostic Trouble Code Change Mode

This feature allows the user to move from  trouble code to trouble code within the snapshot.
If you select the View  DTC Information  icon, when in a snapshot  the Snapshot  application
will display a split screen. This screen will consist of the DTC information  on the upper half
of the screen and the parameter  data display on the lower half of the screen.

If the DTC was not set in the selected  frame  of the snapshot, the DTC information  will not
display until the snapshot  is advanced  to the first frame  in which the DTC was set. Select
the Diagnostic Trouble Code Change  icon to advance to the first frame  of the DTC. In  DTC
change mode,  selecting  the forward or reverse arrows will move  the application  to only the
frames  in which a DTC was set.

Displaying Graphs

Graph display modes  give you the ability to view snapshot  parameters  in graph form.  This
allows you to see how a parameter  functions  over time.  It  also allows easy visual
comparison  of up to six  parameters  at a single time.  The two graph display modes  are
three-graph  and six-graph.