Displaying Graphs; Diagnostic Trouble Code Change Mode - GMC Tech2 User Manual

Table of Contents

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

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

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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.

3. 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.

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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.