Using Snapshots in Global Diagnostic System (GDS)

Overview 

A snapshot is a recording of what a control module on the vehicle was receiving for information while the snapshot is being made. A snapshot may be used to analyze the data during the time a vehicle condition is current. This allows you to concentrate on making the condition occur, rather than trying to view all the data in anticipation of the fault. In GDS 2, snapshots are automatically recorded whenever the user views Module Diagnostics, Vehicle Diagnostics and/or Systems Diagnostics. Module Diagnostics includes DTC Data, Identification Information, Data Display, Control Functions and Configuration/Reset Functions. Vehicle Diagnostics includes Vehicle Wide DTCs. Systems Diagnostics includes Inspection/Maintenance Status and Inspection/Maintenance Information.

Snapshot Replay 

The Snapshot Replay function allows reviews of previously recorded vehicle snapshot data. This information can be used in analysis of vehicle problems and detection of trigger error conditions. The graph function can be used to compare parameters to see if a component is functioning properly. Recorded snapshots can be selected for viewing by the following two methods:

• From the Home Page, click on Review Stored Data. In the Snapshot Select Page, highlight the vehicle in the upper pane and highlight the desired snapshot in the lower pane, then click the Select Snapshot button.
• The user can view a snapshot without ending a current on-vehicle diagnostic session by clicking the Module button (when active) or Back button until the Session Manager is displayed in the menu. This is used when a user is viewing live data and wants the quickest way to review the data. Click on the Session Manager button. Highlight the desired snapshot in the lower pane and click Select Snapshot

View Selections 

The following information can be selected in the tabs at the top of the screen:

• Line Graph - Displays information from the snapshot file in graph view. The current value of the parameters is displayed on the screen. Use the buttons on the right side to modify the graph data.
• Diagnostic Data Display - Displays incoming information from the snapshot file. The current value of the parameters is displayed on the screen. Use the buttons on the right side to modify the data.
• Bookmarks - If bookmarks are present, this displays the Type, Description and Time of automatic and manually generated bookmarks.
• System Information - Displays the GDS 2 Software Version and MDI Serial Number used when the snapshot was recorded.
• Selected Vehicle Configuration - Displays vehicle identifiers, such as transmission type, for the vehicle selected on the Stored Data screen in the Sessions field.
• RPO - Displays vehicle build information.

Snapshot Replay Functions 

To review the snapshot there are buttons at the bottom of the window to control the cursor. From left to right the buttons are:

• First Bookmark - This button moves the cursor to the previous bookmark.
• Back - This button moves the cursor back 1 frame.
• Timeline Slider Control - This allows the user to slide and select any position on the Timeline required.
• Forward - This button moves the cursor forward 1 frame.
• Last Bookmark - This button moves the cursor forward 1 bookmark.