Scan Tool Snapshot Procedure
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. |
| • |
DTC Display – This tab
will be displayed when a DTC is current or the status has changed.
The tab will not be displayed when there are no DTCs. |
| • |
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 options 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:
| • |
Return to Frame 0 – This
button returns the cursor to frame 0. |
| • |
Stop – This button
pauses or stops the cursor. Click the Play button to resume.
|
| • |
Play – This button
starts the replay of the data. |
| • |
Play Speed – This button
changes the speed between 1x, 2x, 4x and 8x. |
| • |
Back 1 Frame – This
button moves the cursor back 1 frame. |
| • |
Forward 1 Frame – This
button moves the cursor forward 1 frame. |
| • |
Previous Bookmark – This
button moves the cursor to the previous bookmark. |
| • |
Next Bookmark – This
button moves the cursor forward 1 bookmark. |
|
