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 analyse 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. To record a snapshot in GDS, select, Record Snapshot, from the options at the top right portion of any of the various pages that allow snapshots to be taken (e.g. Data Display, Control Functions, etc.). When you are finished recording, select, Stop Snapshot recording. The snapshot will now be available for replay.
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 three methods:
| • | Selecting a snapshot file from the Vehicle Home Page and clicking on the Review selection. |
| • | Double clicking on the selected snapshot from the Vehicle Home Page. |
| • | Entering the Tools selection from the Menu selection and selecting Snapshot replay. Next, open the Snapshot Manager. Double click on the snapshot file you wish to view or click on the Load Snapshot selection and select a snapshot file. |
Regardless of selection method, a File Loaded pop-up window will be displayed from the Snapshot Replay screen. Select OK from the pop-up window.
Snapshot Play Functions
There are several snapshot play functions that are used to replay recorded snapshots
| • | The Play function is used to play the snapshot forward by clicking on this selection. A marker will move across the screen when this selection is used. All selections in this area turn grey when they are active. |
| • | The Pause function is used to pause play of the snapshot. When this selection is clicked a second time the snapshot will start playing where it left off. |
| • | The Stop function is used to stop playing the snapshot. The snapshot will start from the beginning, if Play is selected after using the Stop function. |
Time Control
Time control is used to control the snapshot replay. This function allows selection of a specific time frame, display of different views, and control of display speed. The following functions can be selected directly under Time Control.
| • | The Bookmark selection allows you to add a specific comment in the current display and return to this point in the future. When this option is selected, a pop-up window is displayed. Enter a bookmark name and select OK. |
| • | The Note Pad can be selected to add comments to the snapshot replay file at the current point of time. When this option is selected, a pop-up window is displayed. Enter a comment for the snapshot file and select OK. |
| • | The Load Snapshot (blue folder) opens a snapshot file and makes it ready for further analysis. This function is also available by clicking on an available snapshot file from the Snapshot Manager. |
| • | The Down Arrow displays all Time Control options when selected. Individual options can also be selected by clicking on the item you want. |
| • | The Snapshot Display Speed can be controlled by selecting this option. Slow speeds of 1/8X, 1/4X, and 1/2X can be selected. The real time speed can also be selected at 1. Faster speeds of 2X, 4X, and 8X can also be obtained by using this selection. |
View Selections
Each View Selection provides a different way of displaying vehicle data for analysis. The following functions can be selected under Available Views:
Note: The parameter name will be shown in the original language used for capture if no translation is available for the name.
| • | Parameter List View -- Displays incoming information from the snapshot file. The current value of the parameters is displayed on the screen. |
| • | Log View -- Contains all the information from the snapshot file. All parameter values are listed in the order they were recorded. Specific parameters can be added or removed from a watchlist by clicking on the appropriate item. |
| • | State View -- Shows the values of all parameters in a specific time frame. These values can be used for comparison with the trigger view. |
| • | Trigger View -- Displays all system and user defined triggers. This function can be used when there is a combination of factors involved in a diagnostic problem. When a Trigger condition is met a caution triangle will be displayed on the screen. |
Triggers:
| • | Load Triggers -- Allows you to load a file containing trigger definitions. |
| • | Save Triggers -- Allows you to save the trigger to your computer's hard drive. |
| • | Remove Trigger -- Allows you to remove the current trigger. It will no longer be present. |
| • | Edit Trigger -- Displays a pop-up window where you can modify the limits and parameters contained within a trigger. |
| • | Adds Trigger -- Displays a pop-up window to configure a trigger. |
| • | DTC View -- After the Play function is selected and this option is selected this function opens the list of recorded DTCs. |
| • | Line Graph View -- Displays data that can be visualised against the time-axis. From this view, specific parameters can be selected for graphing by checking the box under Selected. At the bottom of the graph there are four functions Zoom In (increase size), Zoom Out (decrease size), Bookmarks, and Pause Scrolling. Each of these functions can be accessed by clicking on them. |
| © Copyright Chevrolet. All rights reserved |
| © Copyright Chevrolet. All rights reserved |
