GM Historic (OBD I) Diagnostics
View Data
The View Data function allows the user to view the vehicle Parameter Identification Data (PIDs) in real time. As the PCM monitors PIDs, they are simultaneously transmitted to the scan tool. The PIDs are continuously updated at the PCM’s rate.
In addition to reading codes, View Data is the most useful diagnostic function for isolating the cause of a vehicle operation problem. Viewing data is also used for observing sensor data and the ON/OFF state of switches, solenoids, and relays.
View Data can be performed with the ignition key
!! WARNING
Never operate the tool while driving. Have another person assist with the operation of the tool.
| Select View Data from the GM |
| Function List and press ENTER. If a |
| Select Group screen does not appear, |
| skip the Multiple Group section and |
| continue. |
5 | Multiple Group Vehicles |
Some vehicles display a Select Group screen for viewing data. In these cases, only one group of data can be viewed at a time.
GM Function List | ? | |
1)Read | Codes |
|
2)Erase | Codes | [ |
` 3)View | Data | ~ |
Select | Group |
| ? |
Engine | Group | 1 |
|
Engine | Group | 2 |
|
` Engine | Group | 3 | ~ |
Select the type of data to view. Refer to “Viewing Data” on page
After making a selection, press ENTER to establish a communication link.
Use the UP/DOWN arrow keys to scroll through the PIDs.
A Vehicle Data List header marks the beginning.
Select Data To View? 1)Entire Data List
`2)Custom Data List
~
Custom | Data List | ||
Codes | Present | Yes | |
1ST | GEAR SW | ON[ | |
A/F | RATIO | 18.8~ | |
Change the selection of Custom Data List parameters at any time by pressing the BACK key. This returns to the Custom Data List selection screen.
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