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GM Historic (OBD I) Diagnostics
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5
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 On-Engine Off or Running.
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.
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.
Select the type of data to view. Refer to
“Viewing Data” on page 3-11 for Entire
or Custom Data Lists.
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.
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.
!
WARNING
!
WARNING
GM Function List ?
1)Read Codes
2)Erase Codes [
` 3)View Data ~
Select Group ?
Engine Group 1
Engine Group 2
` Engine Group 3 ~
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~