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GM Historic (OBD I) Diagnostics
5
View Data
✓The View Data function allows the user to view the vehicle
parameter identification (PID) data in real time. As the powertrain
control module (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 key on engine off (KOEO) or key
on engine running (KOER).
Never operate the Scan Tool while driving. Have
another person assist with the operation of the Scan
Tool.
From the Datastream Menu:
1.Select View Data.
•Use
UP
or
DOWN
arrow
key until View Data is
highlighted.
•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.
!
WARNING
View Data
Record Data
Review Data
Print Data
Tool Setup
Datastream Menu
View Data
Engine Group 1
Engine Group 2
Engine Group 3
Select Group
Engine Group 1