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GM Historic (OBD I) Diagnostics
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5
Select the type of data to view. Refer to
“
Viewing Data
” on page 3-9 for Entire
or Custom Data Lists.
After making a selection, press
to establish a communication link.
Use the
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
key. This returns to the
Custom Data List selection screen.
Record Data
The
Record Data
function records vehicle PIDs (Parameter Identification Data)
while the vehicle is parked or being driven. This function is mainly used for diag-
nosing intermittent driveability problems that cannot be isolated by any other
method. The tool records data based on time (5 frames prior to the start of the
recording, and for a duration after). The time after depends on the vehicle data
rate. The
Record Data
function allows diagnosis of an intermittent problem by
analyzing data leading up to the problem, during the problem, and possibly after
the problem, depending on duration.
Select
Record Data
from the GM Func-
tion List
and press . Follow all
instructions on the display.
✓ The tool can maintain only one recording at a time. Be sure to thoroughly
review the old recording before erasing it.
Never operate the tool while driving. Have another person
assist with the operation of the tool.
This function can be performed with the ignition key On-Engine Off or Running.
If a recording currently exists in memory,
a message to Erase Old Recording is
displayed. The tool stores only one
recording at a time, so be sure to review
it before erasing it.
Multiple Group Vehicles
Some vehicles display a Select Group screen for recording data. In these
cases, only one group of data can be recorded at a time. Recording another
group of data overwrites the present one.
In the next screen, select a method to
trigger a recording.
Manual Trigger
will
begin recording when the
key
pressed.
Trigger On Codes
will begin
recording when a DTC is stored in the
PCM.
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WARNING
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WARNING