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GM Historic (OBD I) Diagnostics
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5
Select
Playback
from the Review Data
screen and press
:
✓ If a recording does not exist in the tool memory, then the tool will display
a “NO RECORDING PRESENT” message. Perform “
Record Data
” on
page 5-4.
Select which list to playback. Refer to
“
Viewing Data
” on page 3-9 of
Using
The Scan Tool
for Entire or Custom
Data Lists.
The Playback screen has a Vehicle Data List header to mark the beginning of
the data list. The recorded PIDs are displayed next. Line 4 displays the Frame
number and Time in seconds.
• Use the
arrow keys to
scroll through the data line by line.
The end of the list is reached when
the
arrow icon is not visible.
• The
arrow keys are
used to increase or decrease the
Frame/Time index. Time 0.0 is the
trigger point, when the user pressed
. A time interval with a minus
sign (–) occurs before the trigger point.
• The tool recording time varies. A recording consists of 5 frames of data prior
to the trigger and several frames after the trigger. The number of PIDs
recorded will determine the number of frames.
✓ After reaching the last time interval recorded. The
Time
display will
change from data recorded after trigger to data recorded before. This is
normal. The
arrows may be used to scroll through all time
intervals in either direction.
✓ Some vehicles will wait 3 to 4 minutes after the driveability problem first
occurs before storing a trouble code in the vehicle’s on-board computer.
If you selected
Trigger On Codes
when you made your recording, you
might not see any drastic change in data parameters before and after the
trigger point. In cases like this, it is better to manually trigger the start of
the recording when the driveability symptom is first observed.
To change the selections of Custom Data List parameters, press the
key.
This will return to the Custom Data List selection display screens. When done,
press
to return to Review Data or to return to the GM Function
List.
Field Service
Field Service
is a special diagnostic mode to monitor fuel system operation and
read DTCs. Some GM service manuals may refer to this mode as the Field Ser-
vice Mode Check. This mode works on vehicles equipped with a 12-pin ALDL
connector with a wire present in Pin-B, Diagnostic or Test Enable. The scan tool
enters this mode by grounding Pin-B: shorting Pin-B to Pin -A (ground).