Actron 9640 User Manual page 69

GM Historic (OBD I) Diagnostics
Playback
The Playback function is used to playback a Record Data recording. This
function is very similar to View Data. The only difference is that View Data is
a real time viewing of PIDs, while Playback is a viewing of previously recorded
PIDs.
Select Playback from the Review Data
screen and press ENTER:
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 5-5.
Select which list to playback. Refer to
"Viewing Data" on page 3-11 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 UP/DOWN arrow keys to
scroll through the data line by line.
The end of the list is reached when
the DOWN arrow icon is not visible.
• The LEFT/RIGHT arrow keys are
used to increase or decrease the
Frame/Time index. Time 0.0 is the
trigger point, when the user pressed ENTER. 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 LEFT/RIGHT 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
BACK key. This will return to the Custom Data List selection display
screens. When done, press BACK to return to Review Data or FUNC to
return to the GM Function List.
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Review Data
1)DTC (Codes)
` 2)Playback
Playback Data As
1)Entire Data List
` 2)Custom Data List
Vehicle Data List
CODES PRESENT
CALC LOAD(%)
FRAME: 1 Time: 4.4
?
~
?
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5
?
YES
7.0[
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