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GM Enhanced (OBD II) Diagnostics
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5
If one or more control modules stops
responding, the tool will display a mes-
sage that it is not responding. If you
choose to continue, dashes will replace
the module ID.
Press
to return to the GM Function List.
View Freeze Data
When an emission-related fault occurs, certain vehicle conditions are recorded
by the on-board computer. This information is referred to as a Freeze Frame
data. The information is a “snapshot” of the operating conditions at the time of
a fault. This data can be overwritten by faults with a higher priority.
✓ If codes were erased, then freeze frame data may not be stored in vehicle
memory.
Select
View Freeze Data
from the and
press
. A vehicle can store more
than one Freeze Frames or Failure
records. Use the
arrow keys
to select a DTC.
DTC Definition(s)
Pressing the arrow key displays
the DTC definition. Use the
arrow keys to view each DTC definition.
Pressing the
or arrow key
exits to the Freeze Data for: screen.
The cursor is positioned in front of the
last DTC definition viewed before exiting.
Fault Data
Select the Freeze Frame/Failure
Record and press the
key to
display the PIDs recorded at the time of
the fault.
Use the
arrow keys to move
through the list. The
arrow keys page up/down through the
list.
When done, press the
key to return to the GM Function List.
O2 Monitor Test
Refer to
“O2 Monitor Test
” on page 4-6 of
Global OBD II Diagnostics.
Non-Continuous Tests
Refer to
“Non-Continuous Tests
” on page 4-7 of
Global OBD II Diagnostics.
On-Board Systems
Refer to
“On-Board Systems
” on page 4-7 of
Global OBD II Diagnostics.