GM Enhanced (OBD II) Diagnostics
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5
•
Since IGN
(ignition): PASS, FAIL, P/F, or NOT RUN
Provides the DTC status during this power-up. P/F (Pass/Fail) indicates the
PCM detected the DTC that passed and failed at least once during this
power-up cycle. NOT RUN means the PCM has not tested for t he c ondition
that set the DTC during this power-up cycle.
•
Since Clear
: PASS, FAIL, P/F, or NOT RUN
Provides the DTC status since the last time the codes were erased.
P/F indicates the PCM test that detected the DTC passed and failed at least
once since the last
Erase Code
. NOT RUN means the PCM has not tested
for the condition that set the DTC since the last
Erase Code
.
Select
Read Codes
and press .
The Scan Tool displays the DTCs or a message stating SYSTEM PASS: NO
CODES FOUND. Scroll down to view the DTCs or press the key to return
to the GM Function List.

Use the arrow keys to view the DTCs. Use the

arrow keys to toggle the DTC definition and status screen.

Press to return to the GM Function List.
Pending Codes
Refer to
“Pending Codes
” on page4-3 of
Global OBD II Diagnostics.
Erase Codes
Refer to
“Erase Codes
” on page4-3 of
Global OBD II Diagnostics.
View Data
The
View Data
function allows you to view the vehicle’s Parameter Identifica-
tion (PID) data in real time. As the computer monitors the vehicle, the informa-
tion is simultaneously transmitted to the scan tool. Apart from
Read Codes
,
View Data
is the most useful diagnostic function for isolating the caus e of a vehi-
cle operation problem. Viewing data is also used for observing sensor data and
the status of switches, solenoids, and relays.