User Manual

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 4 – 3
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • GM Historic Diagnostics
4
Selecting YES displays a screen
prompting you to turn ignition ON. Turn
ignition key ON. Engine can be off or
running. Press
(17(5 to continue.
A message confirming that the Erase
Codes command was successful
displays. Press
(17(5 to return to the
GM Function List.
Manual Erase Methods
Alternate Method 1:
1) Turn Ignition Key Off.
2) Locate Fuse Box and Remove ECM Fuse.
3) Wait 20 seconds.
4) Replace the Fuse.
Alternate Method 2:
1) Turn Ignition Key Off.
2) Remove Power from Scan Tool.
3) Disconnect Scan Tool from Vehicle.
4) Remove Negative (–) Battery Cable. Wait 30 seconds, then replace the cable.
✓ The computer has a “learning” ability to compensate for minor variations in
engine operation. Whenever power is removed from the PCM, the computer
must “relearn” various functions. Vehicle performance may be noticeably
different until this is accomplished. This is a temporary situation and is normal.
The “learning” process takes place during warm engine driving.
VIEW DATA
The View Data function allows the user to view the vehicle Parameter
Identification Data (PIDs) in real time. As the PCM monitors PIDs, they are
simultaneously transmitted to the scan tool. The PIDs are continuously updated
at the PCM’s rate.
In addition to reading codes, View Data is the most useful diagnostic function for
isolating the cause of a vehicle operation problem. Viewing data is also used for
observing sensor data and the ON/OFF state of switches, solenoids, and relays.
View Data can be performed with the ignition key On-Engine Off or Running.
Never operate the tool while driving. Have another person
ASSIST WITH THE OPERATION OF the tool.
(GD@9@7K#@
@9;@73@7#88
#D&G@@;@9X
$D7EE"(&(AA@F
D3E7A67EA??3@6
'7@FX$7D8AD?&
#'G@5F;A@(A
*7D;8KD3E7X
!
WARNING
!
WARNING