Actron 9640 User Manual
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GM Historic (OBD I) Diagnostics
5
A message appears asking if you are
sure. Press
LEFT/RIGHT to move the
brackets to the desired response and
press
ENTER.
Selecting NO and pressing
ENTER
returns you to the GM Function List.
Selecting YES displays a screen
prompting you to turn ignition ON. Turn
ignition key ON. Engine can be off or
running. Press
ENTER to continue.
displays. Press
ENTER to return to
theGM 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.
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
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.
Erase Codes?
Are You Sure?
Yes <No>
Turn Ign Key On
Engine Can Be Off
Or Running.
Press ENTER To Cont