Actron GM Code Scanner CP9001 - Manual (Page 10)

10
• A code 12 is always sent even
when the computer sees no
problem. This tells you the
computer diagnostic checks are
working properly. If you do not get
a code 12, or if the “Check Engine”
light does not flash you have a
problem which must be repaired.
Refer to “Diagnostic Circuit Check”
procedure in vehicle service
manual. (See manual listing on
page 4.)
• All codes are two (2) digits long.
• Codes are sent in numeric order
from the lowest number to the
highest.
Transmission Codes:
The engine computer can send trouble
codes for transmission problems - if
the vehicle has a computer controlled
transmission.
NOTE: Some diesel powered trucks
have a computer controlled transmis-
sion. These vehicles will only send
transmission related codes since the
the diesel itself is not computer
controlled.
• GM Vehicles
–The “Check Engine” light flashes
both engine codes and transmis-
sion codes.
• Saturn Vehicles
–The “Check Engine” light flashes
engine codes.
–The “Shift to D2” light flashes
transmission codes.
Look for a code 11 flashed on the
“Check Engine” light. This is a signal
telling you transmission codes will then
be flashed on the “Shift to D2” light.
Transmission codes are flashed in a
way similar to engine codes.
9) Turn Ignition Key OFF
10)Remove Code Scanner and Re-
install Connector Cover, if
supplied.
The computer system is now back
to normal operation.
11)Refer to “Test Results” chart on
page 9
This completes the code reading
procedure.
At this point you can either:
• Have your vehicle professionally
serviced. Trouble codes indicate
problems found by the computer.
or,
• Repair the vehicle yourself using
trouble codes to help pinpoint the
problem.