Download CODE SCANNER - Bosch Diagnostics

• 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.
9) Turn Ignition Key OFF
10)Remove Code Scanner and Reinstall Connector Cover, if
supplied.
The computer system is now back
to normal operation.
11)Refer to “Test Results” chart on
page 11.
• All codes are two (2) digits long.
• Codes are sent in numeric order
from the lowest number to the
highest.
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,
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 transmission. 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 transmission 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.
• Repair the vehicle yourself using
trouble codes to help pinpoint the
problem.
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