Check Engine Lamp Diagnostics; Retrieving Trouble Codes - Buell 2008 XB SERIES Electrical Diagnostics Manual

CHECK ENGINE LAMP DIAGNOSTICS

RETRIEVING TROUBLE CODES

PART NUMBER
HD-44750 DIGITAL TECHNICIAN
Trouble codes may be retrieved without the use of the DIGITAL
TECHNICIAN (Part No. HD-44750).
1. Remove the protective cover from data link connector
[91A]. The data link connector's location is different for
each model. It is located under the fairing (Firebolt), under
the seat (Lightning) or behind the left airflow guide
(Ulysses).
2. To activate the diagnostic feature of the check engine
lamp, proceed as follows:
a. See Figure 2-6. Install diagnostic test wire from parts
shown.
b. See Figure 2-7. Install diagnostic test wire across
terminal "1" and terminal "2" on the data link connector
[91A].
c. Turn the Ignition Switch ON and wait approximately
eight seconds for the check engine lamp to start
flashing.
3. See Figure 2-8. All trouble codes are sent out as a series
of flashes. To retrieve the first digit of the trouble code
simply observe the number of times the check engine lamp
flashes.
a. The transmission of a trouble code is always preceded
by six rapid flashes (about 3 per second).
b. This "intermission" is followed by a 2 second pause
in which the check engine lamp is off.
c. The check engine lamp will then flash one or more
times to indicate the first digit of the trouble code. The
length of time the check engine lamp is illuminated
and the length of time in which it is off are each about
1 second in duration.
4. The second digit follows:
a. Following transmission of the first digit, there is
another 2 second pause in which the check engine
lamp is off.
b. The check engine lamp will then flash one or more
times to indicate the second digit of the trouble code.
Count the number of times the check engine lamp
flashes to retrieve the second digit.
5. If more than one trouble code is sent:
a. Following transmission of the second digit of the first
code, there is a third 2 second pause in which the
check engine lamp is off.
b. After the pause comes the intermission, which is fol-
lowed by transmission of the next recorded trouble
code.
c. All subsequent codes are sent in the same manner
each separated from the next by he intermission.
TOOL NAME
6. Once all codes have been sent, the data string is repeated.
When you have recorded the same trouble code twice, it
is an indication that the transmission has been restarted
and that all trouble codes have been retrieved.
If the check engine lamp flashes at a rate faster than normal,
then you are observing the "intermission" only, which means
that no trouble codes are present.
7. When examining trouble codes, write down all codes on
a piece of paper.
a. If trouble codes are present, refer to
Follow the applicable flow charts for each code.
b. If trouble codes are NOT present, but starting or drive
ability problems are evident, see charts under
2.8 INITIAL DIAGNOSTIC
8. Turn the Ignition Switch OFF.
9. Remove diagnostic test wire and install protective cover
over data link connector. Return data link connector to
original position
The engine may be started and run when the trouble codes
are received using a jumper wire on terminals "1" and "2" of
the data link connector. However, if the jumper wire is removed
with the engine running, the check engine lamp will continue
to flash trouble codes.To stop check engine lamp from flashing
codes, turn engine stop switch OFF.
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1. Part Number 72191-94 (2)
2. 2.0 in (51 mm) 18 Gauge Wire
Figure 2-6. Diagnostic Test Wire
2008 Buell XB Diagnostics: Engine Management 2-9
NOTE
Table
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NOTE
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2.5
2-13.
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