4-8 2007 Buell Lightning: Fuel System
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CHECK ENGINE LAMP DIAGNOSTICS 4.5
RETRIEVING TROUBLE CODES
Trouble codes may be retrieved without the use of the DIGI-
TAL TECHNICIAN (Part No. HD-44750).
1. Remove protective cover from data link connector [91A].
Data link connector is located next to the fuse box under
the seat.
2. To activate the diagnostic feature of the check engine
lamp, proceed as follows:
a. See Figure 4-6. Create diagnostic test wire from
parts shown.
b. See Figure 4-7. Install diagnostic test wire across
Terminal 1 and Terminal 2 on the data link connector
[91A].
c. Turn the ignition/light key switch ON and wait
approximately eight seconds for the check engine
lamp to start flashing.
3. See Figure 4-8. 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 lamp flashes.
a. The transmission of a trouble code is always pre-
ceded by six rapid flashes (about 3 per second).
b. This “intermission” is followed by a 2 second pause
in which the lamp is off.
c. The lamp will then flash one or more times to indi-
cate the first digit of the trouble code. The length of
time the 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 lamp is off.
b. The lamp will then flash one or more times to indi-
cate the second digit of the trouble code. Count the
number of times the lamp flashes to retrieve the sec-
ond 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
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 the intermission.
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.
Figure 4-6. Diagnostic Test Wire
Figure 4-7. Installing Diagnostic Test Wire
b0523x4x
1 2 1
1. Part Number 72191-94 (2)
2. 2.0 in. (51 mm) 18 Gauge Wire
1. Terminal 1: Receive Data Line (Lt GN/R)
2. Terminal 2: Ground (BK)
3. Terminal 3: Transmit Data Line (V/R)
4. Terminal 4: Power (GY)
5. Protective Cap
6924
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