Check Engine Lamp - Buell 2008 XB SERIES Electrical Diagnostics Manual

CHECKING FOR TROUBLE CODES

CHECK ENGINE LAMP

The diagnose problems, start by observing the behavior of the
check engine lamp.
NOTES
All references to "Key ON" or "Ignition Switch ON" require
that the Ignition Switch be in the ON position and the
engine stop switch be set to RUN.
If the check engine lamp is not illuminated at Key ON or
if it fails to turn OFF after the initial four second period,
then a problem exists in the check engine lamp circuit.
See 2.10 CHECK ENGINE LAMP NOT ILLUMINATED
AT KEY ON or 2.11 CHECK ENGINE LAMP ON CON-
TINUOUSLY for more information.
1. When the Ignition Switch is turned ON after being OFF
for 2 seconds or more, the check engine lamp will illu-
minate for approximately four seconds and then turn off.
2. See Figure 2-5. After check engine lamp turns off after
being illuminated for the first four second period, one of
three situations may occur:
a. The check engine lamp remains off. This indicates
there are no current fault conditions or stored func-
tional trouble codes currently detected by the Elec-
tronic Control Module (ECM).
b. The check engine lamp stays off for only four seconds
and then comes back on for an eight second period.
This indicates a functional error code is stored, but
no current trouble code exists.
c. If the check engine lamp remains on beyond the eight
second period, then a current trouble code exists.
3. See 2.4 CHECKING FOR TROUBLE CODES, Code Types
for a complete description of trouble code formats.
2-6 2008 Buell XB Diagnostics: Engine Management
ed01485
Figure 2-3. Ignition Switch
ed01486 1
1. OFF position
2. RUN position
Figure 2-4. Engine Stop Switch
2.4
2