Buell 2004 XB9S, Service Manual, Page: 314 / 597

2004 Buell Lightning: Fuel System 4-5
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DIAGNOSTIC INTRODUCTION 4.3
SYSTEM PROBLEMS
All system problems fall into at least one of three general cat-
egories.
No Start
The engine cranks over freely, but will not start. This does not
include situations where the engine will not crank, such as a
bad starter, dead battery, etc. This condition assumes that all
obvious checks (fuel in tank, etc.) have been made.
Poor Performance
The engine starts but there are performance problems. These
problems may include poor fuel economy, rough idle, engine
misfire, engine hesitation, severe spark knock, etc.
Check Engine Lamp
See Figure 4-2. The check engine lamp indicates a fault con-
dition exists. There may also be starting or performance prob-
lems.
RESOLVING PROBLEMS
NOTE
The most sophisticated method of resolving problems
involves using a computer based diagnostic package called
DIGITAL TECHNICIAN (Part No. HD-44750).
To resolve system problems, five basic steps are involved. In
order of occurrence, they are:
1. Check for trouble codes by observing check engine
lamp. See
4.4 CHECKING FOR TROUBLE CODES .
2. Retrieve trouble codes using check engine lamp diag-
nostics. See
4.5 CHECK ENGINE LAMP DIAGNOS-
TICS .
3. Diagnose system problems. This involves using special
tools and the diagnostic flow charts in this section.
4. Correct problems through the replacement and/or repair
of the affected components.
5. After repairs are performed, the work must be validated.
This involves clearing the trouble codes and confirming
proper vehicle operation as indicated by the behavior of
the check engine lamp.
Figure 4-2. Check Engine Lamp (XB9S Shown)
2
1. Low fuel lamp
2. Check engine lamp
1
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