System Problems - Buell 2008 XB SERIES Electrical Diagnostics Manual

DIAGNOSTIC INTRODUCTION

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
security disabled 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 2-2.The check engine lamp indicates the Electronic
Control Module (ECM) has determined a fault condition exists.
There may also be starting or performance problems.
ed01467
1. Low fuel lamp
2. Check engine lamp
Figure 2-2. Check Engine Lamp (Typical)
1 2
RESOLVING PROBLEMS
PART NUMBER
HD-44750 DIGITAL TECHNICIAN
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 diagnostic trouble codes (DTCs) by observing
check engine lamp. See
CODES.
2. Retrieve trouble codes using check engine lamp dia-
gnostics. See 2.5 CHECK ENGINE LAMP
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.
2008 Buell XB Diagnostics: Engine Management 2-5
TOOL NAME
NOTE
2.4 CHECKING FOR TROUBLE
DIAGNOSTICS.
2.3