Buell 2008 XB SERIES, Electrical Diagnostics Manual, Page: 73 / 288

2.10
CHECK ENGINE LAMP NOT ILLUMINATED AT
KEY ON
GENERAL
If the engine stop switch is set to RUN with the engine off, and
the ignition switch is turned ON the check engine lamp should
illuminate for four seconds.
Battery voltage is supplied to the check engine lamp bulb. The
check engine lamp bulb is grounded by the Electronic Control
Module (ECM) through the (BK/Y) wire. A lack of power to the
ECM will cause the check engine lamp to be inoperative and
also create a no start situation.
ed01488
Figure 2-17. Check Engine Lamp (Typical)
DIAGNOSTICS
TOOL NAME PART NUMBER
HARNESS CONNECTOR TEST KIT HD-41404-B
Diagnostic Tips
Check for the following conditions:
• Check for open (BK/Y) wire.
• Check for open fuse.
• Check for failed bulb
Diagnostic Notes
Each reference number below correlates to a circled number
on the flow chart(s).
1. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404-B), black pin probe and patch cord.
2. See Figure 2-18 , Figure 2-19 , Figure 2-20 . Inspect con-
nector [10] (black) for contamination or corrosion. If con-
nection is good, replace ECM. See
2.13 NO ECM POWER .
3. Check continuity between instrument module connector
[39] terminal "7" and ECM connector [10] (black), terminal
"23".
ed01508
Figure 2-18. Electronic Control Module (Ulysses)
ed01348
Figure 2-19. Electronic Control Module (Lightning)
2008 Buell XB Diagnostics: Engine Management 2-23