2003 Buell XB9S: Fuel System 4-17
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CHECK ENGINE LAMP NOT ILLUMINATED AT KEY ON 4.9
GENERAL
If the engine stop switch is set to RUN with the engine off, and
the ignition key switch is turned ON, the check engine lamp
should illuminate for four seconds. See Figure 4-12.
Battery voltage is supplied to the lamp bulb. The lamp bulb is
grounded by the ECM through the BK/Y wire. A lack of power
to the ECM will cause the check engine lamp to be inopera-
tive and also create a no start situation.
DIAGNOSTICS
Diagnostic Tips
Check for the following conditions:
● Check for open in BK/Y wire.
● Check for blown accessory fuse.
Diagnostic Notes
The reference numbers below correlate with the circled num-
bers on the Test 4.9 flow chart.
1. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404), black pin probe and patch cord.
2. See Figure 4-13. Inspect connector [10] (black) for con-
tamination or corrosion. If connection is good, replace
ECM. See 4.29 ELECTRONIC CONTROL MODULE.
3. Check continuity between instrument connector [39] Pin
7 and ECM connector [10] (black), Pin 4.
Figure 4-12. Check Engine Lamp
Figure 4-13. Electronic Control Module
1. Low fuel lamp
2. Check engine lamp
2
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