4-64 2007 Buell Firebolt: Fuel System
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TROUBLE CODE 21 4.21
GENERAL
The interactive exhaust system utilizes an actuator valve in
the muffler which is connected to a servo motor via a cable.
The valve position automatically adjusts to enhance engine
performance.
Active Muffler Control (XB12 Models Only)
A Code 21 will set if the ECM detects that the output for the
Interactive Muffler Control Actuator is not in agreement with
the feedback circuit.
● Mechanical fault in the actuator, valve or cable.
● Electrical fault in the actuator circuit.
● Electrical fault in the actuator feedback circuit.
● Electrical fault in the brake light or horn circuits.
● Blown fuse.
Diagnostic Notes
The reference numbers below correlate with the circled num-
bers on the Code 21 flow charts.
1. Using TEST CONNECTOR KIT (Part No. HD-41404),
attach red probe and patch cord to [164B] (1, 2).
2. Using TEST CONNECTOR KIT (Part No. HD-41404),
use gray male pin probe and patch cord.
Figure 4-44. Fuses and Diode
19
20
21
22
23
24
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
10
11
12
11
Spare
Diode
Bk/Hn/Mflr
Fan
IGN
Acces.
Key Sw
Lights
ECM
Spare
Empty
Empty
ax
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