Trouble Code 21 - Buell 2007 FIREBOLT Service Manual

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TROUBLE CODE 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.
4-64 2007 Buell Firebolt: Fuel System
bd0016ax
Spare
13
19
Spare
20 14
Empty
21
15
ECM
22 16
Lights
23
17
Key Sw
24 18
Figure 4-44. Fuses and Diode
4.21
Empty
7 1
Diode
8 2
Bk/Hn/Mflr
9 3
Fan
10 4
IGN
11 11
5
Acces.
12 6