4-66 2005 Buell Firebolt: Fuel System
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Code 21 Test
Remove airbox cover and foam from on top
of interactive muffler actuator.
NO
System OK.
Clear codes.
Connect BREAK OUT BOX and measure voltage
between pin 2 (Black) (-) and pin 9 (Black) (+). Discon-
nect terminal [164] from ECM. With Ignition on, Ground
opposite end of patch cord. When grounded, voltage
should be between 4-6 VDC, and 0-1 VDC when not
grounded.
YES
Check continuity between pin 9 (Black) and
[161B] pin 4. Continuity present?
NO
Disconnect [164] from ECM. Key on,
ground opposite end of patch cord.
Does the actuator cycle?
With the throttle in the wide open position,
Ignition on, Run/Stop on. Does the actuator
cycle smoothly?
NO
Check for continuity to ground on pin 9
(Black) with ECM disconnected.
Continuity present?
1
YES
Replace ECM
Check continuity to ground at
pin 2, [161B].
Continuity present?
2
NO
Locate and repair open on
BK wire.
YES
a
Ignition on, Run/Stop in Run
position. 12V present at pin 1,
[161B]?
NO
Locate and repair open on
O wire between fuse and
[161B].
YES
Check for continuity between
[164B] and [161B] pin 3.
Continuity present?
NO
Locate and repair open on
W wire.
Locate and repair
open on TN/V wire
[161B].
NO
Disconnect cable to inter-
active valve. Does valve
arm move freely without
binding?
YES
NO
Replace muffler
assembly
Replace inter-
active muffler
cable.
YES
Replace inter-
active muffler
actuator.
1
2
NO
YES
Locate and repair
short to ground on
TN/V wire [161B].
YES
With ECM connected, measure
voltage at [161B] pin 4.
0V 4-6 v 12V
Replace ECM Replace inter-
active motor.
Locate and repair
short to voltage on
TN/Y wire.
1
2
2
YES
YES.
Actuator opens and closes
2-6 seconds later
YES.
Opens and closes
immediately.
NO
Using pliers, gently pull on cable to
interactive muffler actuator. Cable
should cause interactive valve to open
and close freely without binding. Does
it?
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