4-66 2007 Buell Lightning: Fuel System
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Code 21 Test
Remove air cleaner cover.
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?
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?
YES
Replace ECM.
Check continuity to ground at
pin 2, [161B].
Continuity present?
2
NO
Locate and repair open on
BK wire.
YES
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].
Using pliers, gently pull on cable to
interactive muffler actuator. Cable
should cause interactive muffler valve
to open and close freely without bind-
ing. Does it?
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
YES
YES
Locate and repair
short to ground on
TN/V wire [161B].
NO
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
Opens and closes
immediately.
NO
YES
Locate and repair short to ground on O
wire or Y/BK or R/Y wire in
Brake/Horn/Muffler Circuit.
Check fuse.
Is fuse O.K.?
NO
YES
NO
1
2
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