Buell 2008 XB SERIES Electrical Diagnostics Manual page 153

Fuel Pump: DTC P0628 (33); DTC P0629 (33)
With DVOM still connected,
check for intermittents by
performing wiggle test . See 2.7
WIGGLE TEST while repeating
first test of this flow chart.
Intermittents present?
YES
Repair as
necessary.
YES
Reinstall original
Fuel Pump. See
FUEL PUMP in
appropriate Buell
Service Manual.
and replace ECM.
Clear DTCs and confirm proper operation with no
check engine lamp. Codes can be cleared using
DIGITAL TECHNICIAN (Part No. HD-44750).
After replacing ECM or TPS, TPS zero set
procedure must be performed. Refer to
THROTTLE POSITION SENSOR in the
appropriate Buell Service Manual.
Attach Breakout Box (B-48115) to Electronic Control
Module (ECM). With DVOM (Part No. HD-39978),
measure voltage between Breakout Box terminals "7"
1
and "28" (Black) and ground after Ignition Switch is
2
turned ON. Meter should read less than 2.0 volts and
the Fuel Pump should run for 2-3 seconds.
YES
NO
Replace Fuel Pump. See
FUEL PUMP in appropriate
Buell Service Manual. Clear
DTCs and road test. Did
check engine lamp turn ON
and set only P0628?
NO
System
OK.
NOTES:
Does it?
YES
Disconnect ECM.
Does Fuel Pump run
continuously?
YES NO
Check continuity
Locate and
Replace
between (O/GY)
repair short
ECM.
wire at fuel pump
to ground
fuse and ground.
on (BN/Y)
Is continuity
wire.
YES
Replace
fuse.
YES
2008 Buell XB Diagnostics: Engine Management 2-103
NO
Fuel Pump
on continuously?
NO
Check fuel pump
fuse.
Is fuse good?
YES NO
Check continuity of
(O/GY) wire
between fuel pump
fuse and fuel
pump connector
present?
[86A] terminal "3".
Is continuity
present?
NO
YES NO
Locate and
repair short
Repair open
to ground
wire or
on (O/GY)
connection.
wire.
Check continuity of (BN/Y) wire
between connector [10] (Black)
3
terminals "27" and "28" and
connector [86A] terminal "4".
Is continuity present?
NO
Repair
open.
fc00405_en