4-12 2007 Buell Lightning: Fuel System
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INITIAL DIAGNOSTIC CHECK 4.8
GENERAL
To locate faulty circuits or other system problems, follow the
diagnostic flow charts in this section. For a systematic
approach, always begin with INITIAL DIAGNOSTICS. Read
the general information and then work your way through the
flow chart box by box.
Diagnostic Notes
If a numbered circle appears adjacent to a flow chart box,
then more information is offered in the diagnostic notes. Many
diagnostic notes contain supplemental information, descrip-
tions of various diagnostic tools or references to other parts
of the manual where information on the location and removal
of components may be obtained.
Circuit Diagram/Wire Harness
Connector Table
When working through a flow chart, refer to the illustrations,
the associated circuit diagram and the wire harness connec-
tor table as necessary. The wire harness connector table for
each circuit diagram identifies the connector number, descrip-
tion, type and general location.
In order to perform most diagnostic routines, a Breakout Box
and a DVOM are required. See 4.6 BREAKOUT BOX.
To perform the circuit checks with any degree of efficiency, a
familiarity with the various wire connectors is also necessary.
Job/Time Code Values
Dealership technicians filing out warranty claims should use
the job/time code values in Digital Technician.
INITIAL DIAGNOSTICS
General Information
The diagnostic check is an organized approach to identifying
a problem caused by an electronic control system malfunc-
tion.
NOTE
The engine may be started and run when the trouble codes
are received using a jumper wire on Pins 1 and 2 of the data
link connector. However, if the jumper wire is removed with
the engine running, the check engine lamp will continue to
flash trouble codes. To stop check engine lamp from flashing
codes, turn engine stop switch OFF.
Diagnostic Notes
The reference numbers below correlate with the circled num-
bers on the diagnostic check flow charts. See Diagnostic
Check (Part 1 of 2).
1. Compare engine behavior to tables.
a. Starts hard. Refer to Table 4-4.
b. Hesitates, stumbles, surges, misfires and/or slug-
gish performance. Refer to Table 4-5.
c. Engine exhaust emits black smoke or fouls plugs.
Refer to Table 4-6.
2. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404), black socket probes and patch cord.
3. Connect BREAKOUT BOX (Part No. HD-42682) to ECM.
See 4.6 BREAKOUT BOX.
All diagnostic codes are listed in Table 4-7.
Table 4-4. Engine Starts Hard
CAUSE SOLUTION
Engine temperature circuit 4.18 TROUBLE CODE 14.
Improper fuel pressure 4.13 FUEL PRESSURE
TEST.
Spark plugs and/or wires 4.15 MISFIRE.
Battery discharged See charging system trouble-
shooting in Section 7.
Cam position sensor 4.29 TROUBLE CODE 56.
Manifold leak Spray water around induction
module seals with engine
idling. If RPM changes,
change seals.
Ignition coil 4.15 MISFIRE.
Leaky injectors Test fuel injectors. See 4.42
THROTTLE BODY.
Valve sticking See Section 3.
Table 4-5. Engine Performance Problems
CAUSE SOLUTION
Engine temperature circuit 4.18 TROUBLE CODE 14.
Improper ignition timing 1.17 IGNITION TIMING.
Cam position sensor circuit 4.29 TROUBLE CODE 56.
Spark plugs and/or wires 4.15 MISFIRE.
Improper fuel pressure 4.13 FUEL PRESSURE
TEST.
Improper throttle position
sensor adjustment
Calibrate sensor using DIGI-
TAL TECHNICIAN (Part No.
HD-44750).
Manifold leak See 4.43 INTAKE LEAK
TEST.
Throttle plates not opening
fully
1.15 THROTTLE CABLE
AND IDLE SPEED
ADJUSTMENT.
EVAP hose disconnected
from induction module (CA)
Connect.
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