General Information; Initial Diagnostic Check - Buell X1 2002 Service Manual

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INITIAL DIAGNOSTIC CHECK

GENERAL
To locate faulty circuits or other system problems, follow the
diagnostic flow charts in this section. For a systematic
approach, always begin with
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,
descriptions of various diagnostic tools or references to other
parts of the manual where information on the location and
removal of components may be obtained.
Scanalyzer Icon
The Scanalyzer icon appears at those points in the flow chart
where the Scanalyzer may be used. If a number is printed
next to the icon, then refer to the Scanalyzer notes, which are
similar to the diagnostic notes, but are restricted to informa-
tion on the use of the Scanalyzer. All Scanalyzer notes may
be found at the end of the respective flow chart.
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,
description, type and general location.
In order to perform most diagnostic routines, a Breakout Box
and a DVOM are required. See
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 warranty claims should use the
job/time code values printed in bold text underneath the
appropriate repair.
INITIAL DIAGNOSTICS

General Information

The diagnostic check is an organized approach to identifying
a problem caused by an electronic control system malfunc-
tion. If no problems are found after completion of the diagnos-
tic check, a comparison of Scanalyzer parameters may be
used to help locate intermittents and out-of-specification sen-
sors. See Table 4-1.
2002 Buell X1: Fuel System
INITIAL DIAGNOSTICS. Read
4.7 BREAKOUT BOX.
Diagnostic Tips
If the Scanalyzer is not working properly, check operation
●
on another vehicle.
If proper Scanalyzer function is verified, check data link
●
connector [91A] for 12 volts (Terminal 4) and proper
ground (Terminal 2). See
See Figure 4-11. If Scanalyzer reads "No Response"
●
with the ignition key switch turned ON (engine stop
switch at RUN with the engine off), check serial receive
data wire for an open or short to ground between data
link Terminal 1 (Lt GN/R wire) and ECM.
Check for an open diagnostic test terminal between data
●
link Terminal 3 (V/R wire) and ECM. With ignition key
switch turned ON, transmit data line (V/R wire) should
have between 11-12 volts and receive data line (Lt GN/R
wire) between 5-6 volts.
IMPORTANT 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
1. Compare engine behavior to symptoms tables.
a. Starts hard. See Table 4-2.
b. Hesitates, stumbles, surges, misfires and/or slug-
gish performance. See
c. Engine exhaust emits black smoke or fouls plugs.
See Table 4-4.
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 4.7 BREAKOUT BOX.
All diagnostic codes are listed on
4.9
Figure 4-17.
page 4-19.
Table 4-3.
page 4-17 in Table 4-5.
4-15