Code Types - Buell 2008 XB SERIES Electrical Diagnostics Manual

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ON
A
OFF
Key On
ON
B
OFF
Key On
ON
C
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Key On

CODE TYPES

PART NUMBER
HD-44750 DIGITAL TECHNICIAN
There are two types of trouble codes: current and historic.
Certain codes are also called functional codes. Historic codes
can be read using the check engine lamp diagnostics.
All trouble codes reside in the memory of the ECM unit the
code is cleared by DIGITAL TECHNICIAN (Part No. HD-44750)
or a total of 50 trips has elapsed. A trip consists of a start and
run cycle lasting at least 30 seconds. After the 50 trip retention
period, the trouble code is automatically erased from memory
providing that no subsequent faults of the same type are
detected in that period.
NOTE
Trouble codes relating to the fuel injectors or the ignition coils
can only be fully diagnosed during actuation. For example, a
problem with the ignition coils will be considered a current fault
even after the problem is corrected, since the ECM will not
know of its resolution until after the coils are activated by
vehicle start sequence. In this manner, there may sometimes
be a false indication of the current trouble code.
Current
Current trouble codes are those which are presently disrupt
motorcycle operation. See the appropriate flow charts for
solutions.
Historic
If a particular problem happens to resolve itself, the active
status problem is dropped and it becomes a historic fault rather
than a current fault.
Historic trouble codes are stored for a length of time to assist
in the diagnosis of intermittent faults. The check engine lamp
4 Sec.
Lamp OFF: No Current or Historic DTCs
Lamp ON 8 Seconds:
Only Historic DTCs Exist
4 Sec.
4 Sec.
4 Sec.
4 Sec.
Figure 2-5. Check Engine Lamp Operation
TOOL NAME
8 Sec.
Lamp OFF
Lamp Remains ON: Current DTC*
* Historic DTCs May Also Exist
will not turn on during normal operation if only historic codes
are present.
It is important to note that historic trouble codes may also be
present whenever the system indicates the existence of a
current fault. See 2.4 CHECKING FOR TROUBLE CODES
multiple trouble codes are found.
RETRIEVING TROUBLE CODES
PART NUMBER
HD-44750 DIGITAL TECHNICIAN
The fuel injection system provides two levels of diagnostics.
The most sophisticated mode employs using a computer
based diagnostic package called DIGITAL TECHNI-
CIAN (Part No. HD-44750).
The other mode requires using the check engine lamp.
See 2.5 CHECK ENGINE LAMP DIAGNOSTICS
information.
MULTIPLE TROUBLE CODES
The throttle position and bank angle sensors are connected to
separate lines (5V REF).
Also, the ECM, fuel pump, fuel injectors and ignition coils all
receive +12 volts from the ignition relay. If this line should go
to ground the ignition fuse will open.
Always start with the trouble code having the highest priority.
Refer to Table 2-13.
CHECK ENGINE LAMP FLASHES
In addition to alerting the rider to trouble codes, the check
engine lamp will flash during operation to warn of potentially
damaging temperature. While this condition is in effect, the
ECM will reduce engine power to assist in cooling the engine
2008 Buell XB Diagnostics: Engine Management 2-7
if
TOOL NAME
for more