Buell 2002 S3T Service Manual page 221

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CODE TYPES
There are three types of trouble codes: current, historic or
functional. If a trouble code is stored, it can be read using
either a Scanalyzer or check engine lamp diagnostics.
All trouble codes reside in the memory of the ECM until the
code is cleared by use of the Scanalyzer or a total of 50 trips
has elasped. A trip consists of a start and run cycle, the 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.
Current
Current trouble codes are those which 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 current fault.
Historic trouble codes are stored for a length of time to assist
in the diagnosis of intermittent faults. The check engine lamp
will not indicate the existence of only historic trouble codes.
It is important to note that historic trouble codes may also be
present whenever the system indicates the existence of a
current fault. See MULTIPLE TROUBLE CODES
trouble codes are found.
Functional
A functional trouble code indicates an internal problem with
the ECM (trouble codes 52 through 55) or with the camshaft
sensor/timing (trouble code 56).
4-6 2002 Buell S3T: Fuel System
RETRIEVING TROUBLE
CODES
The fuel injection system provides two levels of diagnostics.
●
The most sophisticated mode employs a portable diag-
nostic tool called a Scanalyzer. This device plugs into the
motorcycle wiring harness. It facilitates the diagnosis of
system problems through a direct interface with the
ECM. See
●
The second mode requires using the check engine lamp.
See 4.6 CHECK ENGINE LAMP DIAGNOSTICS
more information.
MULTIPLE TROUBLE CODES
The TP and CMP sensors are all connected to the same ref-
erence line (5v REF). If this line goes to ground or open, mul-
tiple trouble codes (codes 11 and 56) may be set.
Also, the ECM, fuel pump, fuel injectors, bank angle sensor
and ignition coil 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 lowest numeri-
cal value. See list of fault conditions on page 4-17
5.).
CHECK ENGINE LAMP BLINKS
if multiple
In addition to alerting the rider to trouble codes, the check
engine lamp will blink during operation to warn of potentially
damaging engine operating temperatures. If the key is in the
on position and the check engine lamp is blinking, the engine
is at a potentially damaging temperature. While this condition
is in effect, the ECM will reduce engine power to assist in
cooling the engine down to a safe operating temperature. The
check engine lamp will blink until the engine has cooled to a
safe operating temperature.
4.5 SCANALYZER.
for
(Table 4-