Buell 2003XB9S Service Manual page 354

HOME
TROUBLE CODE 13
GENERAL
Oxygen (O2) Sensor
See Figure 4-36. The oxygen (O2) sensor provides a signal to
the ECM which indicates whether the engine is running rich
or lean.
A low voltage signal (<0.41 V) indicates the engine is
running lean.
A high voltage signal (>0.56 V) indicates the engine is
running rich.
When the air/fuel mixture is ideal, approximately 14.7 parts
air to 1 part fuel, the voltage will be approximately 0.48 V.
DIAGNOSTICS
Diagnostic Tips
The DVOM displays the signal from the O2 sensor in volts.
This voltage will have an average value tending towards lean,
rich or ideal value depending on operating temperature of the
engine, engine speed and throttle position. An open/short to
voltage or short to ground in the V/GY wire will cause the
engine to run rich (short to ground) or lean (short to voltage)
until fault is detected. Once fault is detected, vehicle will run
in open loop. The engine must be running below 5000 RPM
for the ECM to detect an O2 sensor failure.
Check for the following conditions:
Poor connection. Inspect the ECM harness connector
[11], fuel injector connectors [84, 85] and O2 sensor con-
nector wiring for backed out terminals, improper mating,
broken locks, improperly formed or damaged terminals,
poor terminal-to-wire connection and damaged harness.
Dirty/stuck open injectors. The motorcycle may run
lean (dirty/clogged injectors) or rich (stuck open injec-
tors) if there is an injector problem. This could also cause
poor fuel economy and performance.
Loose O2 sensor. See
loose engine performance may be affected. This could
also show up as a slow changing O2 sensor voltage.
Loose/leaking exhaust. This can cause a poor ground
connection for sensor or allow fresh air into the exhaust
system. If fresh air enters exhaust system, the O2 sensor
will read a lean condition, causing the system to go rich.
Diagnostic Notes
1. Connect BREAKOUT BOX (Part No. HD-42682) to ECM.
See 4.6 BREAKOUT BOX.
Figure 4-37. If the O2 sensor is
b1111x7x
2
1
1. Oxygen sensor
2. Connector [137]
Figure 4-36. Oxygen Sensor
8467
Figure 4-37. Oxygen Sensor (shock absorber removed)
2003 Buell XB9S: Fuel System
4.17
4-45