Buell 2002 S3T, Руководство по обслуживанию, Страница: 263 / 450

4-48 2002 Buell S3T: Fuel System
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TROUBLE CODE 13 4.18
GENERAL
Oxygen (O2) Sensor
See Figure 4-42. 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 parts air
to 1 part fuel, the voltage will be approximately 0.48 V.
DIAGNOSTICS
Diagnostic Tips
The Scanalyzer or DVOM displays the signal from the O2
sensor in volts. This voltage will have an average value tend-
ing towards lean, rich or ideal value depending on operating
temperature of the engine, engine speed and throttle posi-
tion. 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). The engine must be running at part throttle
(2500 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 Figure 4-43. If the O2 sensor is
loose engine performance may be affected. This could
also show up as a slow changing O2 sensor voltage on
the Scanalyzer.
●
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 sen-
sor will read a lean condition, causing the system to go
rich.
Diagnostic Notes
1. Connect BREAKOUT BOX (Part No. HD-42682) to ECM.
See
4.7 BREAKOUT BOX .
Figure 4-42. Oxygen Sensor
Figure 4-43. Oxygen Sensor Installed
2
6762
1. Oxygen Sensor
2. Connector [137]
1
1
6932
2
3
1. Oxygen Sensor
2. Connector [137]
3. Cable Strap