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Fuel System/Engine Management
Engine Management System
System Description
The Tiger 800 and Tiger 800XC models are fitted with an
electronic
engine
management
encom passes control of both ignition and fuel delivery.
The electronic control module <ECM> draws information
from sensors positioned around the engine, cooling and
air intake systems and precisely calculates ignition
advance and fueling requirements for all engine speeds
and loads.
In addition, the system has an on-board d iagnostic
function. For additional information, see page
System Sensors
Intake air temperature sensor - situated in
•
the top of the airbox. As the density of the a i r
(and therefore the amount o f oxygen available
to ignite the fuel> changes with tem perature,
an
intake a i r temperature sensor is fitted.
Changes in air temperature <and therefore air
density) a re compensated for by adjusting the
amount of fuel injected to a level consistent
with clean combustion and low emissions.
Barometric pressure sensor
the battery. The barometric pressure sensor
measures atmospheric air pressure. With this
information, the amount of fuel injected is
adjusted to suit the prevailing conditions.
Manifold Absolute Pressure <MAP> sensor
•
situated to the front of the airbox, connected
to each of the three throttle bod ies by equal
length
tubes.
The
information to the ECM wh ich is used at
shallow throttle angles <very small throttle
openings> to provide accurate engine load
indications to the ECM. This degree of engine
load accuracy allows the ECM to make very
small adjustments to fuel and ignition which
wou ld otherwise not be possible from throttle
angle data alone.
Clutch switch - situated on the clutch lever.
•
The clutch must be pulled in for the starter
motor to operate.
Crankshaft position sensor
•
alternator cover. The crankshaft position sensor
detects movement of teeth attached to the
alternator rotor.
The toothed rotor g ives a reference point from
which
the
actual
calculated.
The
information is used by the ECM to determine
engine
speed
and
10.16
system
which
10-28.
situated below
-
MAP
sensor
provides
situated in the
-
crankshaft
position
cran kshaft
position
sensor
cran kshaft
position
SeNice Manual
Tiger 800 and Tiger 800XC
-
relation to the point where fuel is injected and
ignition of the fuel occurs.
Engine
coolant
•
situated at the rear of the cylinder head.
Coolant temperature information, received by
the ECM, is used to optimise fueling at all
engine tem peratu res and to calcu late hot and
cold start fueling requirements.
Throttle position sensor - situated at the right
•
end of the throttle body. Used to relay throttle
position
information to
opening
a ngle
determine fueling and ign ition requirements
for all th rottle positions.
Road speed sensor - situated in the upper
•
cran kcase, in front of the engine b reather. The
road speed sensor provides the ECM with data
from which
displayed on the speedometer.
Lambda sensor - situated i n the exhaust
•
header system upstream of the catalyst The
lambda sensor consta ntly feeds information to
the ECM on the content of the exhaust gases.
Based on this information, adjustments to the
air/fuel ratio are made.
Side stand switch
•
sidestand leg. If the sidestand is in the down
position, the engine will not run u nless the
transmission is in neutral.
Gear position sensor
•
crankcase,
-
sprocket cover, on the left hand side of the
engine. The gear position sensor provides the
ECM with selected gear i nformation. This is
used to prevent the engine from sta rting if the
tra nsmission
provides
information
indicator
and
instruments.
Fall detection switch
•
a nd fuse box bracket below the fuel tank The
fal l
detection
motorcycle is on its side and will cut power to
the
ECM
engine from run n i ng and the fuel pump from
delivering fuel. In the event of a fall, the switch
is reset by retu rning the bike to an upright
position and switch ing the ignition off then
back on again.
is
in
temperature
sensor
the
ECM.
Throttle
is
used
by
the
ECM
road
speed
is calcu lated and
situated at the top of the
-
situated in the upper
-
behind
the
gearbox
is
in
gear.
The
sensor
to
the
gea r
the
neutral
la m p
situated on the relay
-
switch
will
detect
immediately.
This
prevents
-
to
output
also
position
in
the
if
the
the
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