Triumph Speed Triple Service Manual page 160

System Actuators
In response to signals received from the sensors, the
ECM controls and directs messages to a series of
electronic and electro-mechanical actuators. The
function and location of the actuators is given below.
Throttle stepper motor
-
situated at the right
end of the throttle bodies. The throttle stepper
actuates a camllever which causes variations in
the closed throttle position. Although used
primarily to ensure target idle speed is
maintained, it also increases throttle opening
when the engine is cold.
Canister purge valve (California models only)
-
situated in the vapour return line between the
carbon canister and the throttle bodies. The
purge valve controls the return of vapour which
has been stored in the carbon canister during the
period when the engine is switched off. The
valve is 'pulsed' by the ECM to give control over
the rate at which the canister is purged.
Injectors
-
located in the cylinder head. The
engine is fitted with three injectors. The spray
pattern of the injectors is fixed but the length of
time each injector can remain open is variable
according to operating conditions. The duration
of each injection is calculated by the ECM using
data received from the various sensors in the
system.
Ignition coils
-
plug-top coils are located in the
cam cover. There are three coils fitted, one for
each spark plug. The ECM controls the-point at
which the coils are switched on and off. In
calculating the switch-on time, the ECM allows
sufficient time for the coils to charge to a level
where a spark can be produced. The coils are
switched off at the point of ignition, the timing of
which is optimised for good engine performance.
Fall detection switch
-
situated next to the
barometric pressure sensor, beneath the seat.
The fall detection switch will detect if the
motorcycle is on its side and will cut power to the
ECM immediately. This prevents the engine from
running and the fuel pump from delivering fuel.
In the event of a fall, the switch is reset by
returning the bike to an upright position and
switching the ignition off then back on again.
Main power relay
-
situated under the seat.
When the ignition is switched on, the main power
relay is powered up to provide a stable voltage
supply for the ECM.
Fuel pump
-
located inside the fuel tank. The
electric pump delivers fuel into the fuel system,
via a pressure regulator, at a constant
3
bar
pressure. The pump is run continuously when
the engine is operating and is also run briefly
when the ignition is first switched on to ensure
that
3
bar is available to the system as soon as
c
the engine is cranked. Fuel pressure is
controlled by a regulator also situated inside the
fuel tank.
* Cooling fan
-
located behind the radiator. The
ECM controls switching on and off of the cooling
fan in response to a signal received from the
coolant temperature sensor. When the coolant
temperature rises to a level where the cooling
effect of natural airflow is insufficient, the cooling
fan is turned on by the ECM. When the coolant
temperature falls sufficiently, the ECM turns the
cooling fan off. The fan only becomes
operational when the engine is running. It will
not operate at any other time.
*
Secondary air injection solenoid
-
located in
front of the airbox. The secondary air injection
solenoid controls airflow through the secondary
air injection system.
(
Note:
*
In this system, the starter lockout system
(clutch switch, neutral switch, sidestand
switch) all operate through the engine
management ECM.
Service Manual
-
Speed Triple