Triumph Tiger Explorer XR 2016, Service Manual

Page: 241 / 750

Engine Management System Actuators
Engine Management System Actuator Locations
Immobiliser System
In response to signals received from the sensors, the engine 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 actuator motor - situated at the left end of the throttle bodies. The throttle actuator motor opens and
closes the throttle plates in the throttle bodies, in response to commands from the engine ECM. The throttle
actuator motor is an integral part of the throttle bodies.
Canister purge valve - 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 engine 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 engine ECM using data received from the various
sensors in the system.
Ignition coils - plug-top coils are located in the camshaft cover. There are three coils fitted, one for each spark
plug. The engine ECM controls the point at which the coils are switched on and off. In calculating the switch-on
time, the engine 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.
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 engine ECM.
Fuel pump - located inside the fuel tank. The electric pump delivers fuel into the fuel system, via a pressure
regulator, at a constant 3.5 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 3.5 bar is available to the system as soon as the
engine is cranked. Fuel pressure is controlled by a regulator also situated inside the fuel tank.
Cooling fan - located behind the radiator. The cooling fan is turned on or off by the chassis ECM, in response to
a request sent by the engine ECM. The request from the engine ECM to turn the cooling fan on or off is sent to
the chassis ECM 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 engine ECM sends a
request to the chassis ECM to turn the cooling fan on. When the coolant temperature falls sufficiently, the engine
ECM sends a request to the chassis ECM to turn 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 on the rear 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, side stand switch) all
operate through the engine ECM.
Immobiliser System Components Location
Tiger Explorer XR Series
237 of 746
FUEL SYSTEM / ENGINE MANAGEMENT