Engine Management System Information

(derived from 05 Speed Triple manual, other models may vary)

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System Description (Speed Triple 1050)


Goto Speed Triple T509 (885 cc) & 955cc   Goto Speed Triple 955i model 02 - 04 

    Goto  Daytona 675     Goto  Rocket III


The Speed Triple is fitted with an electronic engine management system which encompasses 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 diagnostic function. This ensures that, should a malfunction occur in the engine
management system, the malfunction type, and engine data at the time the malfunction occurred, are stored in the ECM
memory. This stored data can then be recovered using a special service tool which is mandatory for all Triumph dealers.
In this way, precise diagnosis of a fault can be made and the fault quickly rectified.

System Sensors (varies by year and model)

Intake air temperature sensor - situated in the top of the airbox.
As the density of the air (and therefore the amount of oxygen available to ignite the fuel) changes with temperature, an intake air temperature sensor is fitted. Changes in air temperature (and therefore air density) are compensated for by adjusting the amount of fuel injected to a level consistent with clean combustion and low emissions.

Engine coolant temperature sensor - situated at the rear of the cylinder head, on the left hand side.
Coolant temperature information, received by the ECM, is used to optimise fueling at all engine temperatures and to calculate hot and cold start fueling requirements.

Throttle position sensor - situated at the left end of the throttle body.
Used to relay throttle position information to the ECM. Throttle opening angle is used by the ECM to determine fueling and ignition requirements for all throttle positions.

Barometric pressure Sensor - situated on the left hand side, at the front of the rear mudguard beneath the seat.
The barometric pressure sensor measures atmospheric air pressure. With this information, the amount of fuel per injection is adjusted to suit the prevailing conditions.

Manifold Absolute Pressure (MAP) sensor situated to the left side of the airbox, connected to each of the three throttle bodies by equal length tubes.
The MAP sensor provides information to the ECM which 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 would otherwise not be possible from throttle angle data alone.

Road speed sensor
situated in the upper crankcase, on the left hand side, above the sprocket cover.
The road speed sensor provides the ECM with data from which road speed is calculated and displayed on the
speedometer. A vehicle speed limitation device also receives
information from the road speed sensor.

Clutch switch situated on the clutch lever.
The clutch must be pulled in for the starter motor to operate.

Crankshaft position sensor situated in the crankcase, near the alternator cover.
The crankshaft position sensor detects movement of a toothed wheel attached to the alternator rotor.
The toothed wheel gives a reference point from which the actual crankshaft position is calculated.
The crankshaft position sensor information is used by the ECM to determine engine speed and crankshaft position in relation to the point where fuel is injected and ignition of the fuel occurs.

Lambda sensor situated in the exhaust header system upstream of the catalyst.
The lambda sensor constantly feeds information to the ECM on the content of the exhaust gases.

Based on this information, adjustments to air/fuel ratio are made.

Side stand switch situated at the top of the sidestand leg.  
If the sidestand is in the down position, the engine will not run unless the transmission is in neutral.

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System Actuators  (varies by year and model)

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 cam/lever 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 frorn 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 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.


In this system, the starter lockout system (clutch switch, neutral  switch, sidestand switch) all operate through the engine management ECM.


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