Engine Management System Description; Engine Management System Sensors - Triumph Scrambler 1200 XC Service Manual

Tyre Pressure Monitoring System.
T w ist grip position sensor
The twist grip position sensor is used to relay twist grip position information to the
engine ECM. The engine ECM uses this information to drive the throttle actuation
motor to the correct position.
T ransponder
A transponder-responder chip located in the ignition key. The transponder is activated
by a radio signal sent out by the immobiliser control module, via an antenna located
around the ignition switch. If the immobiliser control module does not receive the
correct code signal from the transponder, the immobiliser will remain active and the
engine will not start.
Engine Management System
System Description
This model is fitted with an electronic engine management system which
encompasses control of both ignition and fuel delivery. The engine 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. For additional
information, see System Diagnostics.
System Sensors
Intake air temperature sensor - situated on left hand side of the airbox. As the
density of the air changes with temperature (therefore the amount of oxygen
available to ignite the fuel), an intake air temperature sensor is fitted. Changes in
air temperature are compensated for by adjusting the amount of fuel injected to a
level consistent with clean combustion and low emissions.
Ambient air pressure sensor - situated in front of the airbox. The ambient air
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 below the fuel tank,
connected to the manifold by a length of tube. The MAP sensor provides
information to the engine 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.
Clutch switch - situated on the clutch lever. The clutch must be pulled in for the
Service Manual - Scrambler 1200 XC 386 of 640