APRILIA RST mille Futura 2001 Service Manual page 144

FUEL SYSTEM
Throttle position sensor (4)
Location: on the throttle body (5).
This sensor is a potentiometer, and for greater precision
its position is determined by comparing the output
voltage with the input voltage (rated 5 V).
Once the throttle is open, the output voltage from the
sensor increases in a linear fashion. The throttle is the
main driving control, which regulates the volume of air
admitted to the engine. The throttle angle is therefore
used to assess the load and determine whether the rider
wishes to accelerate or decelerate.
Engine temperature sensor (6)
The engine temperature sensor is a thermistor with a
negative temperature coefficient. This means that its
resistance decreases as the temperature increases. This
sensor is positioned to provide a precise indication of the
engine running temperature. The EMS compensates for
the various engine operating properties within different
engine temperature ranges. For example, a cold engine
will need a different amount of fuel for start-up compared
to a warm engine.
Air temperature sensor
Location: in the left air duct (7).
Air temperature affects the density of the incoming air,
thereby altering the actual load on the engine and thus
the amount of fuel needed. Compensation is necessary
to limit the risk of explosion caused by high air intake
temperatures.
4
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00
5
6
RST mille
USA
4
Release 00/2002 - 03