Cagiva Navigator, Workshop Manual

Page: 60 / 407

C.16
INJECTION - AIR INTAKE SYSTEM
SENSORS
INTAKE AIR SUCTION SENSOR (IAP SENSOR)
The intake air pressure sensor is situated on the right hand side of
the air filter compartment.
The sensor senses the suction of air in the intake air tube (spring
type) of the butterfly body and this pressure is converted into volt-
age and sent to the ECM.
The basic time of injection of the fuel (volume) is determined ac-
cording to the signal voltage (outgoing voltage).
The voltage increases when the air pressure of the intake air is high.
THROTTLE POSITION SENSOR (TP SENSOR)
The throttle position sensor is situated on the N° 2 carburettor. To
get access to this component, it is necessary to remove the left hand
fuel tank as described in Chapter B.
This sensor is a variable resistance sensor and senses the angle of
opening of the throttle. In the sensor, the battery voltage is changed
to the relative voltage of the position of the throttle and is then sent
to the ECM. The basic time of injection of the fuel (volume) is deter-
mined according to the signal voltage (outgoing voltage).
The voltage increases when the throttle is increasingly opened.
Outgoing voltage
(V)
Intake air pressure
(mmHg)
Low
(low suction) High
(high suction)
Low
High
Outgoing voltage
(V)
Low
High
Partially open
Fully opened
Throttle
opening (in grades)