APRILIA Tuono V4 1100 Factory Service Station Manual page 234

Electrical system
the Yellow/Red cable: if there is continuity with the ground, restore the wiring harness; if ok,
turn the key to OFF and perform the VEHICLE connector and engine-vehicle wiring harness
connector check: if not ok, restore; if ok, check the continuity of the Yellow/Pink cable be-
tween the switch connector and the VEHICLE connector PIN C7 and PIN 78: if not ok, restore
the wiring harness; if ok, replace the Marelli control unit.
•
Indication on the diagnostic tool always RUN: disconnect the connector and check with the
switch in STOP of there is continuity between the two cables of the switch: if there is, replace
the switch, if there is no continuity it means that, with the key ON, the Yellow/Pink cable
(between the switch and PIN C7 of the engine-vehicle wiring harness connector or between
the latter and PIN 78 of the control unit connector) is in short circuit to positive: restore the
wiring harness.
Butterfly valve in exhaust
Function
Used to reduce the noise at the exhaust. The ex-
haust valve is controlled as follows:
•
Engine off: fully closed 0%
•
With engine on: the exhaust valve as-
sumes different aperture values de-
pending on engine speed and load and
on the gear selected. Above 6000 rpm,
the valve is permanently open in all
gears except neutral.
•
With the motorcycle stationary and the
gearbox in neutral, the valve remains
closed up to 7000 rpm.
Operation / Operating principle
The system consists of a throttle valve with return
spring on the exhaust. The valve is closed by 2
cables operated by an electric motor which is elec-
trically connected to the instrument cluster. The
logic and the motor control, however, reside in the
Marelli injection control unit that dialogues with the
instrument cluster via the CAN.
Level in electrical circuit diagram:
Exhaust valve
Location:
ELE SYS - 234
Tuono V4 1100 Factory