APRILIA MSS Mana GT ABS Service Station Manual page 132

Electrical system
from PIN A6 to PIN C5 or that PIN C5 does not have a ground connection: check the trans-
mission ECU connector and the gearshift control connector: if they are not OK, restore; if
they are OK, check continuity on the black/purple cable: if it is not OK, restore; if it is OK,
check continuity on the blue/black cable from the gearshift control connector to PIN C5: if it
is not OK, restore; if it is OK, check continuity of the gearshift control from the gearshift
control connector (between red cable and blue cable): if it is not OK, replace the control; if
it is OK, check, with key set to KEY ON, that there is no ground connection in the blue/black
cable and then replace the transmission ECU. CASE 4) if both voltages are above 1 V
(approximately battery voltage), with control activated, it means that there is an interruption
on the circuit from PIN C4 to PIN C5: check the transmission ECU connector and the gear-
shift control connector: if they are not OK, restore; if they are OK, check continuity on the
blue/purple cable: if it is not OK, restore; if it is OK, check, with control activated, that there
is not continuity on the gearshift control from the gearshift control connector (between red
cable and brown cable) and then replace the control.
•
If the control is blocked: check the control mechanically: if it is not OK, restore; if it is OK, it
means that on the diagnosis instrument the status of "Pedal gear downshift control" indicates
"Pressed": the gear downshift control must be replaced.
Gearshift lever on the handlebar
GEARSHIFT CONTROL ON HANDLEBAR
Function
To tell the transmission ECU that the driver wishes
to change the variator transmission ratio (if trans-
mission in manual mode).
Operation / operating principle
Either control (+) or (-) is made up of a deviator
with both outputs electrically connected to the in-
strument panel: at the same time, the instrument
panel sends the requested command to the trans-
mission ECU, via CAN line.
Level in wiring diagram: transmission manage-
ment
Position:
•
handlebar gearshift control on vehicle:
left light switch
•
connector: behind front headlight, un-
der the instrument panel
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MSS Mana GT ABS