APRILIA MSS Mana GT ABS Service Station Manual page 135

MSS Mana GT ABS
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There is a malfunction in the handlebar gear downshift control.
Troubleshooting
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If, besides the error, the status of "Handlebar gear upshift control" indicates "Invalid data":
the instrument panel waits to detect a voltage above approximately 1 V at one of either PINS
and at the same time a voltage below approximately 1 V on the other PIN; if this does not
happen, the instrument panel sends the information to the control unit which signals this
error CASE 1) if the voltage is below 1V on both, with control not activated, it means that a
voltage below 1V, instead of battery, is detected at PIN 18 of the instrument panel; discon-
nect the gearshift control connector and read voltage at PIN 18 of the instrument panel: if
voltage is below 1 V, it means that on the blue/yellow cable there is a short circuit to ground;
if voltage is above 1 V (approximately battery voltage), replace the gear upshift control sen-
sor. CASE 2) if both voltages are below 1 V with control activated, it means that at that
moment a voltage below 1 V, instead of battery, is detected at PIN 19 of the instrument
panel; disconnect the gearshift control connector and read voltage at PIN 19 of the instru-
ment panel: if voltage is below 1 V, it means that on the black/yellow cable there is a short
circuit to ground; if the voltage is above 1 V (approximately battery voltage), replace the gear
upshift control sensor CASE 3) if both voltages are equal to battery voltage, with control not
activated, it means that there is an interruption in the circuit from instrument panel PIN 19
to PIN 30 or that PIN 30 does not have a ground connection: check the instrument panel
connector and the gearshift control connector: if they are not OK, restore; if they are OK,
check continuity on the black/yellow cable: if it is not OK, restore; if it is OK, check continuity
on the brown/black cable from gearshift control connector to PIN 30 of the instrument panel:
if it is not OK, restore; if it is OK, check continuity of the gearshift control from the gearshift
control connector (between brown 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 brown/
black cable and then replace the instrument panel. 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 18 to PIN 30 of the instrument panel: check the instrument panel
connector and the gearshift control connector: if they are not OK, restore; if they are OK,
check continuity on the blue/yellow 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 con-
nector (between brown cable and red cable) and then replace the control.
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If, besides the error, the status of "Handlebar gear downshift control" indicates "Pressed",
check the control mechanically: if it is not OK, restore; if it is OK, the gear downshift control
must be replaced.
Driving pulley electric motor
DRIVING PULLEY CONTROL ELECTRICAL MOTOR
Electrical system
ELE SYS - 135