APRILIA MSS Mana GT ABS Service Station Manual page 131

MSS Mana GT ABS
A7: 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 the same as the battery voltage, with control
not activated, it means that there is an interruption in the circuit from PIN A7 to PIN C5 or
that PIN C5 does not have a ground connection: check the transmission ECU 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 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 green
cable and black 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 A3 to PIN
C5: check the transmission ECU 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 of the gearshift
control from the gearshift control connector (between black cable and yellow 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 the "Pedal gear upshift control" statues on the diagnosis instrument indicates
"Pressed": the gear upshift control must be replaced.
Pedal gear downshift control - Code 900E - signal not valid for logic reasons/ blocked control.
Error cause
•
If the electric signal is not valid due to a logic reason: the control unit detects no voltage or
the same voltage as the other at PIN C4 or PIN A6. If the control is blocked: the control has
been in the pressed position for too long.
Troubleshooting
•
If the electric signal is not valid due to a logic reason: CASE 1) if both voltages are below 1
V, with control not activated, it means that a voltage below 1 V, instead of battery, is detected
at PIN C4; disconnect the gearshift control connector and read voltage at PIN C4: if voltage
is equal to 1 V or below, it means that on the blue/purple cable there is a short circuit to
ground; if voltage is above 1 V, replace the gear upshift control sensor. 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 A6; disconnect the gearshift control connector and
read voltage at PIN A6: if voltage is below 1 V, it means that on the black/purple 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 above 1 V (approximately
battery voltage), with control not activated, it means that there is an interruption in the circuit
Electrical system
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