MOTO GUZZI NEVADA 750, Service Station Manual

Page: 51 / 128

•
If the circuit is open, shorted to negative: voltage equal to zero has been detected at PIN 20
of the control unit connector
Troubleshooting
•
shorted to positive: disconnect the coil connector, set the key to ON, activate the coil with
Navigator and check voltage at connector PIN 2: if there is voltage, restore the cable har-
ness; if voltage = 0, replace the coil
•
if the circuit is open, shorted to negative: check the coil connector and the Marelli control
unit connector. If not OK, restore; if everything is OK, check cable continuity between the
two cable terminals. If there is no continuity, restore the cable harness; if there is cable
continuity, with key set to ON, check the cable earth insulation (from coil connector or control
unit connector). If not OK, restore the cable harness.
Right coil:
The auxiliary injection relay (No. 12 in the wiring diagram, placed under saddle, second relay starting
from the front; CHECK, however, the identification of the relay with the colour of the cables) is energised
for 5 seconds and the orange/blue cable of the coil is closed to ground for 2 ms per second. Disconnect
the 4-way connector of the fuel pump to be able to hear the relay and injector activation. The continuity
of the wiring is necessary for correct activation: no error indications are displayed in case of lack of
activation.
Right coil - shorted to positive / open circuit, shorted to negative.
Error cause
•
If shorted to positive: excessive voltage has been detected at PIN 14 of the control unit
connector.
•
If the circuit is open, shorted to negative: voltage equal to zero has been detected at PIN 14
of the control unit connector
Troubleshooting
•
shorted to positive: disconnect the coil connector, set the key to ON, activate the coil with
Navigator and check voltage at connector PIN 2: if there is voltage, restore the cable har-
ness; if voltage = 0, replace the coil.
•
if the circuit is open, shorted to negative: check the coil connector and the Marelli control
unit connector. If not OK, restore; if everything is OK, check cable continuity between the
two cable terminals. If there is no continuity, restore the cable harness; if there is cable
continuity, with key set to ON, check the cable earth insulation (from coil connector or control
unit connector). If not OK, restore the cable harness.
NEVADA 750
Electrical system
ELE SYS - 51