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NEVADA 750
Troubleshooting
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
Troubleshooting
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•
If the circuit is open, shorted to negative: voltage equal to zero has been detected at PIN 20
of the control unit connector
•
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.
•
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
•
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.
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