APRILIA 854239, Service Station Manual

Page: 55 / 216

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open circuit, shorted to positive, shorted to negative.
Troubleshooting
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Disconnect the connector from the Stepper motor and check the electrical specifications: if
NOT OK, replace the Stepper motor; if OK, check the Stepper motor connectors and the
Walbro control unit connector. If they are not OK, restore the connectors; if OK, check if
there is continuity between PIN B1 of the control unit connector and PIN A of the Stepper
motor connector. if NOT OK, restore; if OK, check if there is continuity between PIN D1 of
the control unit connector and PIN C of the Stepper motor connector, if NOT OK, restore, if
OK check if there is continuity between PIN A1 of the control unit connector and PIN D of
the Stepper motor connector. If NOT OK, restore; if OK, check if there is continuity between
PIN C1 of the control unit connector and PIN B of the Stepper motor connector, if NOT OK,
restore; if OK check that there is no short circuit to ground or to positive of one of the 4 cables
of the idle motor (white/black, white/brown, white/green, white/blue). If NOT OK, restore; if
OK, replace the WALBRO control unit
Fuses
CAUTION
NEVER ATTEMPT TO REPAIR FAULTY FUSES. NEVER USE A FUSE OF A RATING OTHER THAN
SPECIFIED. THIS COULD DAMAGE THE ELECTRICAL SYSTEM OR CAUSE A SHORT CIRCUIT,
WITH THE RISK OF FIRE.
CAUTION
IF A FUSE BLOWS OUT FREQUENTLY, THAT MAY BE DUE TO A SHORT CIRCUIT OR OVER-
LOAD. IF THIS OCCURS, CONTACT AN Official Aprilia Dealer.
Checking the fuse is necessary whenever an electrical component fails to operate or is malfunctioning
or when the engine does not start.
To check:
•
Remove the air filter.
•
Remove the fuse and check if the fila-
ment is broken.
•
Before replacing the fuse, find and
solve, if possible, the reason that
caused the problem.
•
If the fuse is damaged, replace it with
one of the same amperage.
•
Refit the air filter.
NOTE
MXV 450
Electrical system
ELE SYS - 55