APRILIA SCARABEO 500 - 2008, Service Station Manual

Page: 232 / 324

10. Do not invert the polarity when fitting the battery.
11. In order to prevent damages, disconnect and reconnect the MIU system connectors only if actually
required. Before restoring the connections, check that they are perfectly dry.
12. When carrying out electric inspections, do not force the tester probes into the connectors. Do not
take measurements not specifically required by the manual.
13. At the end of every check carried out with the diagnostic tester, protect the system connector with
the specific cap. Failure to observe this rule can damage the MIU electronic control unit.
14. Before reconnecting the fast-release fittings of the power supply system, check that the terminals
are perfectly clean.
Troubleshooting tips
1 A failure of the MIU system is more likely to be due to the connections rather than the components.
Before searching the MIU system for failures, check:
A : Power supply
a. Battery voltage
b. If a fuse is blown
c. Remote controls
d. Connectors
B : Chassis ground connection
C : Fuel supply
a. If the fuel pump is broken
b. If the fuel filter is dirty
D : Ignition system
a. If the spark plug is faulty
b. If the coil is broken
c. If the shielded cap is broken
E : Intake circuit
a. If the air filter is dirty
b. If the by-pass circuit is clogged
c. If the Stepper motor is failing
F : Others
a. If the timing system is not correctly adjusted
b. If the idle carburetion is not correct
c. If the throttle valve position sensor is not correctly reset
2 MIU system failure may be caused by loose connectors. Make sure that all connections are properly
implemented.
Check the connectors as follows:
A check that the terminals are not bent.
B check that the connectors have been properly connected.
Injection
SCARABEO 500
INJEC - 232