PIAGGIO Beverly Tourer 300 i.e. Service Station Manual page 174

Injection
d.Connectors
B: Chassis ground
C: Fuel system
a. Faulty fuel pump
b.Dirty fuel filter
D: Ignition system
a.Faulty spark plug
b. Faulty coil
c. Faulty screened cap
E: Intake circuit
a.Air filter dirty
b. Dirty by-pass circuit
c. Faulty stepper motor
F: Other
a. Wrong distribution timing
b. Incorrect idle speed carburetion
c. Incorrect reset of the throttle valve position sensor
2 MIU system faults may be caused by loose connectors. Make sure that all connections have been
correctly made.
Check the connections as follows:
A check that the terminals are not bent.
B check that the connectors have been properly connected.
C check whether the malfunction can be fixed by shaking the connector slightly.
3 Check the entire system before replacing the MIUIf the fault is fixed by replacing the MIU control unit,
install the original control unit again and check if the fault occurs again.
4 For troubleshooting, use a multimeter with an internal resistance of more than 10 K W /V. Instruments
that are not suitable might damage the MIU control unit. Instruments must be used with definitions over
0.1V and 0.5 W , the precision must be higher than 2%.
1. Before fixing any part of the injection system, check to see if there are any registered faults. Do not
disconnect the battery before checking for faults.
2. The fuel supply system is pressurised at 250 kPa (2.5 BAR). Before disconnecting the fast-release
fitting of the fuel supply pipe, check that there are no naked flames. Do not smoke. Act with caution to
avoid spraying fuel to your eyes.
3. When fixing electric components, operate with the battery connected only when actually required.
4. When functional checks are performed, check that the battery voltage is over 12V.
5. Before any attempt to start the vehicle, check to make sure there is at least two litres of fuel in the
tank. Failure to respect this norm will damage the fuel pump.
INJEC - 174
Beverly Tourer 300 i.e.