VESPA GTV 250 i.e. 2008 Service Station Manual page 157

Vespa GTV 250 i.e.
C
OMPONENT
Specification
1 Instrument panel
2 Throttle body and injection
electronic control unit
(MIU)
3 Diagnostics socket con-
nector
4 Fuel pump
5 Water temperature sensor
6 Fuel injector
7 H.V. coil
8 Engine speed sensor
9 Lambda probe
10 Injection load relay
11 Battery
12 Electric fan relay
Precautions
1 A MIU failure is more likely to be due to the connections than to the components.
Before troubleshooting the MIU system, carry out the following checks:
A: Power supply
a. Battery voltage
b. Blown fuse
c. Relays
d. Connectors
B: Frame ground connection
C: Fuel system
a. Faulty fuel pump
b. Dirty fuel filter
D: Ignition system
a. Faulty spark plug
b. Faulty coil
c. Faulty shielded cap
E: Intake circuit
a. Air filter dirty
b. b. Dirty by-pass circuit
c. Faulty stepper motor
F: Others
a. Wrong timing system
b. Wrong idle mixture
c. Incorrect reset of the throttle valve position sensor
T
RANSPOSITION
Desc./Quantity
12V - 12 Ah
Troubleshooting tips
Injection
INJEC - 157