Troubleshooting Procedure; Engine Does Not Start - VESPA 633844 IT Service Manual

Injection
1
2
3 Water temperature sensor
4
5
6
7
8
9
10
11
12
13
14
15 Injection load remote control
16 Starter remote control
17
18
19
20
21
22
23
24
25
26
27 Diagnostics socket connector

Troubleshooting procedure

Engine does not start

Possible Cause
Immobiliser enabling signal
Presence of faults detected by the self diagnosis
Fuel supply
Power to the spark plug
Parameter reliability
INJEC - 8
EMS SYSTEM (E
LECTRONIC
Specification
Battery
Engine rpm sensor
Immobilizer aerial
Stop button
Fuse
Fuse
Key switch contacts
Fuse
Engine stop switch
Fuse
Fuse
Fuse
Starter button
Electric fan starter
Starter motor
Electric fan
Fuel pump
HV coil
Fuel injector
Lambda sensor
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"WARNING" light
Immobilizer LED
ENGINE DOES NOT START IF ONLY PULLED
Vespa GTV 250 i.e.
M S
ANAGEMENT YSTEM
Desc./Quantity
12V - 12 Ah
Operation
System not encoded
System not efficient, repair according to the indi-
cations of the self-diagnosis
Pump relay
HV coil
Injector
revolution timing sensor
Fuel in the tank
Fuel pump activation
Fuel pressure (low)
Injector capacity (low)
Shielded spark-plug cap HV coil (secondary insu-
lation)
Coolant temperature
Distribution timing - injection ignition
)
30 A
3 A
10 A
7.5 A
15A
7.5 A
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