Injection system
This vehicle is fitted with an integrated injection and ignition system.
Injection is indirect in the manifold through an electro-injector.
The injection and ignition are timed on the four-stroke cycle by means of a tone wheel keyed on to the
crankshaft (24-2 teeth) and pick-up sensor.
Combustion and ignition are managed on the basis of engine revs and throttle valve opening. Further
corrections are made according to the following parameters:
- Engine temperature
- Intake air temperature
- Lambda probe
The system implements cold engine idle fuel/air mixture correction with an adjustment device on a by-
pass circuit of the throttle valve. The control unit manages the Stepper motor and the injector opening
time, thereby ensuring the idle steadiness and the proper combustion.
In all conditions of use, mixture preparation is managed by modifying the injector opening time.
The fuel system pressure is kept constant in relation to ambient pressure.
The
fuel system circuit
consists of:
- Fuel pump
- Fuel filter
- Injector
- Pressure regulator
The pump, the filter and the regulator are placed inside the fuel tank on a single support.
The injector is connected by a pipe with fast-release fittings. The pressure regulator is located at the
beginning of the circuit.
The petrol pump is controlled by the injection control unit; this ensures safety of the vehicle.
The
ignition circuit
consists of:
- H.V. coil
- H.V. cable.
- Shielded cap
- Injection ECU
- Spark plug
The injection control unit manages ignition with the best advance ensuring four-stroke timing (ignition
only in the compression phase) at the same time.
The injection/ignition system manages the engine function according to a pre-set program.
Should any input signals fail, an acceptable working order of the engine is ensured to allow the user to
reach a service station.
Of course, this cannot happen when the rpm-timing signal is missing, or when the failure involves the
control circuits:
Vespa Primavera125 - 150 i.e. 3Valvole (2013)
Injection
INJEC - 183
Summary of Contents for 150
Page 1: ...SERVICE STATION MANUAL 1Q000118 EN Vespa Primavera125 150 i e 3Valvole 2013 ...
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Page 55: ...Vespa Primavera125 150 i e 3Valvole 2013 Troubleshooting TROUBL 55 ...
Page 56: ...INDEX OF TOPICS ELECTRICAL SYSTEM ELE SYS ...
Page 117: ...INDEX OF TOPICS ENGINE FROM VEHICLE ENG VE ...
Page 123: ...INDEX OF TOPICS ENGINE ENG ...
Page 182: ...INDEX OF TOPICS INJECTION INJEC ...
Page 203: ...INDEX OF TOPICS SUSPENSIONS SUSP ...
Page 222: ...INDEX OF TOPICS BRAKING SYSTEM BRAK SYS ...
Page 229: ...INDEX OF TOPICS CHASSIS CHAS ...
Page 244: ...INDEX OF TOPICS PRE DELIVERY PRE DE ...
Page 249: ...Transmission 10 53 124 136 Turn indicators 79 Tyres 11 V Vehicle 8 118 119 ...