PIAGGIO MP3 500 i.e. SPORT Service Station Manual page 255

MP3 500 i.e. SPORT Business_LT_ ABS-ASR_EU_USA (2015)
Injection
- Coolant temperature
- Intake air temperature
- Lambda probe
The system implements cold engine idle fuel/air mixture correction with a stepper motor 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, carburetion is controlled by modifying the injector opening time.
Fuel delivery pressure is kept constant based on the ambient pressure.
The fuel supply circuit consists of:
- Fuel pump
- Fuel filter
- Injector
- Pressure regulator
Pump, filter and regulator are placed into the fuel tank using 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 fuel pump is controlled by the RIU control unit; therefore the vehicle's safety is enhanced.
The ignition circuit consists of:
- HV coil
- HV cable
- Shielded cap
- RIU control unit
- Spark plug
The RIU control unit manages ignition with the best advance ensuring four-stroke timing (ignition only
in the compression phase) at the same time.
The RIU 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.
Obviously, this cannot happen when the rev counter signal is missing, or when the failure concerns the
control circuits:
- Fuel pump
- HV coil
- Injector
INJEC - 255