Gilera Nexus 500, Workshop Manual, Page: 201 / 406

In any case, check the CO value again.
EMS injection system
The injection system is of the integrated injection and ignition type.
Injection is indirect in the manifold through electronic injector.
Injection and ignition are timed on the 4-stroke cycle using a tonne wheel pivoted on the camshaft control
and a reluctance variation sensor.
Combustion and ignition are managed on the basis of the engine speed and the throttle valve opening.
Further corrections are made according to the following parameters:
- Coolant temperature.
- Temperature of the intake air
- Ambient pressure
The system implements an idle feeding correction with cold engine through 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, fuel preparation is managed by modifying the injector opening time.
The fuel feed pressure is held steady in accordance with the environmental pressure.
The feed 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 two pipes provided with quick couplings. This allows obtaining a continuous
circulation, thereby avoiding the risk of fuel boiling. The pressure regulator is situated at the end of the
circuit.
The fuel pump is controlled by the EMS control unit; this ensures the scooter's safety
The ignition circuit consists of:
- H.V. coil
- H.V. cable
- Screened cap
- EMS control unit
- Spark plug
The EMS control unit manages the ignition with optimum timing, ensuring the timing on the 4-stroke
cycle (ignition only during compression).
The EMS injection/ignition system manages the engine function according to a preset program.
Should any input signals fail, an acceptable working order of the engine is ensured to allow the user to
reach a service station.
Nexus 500
Injection
INJEC - 9