Gilera 633721 Workshop Manual page 219

Nexus 500 euro 3
Injection
- Relay closure
- Pump rotation
- Relay opening
YES go to 31 NO go to 32
31 - The pump is fed. Perform a functional check of the pump.
32 - Check the efficiency of the pump connector.
YES go to 33 NO go to 34
33 - Replace the fuel pump.
34 - Restore
The injection CPU manages the negative of the light. The light must go off after the initial check. The
light goes on again when the CPU autodiagnosis detects a fault. When the fault disappears the light
goes back off, however, the related operating tests need to be carried out. The light can go on whether
the engine is able to run or not.
The ignition system control unit is programmed to ensure optimal carburetion while riding along streets.
The idle carburetion needs to be adjusted to compensate for the production tolerances and engine
settlement.
This adjustment is done by modifying the injector opening time with the engine running at idle.
To adjust, proceed as follows:
1 - Idle carburetion adjustment must be performed on an engine ready for precision adjustment.
Check in advance:
- spark plug
- that air filter is clean
- that throttle body is clean
- intake system for sealing
- exhaust system for sealing
- valve clearance
- fuel filter
- Fuel pressure
N.B.
IDLE SPEED IS OBTAINED BY PRE-CALIBRATING THE THROTTLE BODY AND THE ACTIVITY
OF THE STEPPER.
Characteristic
Engine idle speed
1500 ± 50 rpm
INJEC - 219