Engine Stops At Idle; Engine Does Not Rev Down - Gilera Nexus 500 Workshop Manual

Injection
Possible Cause
Correctness of the parameters

Engine stops at idle

ENGINE DOES NOT HOLD IDLING/ IDLING IS UNSTABLE/ IDLING TOO LOW
Possible Cause
Presence of faults detected by the self diagnosis
Ignition efficiency
Correctness of the parameters
Intake system cleaning
Intake system sealing (infiltrations)
Fuel feed (low pressure)
Analysis of exhaust fumes before the catalytic con-
verter

Engine does not rev down

ENGINE DOES NOT RETURN TO THE IDLING SPEED/IDLING SPEED TOO HIGH
Possible Cause
Presence of faults detected by the self diagnosis
Ignition efficiency
INJEC - 16
Operation
Injector capacity (low)
Injector sealing (poor)
Coolant temperature
Stepper throttle valve position intake air tempera-
ture (steps and actual opening)
Cleaning of the auxiliary air pipe and throttle valve;
air filter efficiency
Operation
Pump relay
H.V. coil
Injector
revolution timing sensor
Air temperature
Coolant temperature.
Atmospheric pressure
Spark plug
Ignition timing
Throttle valve position sensor
Stepper
Coolant temperature sensor
Intake air temperature sensor
Air filter
Diffuser and throttle valve
Additional air pipe and Stepper
Intake manifold - head
Throttle body - manifold
Intake sleeve
Filter box
Fuel pump
Pressure regulator
Fuel filter
Injector capacity
Trimmer value adjustment (CO % adjustment)
Operation
Pump relay
H.V. coil
Injector
revolution timing sensor
Air temperature
Coolant temperature.
Atmospheric pressure
Ignition timing
Nexus 500